[sword-svn] r2487 - in trunk: include src/utilfuns
chrislit at crosswire.org
chrislit at crosswire.org
Tue Dec 8 00:18:00 MST 2009
Author: chrislit
Date: 2009-12-08 00:18:00 -0700 (Tue, 08 Dec 2009)
New Revision: 2487
Removed:
trunk/src/utilfuns/regcomp.c
trunk/src/utilfuns/regex_internal.c
trunk/src/utilfuns/regex_internal.h
trunk/src/utilfuns/regexec.c
Modified:
trunk/include/regex.h
trunk/src/utilfuns/regex.c
Log:
reverting GNU regex to old version
Modified: trunk/include/regex.h
===================================================================
--- trunk/include/regex.h 2009-12-07 04:02:43 UTC (rev 2486)
+++ trunk/include/regex.h 2009-12-08 07:18:00 UTC (rev 2487)
@@ -1,63 +1,72 @@
/* Definitions for data structures and routines for the regular
- expression library.
- Copyright (C) 1985,1989-93,1995-98,2000,2001,2002,2003,2005,2006,2008
- Free Software Foundation, Inc.
- This file is part of the GNU C Library.
+ expression library, version 0.12.
+ Copyright (C) 1985,89,90,91,92,93,95,96,97 Free Software Foundation, Inc.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
+ the C library, however. The master source lives in /gd/gnu/lib.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
+NOTE: The canonical source of this file is maintained with the
+GNU C Library. Bugs can be reported to bug-glibc at prep.ai.mit.edu.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+This program is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software Foundation,
+Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
#ifndef _REGEX_H
#define _REGEX_H 1
-#include <sys/types.h>
-
/* Allow the use in C++ code. */
#ifdef __cplusplus
-extern "C" {
+extern "C"
+{
#endif
+/* POSIX says that <sys/types.h> must be included (by the caller) before
+ <regex.h>. */
+
+#if !defined (_POSIX_C_SOURCE) && !defined (_POSIX_SOURCE) && defined (VMS)
+/* VMS doesn't have `size_t' in <sys/types.h>, even though POSIX says it
+ should be there. */
+#include <stddef.h>
+#endif
+
/* The following two types have to be signed and unsigned integer type
wide enough to hold a value of a pointer. For most ANSI compilers
ptrdiff_t and size_t should be likely OK. Still size of these two
types is 2 for Microsoft C. Ugh... */
-typedef long int s_reg_t;
-typedef unsigned long int active_reg_t;
+ typedef long int s_reg_t;
+ typedef unsigned long int active_reg_t;
/* The following bits are used to determine the regexp syntax we
recognize. The set/not-set meanings are chosen so that Emacs syntax
remains the value 0. The bits are given in alphabetical order, and
the definitions shifted by one from the previous bit; thus, when we
add or remove a bit, only one other definition need change. */
-typedef unsigned long int reg_syntax_t;
+ typedef unsigned long int reg_syntax_t;
-#ifdef __USE_GNU
/* If this bit is not set, then \ inside a bracket expression is literal.
If set, then such a \ quotes the following character. */
-# define RE_BACKSLASH_ESCAPE_IN_LISTS ((unsigned long int) 1)
+#define RE_BACKSLASH_ESCAPE_IN_LISTS ((unsigned long int) 1)
/* If this bit is not set, then + and ? are operators, and \+ and \? are
literals.
If set, then \+ and \? are operators and + and ? are literals. */
-# define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1)
+#define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1)
/* If this bit is set, then character classes are supported. They are:
[:alpha:], [:upper:], [:lower:], [:digit:], [:alnum:], [:xdigit:],
[:space:], [:print:], [:punct:], [:graph:], and [:cntrl:].
If not set, then character classes are not supported. */
-# define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1)
+#define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1)
/* If this bit is set, then ^ and $ are always anchors (outside bracket
expressions, of course).
@@ -71,7 +80,7 @@
POSIX draft 11.2 says that * etc. in leading positions is undefined.
We already implemented a previous draft which made those constructs
invalid, though, so we haven't changed the code back. */
-# define RE_CONTEXT_INDEP_ANCHORS (RE_CHAR_CLASSES << 1)
+#define RE_CONTEXT_INDEP_ANCHORS (RE_CHAR_CLASSES << 1)
/* If this bit is set, then special characters are always special
regardless of where they are in the pattern.
@@ -79,71 +88,71 @@
some contexts; otherwise they are ordinary. Specifically,
* + ? and intervals are only special when not after the beginning,
open-group, or alternation operator. */
-# define RE_CONTEXT_INDEP_OPS (RE_CONTEXT_INDEP_ANCHORS << 1)
+#define RE_CONTEXT_INDEP_OPS (RE_CONTEXT_INDEP_ANCHORS << 1)
/* If this bit is set, then *, +, ?, and { cannot be first in an re or
immediately after an alternation or begin-group operator. */
-# define RE_CONTEXT_INVALID_OPS (RE_CONTEXT_INDEP_OPS << 1)
+#define RE_CONTEXT_INVALID_OPS (RE_CONTEXT_INDEP_OPS << 1)
/* If this bit is set, then . matches newline.
If not set, then it doesn't. */
-# define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1)
+#define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1)
/* If this bit is set, then . doesn't match NUL.
If not set, then it does. */
-# define RE_DOT_NOT_NULL (RE_DOT_NEWLINE << 1)
+#define RE_DOT_NOT_NULL (RE_DOT_NEWLINE << 1)
/* If this bit is set, nonmatching lists [^...] do not match newline.
If not set, they do. */
-# define RE_HAT_LISTS_NOT_NEWLINE (RE_DOT_NOT_NULL << 1)
+#define RE_HAT_LISTS_NOT_NEWLINE (RE_DOT_NOT_NULL << 1)
/* If this bit is set, either \{...\} or {...} defines an
interval, depending on RE_NO_BK_BRACES.
If not set, \{, \}, {, and } are literals. */
-# define RE_INTERVALS (RE_HAT_LISTS_NOT_NEWLINE << 1)
+#define RE_INTERVALS (RE_HAT_LISTS_NOT_NEWLINE << 1)
/* If this bit is set, +, ? and | aren't recognized as operators.
If not set, they are. */
-# define RE_LIMITED_OPS (RE_INTERVALS << 1)
+#define RE_LIMITED_OPS (RE_INTERVALS << 1)
/* If this bit is set, newline is an alternation operator.
If not set, newline is literal. */
-# define RE_NEWLINE_ALT (RE_LIMITED_OPS << 1)
+#define RE_NEWLINE_ALT (RE_LIMITED_OPS << 1)
/* If this bit is set, then `{...}' defines an interval, and \{ and \}
are literals.
If not set, then `\{...\}' defines an interval. */
-# define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1)
+#define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1)
/* If this bit is set, (...) defines a group, and \( and \) are literals.
If not set, \(...\) defines a group, and ( and ) are literals. */
-# define RE_NO_BK_PARENS (RE_NO_BK_BRACES << 1)
+#define RE_NO_BK_PARENS (RE_NO_BK_BRACES << 1)
/* If this bit is set, then \<digit> matches <digit>.
If not set, then \<digit> is a back-reference. */
-# define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1)
+#define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1)
/* If this bit is set, then | is an alternation operator, and \| is literal.
If not set, then \| is an alternation operator, and | is literal. */
-# define RE_NO_BK_VBAR (RE_NO_BK_REFS << 1)
+#define RE_NO_BK_VBAR (RE_NO_BK_REFS << 1)
/* If this bit is set, then an ending range point collating higher
than the starting range point, as in [z-a], is invalid.
If not set, then when ending range point collates higher than the
starting range point, the range is ignored. */
-# define RE_NO_EMPTY_RANGES (RE_NO_BK_VBAR << 1)
+#define RE_NO_EMPTY_RANGES (RE_NO_BK_VBAR << 1)
/* If this bit is set, then an unmatched ) is ordinary.
If not set, then an unmatched ) is invalid. */
-# define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_NO_EMPTY_RANGES << 1)
+#define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_NO_EMPTY_RANGES << 1)
/* If this bit is set, succeed as soon as we match the whole pattern,
without further backtracking. */
-# define RE_NO_POSIX_BACKTRACKING (RE_UNMATCHED_RIGHT_PAREN_ORD << 1)
+#define RE_NO_POSIX_BACKTRACKING (RE_UNMATCHED_RIGHT_PAREN_ORD << 1)
/* If this bit is set, do not process the GNU regex operators.
If not set, then the GNU regex operators are recognized. */
-# define RE_NO_GNU_OPS (RE_NO_POSIX_BACKTRACKING << 1)
+#define RE_NO_GNU_OPS (RE_NO_POSIX_BACKTRACKING << 1)
/* If this bit is set, turn on internal regex debugging.
If not set, and debugging was on, turn it off.
@@ -151,38 +160,14 @@
We define this bit always, so that all that's needed to turn on
debugging is to recompile regex.c; the calling code can always have
this bit set, and it won't affect anything in the normal case. */
-# define RE_DEBUG (RE_NO_GNU_OPS << 1)
+#define RE_DEBUG (RE_NO_GNU_OPS << 1)
-/* If this bit is set, a syntactically invalid interval is treated as
- a string of ordinary characters. For example, the ERE 'a{1' is
- treated as 'a\{1'. */
-# define RE_INVALID_INTERVAL_ORD (RE_DEBUG << 1)
-
-/* If this bit is set, then ignore case when matching.
- If not set, then case is significant. */
-# define RE_ICASE (RE_INVALID_INTERVAL_ORD << 1)
-
-/* This bit is used internally like RE_CONTEXT_INDEP_ANCHORS but only
- for ^, because it is difficult to scan the regex backwards to find
- whether ^ should be special. */
-# define RE_CARET_ANCHORS_HERE (RE_ICASE << 1)
-
-/* If this bit is set, then \{ cannot be first in an bre or
- immediately after an alternation or begin-group operator. */
-# define RE_CONTEXT_INVALID_DUP (RE_CARET_ANCHORS_HERE << 1)
-
-/* If this bit is set, then no_sub will be set to 1 during
- re_compile_pattern. */
-# define RE_NO_SUB (RE_CONTEXT_INVALID_DUP << 1)
-#endif
-
/* This global variable defines the particular regexp syntax to use (for
some interfaces). When a regexp is compiled, the syntax used is
stored in the pattern buffer, so changing this does not affect
already-compiled regexps. */
-extern reg_syntax_t re_syntax_options;
+ extern reg_syntax_t re_syntax_options;
-#ifdef __USE_GNU
/* Define combinations of the above bits for the standard possibilities.
(The [[[ comments delimit what gets put into the Texinfo file, so
don't delete them!) */
@@ -198,10 +183,9 @@
#define RE_SYNTAX_GNU_AWK \
((RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DEBUG) \
- & ~(RE_DOT_NOT_NULL | RE_INTERVALS | RE_CONTEXT_INDEP_OPS \
- | RE_CONTEXT_INVALID_OPS ))
+ & ~(RE_DOT_NOT_NULL | RE_INTERVALS | RE_CONTEXT_INDEP_OPS))
-#define RE_SYNTAX_POSIX_AWK \
+#define RE_SYNTAX_POSIX_AWK \
(RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS \
| RE_INTERVALS | RE_NO_GNU_OPS)
@@ -217,8 +201,7 @@
| RE_NO_BK_VBAR)
#define RE_SYNTAX_POSIX_EGREP \
- (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES \
- | RE_INVALID_INTERVAL_ORD)
+ (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES)
/* P1003.2/D11.2, section 4.20.7.1, lines 5078ff. */
#define RE_SYNTAX_ED RE_SYNTAX_POSIX_BASIC
@@ -231,7 +214,7 @@
| RE_INTERVALS | RE_NO_EMPTY_RANGES)
#define RE_SYNTAX_POSIX_BASIC \
- (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM | RE_CONTEXT_INVALID_DUP)
+ (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM)
/* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes
RE_LIMITED_OPS, i.e., \? \+ \| are not recognized. Actually, this
@@ -240,13 +223,13 @@
(_RE_SYNTAX_POSIX_COMMON | RE_LIMITED_OPS)
#define RE_SYNTAX_POSIX_EXTENDED \
- (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \
- | RE_CONTEXT_INDEP_OPS | RE_NO_BK_BRACES \
- | RE_NO_BK_PARENS | RE_NO_BK_VBAR \
- | RE_CONTEXT_INVALID_OPS | RE_UNMATCHED_RIGHT_PAREN_ORD)
+ (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \
+ | RE_CONTEXT_INDEP_OPS | RE_NO_BK_BRACES \
+ | RE_NO_BK_PARENS | RE_NO_BK_VBAR \
+ | RE_UNMATCHED_RIGHT_PAREN_ORD)
-/* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INDEP_OPS is
- removed and RE_NO_BK_REFS is added. */
+/* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INVALID_OPS
+ replaces RE_CONTEXT_INDEP_OPS and RE_NO_BK_REFS is added. */
#define RE_SYNTAX_POSIX_MINIMAL_EXTENDED \
(_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \
| RE_CONTEXT_INVALID_OPS | RE_NO_BK_BRACES \
@@ -257,12 +240,11 @@
/* Maximum number of duplicates an interval can allow. Some systems
(erroneously) define this in other header files, but we want our
value, so remove any previous define. */
-# ifdef RE_DUP_MAX
-# undef RE_DUP_MAX
-# endif
-/* If sizeof(int) == 2, then ((1 << 15) - 1) overflows. */
-# define RE_DUP_MAX (0x7fff)
+#ifdef RE_DUP_MAX
+#undef RE_DUP_MAX
#endif
+/* If sizeof(int) == 2, then ((1 << 15) - 1) overflows. */
+#define RE_DUP_MAX (0x7fff)
/* POSIX `cflags' bits (i.e., information for `regcomp'). */
@@ -297,42 +279,35 @@
/* Like REG_NOTBOL, except for the end-of-line. */
#define REG_NOTEOL (1 << 1)
-/* Use PMATCH[0] to delimit the start and end of the search in the
- buffer. */
-#define REG_STARTEND (1 << 2)
-
/* If any error codes are removed, changed, or added, update the
`re_error_msg' table in regex.c. */
-typedef enum
-{
-#if defined _XOPEN_SOURCE || defined __USE_XOPEN2K
- REG_ENOSYS = -1, /* This will never happen for this implementation. */
-#endif
+ typedef enum
+ {
+ REG_NOERROR = 0, /* Success. */
+ REG_NOMATCH, /* Didn't find a match (for regexec). */
- REG_NOERROR = 0, /* Success. */
- REG_NOMATCH, /* Didn't find a match (for regexec). */
+ /* POSIX regcomp return error codes. (In the order listed in the
+ standard.) */
+ REG_BADPAT, /* Invalid pattern. */
+ REG_ECOLLATE, /* Not implemented. */
+ REG_ECTYPE, /* Invalid character class name. */
+ REG_EESCAPE, /* Trailing backslash. */
+ REG_ESUBREG, /* Invalid back reference. */
+ REG_EBRACK, /* Unmatched left bracket. */
+ REG_EPAREN, /* Parenthesis imbalance. */
+ REG_EBRACE, /* Unmatched \{. */
+ REG_BADBR, /* Invalid contents of \{\}. */
+ REG_ERANGE, /* Invalid range end. */
+ REG_ESPACE, /* Ran out of memory. */
+ REG_BADRPT, /* No preceding re for repetition op. */
- /* POSIX regcomp return error codes. (In the order listed in the
- standard.) */
- REG_BADPAT, /* Invalid pattern. */
- REG_ECOLLATE, /* Inalid collating element. */
- REG_ECTYPE, /* Invalid character class name. */
- REG_EESCAPE, /* Trailing backslash. */
- REG_ESUBREG, /* Invalid back reference. */
- REG_EBRACK, /* Unmatched left bracket. */
- REG_EPAREN, /* Parenthesis imbalance. */
- REG_EBRACE, /* Unmatched \{. */
- REG_BADBR, /* Invalid contents of \{\}. */
- REG_ERANGE, /* Invalid range end. */
- REG_ESPACE, /* Ran out of memory. */
- REG_BADRPT, /* No preceding re for repetition op. */
-
- /* Error codes we've added. */
- REG_EEND, /* Premature end. */
- REG_ESIZE, /* Compiled pattern bigger than 2^16 bytes. */
- REG_ERPAREN /* Unmatched ) or \); not returned from regcomp. */
-} reg_errcode_t;
+ /* Error codes we've added. */
+ REG_EEND, /* Premature end. */
+ REG_ESIZE, /* Compiled pattern bigger than 2^16 bytes. */
+ REG_ERPAREN /* Unmatched ) or \); not returned from regcomp. */
+ }
+ reg_errcode_t;
/* This data structure represents a compiled pattern. Before calling
the pattern compiler, the fields `buffer', `allocated', `fastmap',
@@ -341,137 +316,148 @@
private to the regex routines. */
#ifndef RE_TRANSLATE_TYPE
-# define __RE_TRANSLATE_TYPE unsigned char *
-# ifdef __USE_GNU
-# define RE_TRANSLATE_TYPE __RE_TRANSLATE_TYPE
-# endif
+#define RE_TRANSLATE_TYPE char *
#endif
-#ifdef __USE_GNU
-# define __REPB_PREFIX(name) name
-#else
-# define __REPB_PREFIX(name) __##name
-#endif
+ struct re_pattern_buffer
+ {
+/* [[[begin pattern_buffer]]] */
+ /* Space that holds the compiled pattern. It is declared as
+ `unsigned char *' because its elements are
+ sometimes used as array indexes. */
+ unsigned char *buffer;
-struct re_pattern_buffer
-{
- /* Space that holds the compiled pattern. It is declared as
- `unsigned char *' because its elements are sometimes used as
- array indexes. */
- unsigned char *__REPB_PREFIX(buffer);
+ /* Number of bytes to which `buffer' points. */
+ unsigned long int allocated;
- /* Number of bytes to which `buffer' points. */
- unsigned long int __REPB_PREFIX(allocated);
+ /* Number of bytes actually used in `buffer'. */
+ unsigned long int used;
- /* Number of bytes actually used in `buffer'. */
- unsigned long int __REPB_PREFIX(used);
+ /* Syntax setting with which the pattern was compiled. */
+ reg_syntax_t syntax;
- /* Syntax setting with which the pattern was compiled. */
- reg_syntax_t __REPB_PREFIX(syntax);
+ /* Pointer to a fastmap, if any, otherwise zero. re_search uses
+ the fastmap, if there is one, to skip over impossible
+ starting points for matches. */
+ char *fastmap;
- /* Pointer to a fastmap, if any, otherwise zero. re_search uses the
- fastmap, if there is one, to skip over impossible starting points
- for matches. */
- char *__REPB_PREFIX(fastmap);
+ /* Either a translate table to apply to all characters before
+ comparing them, or zero for no translation. The translation
+ is applied to a pattern when it is compiled and to a string
+ when it is matched. */
+ RE_TRANSLATE_TYPE translate;
- /* Either a translate table to apply to all characters before
- comparing them, or zero for no translation. The translation is
- applied to a pattern when it is compiled and to a string when it
- is matched. */
- __RE_TRANSLATE_TYPE __REPB_PREFIX(translate);
+ /* Number of subexpressions found by the compiler. */
+ size_t re_nsub;
- /* Number of subexpressions found by the compiler. */
- size_t re_nsub;
+ /* Zero if this pattern cannot match the empty string, one else.
+ Well, in truth it's used only in `re_search_2', to see
+ whether or not we should use the fastmap, so we don't set
+ this absolutely perfectly; see `re_compile_fastmap' (the
+ `duplicate' case). */
+ unsigned can_be_null:1;
- /* Zero if this pattern cannot match the empty string, one else.
- Well, in truth it's used only in `re_search_2', to see whether or
- not we should use the fastmap, so we don't set this absolutely
- perfectly; see `re_compile_fastmap' (the `duplicate' case). */
- unsigned __REPB_PREFIX(can_be_null) : 1;
+ /* If REGS_UNALLOCATED, allocate space in the `regs' structure
+ for `max (RE_NREGS, re_nsub + 1)' groups.
+ If REGS_REALLOCATE, reallocate space if necessary.
+ If REGS_FIXED, use what's there. */
+#define REGS_UNALLOCATED 0
+#define REGS_REALLOCATE 1
+#define REGS_FIXED 2
+ unsigned regs_allocated:2;
- /* If REGS_UNALLOCATED, allocate space in the `regs' structure
- for `max (RE_NREGS, re_nsub + 1)' groups.
- If REGS_REALLOCATE, reallocate space if necessary.
- If REGS_FIXED, use what's there. */
-#ifdef __USE_GNU
-# define REGS_UNALLOCATED 0
-# define REGS_REALLOCATE 1
-# define REGS_FIXED 2
-#endif
- unsigned __REPB_PREFIX(regs_allocated) : 2;
+ /* Set to zero when `regex_compile' compiles a pattern; set to one
+ by `re_compile_fastmap' if it updates the fastmap. */
+ unsigned fastmap_accurate:1;
- /* Set to zero when `regex_compile' compiles a pattern; set to one
- by `re_compile_fastmap' if it updates the fastmap. */
- unsigned __REPB_PREFIX(fastmap_accurate) : 1;
+ /* If set, `re_match_2' does not return information about
+ subexpressions. */
+ unsigned no_sub:1;
- /* If set, `re_match_2' does not return information about
- subexpressions. */
- unsigned __REPB_PREFIX(no_sub) : 1;
+ /* If set, a beginning-of-line anchor doesn't match at the
+ beginning of the string. */
+ unsigned not_bol:1;
- /* If set, a beginning-of-line anchor doesn't match at the beginning
- of the string. */
- unsigned __REPB_PREFIX(not_bol) : 1;
+ /* Similarly for an end-of-line anchor. */
+ unsigned not_eol:1;
- /* Similarly for an end-of-line anchor. */
- unsigned __REPB_PREFIX(not_eol) : 1;
+ /* If true, an anchor at a newline matches. */
+ unsigned newline_anchor:1;
- /* If true, an anchor at a newline matches. */
- unsigned __REPB_PREFIX(newline_anchor) : 1;
-};
+/* [[[end pattern_buffer]]] */
+ };
-typedef struct re_pattern_buffer regex_t;
+ typedef struct re_pattern_buffer regex_t;
/* Type for byte offsets within the string. POSIX mandates this. */
-typedef int regoff_t;
+ typedef int regoff_t;
-#ifdef __USE_GNU
/* This is the structure we store register match data in. See
regex.texinfo for a full description of what registers match. */
-struct re_registers
-{
- unsigned num_regs;
- regoff_t *start;
- regoff_t *end;
-};
+ struct re_registers
+ {
+ unsigned num_regs;
+ regoff_t *start;
+ regoff_t *end;
+ };
/* If `regs_allocated' is REGS_UNALLOCATED in the pattern buffer,
`re_match_2' returns information about at least this many registers
the first time a `regs' structure is passed. */
-# ifndef RE_NREGS
-# define RE_NREGS 30
-# endif
+#ifndef RE_NREGS
+#define RE_NREGS 30
#endif
/* POSIX specification for registers. Aside from the different names than
`re_registers', POSIX uses an array of structures, instead of a
structure of arrays. */
-typedef struct
-{
- regoff_t rm_so; /* Byte offset from string's start to substring's start. */
- regoff_t rm_eo; /* Byte offset from string's start to substring's end. */
-} regmatch_t;
+ typedef struct
+ {
+ regoff_t rm_so; /* Byte offset from string's start to substring's start. */
+ regoff_t rm_eo; /* Byte offset from string's start to substring's end. */
+ }
+ regmatch_t;
/* Declarations for routines. */
-#ifdef __USE_GNU
+/* To avoid duplicating every routine declaration -- once with a
+ prototype (if we are ANSI), and once without (if we aren't) -- we
+ use the following macro to declare argument types. This
+ unfortunately clutters up the declarations a bit, but I think it's
+ worth it. */
+#ifndef __STDC__
+#define __STDC__ 1
+#endif
+#if __STDC__
+
+#define _RE_ARGS(args) args
+
+#else /* not __STDC__ */
+
+#define _RE_ARGS(args) ()
+
+#endif /* not __STDC__ */
+
/* Sets the current default syntax to SYNTAX, and return the old syntax.
You can also simply assign to the `re_syntax_options' variable. */
-extern reg_syntax_t re_set_syntax (reg_syntax_t __syntax);
+ extern reg_syntax_t re_set_syntax _RE_ARGS ((reg_syntax_t syntax));
/* Compile the regular expression PATTERN, with length LENGTH
and syntax given by the global `re_syntax_options', into the buffer
BUFFER. Return NULL if successful, and an error string if not. */
-extern const char *re_compile_pattern (const char *__pattern, size_t __length,
- struct re_pattern_buffer *__buffer);
+ extern const char *re_compile_pattern
+ _RE_ARGS ((const char *pattern, size_t length,
+ struct re_pattern_buffer * buffer));
/* Compile a fastmap for the compiled pattern in BUFFER; used to
accelerate searches. Return 0 if successful and -2 if was an
internal error. */
-extern int re_compile_fastmap (struct re_pattern_buffer *__buffer);
+ extern int re_compile_fastmap
+ _RE_ARGS ((struct re_pattern_buffer * buffer));
/* Search in the string STRING (with length LENGTH) for the pattern
@@ -479,30 +465,31 @@
characters. Return the starting position of the match, -1 for no
match, or -2 for an internal error. Also return register
information in REGS (if REGS and BUFFER->no_sub are nonzero). */
-extern int re_search (struct re_pattern_buffer *__buffer, const char *__string,
- int __length, int __start, int __range,
- struct re_registers *__regs);
+ extern int re_search
+ _RE_ARGS ((struct re_pattern_buffer * buffer, const char *string,
+ int length, int start, int range, struct re_registers * regs));
/* Like `re_search', but search in the concatenation of STRING1 and
STRING2. Also, stop searching at index START + STOP. */
-extern int re_search_2 (struct re_pattern_buffer *__buffer,
- const char *__string1, int __length1,
- const char *__string2, int __length2, int __start,
- int __range, struct re_registers *__regs, int __stop);
+ extern int re_search_2
+ _RE_ARGS ((struct re_pattern_buffer * buffer, const char *string1,
+ int length1, const char *string2, int length2,
+ int start, int range, struct re_registers * regs, int stop));
/* Like `re_search', but return how many characters in STRING the regexp
in BUFFER matched, starting at position START. */
-extern int re_match (struct re_pattern_buffer *__buffer, const char *__string,
- int __length, int __start, struct re_registers *__regs);
+ extern int re_match
+ _RE_ARGS ((struct re_pattern_buffer * buffer, const char *string,
+ int length, int start, struct re_registers * regs));
/* Relates to `re_match' as `re_search_2' relates to `re_search'. */
-extern int re_match_2 (struct re_pattern_buffer *__buffer,
- const char *__string1, int __length1,
- const char *__string2, int __length2, int __start,
- struct re_registers *__regs, int __stop);
+ extern int re_match_2
+ _RE_ARGS ((struct re_pattern_buffer * buffer, const char *string1,
+ int length1, const char *string2, int length2,
+ int start, struct re_registers * regs, int stop));
/* Set REGS to hold NUM_REGS registers, storing them in STARTS and
@@ -517,59 +504,42 @@
Unless this function is called, the first search or match using
PATTERN_BUFFER will allocate its own register data, without
freeing the old data. */
-extern void re_set_registers (struct re_pattern_buffer *__buffer,
- struct re_registers *__regs,
- unsigned int __num_regs,
- regoff_t *__starts, regoff_t *__ends);
-#endif /* Use GNU */
+ extern void re_set_registers
+ _RE_ARGS ((struct re_pattern_buffer * buffer, struct re_registers * regs,
+ unsigned num_regs, regoff_t * starts, regoff_t * ends));
-#if defined _REGEX_RE_COMP || (defined _LIBC && defined __USE_BSD)
-# ifndef _CRAY
+#ifdef _REGEX_RE_COMP
+#ifndef _CRAY
/* 4.2 bsd compatibility. */
-extern char *re_comp (const char *);
-extern int re_exec (const char *);
-# endif
+ extern char *re_comp _RE_ARGS ((const char *));
+ extern int re_exec _RE_ARGS ((const char *));
#endif
-
-/* GCC 2.95 and later have "__restrict"; C99 compilers have
- "restrict", and "configure" may have defined "restrict". */
-#ifndef __restrict
-# if ! (2 < __GNUC__ || (2 == __GNUC__ && 95 <= __GNUC_MINOR__))
-# if defined restrict || 199901L <= __STDC_VERSION__
-# define __restrict restrict
-# else
-# define __restrict
-# endif
-# endif
#endif
-/* gcc 3.1 and up support the [restrict] syntax. */
-#ifndef __restrict_arr
-# if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)) \
- && !defined __GNUG__
-# define __restrict_arr __restrict
-# else
-# define __restrict_arr
-# endif
-#endif
/* POSIX compatibility. */
-extern int regcomp (regex_t *__restrict __preg,
- const char *__restrict __pattern,
- int __cflags);
+ extern int regcomp
+ _RE_ARGS ((regex_t * preg, const char *pattern, int cflags));
+ extern int regexec
+ _RE_ARGS (
+ (const regex_t * preg, const char *string, size_t nmatch,
+ regmatch_t pmatch[], int eflags));
+ extern size_t regerror
+ _RE_ARGS (
+ (int errcode, const regex_t * preg, char *errbuf,
+ size_t errbuf_size));
+ extern void regfree _RE_ARGS ((regex_t * preg));
-extern int regexec (const regex_t *__restrict __preg,
- const char *__restrict __string, size_t __nmatch,
- regmatch_t __pmatch[__restrict_arr],
- int __eflags);
-extern size_t regerror (int __errcode, const regex_t *__restrict __preg,
- char *__restrict __errbuf, size_t __errbuf_size);
-
-extern void regfree (regex_t *__preg);
-
-
#ifdef __cplusplus
}
-#endif /* C++ */
+#endif /* C++ */
-#endif /* regex.h */
+#endif /* regex.h */
+
+/*
+Local variables:
+make-backup-files: t
+version-control: t
+trim-versions-without-asking: nil
+End:
+*/
Deleted: trunk/src/utilfuns/regcomp.c
===================================================================
--- trunk/src/utilfuns/regcomp.c 2009-12-07 04:02:43 UTC (rev 2486)
+++ trunk/src/utilfuns/regcomp.c 2009-12-08 07:18:00 UTC (rev 2487)
@@ -1,3818 +0,0 @@
-/* Extended regular expression matching and search library.
- Copyright (C) 2002,2003,2004,2005,2006,2007,2009
- Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Isamu Hasegawa <isamu at yamato.ibm.com>.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-static reg_errcode_t re_compile_internal (regex_t *preg, const char * pattern,
- size_t length, reg_syntax_t syntax);
-static void re_compile_fastmap_iter (regex_t *bufp,
- const re_dfastate_t *init_state,
- char *fastmap);
-static reg_errcode_t init_dfa (re_dfa_t *dfa, size_t pat_len);
-#ifdef RE_ENABLE_I18N
-static void free_charset (re_charset_t *cset);
-#endif /* RE_ENABLE_I18N */
-static void free_workarea_compile (regex_t *preg);
-static reg_errcode_t create_initial_state (re_dfa_t *dfa);
-#ifdef RE_ENABLE_I18N
-static void optimize_utf8 (re_dfa_t *dfa);
-#endif
-static reg_errcode_t analyze (regex_t *preg);
-static reg_errcode_t preorder (bin_tree_t *root,
- reg_errcode_t (fn (void *, bin_tree_t *)),
- void *extra);
-static reg_errcode_t postorder (bin_tree_t *root,
- reg_errcode_t (fn (void *, bin_tree_t *)),
- void *extra);
-static reg_errcode_t optimize_subexps (void *extra, bin_tree_t *node);
-static reg_errcode_t lower_subexps (void *extra, bin_tree_t *node);
-static bin_tree_t *lower_subexp (reg_errcode_t *err, regex_t *preg,
- bin_tree_t *node);
-static reg_errcode_t calc_first (void *extra, bin_tree_t *node);
-static reg_errcode_t calc_next (void *extra, bin_tree_t *node);
-static reg_errcode_t link_nfa_nodes (void *extra, bin_tree_t *node);
-static int duplicate_node (re_dfa_t *dfa, int org_idx, unsigned int constraint);
-static int search_duplicated_node (const re_dfa_t *dfa, int org_node,
- unsigned int constraint);
-static reg_errcode_t calc_eclosure (re_dfa_t *dfa);
-static reg_errcode_t calc_eclosure_iter (re_node_set *new_set, re_dfa_t *dfa,
- int node, int root);
-static reg_errcode_t calc_inveclosure (re_dfa_t *dfa);
-static int fetch_number (re_string_t *input, re_token_t *token,
- reg_syntax_t syntax);
-static int peek_token (re_token_t *token, re_string_t *input,
- reg_syntax_t syntax) internal_function;
-static bin_tree_t *parse (re_string_t *regexp, regex_t *preg,
- reg_syntax_t syntax, reg_errcode_t *err);
-static bin_tree_t *parse_reg_exp (re_string_t *regexp, regex_t *preg,
- re_token_t *token, reg_syntax_t syntax,
- int nest, reg_errcode_t *err);
-static bin_tree_t *parse_branch (re_string_t *regexp, regex_t *preg,
- re_token_t *token, reg_syntax_t syntax,
- int nest, reg_errcode_t *err);
-static bin_tree_t *parse_expression (re_string_t *regexp, regex_t *preg,
- re_token_t *token, reg_syntax_t syntax,
- int nest, reg_errcode_t *err);
-static bin_tree_t *parse_sub_exp (re_string_t *regexp, regex_t *preg,
- re_token_t *token, reg_syntax_t syntax,
- int nest, reg_errcode_t *err);
-static bin_tree_t *parse_dup_op (bin_tree_t *dup_elem, re_string_t *regexp,
- re_dfa_t *dfa, re_token_t *token,
- reg_syntax_t syntax, reg_errcode_t *err);
-static bin_tree_t *parse_bracket_exp (re_string_t *regexp, re_dfa_t *dfa,
- re_token_t *token, reg_syntax_t syntax,
- reg_errcode_t *err);
-static reg_errcode_t parse_bracket_element (bracket_elem_t *elem,
- re_string_t *regexp,
- re_token_t *token, int token_len,
- re_dfa_t *dfa,
- reg_syntax_t syntax,
- int accept_hyphen);
-static reg_errcode_t parse_bracket_symbol (bracket_elem_t *elem,
- re_string_t *regexp,
- re_token_t *token);
-#ifdef RE_ENABLE_I18N
-static reg_errcode_t build_equiv_class (bitset_t sbcset,
- re_charset_t *mbcset,
- int *equiv_class_alloc,
- const unsigned char *name);
-static reg_errcode_t build_charclass (RE_TRANSLATE_TYPE trans,
- bitset_t sbcset,
- re_charset_t *mbcset,
- int *char_class_alloc,
- const unsigned char *class_name,
- reg_syntax_t syntax);
-#else /* not RE_ENABLE_I18N */
-static reg_errcode_t build_equiv_class (bitset_t sbcset,
- const unsigned char *name);
-static reg_errcode_t build_charclass (RE_TRANSLATE_TYPE trans,
- bitset_t sbcset,
- const unsigned char *class_name,
- reg_syntax_t syntax);
-#endif /* not RE_ENABLE_I18N */
-static bin_tree_t *build_charclass_op (re_dfa_t *dfa,
- RE_TRANSLATE_TYPE trans,
- const unsigned char *class_name,
- const unsigned char *extra,
- int non_match, reg_errcode_t *err);
-static bin_tree_t *create_tree (re_dfa_t *dfa,
- bin_tree_t *left, bin_tree_t *right,
- re_token_type_t type);
-static bin_tree_t *create_token_tree (re_dfa_t *dfa,
- bin_tree_t *left, bin_tree_t *right,
- const re_token_t *token);
-static bin_tree_t *duplicate_tree (const bin_tree_t *src, re_dfa_t *dfa);
-static void free_token (re_token_t *node);
-static reg_errcode_t free_tree (void *extra, bin_tree_t *node);
-static reg_errcode_t mark_opt_subexp (void *extra, bin_tree_t *node);
-
-/* This table gives an error message for each of the error codes listed
- in regex.h. Obviously the order here has to be same as there.
- POSIX doesn't require that we do anything for REG_NOERROR,
- but why not be nice? */
-
-const char __re_error_msgid[] attribute_hidden =
- {
-#define REG_NOERROR_IDX 0
- gettext_noop ("Success") /* REG_NOERROR */
- "\0"
-#define REG_NOMATCH_IDX (REG_NOERROR_IDX + sizeof "Success")
- gettext_noop ("No match") /* REG_NOMATCH */
- "\0"
-#define REG_BADPAT_IDX (REG_NOMATCH_IDX + sizeof "No match")
- gettext_noop ("Invalid regular expression") /* REG_BADPAT */
- "\0"
-#define REG_ECOLLATE_IDX (REG_BADPAT_IDX + sizeof "Invalid regular expression")
- gettext_noop ("Invalid collation character") /* REG_ECOLLATE */
- "\0"
-#define REG_ECTYPE_IDX (REG_ECOLLATE_IDX + sizeof "Invalid collation character")
- gettext_noop ("Invalid character class name") /* REG_ECTYPE */
- "\0"
-#define REG_EESCAPE_IDX (REG_ECTYPE_IDX + sizeof "Invalid character class name")
- gettext_noop ("Trailing backslash") /* REG_EESCAPE */
- "\0"
-#define REG_ESUBREG_IDX (REG_EESCAPE_IDX + sizeof "Trailing backslash")
- gettext_noop ("Invalid back reference") /* REG_ESUBREG */
- "\0"
-#define REG_EBRACK_IDX (REG_ESUBREG_IDX + sizeof "Invalid back reference")
- gettext_noop ("Unmatched [ or [^") /* REG_EBRACK */
- "\0"
-#define REG_EPAREN_IDX (REG_EBRACK_IDX + sizeof "Unmatched [ or [^")
- gettext_noop ("Unmatched ( or \\(") /* REG_EPAREN */
- "\0"
-#define REG_EBRACE_IDX (REG_EPAREN_IDX + sizeof "Unmatched ( or \\(")
- gettext_noop ("Unmatched \\{") /* REG_EBRACE */
- "\0"
-#define REG_BADBR_IDX (REG_EBRACE_IDX + sizeof "Unmatched \\{")
- gettext_noop ("Invalid content of \\{\\}") /* REG_BADBR */
- "\0"
-#define REG_ERANGE_IDX (REG_BADBR_IDX + sizeof "Invalid content of \\{\\}")
- gettext_noop ("Invalid range end") /* REG_ERANGE */
- "\0"
-#define REG_ESPACE_IDX (REG_ERANGE_IDX + sizeof "Invalid range end")
- gettext_noop ("Memory exhausted") /* REG_ESPACE */
- "\0"
-#define REG_BADRPT_IDX (REG_ESPACE_IDX + sizeof "Memory exhausted")
- gettext_noop ("Invalid preceding regular expression") /* REG_BADRPT */
- "\0"
-#define REG_EEND_IDX (REG_BADRPT_IDX + sizeof "Invalid preceding regular expression")
- gettext_noop ("Premature end of regular expression") /* REG_EEND */
- "\0"
-#define REG_ESIZE_IDX (REG_EEND_IDX + sizeof "Premature end of regular expression")
- gettext_noop ("Regular expression too big") /* REG_ESIZE */
- "\0"
-#define REG_ERPAREN_IDX (REG_ESIZE_IDX + sizeof "Regular expression too big")
- gettext_noop ("Unmatched ) or \\)") /* REG_ERPAREN */
- };
-
-const size_t __re_error_msgid_idx[] attribute_hidden =
- {
- REG_NOERROR_IDX,
- REG_NOMATCH_IDX,
- REG_BADPAT_IDX,
- REG_ECOLLATE_IDX,
- REG_ECTYPE_IDX,
- REG_EESCAPE_IDX,
- REG_ESUBREG_IDX,
- REG_EBRACK_IDX,
- REG_EPAREN_IDX,
- REG_EBRACE_IDX,
- REG_BADBR_IDX,
- REG_ERANGE_IDX,
- REG_ESPACE_IDX,
- REG_BADRPT_IDX,
- REG_EEND_IDX,
- REG_ESIZE_IDX,
- REG_ERPAREN_IDX
- };
-
-/* Entry points for GNU code. */
-
-/* re_compile_pattern is the GNU regular expression compiler: it
- compiles PATTERN (of length LENGTH) and puts the result in BUFP.
- Returns 0 if the pattern was valid, otherwise an error string.
-
- Assumes the `allocated' (and perhaps `buffer') and `translate' fields
- are set in BUFP on entry. */
-
-const char *
-re_compile_pattern (pattern, length, bufp)
- const char *pattern;
- size_t length;
- struct re_pattern_buffer *bufp;
-{
- reg_errcode_t ret;
-
- /* And GNU code determines whether or not to get register information
- by passing null for the REGS argument to re_match, etc., not by
- setting no_sub, unless RE_NO_SUB is set. */
- bufp->no_sub = !!(re_syntax_options & RE_NO_SUB);
-
- /* Match anchors at newline. */
- bufp->newline_anchor = 1;
-
- ret = re_compile_internal (bufp, pattern, length, re_syntax_options);
-
- if (!ret)
- return NULL;
- return gettext (__re_error_msgid + __re_error_msgid_idx[(int) ret]);
-}
-#ifdef _LIBC
-weak_alias (__re_compile_pattern, re_compile_pattern)
-#endif
-
-/* Set by `re_set_syntax' to the current regexp syntax to recognize. Can
- also be assigned to arbitrarily: each pattern buffer stores its own
- syntax, so it can be changed between regex compilations. */
-/* This has no initializer because initialized variables in Emacs
- become read-only after dumping. */
-reg_syntax_t re_syntax_options;
-
-
-/* Specify the precise syntax of regexps for compilation. This provides
- for compatibility for various utilities which historically have
- different, incompatible syntaxes.
-
- The argument SYNTAX is a bit mask comprised of the various bits
- defined in regex.h. We return the old syntax. */
-
-reg_syntax_t
-re_set_syntax (syntax)
- reg_syntax_t syntax;
-{
- reg_syntax_t ret = re_syntax_options;
-
- re_syntax_options = syntax;
- return ret;
-}
-#ifdef _LIBC
-weak_alias (__re_set_syntax, re_set_syntax)
-#endif
-
-int
-re_compile_fastmap (bufp)
- struct re_pattern_buffer *bufp;
-{
- re_dfa_t *dfa = (re_dfa_t *) bufp->buffer;
- char *fastmap = bufp->fastmap;
-
- memset (fastmap, '\0', sizeof (char) * SBC_MAX);
- re_compile_fastmap_iter (bufp, dfa->init_state, fastmap);
- if (dfa->init_state != dfa->init_state_word)
- re_compile_fastmap_iter (bufp, dfa->init_state_word, fastmap);
- if (dfa->init_state != dfa->init_state_nl)
- re_compile_fastmap_iter (bufp, dfa->init_state_nl, fastmap);
- if (dfa->init_state != dfa->init_state_begbuf)
- re_compile_fastmap_iter (bufp, dfa->init_state_begbuf, fastmap);
- bufp->fastmap_accurate = 1;
- return 0;
-}
-#ifdef _LIBC
-weak_alias (__re_compile_fastmap, re_compile_fastmap)
-#endif
-
-static inline void
-__attribute ((always_inline))
-re_set_fastmap (char *fastmap, int icase, int ch)
-{
- fastmap[ch] = 1;
- if (icase)
- fastmap[tolower (ch)] = 1;
-}
-
-/* Helper function for re_compile_fastmap.
- Compile fastmap for the initial_state INIT_STATE. */
-
-static void
-re_compile_fastmap_iter (regex_t *bufp, const re_dfastate_t *init_state,
- char *fastmap)
-{
- re_dfa_t *dfa = (re_dfa_t *) bufp->buffer;
- int node_cnt;
- int icase = (dfa->mb_cur_max == 1 && (bufp->syntax & RE_ICASE));
- for (node_cnt = 0; node_cnt < init_state->nodes.nelem; ++node_cnt)
- {
- int node = init_state->nodes.elems[node_cnt];
- re_token_type_t type = dfa->nodes[node].type;
-
- if (type == CHARACTER)
- {
- re_set_fastmap (fastmap, icase, dfa->nodes[node].opr.c);
-#ifdef RE_ENABLE_I18N
- if ((bufp->syntax & RE_ICASE) && dfa->mb_cur_max > 1)
- {
- unsigned char *buf = alloca (dfa->mb_cur_max), *p;
- wchar_t wc;
- mbstate_t state;
-
- p = buf;
- *p++ = dfa->nodes[node].opr.c;
- while (++node < dfa->nodes_len
- && dfa->nodes[node].type == CHARACTER
- && dfa->nodes[node].mb_partial)
- *p++ = dfa->nodes[node].opr.c;
- memset (&state, '\0', sizeof (state));
- if (__mbrtowc (&wc, (const char *) buf, p - buf,
- &state) == p - buf
- && (__wcrtomb ((char *) buf, towlower (wc), &state)
- != (size_t) -1))
- re_set_fastmap (fastmap, 0, buf[0]);
- }
-#endif
- }
- else if (type == SIMPLE_BRACKET)
- {
- int i, ch;
- for (i = 0, ch = 0; i < BITSET_WORDS; ++i)
- {
- int j;
- bitset_word_t w = dfa->nodes[node].opr.sbcset[i];
- for (j = 0; j < BITSET_WORD_BITS; ++j, ++ch)
- if (w & ((bitset_word_t) 1 << j))
- re_set_fastmap (fastmap, icase, ch);
- }
- }
-#ifdef RE_ENABLE_I18N
- else if (type == COMPLEX_BRACKET)
- {
- re_charset_t *cset = dfa->nodes[node].opr.mbcset;
- int i;
-
-# ifdef _LIBC
- /* See if we have to try all bytes which start multiple collation
- elements.
- e.g. In da_DK, we want to catch 'a' since "aa" is a valid
- collation element, and don't catch 'b' since 'b' is
- the only collation element which starts from 'b' (and
- it is caught by SIMPLE_BRACKET). */
- if (_NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES) != 0
- && (cset->ncoll_syms || cset->nranges))
- {
- const int32_t *table = (const int32_t *)
- _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB);
- for (i = 0; i < SBC_MAX; ++i)
- if (table[i] < 0)
- re_set_fastmap (fastmap, icase, i);
- }
-# endif /* _LIBC */
-
- /* See if we have to start the match at all multibyte characters,
- i.e. where we would not find an invalid sequence. This only
- applies to multibyte character sets; for single byte character
- sets, the SIMPLE_BRACKET again suffices. */
- if (dfa->mb_cur_max > 1
- && (cset->nchar_classes || cset->non_match
-# ifdef _LIBC
- || cset->nequiv_classes
-# endif /* _LIBC */
- ))
- {
- unsigned char c = 0;
- do
- {
- mbstate_t mbs;
- memset (&mbs, 0, sizeof (mbs));
- if (__mbrtowc (NULL, (char *) &c, 1, &mbs) == (size_t) -2)
- re_set_fastmap (fastmap, false, (int) c);
- }
- while (++c != 0);
- }
-
- else
- {
- /* ... Else catch all bytes which can start the mbchars. */
- for (i = 0; i < cset->nmbchars; ++i)
- {
- char buf[256];
- mbstate_t state;
- memset (&state, '\0', sizeof (state));
- if (__wcrtomb (buf, cset->mbchars[i], &state) != (size_t) -1)
- re_set_fastmap (fastmap, icase, *(unsigned char *) buf);
- if ((bufp->syntax & RE_ICASE) && dfa->mb_cur_max > 1)
- {
- if (__wcrtomb (buf, towlower (cset->mbchars[i]), &state)
- != (size_t) -1)
- re_set_fastmap (fastmap, false, *(unsigned char *) buf);
- }
- }
- }
- }
-#endif /* RE_ENABLE_I18N */
- else if (type == OP_PERIOD
-#ifdef RE_ENABLE_I18N
- || type == OP_UTF8_PERIOD
-#endif /* RE_ENABLE_I18N */
- || type == END_OF_RE)
- {
- memset (fastmap, '\1', sizeof (char) * SBC_MAX);
- if (type == END_OF_RE)
- bufp->can_be_null = 1;
- return;
- }
- }
-}
-
-/* Entry point for POSIX code. */
-/* regcomp takes a regular expression as a string and compiles it.
-
- PREG is a regex_t *. We do not expect any fields to be initialized,
- since POSIX says we shouldn't. Thus, we set
-
- `buffer' to the compiled pattern;
- `used' to the length of the compiled pattern;
- `syntax' to RE_SYNTAX_POSIX_EXTENDED if the
- REG_EXTENDED bit in CFLAGS is set; otherwise, to
- RE_SYNTAX_POSIX_BASIC;
- `newline_anchor' to REG_NEWLINE being set in CFLAGS;
- `fastmap' to an allocated space for the fastmap;
- `fastmap_accurate' to zero;
- `re_nsub' to the number of subexpressions in PATTERN.
-
- PATTERN is the address of the pattern string.
-
- CFLAGS is a series of bits which affect compilation.
-
- If REG_EXTENDED is set, we use POSIX extended syntax; otherwise, we
- use POSIX basic syntax.
-
- If REG_NEWLINE is set, then . and [^...] don't match newline.
- Also, regexec will try a match beginning after every newline.
-
- If REG_ICASE is set, then we considers upper- and lowercase
- versions of letters to be equivalent when matching.
-
- If REG_NOSUB is set, then when PREG is passed to regexec, that
- routine will report only success or failure, and nothing about the
- registers.
-
- It returns 0 if it succeeds, nonzero if it doesn't. (See regex.h for
- the return codes and their meanings.) */
-
-int
-regcomp (preg, pattern, cflags)
- regex_t *__restrict preg;
- const char *__restrict pattern;
- int cflags;
-{
- reg_errcode_t ret;
- reg_syntax_t syntax = ((cflags & REG_EXTENDED) ? RE_SYNTAX_POSIX_EXTENDED
- : RE_SYNTAX_POSIX_BASIC);
-
- preg->buffer = NULL;
- preg->allocated = 0;
- preg->used = 0;
-
- /* Try to allocate space for the fastmap. */
- preg->fastmap = re_malloc (char, SBC_MAX);
- if (BE (preg->fastmap == NULL, 0))
- return REG_ESPACE;
-
- syntax |= (cflags & REG_ICASE) ? RE_ICASE : 0;
-
- /* If REG_NEWLINE is set, newlines are treated differently. */
- if (cflags & REG_NEWLINE)
- { /* REG_NEWLINE implies neither . nor [^...] match newline. */
- syntax &= ~RE_DOT_NEWLINE;
- syntax |= RE_HAT_LISTS_NOT_NEWLINE;
- /* It also changes the matching behavior. */
- preg->newline_anchor = 1;
- }
- else
- preg->newline_anchor = 0;
- preg->no_sub = !!(cflags & REG_NOSUB);
- preg->translate = NULL;
-
- ret = re_compile_internal (preg, pattern, strlen (pattern), syntax);
-
- /* POSIX doesn't distinguish between an unmatched open-group and an
- unmatched close-group: both are REG_EPAREN. */
- if (ret == REG_ERPAREN)
- ret = REG_EPAREN;
-
- /* We have already checked preg->fastmap != NULL. */
- if (BE (ret == REG_NOERROR, 1))
- /* Compute the fastmap now, since regexec cannot modify the pattern
- buffer. This function never fails in this implementation. */
- (void) re_compile_fastmap (preg);
- else
- {
- /* Some error occurred while compiling the expression. */
- re_free (preg->fastmap);
- preg->fastmap = NULL;
- }
-
- return (int) ret;
-}
-#ifdef _LIBC
-weak_alias (__regcomp, regcomp)
-#endif
-
-/* Returns a message corresponding to an error code, ERRCODE, returned
- from either regcomp or regexec. We don't use PREG here. */
-
-size_t
-regerror (errcode, preg, errbuf, errbuf_size)
- int errcode;
- const regex_t *__restrict preg;
- char *__restrict errbuf;
- size_t errbuf_size;
-{
- const char *msg;
- size_t msg_size;
-
- if (BE (errcode < 0
- || errcode >= (int) (sizeof (__re_error_msgid_idx)
- / sizeof (__re_error_msgid_idx[0])), 0))
- /* Only error codes returned by the rest of the code should be passed
- to this routine. If we are given anything else, or if other regex
- code generates an invalid error code, then the program has a bug.
- Dump core so we can fix it. */
- abort ();
-
- msg = gettext (__re_error_msgid + __re_error_msgid_idx[errcode]);
-
- msg_size = strlen (msg) + 1; /* Includes the null. */
-
- if (BE (errbuf_size != 0, 1))
- {
- if (BE (msg_size > errbuf_size, 0))
- {
-#if defined HAVE_MEMPCPY || defined _LIBC
- *((char *) __mempcpy (errbuf, msg, errbuf_size - 1)) = '\0';
-#else
- memcpy (errbuf, msg, errbuf_size - 1);
- errbuf[errbuf_size - 1] = 0;
-#endif
- }
- else
- memcpy (errbuf, msg, msg_size);
- }
-
- return msg_size;
-}
-#ifdef _LIBC
-weak_alias (__regerror, regerror)
-#endif
-
-
-#ifdef RE_ENABLE_I18N
-/* This static array is used for the map to single-byte characters when
- UTF-8 is used. Otherwise we would allocate memory just to initialize
- it the same all the time. UTF-8 is the preferred encoding so this is
- a worthwhile optimization. */
-static const bitset_t utf8_sb_map =
-{
- /* Set the first 128 bits. */
- [0 ... 0x80 / BITSET_WORD_BITS - 1] = BITSET_WORD_MAX
-};
-#endif
-
-
-static void
-free_dfa_content (re_dfa_t *dfa)
-{
- int i, j;
-
- if (dfa->nodes)
- for (i = 0; i < dfa->nodes_len; ++i)
- free_token (dfa->nodes + i);
- re_free (dfa->nexts);
- for (i = 0; i < dfa->nodes_len; ++i)
- {
- if (dfa->eclosures != NULL)
- re_node_set_free (dfa->eclosures + i);
- if (dfa->inveclosures != NULL)
- re_node_set_free (dfa->inveclosures + i);
- if (dfa->edests != NULL)
- re_node_set_free (dfa->edests + i);
- }
- re_free (dfa->edests);
- re_free (dfa->eclosures);
- re_free (dfa->inveclosures);
- re_free (dfa->nodes);
-
- if (dfa->state_table)
- for (i = 0; i <= dfa->state_hash_mask; ++i)
- {
- struct re_state_table_entry *entry = dfa->state_table + i;
- for (j = 0; j < entry->num; ++j)
- {
- re_dfastate_t *state = entry->array[j];
- free_state (state);
- }
- re_free (entry->array);
- }
- re_free (dfa->state_table);
-#ifdef RE_ENABLE_I18N
- if (dfa->sb_char != utf8_sb_map)
- re_free (dfa->sb_char);
-#endif
- re_free (dfa->subexp_map);
-#ifdef DEBUG
- re_free (dfa->re_str);
-#endif
-
- re_free (dfa);
-}
-
-
-/* Free dynamically allocated space used by PREG. */
-
-void
-regfree (preg)
- regex_t *preg;
-{
- re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
- if (BE (dfa != NULL, 1))
- free_dfa_content (dfa);
- preg->buffer = NULL;
- preg->allocated = 0;
-
- re_free (preg->fastmap);
- preg->fastmap = NULL;
-
- re_free (preg->translate);
- preg->translate = NULL;
-}
-#ifdef _LIBC
-weak_alias (__regfree, regfree)
-#endif
-
-/* Entry points compatible with 4.2 BSD regex library. We don't define
- them unless specifically requested. */
-
-#if defined _REGEX_RE_COMP || defined _LIBC
-
-/* BSD has one and only one pattern buffer. */
-static struct re_pattern_buffer re_comp_buf;
-
-char *
-# ifdef _LIBC
-/* Make these definitions weak in libc, so POSIX programs can redefine
- these names if they don't use our functions, and still use
- regcomp/regexec above without link errors. */
-weak_function
-# endif
-re_comp (s)
- const char *s;
-{
- reg_errcode_t ret;
- char *fastmap;
-
- if (!s)
- {
- if (!re_comp_buf.buffer)
- return gettext ("No previous regular expression");
- return 0;
- }
-
- if (re_comp_buf.buffer)
- {
- fastmap = re_comp_buf.fastmap;
- re_comp_buf.fastmap = NULL;
- __regfree (&re_comp_buf);
- memset (&re_comp_buf, '\0', sizeof (re_comp_buf));
- re_comp_buf.fastmap = fastmap;
- }
-
- if (re_comp_buf.fastmap == NULL)
- {
- re_comp_buf.fastmap = (char *) malloc (SBC_MAX);
- if (re_comp_buf.fastmap == NULL)
- return (char *) gettext (__re_error_msgid
- + __re_error_msgid_idx[(int) REG_ESPACE]);
- }
-
- /* Since `re_exec' always passes NULL for the `regs' argument, we
- don't need to initialize the pattern buffer fields which affect it. */
-
- /* Match anchors at newlines. */
- re_comp_buf.newline_anchor = 1;
-
- ret = re_compile_internal (&re_comp_buf, s, strlen (s), re_syntax_options);
-
- if (!ret)
- return NULL;
-
- /* Yes, we're discarding `const' here if !HAVE_LIBINTL. */
- return (char *) gettext (__re_error_msgid + __re_error_msgid_idx[(int) ret]);
-}
-
-#ifdef _LIBC
-libc_freeres_fn (free_mem)
-{
- __regfree (&re_comp_buf);
-}
-#endif
-
-#endif /* _REGEX_RE_COMP */
-
-/* Internal entry point.
- Compile the regular expression PATTERN, whose length is LENGTH.
- SYNTAX indicate regular expression's syntax. */
-
-static reg_errcode_t
-re_compile_internal (regex_t *preg, const char * pattern, size_t length,
- reg_syntax_t syntax)
-{
- reg_errcode_t err = REG_NOERROR;
- re_dfa_t *dfa;
- re_string_t regexp;
-
- /* Initialize the pattern buffer. */
- preg->fastmap_accurate = 0;
- preg->syntax = syntax;
- preg->not_bol = preg->not_eol = 0;
- preg->used = 0;
- preg->re_nsub = 0;
- preg->can_be_null = 0;
- preg->regs_allocated = REGS_UNALLOCATED;
-
- /* Initialize the dfa. */
- dfa = (re_dfa_t *) preg->buffer;
- if (BE (preg->allocated < sizeof (re_dfa_t), 0))
- {
- /* If zero allocated, but buffer is non-null, try to realloc
- enough space. This loses if buffer's address is bogus, but
- that is the user's responsibility. If ->buffer is NULL this
- is a simple allocation. */
- dfa = re_realloc (preg->buffer, re_dfa_t, 1);
- if (dfa == NULL)
- return REG_ESPACE;
- preg->allocated = sizeof (re_dfa_t);
- preg->buffer = (unsigned char *) dfa;
- }
- preg->used = sizeof (re_dfa_t);
-
- err = init_dfa (dfa, length);
- if (BE (err != REG_NOERROR, 0))
- {
- free_dfa_content (dfa);
- preg->buffer = NULL;
- preg->allocated = 0;
- return err;
- }
-#ifdef DEBUG
- /* Note: length+1 will not overflow since it is checked in init_dfa. */
- dfa->re_str = re_malloc (char, length + 1);
- strncpy (dfa->re_str, pattern, length + 1);
-#endif
-
- __libc_lock_init (dfa->lock);
-
- err = re_string_construct (®exp, pattern, length, preg->translate,
- syntax & RE_ICASE, dfa);
- if (BE (err != REG_NOERROR, 0))
- {
- re_compile_internal_free_return:
- free_workarea_compile (preg);
- re_string_destruct (®exp);
- free_dfa_content (dfa);
- preg->buffer = NULL;
- preg->allocated = 0;
- return err;
- }
-
- /* Parse the regular expression, and build a structure tree. */
- preg->re_nsub = 0;
- dfa->str_tree = parse (®exp, preg, syntax, &err);
- if (BE (dfa->str_tree == NULL, 0))
- goto re_compile_internal_free_return;
-
- /* Analyze the tree and create the nfa. */
- err = analyze (preg);
- if (BE (err != REG_NOERROR, 0))
- goto re_compile_internal_free_return;
-
-#ifdef RE_ENABLE_I18N
- /* If possible, do searching in single byte encoding to speed things up. */
- if (dfa->is_utf8 && !(syntax & RE_ICASE) && preg->translate == NULL)
- optimize_utf8 (dfa);
-#endif
-
- /* Then create the initial state of the dfa. */
- err = create_initial_state (dfa);
-
- /* Release work areas. */
- free_workarea_compile (preg);
- re_string_destruct (®exp);
-
- if (BE (err != REG_NOERROR, 0))
- {
- free_dfa_content (dfa);
- preg->buffer = NULL;
- preg->allocated = 0;
- }
-
- return err;
-}
-
-/* Initialize DFA. We use the length of the regular expression PAT_LEN
- as the initial length of some arrays. */
-
-static reg_errcode_t
-init_dfa (re_dfa_t *dfa, size_t pat_len)
-{
- unsigned int table_size;
-#ifndef _LIBC
- char *codeset_name;
-#endif
-
- memset (dfa, '\0', sizeof (re_dfa_t));
-
- /* Force allocation of str_tree_storage the first time. */
- dfa->str_tree_storage_idx = BIN_TREE_STORAGE_SIZE;
-
- /* Avoid overflows. */
- if (pat_len == SIZE_MAX)
- return REG_ESPACE;
-
- dfa->nodes_alloc = pat_len + 1;
- dfa->nodes = re_malloc (re_token_t, dfa->nodes_alloc);
-
- /* table_size = 2 ^ ceil(log pat_len) */
- for (table_size = 1; ; table_size <<= 1)
- if (table_size > pat_len)
- break;
-
- dfa->state_table = calloc (sizeof (struct re_state_table_entry), table_size);
- dfa->state_hash_mask = table_size - 1;
-
- dfa->mb_cur_max = MB_CUR_MAX;
-#ifdef _LIBC
- if (dfa->mb_cur_max == 6
- && strcmp (_NL_CURRENT (LC_CTYPE, _NL_CTYPE_CODESET_NAME), "UTF-8") == 0)
- dfa->is_utf8 = 1;
- dfa->map_notascii = (_NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_MAP_TO_NONASCII)
- != 0);
-#else
-# ifdef HAVE_LANGINFO_CODESET
- codeset_name = nl_langinfo (CODESET);
-# else
- codeset_name = getenv ("LC_ALL");
- if (codeset_name == NULL || codeset_name[0] == '\0')
- codeset_name = getenv ("LC_CTYPE");
- if (codeset_name == NULL || codeset_name[0] == '\0')
- codeset_name = getenv ("LANG");
- if (codeset_name == NULL)
- codeset_name = "";
- else if (strchr (codeset_name, '.') != NULL)
- codeset_name = strchr (codeset_name, '.') + 1;
-# endif
-
- if (strcasecmp (codeset_name, "UTF-8") == 0
- || strcasecmp (codeset_name, "UTF8") == 0)
- dfa->is_utf8 = 1;
-
- /* We check exhaustively in the loop below if this charset is a
- superset of ASCII. */
- dfa->map_notascii = 0;
-#endif
-
-#ifdef RE_ENABLE_I18N
- if (dfa->mb_cur_max > 1)
- {
- if (dfa->is_utf8)
- dfa->sb_char = (re_bitset_ptr_t) utf8_sb_map;
- else
- {
- int i, j, ch;
-
- dfa->sb_char = (re_bitset_ptr_t) calloc (sizeof (bitset_t), 1);
- if (BE (dfa->sb_char == NULL, 0))
- return REG_ESPACE;
-
- /* Set the bits corresponding to single byte chars. */
- for (i = 0, ch = 0; i < BITSET_WORDS; ++i)
- for (j = 0; j < BITSET_WORD_BITS; ++j, ++ch)
- {
- wint_t wch = __btowc (ch);
- if (wch != WEOF)
- dfa->sb_char[i] |= (bitset_word_t) 1 << j;
-# ifndef _LIBC
- if (isascii (ch) && wch != ch)
- dfa->map_notascii = 1;
-# endif
- }
- }
- }
-#endif
-
- if (BE (dfa->nodes == NULL || dfa->state_table == NULL, 0))
- return REG_ESPACE;
- return REG_NOERROR;
-}
-
-/* Initialize WORD_CHAR table, which indicate which character is
- "word". In this case "word" means that it is the word construction
- character used by some operators like "\<", "\>", etc. */
-
-static void
-internal_function
-init_word_char (re_dfa_t *dfa)
-{
- int i, j, ch;
- dfa->word_ops_used = 1;
- for (i = 0, ch = 0; i < BITSET_WORDS; ++i)
- for (j = 0; j < BITSET_WORD_BITS; ++j, ++ch)
- if (isalnum (ch) || ch == '_')
- dfa->word_char[i] |= (bitset_word_t) 1 << j;
-}
-
-/* Free the work area which are only used while compiling. */
-
-static void
-free_workarea_compile (regex_t *preg)
-{
- re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
- bin_tree_storage_t *storage, *next;
- for (storage = dfa->str_tree_storage; storage; storage = next)
- {
- next = storage->next;
- re_free (storage);
- }
- dfa->str_tree_storage = NULL;
- dfa->str_tree_storage_idx = BIN_TREE_STORAGE_SIZE;
- dfa->str_tree = NULL;
- re_free (dfa->org_indices);
- dfa->org_indices = NULL;
-}
-
-/* Create initial states for all contexts. */
-
-static reg_errcode_t
-create_initial_state (re_dfa_t *dfa)
-{
- int first, i;
- reg_errcode_t err;
- re_node_set init_nodes;
-
- /* Initial states have the epsilon closure of the node which is
- the first node of the regular expression. */
- first = dfa->str_tree->first->node_idx;
- dfa->init_node = first;
- err = re_node_set_init_copy (&init_nodes, dfa->eclosures + first);
- if (BE (err != REG_NOERROR, 0))
- return err;
-
- /* The back-references which are in initial states can epsilon transit,
- since in this case all of the subexpressions can be null.
- Then we add epsilon closures of the nodes which are the next nodes of
- the back-references. */
- if (dfa->nbackref > 0)
- for (i = 0; i < init_nodes.nelem; ++i)
- {
- int node_idx = init_nodes.elems[i];
- re_token_type_t type = dfa->nodes[node_idx].type;
-
- int clexp_idx;
- if (type != OP_BACK_REF)
- continue;
- for (clexp_idx = 0; clexp_idx < init_nodes.nelem; ++clexp_idx)
- {
- re_token_t *clexp_node;
- clexp_node = dfa->nodes + init_nodes.elems[clexp_idx];
- if (clexp_node->type == OP_CLOSE_SUBEXP
- && clexp_node->opr.idx == dfa->nodes[node_idx].opr.idx)
- break;
- }
- if (clexp_idx == init_nodes.nelem)
- continue;
-
- if (type == OP_BACK_REF)
- {
- int dest_idx = dfa->edests[node_idx].elems[0];
- if (!re_node_set_contains (&init_nodes, dest_idx))
- {
- re_node_set_merge (&init_nodes, dfa->eclosures + dest_idx);
- i = 0;
- }
- }
- }
-
- /* It must be the first time to invoke acquire_state. */
- dfa->init_state = re_acquire_state_context (&err, dfa, &init_nodes, 0);
- /* We don't check ERR here, since the initial state must not be NULL. */
- if (BE (dfa->init_state == NULL, 0))
- return err;
- if (dfa->init_state->has_constraint)
- {
- dfa->init_state_word = re_acquire_state_context (&err, dfa, &init_nodes,
- CONTEXT_WORD);
- dfa->init_state_nl = re_acquire_state_context (&err, dfa, &init_nodes,
- CONTEXT_NEWLINE);
- dfa->init_state_begbuf = re_acquire_state_context (&err, dfa,
- &init_nodes,
- CONTEXT_NEWLINE
- | CONTEXT_BEGBUF);
- if (BE (dfa->init_state_word == NULL || dfa->init_state_nl == NULL
- || dfa->init_state_begbuf == NULL, 0))
- return err;
- }
- else
- dfa->init_state_word = dfa->init_state_nl
- = dfa->init_state_begbuf = dfa->init_state;
-
- re_node_set_free (&init_nodes);
- return REG_NOERROR;
-}
-
-#ifdef RE_ENABLE_I18N
-/* If it is possible to do searching in single byte encoding instead of UTF-8
- to speed things up, set dfa->mb_cur_max to 1, clear is_utf8 and change
- DFA nodes where needed. */
-
-static void
-optimize_utf8 (re_dfa_t *dfa)
-{
- int node, i, mb_chars = 0, has_period = 0;
-
- for (node = 0; node < dfa->nodes_len; ++node)
- switch (dfa->nodes[node].type)
- {
- case CHARACTER:
- if (dfa->nodes[node].opr.c >= 0x80)
- mb_chars = 1;
- break;
- case ANCHOR:
- switch (dfa->nodes[node].opr.ctx_type)
- {
- case LINE_FIRST:
- case LINE_LAST:
- case BUF_FIRST:
- case BUF_LAST:
- break;
- default:
- /* Word anchors etc. cannot be handled. It's okay to test
- opr.ctx_type since constraints (for all DFA nodes) are
- created by ORing one or more opr.ctx_type values. */
- return;
- }
- break;
- case OP_PERIOD:
- has_period = 1;
- break;
- case OP_BACK_REF:
- case OP_ALT:
- case END_OF_RE:
- case OP_DUP_ASTERISK:
- case OP_OPEN_SUBEXP:
- case OP_CLOSE_SUBEXP:
- break;
- case COMPLEX_BRACKET:
- return;
- case SIMPLE_BRACKET:
- /* Just double check. The non-ASCII range starts at 0x80. */
- assert (0x80 % BITSET_WORD_BITS == 0);
- for (i = 0x80 / BITSET_WORD_BITS; i < BITSET_WORDS; ++i)
- if (dfa->nodes[node].opr.sbcset[i])
- return;
- break;
- default:
- abort ();
- }
-
- if (mb_chars || has_period)
- for (node = 0; node < dfa->nodes_len; ++node)
- {
- if (dfa->nodes[node].type == CHARACTER
- && dfa->nodes[node].opr.c >= 0x80)
- dfa->nodes[node].mb_partial = 0;
- else if (dfa->nodes[node].type == OP_PERIOD)
- dfa->nodes[node].type = OP_UTF8_PERIOD;
- }
-
- /* The search can be in single byte locale. */
- dfa->mb_cur_max = 1;
- dfa->is_utf8 = 0;
- dfa->has_mb_node = dfa->nbackref > 0 || has_period;
-}
-#endif
-
-/* Analyze the structure tree, and calculate "first", "next", "edest",
- "eclosure", and "inveclosure". */
-
-static reg_errcode_t
-analyze (regex_t *preg)
-{
- re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
- reg_errcode_t ret;
-
- /* Allocate arrays. */
- dfa->nexts = re_malloc (int, dfa->nodes_alloc);
- dfa->org_indices = re_malloc (int, dfa->nodes_alloc);
- dfa->edests = re_malloc (re_node_set, dfa->nodes_alloc);
- dfa->eclosures = re_malloc (re_node_set, dfa->nodes_alloc);
- if (BE (dfa->nexts == NULL || dfa->org_indices == NULL || dfa->edests == NULL
- || dfa->eclosures == NULL, 0))
- return REG_ESPACE;
-
- dfa->subexp_map = re_malloc (int, preg->re_nsub);
- if (dfa->subexp_map != NULL)
- {
- int i;
- for (i = 0; i < preg->re_nsub; i++)
- dfa->subexp_map[i] = i;
- preorder (dfa->str_tree, optimize_subexps, dfa);
- for (i = 0; i < preg->re_nsub; i++)
- if (dfa->subexp_map[i] != i)
- break;
- if (i == preg->re_nsub)
- {
- free (dfa->subexp_map);
- dfa->subexp_map = NULL;
- }
- }
-
- ret = postorder (dfa->str_tree, lower_subexps, preg);
- if (BE (ret != REG_NOERROR, 0))
- return ret;
- ret = postorder (dfa->str_tree, calc_first, dfa);
- if (BE (ret != REG_NOERROR, 0))
- return ret;
- preorder (dfa->str_tree, calc_next, dfa);
- ret = preorder (dfa->str_tree, link_nfa_nodes, dfa);
- if (BE (ret != REG_NOERROR, 0))
- return ret;
- ret = calc_eclosure (dfa);
- if (BE (ret != REG_NOERROR, 0))
- return ret;
-
- /* We only need this during the prune_impossible_nodes pass in regexec.c;
- skip it if p_i_n will not run, as calc_inveclosure can be quadratic. */
- if ((!preg->no_sub && preg->re_nsub > 0 && dfa->has_plural_match)
- || dfa->nbackref)
- {
- dfa->inveclosures = re_malloc (re_node_set, dfa->nodes_len);
- if (BE (dfa->inveclosures == NULL, 0))
- return REG_ESPACE;
- ret = calc_inveclosure (dfa);
- }
-
- return ret;
-}
-
-/* Our parse trees are very unbalanced, so we cannot use a stack to
- implement parse tree visits. Instead, we use parent pointers and
- some hairy code in these two functions. */
-static reg_errcode_t
-postorder (bin_tree_t *root, reg_errcode_t (fn (void *, bin_tree_t *)),
- void *extra)
-{
- bin_tree_t *node, *prev;
-
- for (node = root; ; )
- {
- /* Descend down the tree, preferably to the left (or to the right
- if that's the only child). */
- while (node->left || node->right)
- if (node->left)
- node = node->left;
- else
- node = node->right;
-
- do
- {
- reg_errcode_t err = fn (extra, node);
- if (BE (err != REG_NOERROR, 0))
- return err;
- if (node->parent == NULL)
- return REG_NOERROR;
- prev = node;
- node = node->parent;
- }
- /* Go up while we have a node that is reached from the right. */
- while (node->right == prev || node->right == NULL);
- node = node->right;
- }
-}
-
-static reg_errcode_t
-preorder (bin_tree_t *root, reg_errcode_t (fn (void *, bin_tree_t *)),
- void *extra)
-{
- bin_tree_t *node;
-
- for (node = root; ; )
- {
- reg_errcode_t err = fn (extra, node);
- if (BE (err != REG_NOERROR, 0))
- return err;
-
- /* Go to the left node, or up and to the right. */
- if (node->left)
- node = node->left;
- else
- {
- bin_tree_t *prev = NULL;
- while (node->right == prev || node->right == NULL)
- {
- prev = node;
- node = node->parent;
- if (!node)
- return REG_NOERROR;
- }
- node = node->right;
- }
- }
-}
-
-/* Optimization pass: if a SUBEXP is entirely contained, strip it and tell
- re_search_internal to map the inner one's opr.idx to this one's. Adjust
- backreferences as well. Requires a preorder visit. */
-static reg_errcode_t
-optimize_subexps (void *extra, bin_tree_t *node)
-{
- re_dfa_t *dfa = (re_dfa_t *) extra;
-
- if (node->token.type == OP_BACK_REF && dfa->subexp_map)
- {
- int idx = node->token.opr.idx;
- node->token.opr.idx = dfa->subexp_map[idx];
- dfa->used_bkref_map |= 1 << node->token.opr.idx;
- }
-
- else if (node->token.type == SUBEXP
- && node->left && node->left->token.type == SUBEXP)
- {
- int other_idx = node->left->token.opr.idx;
-
- node->left = node->left->left;
- if (node->left)
- node->left->parent = node;
-
- dfa->subexp_map[other_idx] = dfa->subexp_map[node->token.opr.idx];
- if (other_idx < BITSET_WORD_BITS)
- dfa->used_bkref_map &= ~((bitset_word_t) 1 << other_idx);
- }
-
- return REG_NOERROR;
-}
-
-/* Lowering pass: Turn each SUBEXP node into the appropriate concatenation
- of OP_OPEN_SUBEXP, the body of the SUBEXP (if any) and OP_CLOSE_SUBEXP. */
-static reg_errcode_t
-lower_subexps (void *extra, bin_tree_t *node)
-{
- regex_t *preg = (regex_t *) extra;
- reg_errcode_t err = REG_NOERROR;
-
- if (node->left && node->left->token.type == SUBEXP)
- {
- node->left = lower_subexp (&err, preg, node->left);
- if (node->left)
- node->left->parent = node;
- }
- if (node->right && node->right->token.type == SUBEXP)
- {
- node->right = lower_subexp (&err, preg, node->right);
- if (node->right)
- node->right->parent = node;
- }
-
- return err;
-}
-
-static bin_tree_t *
-lower_subexp (reg_errcode_t *err, regex_t *preg, bin_tree_t *node)
-{
- re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
- bin_tree_t *body = node->left;
- bin_tree_t *op, *cls, *tree1, *tree;
-
- if (preg->no_sub
- /* We do not optimize empty subexpressions, because otherwise we may
- have bad CONCAT nodes with NULL children. This is obviously not
- very common, so we do not lose much. An example that triggers
- this case is the sed "script" /\(\)/x. */
- && node->left != NULL
- && (node->token.opr.idx >= BITSET_WORD_BITS
- || !(dfa->used_bkref_map
- & ((bitset_word_t) 1 << node->token.opr.idx))))
- return node->left;
-
- /* Convert the SUBEXP node to the concatenation of an
- OP_OPEN_SUBEXP, the contents, and an OP_CLOSE_SUBEXP. */
- op = create_tree (dfa, NULL, NULL, OP_OPEN_SUBEXP);
- cls = create_tree (dfa, NULL, NULL, OP_CLOSE_SUBEXP);
- tree1 = body ? create_tree (dfa, body, cls, CONCAT) : cls;
- tree = create_tree (dfa, op, tree1, CONCAT);
- if (BE (tree == NULL || tree1 == NULL || op == NULL || cls == NULL, 0))
- {
- *err = REG_ESPACE;
- return NULL;
- }
-
- op->token.opr.idx = cls->token.opr.idx = node->token.opr.idx;
- op->token.opt_subexp = cls->token.opt_subexp = node->token.opt_subexp;
- return tree;
-}
-
-/* Pass 1 in building the NFA: compute FIRST and create unlinked automaton
- nodes. Requires a postorder visit. */
-static reg_errcode_t
-calc_first (void *extra, bin_tree_t *node)
-{
- re_dfa_t *dfa = (re_dfa_t *) extra;
- if (node->token.type == CONCAT)
- {
- node->first = node->left->first;
- node->node_idx = node->left->node_idx;
- }
- else
- {
- node->first = node;
- node->node_idx = re_dfa_add_node (dfa, node->token);
- if (BE (node->node_idx == -1, 0))
- return REG_ESPACE;
- if (node->token.type == ANCHOR)
- dfa->nodes[node->node_idx].constraint = node->token.opr.ctx_type;
- }
- return REG_NOERROR;
-}
-
-/* Pass 2: compute NEXT on the tree. Preorder visit. */
-static reg_errcode_t
-calc_next (void *extra, bin_tree_t *node)
-{
- switch (node->token.type)
- {
- case OP_DUP_ASTERISK:
- node->left->next = node;
- break;
- case CONCAT:
- node->left->next = node->right->first;
- node->right->next = node->next;
- break;
- default:
- if (node->left)
- node->left->next = node->next;
- if (node->right)
- node->right->next = node->next;
- break;
- }
- return REG_NOERROR;
-}
-
-/* Pass 3: link all DFA nodes to their NEXT node (any order will do). */
-static reg_errcode_t
-link_nfa_nodes (void *extra, bin_tree_t *node)
-{
- re_dfa_t *dfa = (re_dfa_t *) extra;
- int idx = node->node_idx;
- reg_errcode_t err = REG_NOERROR;
-
- switch (node->token.type)
- {
- case CONCAT:
- break;
-
- case END_OF_RE:
- assert (node->next == NULL);
- break;
-
- case OP_DUP_ASTERISK:
- case OP_ALT:
- {
- int left, right;
- dfa->has_plural_match = 1;
- if (node->left != NULL)
- left = node->left->first->node_idx;
- else
- left = node->next->node_idx;
- if (node->right != NULL)
- right = node->right->first->node_idx;
- else
- right = node->next->node_idx;
- assert (left > -1);
- assert (right > -1);
- err = re_node_set_init_2 (dfa->edests + idx, left, right);
- }
- break;
-
- case ANCHOR:
- case OP_OPEN_SUBEXP:
- case OP_CLOSE_SUBEXP:
- err = re_node_set_init_1 (dfa->edests + idx, node->next->node_idx);
- break;
-
- case OP_BACK_REF:
- dfa->nexts[idx] = node->next->node_idx;
- if (node->token.type == OP_BACK_REF)
- re_node_set_init_1 (dfa->edests + idx, dfa->nexts[idx]);
- break;
-
- default:
- assert (!IS_EPSILON_NODE (node->token.type));
- dfa->nexts[idx] = node->next->node_idx;
- break;
- }
-
- return err;
-}
-
-/* Duplicate the epsilon closure of the node ROOT_NODE.
- Note that duplicated nodes have constraint INIT_CONSTRAINT in addition
- to their own constraint. */
-
-static reg_errcode_t
-internal_function
-duplicate_node_closure (re_dfa_t *dfa, int top_org_node, int top_clone_node,
- int root_node, unsigned int init_constraint)
-{
- int org_node, clone_node, ret;
- unsigned int constraint = init_constraint;
- for (org_node = top_org_node, clone_node = top_clone_node;;)
- {
- int org_dest, clone_dest;
- if (dfa->nodes[org_node].type == OP_BACK_REF)
- {
- /* If the back reference epsilon-transit, its destination must
- also have the constraint. Then duplicate the epsilon closure
- of the destination of the back reference, and store it in
- edests of the back reference. */
- org_dest = dfa->nexts[org_node];
- re_node_set_empty (dfa->edests + clone_node);
- clone_dest = duplicate_node (dfa, org_dest, constraint);
- if (BE (clone_dest == -1, 0))
- return REG_ESPACE;
- dfa->nexts[clone_node] = dfa->nexts[org_node];
- ret = re_node_set_insert (dfa->edests + clone_node, clone_dest);
- if (BE (ret < 0, 0))
- return REG_ESPACE;
- }
- else if (dfa->edests[org_node].nelem == 0)
- {
- /* In case of the node can't epsilon-transit, don't duplicate the
- destination and store the original destination as the
- destination of the node. */
- dfa->nexts[clone_node] = dfa->nexts[org_node];
- break;
- }
- else if (dfa->edests[org_node].nelem == 1)
- {
- /* In case of the node can epsilon-transit, and it has only one
- destination. */
- org_dest = dfa->edests[org_node].elems[0];
- re_node_set_empty (dfa->edests + clone_node);
- /* If the node is root_node itself, it means the epsilon clsoure
- has a loop. Then tie it to the destination of the root_node. */
- if (org_node == root_node && clone_node != org_node)
- {
- ret = re_node_set_insert (dfa->edests + clone_node, org_dest);
- if (BE (ret < 0, 0))
- return REG_ESPACE;
- break;
- }
- /* In case of the node has another constraint, add it. */
- constraint |= dfa->nodes[org_node].constraint;
- clone_dest = duplicate_node (dfa, org_dest, constraint);
- if (BE (clone_dest == -1, 0))
- return REG_ESPACE;
- ret = re_node_set_insert (dfa->edests + clone_node, clone_dest);
- if (BE (ret < 0, 0))
- return REG_ESPACE;
- }
- else /* dfa->edests[org_node].nelem == 2 */
- {
- /* In case of the node can epsilon-transit, and it has two
- destinations. In the bin_tree_t and DFA, that's '|' and '*'. */
- org_dest = dfa->edests[org_node].elems[0];
- re_node_set_empty (dfa->edests + clone_node);
- /* Search for a duplicated node which satisfies the constraint. */
- clone_dest = search_duplicated_node (dfa, org_dest, constraint);
- if (clone_dest == -1)
- {
- /* There is no such duplicated node, create a new one. */
- reg_errcode_t err;
- clone_dest = duplicate_node (dfa, org_dest, constraint);
- if (BE (clone_dest == -1, 0))
- return REG_ESPACE;
- ret = re_node_set_insert (dfa->edests + clone_node, clone_dest);
- if (BE (ret < 0, 0))
- return REG_ESPACE;
- err = duplicate_node_closure (dfa, org_dest, clone_dest,
- root_node, constraint);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
- else
- {
- /* There is a duplicated node which satisfies the constraint,
- use it to avoid infinite loop. */
- ret = re_node_set_insert (dfa->edests + clone_node, clone_dest);
- if (BE (ret < 0, 0))
- return REG_ESPACE;
- }
-
- org_dest = dfa->edests[org_node].elems[1];
- clone_dest = duplicate_node (dfa, org_dest, constraint);
- if (BE (clone_dest == -1, 0))
- return REG_ESPACE;
- ret = re_node_set_insert (dfa->edests + clone_node, clone_dest);
- if (BE (ret < 0, 0))
- return REG_ESPACE;
- }
- org_node = org_dest;
- clone_node = clone_dest;
- }
- return REG_NOERROR;
-}
-
-/* Search for a node which is duplicated from the node ORG_NODE, and
- satisfies the constraint CONSTRAINT. */
-
-static int
-search_duplicated_node (const re_dfa_t *dfa, int org_node,
- unsigned int constraint)
-{
- int idx;
- for (idx = dfa->nodes_len - 1; dfa->nodes[idx].duplicated && idx > 0; --idx)
- {
- if (org_node == dfa->org_indices[idx]
- && constraint == dfa->nodes[idx].constraint)
- return idx; /* Found. */
- }
- return -1; /* Not found. */
-}
-
-/* Duplicate the node whose index is ORG_IDX and set the constraint CONSTRAINT.
- Return the index of the new node, or -1 if insufficient storage is
- available. */
-
-static int
-duplicate_node (re_dfa_t *dfa, int org_idx, unsigned int constraint)
-{
- int dup_idx = re_dfa_add_node (dfa, dfa->nodes[org_idx]);
- if (BE (dup_idx != -1, 1))
- {
- dfa->nodes[dup_idx].constraint = constraint;
- dfa->nodes[dup_idx].constraint |= dfa->nodes[org_idx].constraint;
- dfa->nodes[dup_idx].duplicated = 1;
-
- /* Store the index of the original node. */
- dfa->org_indices[dup_idx] = org_idx;
- }
- return dup_idx;
-}
-
-static reg_errcode_t
-calc_inveclosure (re_dfa_t *dfa)
-{
- int src, idx, ret;
- for (idx = 0; idx < dfa->nodes_len; ++idx)
- re_node_set_init_empty (dfa->inveclosures + idx);
-
- for (src = 0; src < dfa->nodes_len; ++src)
- {
- int *elems = dfa->eclosures[src].elems;
- for (idx = 0; idx < dfa->eclosures[src].nelem; ++idx)
- {
- ret = re_node_set_insert_last (dfa->inveclosures + elems[idx], src);
- if (BE (ret == -1, 0))
- return REG_ESPACE;
- }
- }
-
- return REG_NOERROR;
-}
-
-/* Calculate "eclosure" for all the node in DFA. */
-
-static reg_errcode_t
-calc_eclosure (re_dfa_t *dfa)
-{
- int node_idx, incomplete;
-#ifdef DEBUG
- assert (dfa->nodes_len > 0);
-#endif
- incomplete = 0;
- /* For each nodes, calculate epsilon closure. */
- for (node_idx = 0; ; ++node_idx)
- {
- reg_errcode_t err;
- re_node_set eclosure_elem;
- if (node_idx == dfa->nodes_len)
- {
- if (!incomplete)
- break;
- incomplete = 0;
- node_idx = 0;
- }
-
-#ifdef DEBUG
- assert (dfa->eclosures[node_idx].nelem != -1);
-#endif
-
- /* If we have already calculated, skip it. */
- if (dfa->eclosures[node_idx].nelem != 0)
- continue;
- /* Calculate epsilon closure of `node_idx'. */
- err = calc_eclosure_iter (&eclosure_elem, dfa, node_idx, 1);
- if (BE (err != REG_NOERROR, 0))
- return err;
-
- if (dfa->eclosures[node_idx].nelem == 0)
- {
- incomplete = 1;
- re_node_set_free (&eclosure_elem);
- }
- }
- return REG_NOERROR;
-}
-
-/* Calculate epsilon closure of NODE. */
-
-static reg_errcode_t
-calc_eclosure_iter (re_node_set *new_set, re_dfa_t *dfa, int node, int root)
-{
- reg_errcode_t err;
- int i, incomplete;
- re_node_set eclosure;
- incomplete = 0;
- err = re_node_set_alloc (&eclosure, dfa->edests[node].nelem + 1);
- if (BE (err != REG_NOERROR, 0))
- return err;
-
- /* This indicates that we are calculating this node now.
- We reference this value to avoid infinite loop. */
- dfa->eclosures[node].nelem = -1;
-
- /* If the current node has constraints, duplicate all nodes
- since they must inherit the constraints. */
- if (dfa->nodes[node].constraint
- && dfa->edests[node].nelem
- && !dfa->nodes[dfa->edests[node].elems[0]].duplicated)
- {
- err = duplicate_node_closure (dfa, node, node, node,
- dfa->nodes[node].constraint);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
-
- /* Expand each epsilon destination nodes. */
- if (IS_EPSILON_NODE(dfa->nodes[node].type))
- for (i = 0; i < dfa->edests[node].nelem; ++i)
- {
- re_node_set eclosure_elem;
- int edest = dfa->edests[node].elems[i];
- /* If calculating the epsilon closure of `edest' is in progress,
- return intermediate result. */
- if (dfa->eclosures[edest].nelem == -1)
- {
- incomplete = 1;
- continue;
- }
- /* If we haven't calculated the epsilon closure of `edest' yet,
- calculate now. Otherwise use calculated epsilon closure. */
- if (dfa->eclosures[edest].nelem == 0)
- {
- err = calc_eclosure_iter (&eclosure_elem, dfa, edest, 0);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
- else
- eclosure_elem = dfa->eclosures[edest];
- /* Merge the epsilon closure of `edest'. */
- re_node_set_merge (&eclosure, &eclosure_elem);
- /* If the epsilon closure of `edest' is incomplete,
- the epsilon closure of this node is also incomplete. */
- if (dfa->eclosures[edest].nelem == 0)
- {
- incomplete = 1;
- re_node_set_free (&eclosure_elem);
- }
- }
-
- /* Epsilon closures include itself. */
- re_node_set_insert (&eclosure, node);
- if (incomplete && !root)
- dfa->eclosures[node].nelem = 0;
- else
- dfa->eclosures[node] = eclosure;
- *new_set = eclosure;
- return REG_NOERROR;
-}
-
-/* Functions for token which are used in the parser. */
-
-/* Fetch a token from INPUT.
- We must not use this function inside bracket expressions. */
-
-static void
-internal_function
-fetch_token (re_token_t *result, re_string_t *input, reg_syntax_t syntax)
-{
- re_string_skip_bytes (input, peek_token (result, input, syntax));
-}
-
-/* Peek a token from INPUT, and return the length of the token.
- We must not use this function inside bracket expressions. */
-
-static int
-internal_function
-peek_token (re_token_t *token, re_string_t *input, reg_syntax_t syntax)
-{
- unsigned char c;
-
- if (re_string_eoi (input))
- {
- token->type = END_OF_RE;
- return 0;
- }
-
- c = re_string_peek_byte (input, 0);
- token->opr.c = c;
-
- token->word_char = 0;
-#ifdef RE_ENABLE_I18N
- token->mb_partial = 0;
- if (input->mb_cur_max > 1 &&
- !re_string_first_byte (input, re_string_cur_idx (input)))
- {
- token->type = CHARACTER;
- token->mb_partial = 1;
- return 1;
- }
-#endif
- if (c == '\\')
- {
- unsigned char c2;
- if (re_string_cur_idx (input) + 1 >= re_string_length (input))
- {
- token->type = BACK_SLASH;
- return 1;
- }
-
- c2 = re_string_peek_byte_case (input, 1);
- token->opr.c = c2;
- token->type = CHARACTER;
-#ifdef RE_ENABLE_I18N
- if (input->mb_cur_max > 1)
- {
- wint_t wc = re_string_wchar_at (input,
- re_string_cur_idx (input) + 1);
- token->word_char = IS_WIDE_WORD_CHAR (wc) != 0;
- }
- else
-#endif
- token->word_char = IS_WORD_CHAR (c2) != 0;
-
- switch (c2)
- {
- case '|':
- if (!(syntax & RE_LIMITED_OPS) && !(syntax & RE_NO_BK_VBAR))
- token->type = OP_ALT;
- break;
- case '1': case '2': case '3': case '4': case '5':
- case '6': case '7': case '8': case '9':
- if (!(syntax & RE_NO_BK_REFS))
- {
- token->type = OP_BACK_REF;
- token->opr.idx = c2 - '1';
- }
- break;
- case '<':
- if (!(syntax & RE_NO_GNU_OPS))
- {
- token->type = ANCHOR;
- token->opr.ctx_type = WORD_FIRST;
- }
- break;
- case '>':
- if (!(syntax & RE_NO_GNU_OPS))
- {
- token->type = ANCHOR;
- token->opr.ctx_type = WORD_LAST;
- }
- break;
- case 'b':
- if (!(syntax & RE_NO_GNU_OPS))
- {
- token->type = ANCHOR;
- token->opr.ctx_type = WORD_DELIM;
- }
- break;
- case 'B':
- if (!(syntax & RE_NO_GNU_OPS))
- {
- token->type = ANCHOR;
- token->opr.ctx_type = NOT_WORD_DELIM;
- }
- break;
- case 'w':
- if (!(syntax & RE_NO_GNU_OPS))
- token->type = OP_WORD;
- break;
- case 'W':
- if (!(syntax & RE_NO_GNU_OPS))
- token->type = OP_NOTWORD;
- break;
- case 's':
- if (!(syntax & RE_NO_GNU_OPS))
- token->type = OP_SPACE;
- break;
- case 'S':
- if (!(syntax & RE_NO_GNU_OPS))
- token->type = OP_NOTSPACE;
- break;
- case '`':
- if (!(syntax & RE_NO_GNU_OPS))
- {
- token->type = ANCHOR;
- token->opr.ctx_type = BUF_FIRST;
- }
- break;
- case '\'':
- if (!(syntax & RE_NO_GNU_OPS))
- {
- token->type = ANCHOR;
- token->opr.ctx_type = BUF_LAST;
- }
- break;
- case '(':
- if (!(syntax & RE_NO_BK_PARENS))
- token->type = OP_OPEN_SUBEXP;
- break;
- case ')':
- if (!(syntax & RE_NO_BK_PARENS))
- token->type = OP_CLOSE_SUBEXP;
- break;
- case '+':
- if (!(syntax & RE_LIMITED_OPS) && (syntax & RE_BK_PLUS_QM))
- token->type = OP_DUP_PLUS;
- break;
- case '?':
- if (!(syntax & RE_LIMITED_OPS) && (syntax & RE_BK_PLUS_QM))
- token->type = OP_DUP_QUESTION;
- break;
- case '{':
- if ((syntax & RE_INTERVALS) && (!(syntax & RE_NO_BK_BRACES)))
- token->type = OP_OPEN_DUP_NUM;
- break;
- case '}':
- if ((syntax & RE_INTERVALS) && (!(syntax & RE_NO_BK_BRACES)))
- token->type = OP_CLOSE_DUP_NUM;
- break;
- default:
- break;
- }
- return 2;
- }
-
- token->type = CHARACTER;
-#ifdef RE_ENABLE_I18N
- if (input->mb_cur_max > 1)
- {
- wint_t wc = re_string_wchar_at (input, re_string_cur_idx (input));
- token->word_char = IS_WIDE_WORD_CHAR (wc) != 0;
- }
- else
-#endif
- token->word_char = IS_WORD_CHAR (token->opr.c);
-
- switch (c)
- {
- case '\n':
- if (syntax & RE_NEWLINE_ALT)
- token->type = OP_ALT;
- break;
- case '|':
- if (!(syntax & RE_LIMITED_OPS) && (syntax & RE_NO_BK_VBAR))
- token->type = OP_ALT;
- break;
- case '*':
- token->type = OP_DUP_ASTERISK;
- break;
- case '+':
- if (!(syntax & RE_LIMITED_OPS) && !(syntax & RE_BK_PLUS_QM))
- token->type = OP_DUP_PLUS;
- break;
- case '?':
- if (!(syntax & RE_LIMITED_OPS) && !(syntax & RE_BK_PLUS_QM))
- token->type = OP_DUP_QUESTION;
- break;
- case '{':
- if ((syntax & RE_INTERVALS) && (syntax & RE_NO_BK_BRACES))
- token->type = OP_OPEN_DUP_NUM;
- break;
- case '}':
- if ((syntax & RE_INTERVALS) && (syntax & RE_NO_BK_BRACES))
- token->type = OP_CLOSE_DUP_NUM;
- break;
- case '(':
- if (syntax & RE_NO_BK_PARENS)
- token->type = OP_OPEN_SUBEXP;
- break;
- case ')':
- if (syntax & RE_NO_BK_PARENS)
- token->type = OP_CLOSE_SUBEXP;
- break;
- case '[':
- token->type = OP_OPEN_BRACKET;
- break;
- case '.':
- token->type = OP_PERIOD;
- break;
- case '^':
- if (!(syntax & (RE_CONTEXT_INDEP_ANCHORS | RE_CARET_ANCHORS_HERE)) &&
- re_string_cur_idx (input) != 0)
- {
- char prev = re_string_peek_byte (input, -1);
- if (!(syntax & RE_NEWLINE_ALT) || prev != '\n')
- break;
- }
- token->type = ANCHOR;
- token->opr.ctx_type = LINE_FIRST;
- break;
- case '$':
- if (!(syntax & RE_CONTEXT_INDEP_ANCHORS) &&
- re_string_cur_idx (input) + 1 != re_string_length (input))
- {
- re_token_t next;
- re_string_skip_bytes (input, 1);
- peek_token (&next, input, syntax);
- re_string_skip_bytes (input, -1);
- if (next.type != OP_ALT && next.type != OP_CLOSE_SUBEXP)
- break;
- }
- token->type = ANCHOR;
- token->opr.ctx_type = LINE_LAST;
- break;
- default:
- break;
- }
- return 1;
-}
-
-/* Peek a token from INPUT, and return the length of the token.
- We must not use this function out of bracket expressions. */
-
-static int
-internal_function
-peek_token_bracket (re_token_t *token, re_string_t *input, reg_syntax_t syntax)
-{
- unsigned char c;
- if (re_string_eoi (input))
- {
- token->type = END_OF_RE;
- return 0;
- }
- c = re_string_peek_byte (input, 0);
- token->opr.c = c;
-
-#ifdef RE_ENABLE_I18N
- if (input->mb_cur_max > 1 &&
- !re_string_first_byte (input, re_string_cur_idx (input)))
- {
- token->type = CHARACTER;
- return 1;
- }
-#endif /* RE_ENABLE_I18N */
-
- if (c == '\\' && (syntax & RE_BACKSLASH_ESCAPE_IN_LISTS)
- && re_string_cur_idx (input) + 1 < re_string_length (input))
- {
- /* In this case, '\' escape a character. */
- unsigned char c2;
- re_string_skip_bytes (input, 1);
- c2 = re_string_peek_byte (input, 0);
- token->opr.c = c2;
- token->type = CHARACTER;
- return 1;
- }
- if (c == '[') /* '[' is a special char in a bracket exps. */
- {
- unsigned char c2;
- int token_len;
- if (re_string_cur_idx (input) + 1 < re_string_length (input))
- c2 = re_string_peek_byte (input, 1);
- else
- c2 = 0;
- token->opr.c = c2;
- token_len = 2;
- switch (c2)
- {
- case '.':
- token->type = OP_OPEN_COLL_ELEM;
- break;
- case '=':
- token->type = OP_OPEN_EQUIV_CLASS;
- break;
- case ':':
- if (syntax & RE_CHAR_CLASSES)
- {
- token->type = OP_OPEN_CHAR_CLASS;
- break;
- }
- /* else fall through. */
- default:
- token->type = CHARACTER;
- token->opr.c = c;
- token_len = 1;
- break;
- }
- return token_len;
- }
- switch (c)
- {
- case '-':
- token->type = OP_CHARSET_RANGE;
- break;
- case ']':
- token->type = OP_CLOSE_BRACKET;
- break;
- case '^':
- token->type = OP_NON_MATCH_LIST;
- break;
- default:
- token->type = CHARACTER;
- }
- return 1;
-}
-
-/* Functions for parser. */
-
-/* Entry point of the parser.
- Parse the regular expression REGEXP and return the structure tree.
- If an error is occured, ERR is set by error code, and return NULL.
- This function build the following tree, from regular expression <reg_exp>:
- CAT
- / \
- / \
- <reg_exp> EOR
-
- CAT means concatenation.
- EOR means end of regular expression. */
-
-static bin_tree_t *
-parse (re_string_t *regexp, regex_t *preg, reg_syntax_t syntax,
- reg_errcode_t *err)
-{
- re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
- bin_tree_t *tree, *eor, *root;
- re_token_t current_token;
- dfa->syntax = syntax;
- fetch_token (¤t_token, regexp, syntax | RE_CARET_ANCHORS_HERE);
- tree = parse_reg_exp (regexp, preg, ¤t_token, syntax, 0, err);
- if (BE (*err != REG_NOERROR && tree == NULL, 0))
- return NULL;
- eor = create_tree (dfa, NULL, NULL, END_OF_RE);
- if (tree != NULL)
- root = create_tree (dfa, tree, eor, CONCAT);
- else
- root = eor;
- if (BE (eor == NULL || root == NULL, 0))
- {
- *err = REG_ESPACE;
- return NULL;
- }
- return root;
-}
-
-/* This function build the following tree, from regular expression
- <branch1>|<branch2>:
- ALT
- / \
- / \
- <branch1> <branch2>
-
- ALT means alternative, which represents the operator `|'. */
-
-static bin_tree_t *
-parse_reg_exp (re_string_t *regexp, regex_t *preg, re_token_t *token,
- reg_syntax_t syntax, int nest, reg_errcode_t *err)
-{
- re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
- bin_tree_t *tree, *branch = NULL;
- tree = parse_branch (regexp, preg, token, syntax, nest, err);
- if (BE (*err != REG_NOERROR && tree == NULL, 0))
- return NULL;
-
- while (token->type == OP_ALT)
- {
- fetch_token (token, regexp, syntax | RE_CARET_ANCHORS_HERE);
- if (token->type != OP_ALT && token->type != END_OF_RE
- && (nest == 0 || token->type != OP_CLOSE_SUBEXP))
- {
- branch = parse_branch (regexp, preg, token, syntax, nest, err);
- if (BE (*err != REG_NOERROR && branch == NULL, 0))
- return NULL;
- }
- else
- branch = NULL;
- tree = create_tree (dfa, tree, branch, OP_ALT);
- if (BE (tree == NULL, 0))
- {
- *err = REG_ESPACE;
- return NULL;
- }
- }
- return tree;
-}
-
-/* This function build the following tree, from regular expression
- <exp1><exp2>:
- CAT
- / \
- / \
- <exp1> <exp2>
-
- CAT means concatenation. */
-
-static bin_tree_t *
-parse_branch (re_string_t *regexp, regex_t *preg, re_token_t *token,
- reg_syntax_t syntax, int nest, reg_errcode_t *err)
-{
- bin_tree_t *tree, *exp;
- re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
- tree = parse_expression (regexp, preg, token, syntax, nest, err);
- if (BE (*err != REG_NOERROR && tree == NULL, 0))
- return NULL;
-
- while (token->type != OP_ALT && token->type != END_OF_RE
- && (nest == 0 || token->type != OP_CLOSE_SUBEXP))
- {
- exp = parse_expression (regexp, preg, token, syntax, nest, err);
- if (BE (*err != REG_NOERROR && exp == NULL, 0))
- {
- return NULL;
- }
- if (tree != NULL && exp != NULL)
- {
- tree = create_tree (dfa, tree, exp, CONCAT);
- if (tree == NULL)
- {
- *err = REG_ESPACE;
- return NULL;
- }
- }
- else if (tree == NULL)
- tree = exp;
- /* Otherwise exp == NULL, we don't need to create new tree. */
- }
- return tree;
-}
-
-/* This function build the following tree, from regular expression a*:
- *
- |
- a
-*/
-
-static bin_tree_t *
-parse_expression (re_string_t *regexp, regex_t *preg, re_token_t *token,
- reg_syntax_t syntax, int nest, reg_errcode_t *err)
-{
- re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
- bin_tree_t *tree;
- switch (token->type)
- {
- case CHARACTER:
- tree = create_token_tree (dfa, NULL, NULL, token);
- if (BE (tree == NULL, 0))
- {
- *err = REG_ESPACE;
- return NULL;
- }
-#ifdef RE_ENABLE_I18N
- if (dfa->mb_cur_max > 1)
- {
- while (!re_string_eoi (regexp)
- && !re_string_first_byte (regexp, re_string_cur_idx (regexp)))
- {
- bin_tree_t *mbc_remain;
- fetch_token (token, regexp, syntax);
- mbc_remain = create_token_tree (dfa, NULL, NULL, token);
- tree = create_tree (dfa, tree, mbc_remain, CONCAT);
- if (BE (mbc_remain == NULL || tree == NULL, 0))
- {
- *err = REG_ESPACE;
- return NULL;
- }
- }
- }
-#endif
- break;
- case OP_OPEN_SUBEXP:
- tree = parse_sub_exp (regexp, preg, token, syntax, nest + 1, err);
- if (BE (*err != REG_NOERROR && tree == NULL, 0))
- return NULL;
- break;
- case OP_OPEN_BRACKET:
- tree = parse_bracket_exp (regexp, dfa, token, syntax, err);
- if (BE (*err != REG_NOERROR && tree == NULL, 0))
- return NULL;
- break;
- case OP_BACK_REF:
- if (!BE (dfa->completed_bkref_map & (1 << token->opr.idx), 1))
- {
- *err = REG_ESUBREG;
- return NULL;
- }
- dfa->used_bkref_map |= 1 << token->opr.idx;
- tree = create_token_tree (dfa, NULL, NULL, token);
- if (BE (tree == NULL, 0))
- {
- *err = REG_ESPACE;
- return NULL;
- }
- ++dfa->nbackref;
- dfa->has_mb_node = 1;
- break;
- case OP_OPEN_DUP_NUM:
- if (syntax & RE_CONTEXT_INVALID_DUP)
- {
- *err = REG_BADRPT;
- return NULL;
- }
- /* FALLTHROUGH */
- case OP_DUP_ASTERISK:
- case OP_DUP_PLUS:
- case OP_DUP_QUESTION:
- if (syntax & RE_CONTEXT_INVALID_OPS)
- {
- *err = REG_BADRPT;
- return NULL;
- }
- else if (syntax & RE_CONTEXT_INDEP_OPS)
- {
- fetch_token (token, regexp, syntax);
- return parse_expression (regexp, preg, token, syntax, nest, err);
- }
- /* else fall through */
- case OP_CLOSE_SUBEXP:
- if ((token->type == OP_CLOSE_SUBEXP) &&
- !(syntax & RE_UNMATCHED_RIGHT_PAREN_ORD))
- {
- *err = REG_ERPAREN;
- return NULL;
- }
- /* else fall through */
- case OP_CLOSE_DUP_NUM:
- /* We treat it as a normal character. */
-
- /* Then we can these characters as normal characters. */
- token->type = CHARACTER;
- /* mb_partial and word_char bits should be initialized already
- by peek_token. */
- tree = create_token_tree (dfa, NULL, NULL, token);
- if (BE (tree == NULL, 0))
- {
- *err = REG_ESPACE;
- return NULL;
- }
- break;
- case ANCHOR:
- if ((token->opr.ctx_type
- & (WORD_DELIM | NOT_WORD_DELIM | WORD_FIRST | WORD_LAST))
- && dfa->word_ops_used == 0)
- init_word_char (dfa);
- if (token->opr.ctx_type == WORD_DELIM
- || token->opr.ctx_type == NOT_WORD_DELIM)
- {
- bin_tree_t *tree_first, *tree_last;
- if (token->opr.ctx_type == WORD_DELIM)
- {
- token->opr.ctx_type = WORD_FIRST;
- tree_first = create_token_tree (dfa, NULL, NULL, token);
- token->opr.ctx_type = WORD_LAST;
- }
- else
- {
- token->opr.ctx_type = INSIDE_WORD;
- tree_first = create_token_tree (dfa, NULL, NULL, token);
- token->opr.ctx_type = INSIDE_NOTWORD;
- }
- tree_last = create_token_tree (dfa, NULL, NULL, token);
- tree = create_tree (dfa, tree_first, tree_last, OP_ALT);
- if (BE (tree_first == NULL || tree_last == NULL || tree == NULL, 0))
- {
- *err = REG_ESPACE;
- return NULL;
- }
- }
- else
- {
- tree = create_token_tree (dfa, NULL, NULL, token);
- if (BE (tree == NULL, 0))
- {
- *err = REG_ESPACE;
- return NULL;
- }
- }
- /* We must return here, since ANCHORs can't be followed
- by repetition operators.
- eg. RE"^*" is invalid or "<ANCHOR(^)><CHAR(*)>",
- it must not be "<ANCHOR(^)><REPEAT(*)>". */
- fetch_token (token, regexp, syntax);
- return tree;
- case OP_PERIOD:
- tree = create_token_tree (dfa, NULL, NULL, token);
- if (BE (tree == NULL, 0))
- {
- *err = REG_ESPACE;
- return NULL;
- }
- if (dfa->mb_cur_max > 1)
- dfa->has_mb_node = 1;
- break;
- case OP_WORD:
- case OP_NOTWORD:
- tree = build_charclass_op (dfa, regexp->trans,
- (const unsigned char *) "alnum",
- (const unsigned char *) "_",
- token->type == OP_NOTWORD, err);
- if (BE (*err != REG_NOERROR && tree == NULL, 0))
- return NULL;
- break;
- case OP_SPACE:
- case OP_NOTSPACE:
- tree = build_charclass_op (dfa, regexp->trans,
- (const unsigned char *) "space",
- (const unsigned char *) "",
- token->type == OP_NOTSPACE, err);
- if (BE (*err != REG_NOERROR && tree == NULL, 0))
- return NULL;
- break;
- case OP_ALT:
- case END_OF_RE:
- return NULL;
- case BACK_SLASH:
- *err = REG_EESCAPE;
- return NULL;
- default:
- /* Must not happen? */
-#ifdef DEBUG
- assert (0);
-#endif
- return NULL;
- }
- fetch_token (token, regexp, syntax);
-
- while (token->type == OP_DUP_ASTERISK || token->type == OP_DUP_PLUS
- || token->type == OP_DUP_QUESTION || token->type == OP_OPEN_DUP_NUM)
- {
- tree = parse_dup_op (tree, regexp, dfa, token, syntax, err);
- if (BE (*err != REG_NOERROR && tree == NULL, 0))
- return NULL;
- /* In BRE consecutive duplications are not allowed. */
- if ((syntax & RE_CONTEXT_INVALID_DUP)
- && (token->type == OP_DUP_ASTERISK
- || token->type == OP_OPEN_DUP_NUM))
- {
- *err = REG_BADRPT;
- return NULL;
- }
- }
-
- return tree;
-}
-
-/* This function build the following tree, from regular expression
- (<reg_exp>):
- SUBEXP
- |
- <reg_exp>
-*/
-
-static bin_tree_t *
-parse_sub_exp (re_string_t *regexp, regex_t *preg, re_token_t *token,
- reg_syntax_t syntax, int nest, reg_errcode_t *err)
-{
- re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
- bin_tree_t *tree;
- size_t cur_nsub;
- cur_nsub = preg->re_nsub++;
-
- fetch_token (token, regexp, syntax | RE_CARET_ANCHORS_HERE);
-
- /* The subexpression may be a null string. */
- if (token->type == OP_CLOSE_SUBEXP)
- tree = NULL;
- else
- {
- tree = parse_reg_exp (regexp, preg, token, syntax, nest, err);
- if (BE (*err == REG_NOERROR && token->type != OP_CLOSE_SUBEXP, 0))
- *err = REG_EPAREN;
- if (BE (*err != REG_NOERROR, 0))
- return NULL;
- }
-
- if (cur_nsub <= '9' - '1')
- dfa->completed_bkref_map |= 1 << cur_nsub;
-
- tree = create_tree (dfa, tree, NULL, SUBEXP);
- if (BE (tree == NULL, 0))
- {
- *err = REG_ESPACE;
- return NULL;
- }
- tree->token.opr.idx = cur_nsub;
- return tree;
-}
-
-/* This function parse repetition operators like "*", "+", "{1,3}" etc. */
-
-static bin_tree_t *
-parse_dup_op (bin_tree_t *elem, re_string_t *regexp, re_dfa_t *dfa,
- re_token_t *token, reg_syntax_t syntax, reg_errcode_t *err)
-{
- bin_tree_t *tree = NULL, *old_tree = NULL;
- int i, start, end, start_idx = re_string_cur_idx (regexp);
- re_token_t start_token = *token;
-
- if (token->type == OP_OPEN_DUP_NUM)
- {
- end = 0;
- start = fetch_number (regexp, token, syntax);
- if (start == -1)
- {
- if (token->type == CHARACTER && token->opr.c == ',')
- start = 0; /* We treat "{,m}" as "{0,m}". */
- else
- {
- *err = REG_BADBR; /* <re>{} is invalid. */
- return NULL;
- }
- }
- if (BE (start != -2, 1))
- {
- /* We treat "{n}" as "{n,n}". */
- end = ((token->type == OP_CLOSE_DUP_NUM) ? start
- : ((token->type == CHARACTER && token->opr.c == ',')
- ? fetch_number (regexp, token, syntax) : -2));
- }
- if (BE (start == -2 || end == -2, 0))
- {
- /* Invalid sequence. */
- if (BE (!(syntax & RE_INVALID_INTERVAL_ORD), 0))
- {
- if (token->type == END_OF_RE)
- *err = REG_EBRACE;
- else
- *err = REG_BADBR;
-
- return NULL;
- }
-
- /* If the syntax bit is set, rollback. */
- re_string_set_index (regexp, start_idx);
- *token = start_token;
- token->type = CHARACTER;
- /* mb_partial and word_char bits should be already initialized by
- peek_token. */
- return elem;
- }
-
- if (BE ((end != -1 && start > end) || token->type != OP_CLOSE_DUP_NUM, 0))
- {
- /* First number greater than second. */
- *err = REG_BADBR;
- return NULL;
- }
- }
- else
- {
- start = (token->type == OP_DUP_PLUS) ? 1 : 0;
- end = (token->type == OP_DUP_QUESTION) ? 1 : -1;
- }
-
- fetch_token (token, regexp, syntax);
-
- if (BE (elem == NULL, 0))
- return NULL;
- if (BE (start == 0 && end == 0, 0))
- {
- postorder (elem, free_tree, NULL);
- return NULL;
- }
-
- /* Extract "<re>{n,m}" to "<re><re>...<re><re>{0,<m-n>}". */
- if (BE (start > 0, 0))
- {
- tree = elem;
- for (i = 2; i <= start; ++i)
- {
- elem = duplicate_tree (elem, dfa);
- tree = create_tree (dfa, tree, elem, CONCAT);
- if (BE (elem == NULL || tree == NULL, 0))
- goto parse_dup_op_espace;
- }
-
- if (start == end)
- return tree;
-
- /* Duplicate ELEM before it is marked optional. */
- elem = duplicate_tree (elem, dfa);
- old_tree = tree;
- }
- else
- old_tree = NULL;
-
- if (elem->token.type == SUBEXP)
- postorder (elem, mark_opt_subexp, (void *) (long) elem->token.opr.idx);
-
- tree = create_tree (dfa, elem, NULL, (end == -1 ? OP_DUP_ASTERISK : OP_ALT));
- if (BE (tree == NULL, 0))
- goto parse_dup_op_espace;
-
- /* This loop is actually executed only when end != -1,
- to rewrite <re>{0,n} as (<re>(<re>...<re>?)?)?... We have
- already created the start+1-th copy. */
- for (i = start + 2; i <= end; ++i)
- {
- elem = duplicate_tree (elem, dfa);
- tree = create_tree (dfa, tree, elem, CONCAT);
- if (BE (elem == NULL || tree == NULL, 0))
- goto parse_dup_op_espace;
-
- tree = create_tree (dfa, tree, NULL, OP_ALT);
- if (BE (tree == NULL, 0))
- goto parse_dup_op_espace;
- }
-
- if (old_tree)
- tree = create_tree (dfa, old_tree, tree, CONCAT);
-
- return tree;
-
- parse_dup_op_espace:
- *err = REG_ESPACE;
- return NULL;
-}
-
-/* Size of the names for collating symbol/equivalence_class/character_class.
- I'm not sure, but maybe enough. */
-#define BRACKET_NAME_BUF_SIZE 32
-
-#ifndef _LIBC
- /* Local function for parse_bracket_exp only used in case of NOT _LIBC.
- Build the range expression which starts from START_ELEM, and ends
- at END_ELEM. The result are written to MBCSET and SBCSET.
- RANGE_ALLOC is the allocated size of mbcset->range_starts, and
- mbcset->range_ends, is a pointer argument sinse we may
- update it. */
-
-static reg_errcode_t
-internal_function
-# ifdef RE_ENABLE_I18N
-build_range_exp (bitset_t sbcset, re_charset_t *mbcset, int *range_alloc,
- bracket_elem_t *start_elem, bracket_elem_t *end_elem)
-# else /* not RE_ENABLE_I18N */
-build_range_exp (bitset_t sbcset, bracket_elem_t *start_elem,
- bracket_elem_t *end_elem)
-# endif /* not RE_ENABLE_I18N */
-{
- unsigned int start_ch, end_ch;
- /* Equivalence Classes and Character Classes can't be a range start/end. */
- if (BE (start_elem->type == EQUIV_CLASS || start_elem->type == CHAR_CLASS
- || end_elem->type == EQUIV_CLASS || end_elem->type == CHAR_CLASS,
- 0))
- return REG_ERANGE;
-
- /* We can handle no multi character collating elements without libc
- support. */
- if (BE ((start_elem->type == COLL_SYM
- && strlen ((char *) start_elem->opr.name) > 1)
- || (end_elem->type == COLL_SYM
- && strlen ((char *) end_elem->opr.name) > 1), 0))
- return REG_ECOLLATE;
-
-# ifdef RE_ENABLE_I18N
- {
- wchar_t wc;
- wint_t start_wc;
- wint_t end_wc;
- wchar_t cmp_buf[6] = {L'\0', L'\0', L'\0', L'\0', L'\0', L'\0'};
-
- start_ch = ((start_elem->type == SB_CHAR) ? start_elem->opr.ch
- : ((start_elem->type == COLL_SYM) ? start_elem->opr.name[0]
- : 0));
- end_ch = ((end_elem->type == SB_CHAR) ? end_elem->opr.ch
- : ((end_elem->type == COLL_SYM) ? end_elem->opr.name[0]
- : 0));
- start_wc = ((start_elem->type == SB_CHAR || start_elem->type == COLL_SYM)
- ? __btowc (start_ch) : start_elem->opr.wch);
- end_wc = ((end_elem->type == SB_CHAR || end_elem->type == COLL_SYM)
- ? __btowc (end_ch) : end_elem->opr.wch);
- if (start_wc == WEOF || end_wc == WEOF)
- return REG_ECOLLATE;
- cmp_buf[0] = start_wc;
- cmp_buf[4] = end_wc;
- if (wcscoll (cmp_buf, cmp_buf + 4) > 0)
- return REG_ERANGE;
-
- /* Got valid collation sequence values, add them as a new entry.
- However, for !_LIBC we have no collation elements: if the
- character set is single byte, the single byte character set
- that we build below suffices. parse_bracket_exp passes
- no MBCSET if dfa->mb_cur_max == 1. */
- if (mbcset)
- {
- /* Check the space of the arrays. */
- if (BE (*range_alloc == mbcset->nranges, 0))
- {
- /* There is not enough space, need realloc. */
- wchar_t *new_array_start, *new_array_end;
- int new_nranges;
-
- /* +1 in case of mbcset->nranges is 0. */
- new_nranges = 2 * mbcset->nranges + 1;
- /* Use realloc since mbcset->range_starts and mbcset->range_ends
- are NULL if *range_alloc == 0. */
- new_array_start = re_realloc (mbcset->range_starts, wchar_t,
- new_nranges);
- new_array_end = re_realloc (mbcset->range_ends, wchar_t,
- new_nranges);
-
- if (BE (new_array_start == NULL || new_array_end == NULL, 0))
- return REG_ESPACE;
-
- mbcset->range_starts = new_array_start;
- mbcset->range_ends = new_array_end;
- *range_alloc = new_nranges;
- }
-
- mbcset->range_starts[mbcset->nranges] = start_wc;
- mbcset->range_ends[mbcset->nranges++] = end_wc;
- }
-
- /* Build the table for single byte characters. */
- for (wc = 0; wc < SBC_MAX; ++wc)
- {
- cmp_buf[2] = wc;
- if (wcscoll (cmp_buf, cmp_buf + 2) <= 0
- && wcscoll (cmp_buf + 2, cmp_buf + 4) <= 0)
- bitset_set (sbcset, wc);
- }
- }
-# else /* not RE_ENABLE_I18N */
- {
- unsigned int ch;
- start_ch = ((start_elem->type == SB_CHAR ) ? start_elem->opr.ch
- : ((start_elem->type == COLL_SYM) ? start_elem->opr.name[0]
- : 0));
- end_ch = ((end_elem->type == SB_CHAR ) ? end_elem->opr.ch
- : ((end_elem->type == COLL_SYM) ? end_elem->opr.name[0]
- : 0));
- if (start_ch > end_ch)
- return REG_ERANGE;
- /* Build the table for single byte characters. */
- for (ch = 0; ch < SBC_MAX; ++ch)
- if (start_ch <= ch && ch <= end_ch)
- bitset_set (sbcset, ch);
- }
-# endif /* not RE_ENABLE_I18N */
- return REG_NOERROR;
-}
-#endif /* not _LIBC */
-
-#ifndef _LIBC
-/* Helper function for parse_bracket_exp only used in case of NOT _LIBC..
- Build the collating element which is represented by NAME.
- The result are written to MBCSET and SBCSET.
- COLL_SYM_ALLOC is the allocated size of mbcset->coll_sym, is a
- pointer argument since we may update it. */
-
-static reg_errcode_t
-internal_function
-# ifdef RE_ENABLE_I18N
-build_collating_symbol (bitset_t sbcset, re_charset_t *mbcset,
- int *coll_sym_alloc, const unsigned char *name)
-# else /* not RE_ENABLE_I18N */
-build_collating_symbol (bitset_t sbcset, const unsigned char *name)
-# endif /* not RE_ENABLE_I18N */
-{
- size_t name_len = strlen ((const char *) name);
- if (BE (name_len != 1, 0))
- return REG_ECOLLATE;
- else
- {
- bitset_set (sbcset, name[0]);
- return REG_NOERROR;
- }
-}
-#endif /* not _LIBC */
-
-/* This function parse bracket expression like "[abc]", "[a-c]",
- "[[.a-a.]]" etc. */
-
-static bin_tree_t *
-parse_bracket_exp (re_string_t *regexp, re_dfa_t *dfa, re_token_t *token,
- reg_syntax_t syntax, reg_errcode_t *err)
-{
-#ifdef _LIBC
- const unsigned char *collseqmb;
- const char *collseqwc;
- uint32_t nrules;
- int32_t table_size;
- const int32_t *symb_table;
- const unsigned char *extra;
-
- /* Local function for parse_bracket_exp used in _LIBC environement.
- Seek the collating symbol entry correspondings to NAME.
- Return the index of the symbol in the SYMB_TABLE. */
-
- auto inline int32_t
- __attribute ((always_inline))
- seek_collating_symbol_entry (name, name_len)
- const unsigned char *name;
- size_t name_len;
- {
- int32_t hash = elem_hash ((const char *) name, name_len);
- int32_t elem = hash % table_size;
- if (symb_table[2 * elem] != 0)
- {
- int32_t second = hash % (table_size - 2) + 1;
-
- do
- {
- /* First compare the hashing value. */
- if (symb_table[2 * elem] == hash
- /* Compare the length of the name. */
- && name_len == extra[symb_table[2 * elem + 1]]
- /* Compare the name. */
- && memcmp (name, &extra[symb_table[2 * elem + 1] + 1],
- name_len) == 0)
- {
- /* Yep, this is the entry. */
- break;
- }
-
- /* Next entry. */
- elem += second;
- }
- while (symb_table[2 * elem] != 0);
- }
- return elem;
- }
-
- /* Local function for parse_bracket_exp used in _LIBC environment.
- Look up the collation sequence value of BR_ELEM.
- Return the value if succeeded, UINT_MAX otherwise. */
-
- auto inline unsigned int
- __attribute ((always_inline))
- lookup_collation_sequence_value (br_elem)
- bracket_elem_t *br_elem;
- {
- if (br_elem->type == SB_CHAR)
- {
- /*
- if (MB_CUR_MAX == 1)
- */
- if (nrules == 0)
- return collseqmb[br_elem->opr.ch];
- else
- {
- wint_t wc = __btowc (br_elem->opr.ch);
- return __collseq_table_lookup (collseqwc, wc);
- }
- }
- else if (br_elem->type == MB_CHAR)
- {
- if (nrules != 0)
- return __collseq_table_lookup (collseqwc, br_elem->opr.wch);
- }
- else if (br_elem->type == COLL_SYM)
- {
- size_t sym_name_len = strlen ((char *) br_elem->opr.name);
- if (nrules != 0)
- {
- int32_t elem, idx;
- elem = seek_collating_symbol_entry (br_elem->opr.name,
- sym_name_len);
- if (symb_table[2 * elem] != 0)
- {
- /* We found the entry. */
- idx = symb_table[2 * elem + 1];
- /* Skip the name of collating element name. */
- idx += 1 + extra[idx];
- /* Skip the byte sequence of the collating element. */
- idx += 1 + extra[idx];
- /* Adjust for the alignment. */
- idx = (idx + 3) & ~3;
- /* Skip the multibyte collation sequence value. */
- idx += sizeof (unsigned int);
- /* Skip the wide char sequence of the collating element. */
- idx += sizeof (unsigned int) *
- (1 + *(unsigned int *) (extra + idx));
- /* Return the collation sequence value. */
- return *(unsigned int *) (extra + idx);
- }
- else if (symb_table[2 * elem] == 0 && sym_name_len == 1)
- {
- /* No valid character. Match it as a single byte
- character. */
- return collseqmb[br_elem->opr.name[0]];
- }
- }
- else if (sym_name_len == 1)
- return collseqmb[br_elem->opr.name[0]];
- }
- return UINT_MAX;
- }
-
- /* Local function for parse_bracket_exp used in _LIBC environement.
- Build the range expression which starts from START_ELEM, and ends
- at END_ELEM. The result are written to MBCSET and SBCSET.
- RANGE_ALLOC is the allocated size of mbcset->range_starts, and
- mbcset->range_ends, is a pointer argument sinse we may
- update it. */
-
- auto inline reg_errcode_t
- __attribute ((always_inline))
- build_range_exp (sbcset, mbcset, range_alloc, start_elem, end_elem)
- re_charset_t *mbcset;
- int *range_alloc;
- bitset_t sbcset;
- bracket_elem_t *start_elem, *end_elem;
- {
- unsigned int ch;
- uint32_t start_collseq;
- uint32_t end_collseq;
-
- /* Equivalence Classes and Character Classes can't be a range
- start/end. */
- if (BE (start_elem->type == EQUIV_CLASS || start_elem->type == CHAR_CLASS
- || end_elem->type == EQUIV_CLASS || end_elem->type == CHAR_CLASS,
- 0))
- return REG_ERANGE;
-
- start_collseq = lookup_collation_sequence_value (start_elem);
- end_collseq = lookup_collation_sequence_value (end_elem);
- /* Check start/end collation sequence values. */
- if (BE (start_collseq == UINT_MAX || end_collseq == UINT_MAX, 0))
- return REG_ECOLLATE;
- if (BE ((syntax & RE_NO_EMPTY_RANGES) && start_collseq > end_collseq, 0))
- return REG_ERANGE;
-
- /* Got valid collation sequence values, add them as a new entry.
- However, if we have no collation elements, and the character set
- is single byte, the single byte character set that we
- build below suffices. */
- if (nrules > 0 || dfa->mb_cur_max > 1)
- {
- /* Check the space of the arrays. */
- if (BE (*range_alloc == mbcset->nranges, 0))
- {
- /* There is not enough space, need realloc. */
- uint32_t *new_array_start;
- uint32_t *new_array_end;
- int new_nranges;
-
- /* +1 in case of mbcset->nranges is 0. */
- new_nranges = 2 * mbcset->nranges + 1;
- new_array_start = re_realloc (mbcset->range_starts, uint32_t,
- new_nranges);
- new_array_end = re_realloc (mbcset->range_ends, uint32_t,
- new_nranges);
-
- if (BE (new_array_start == NULL || new_array_end == NULL, 0))
- return REG_ESPACE;
-
- mbcset->range_starts = new_array_start;
- mbcset->range_ends = new_array_end;
- *range_alloc = new_nranges;
- }
-
- mbcset->range_starts[mbcset->nranges] = start_collseq;
- mbcset->range_ends[mbcset->nranges++] = end_collseq;
- }
-
- /* Build the table for single byte characters. */
- for (ch = 0; ch < SBC_MAX; ch++)
- {
- uint32_t ch_collseq;
- /*
- if (MB_CUR_MAX == 1)
- */
- if (nrules == 0)
- ch_collseq = collseqmb[ch];
- else
- ch_collseq = __collseq_table_lookup (collseqwc, __btowc (ch));
- if (start_collseq <= ch_collseq && ch_collseq <= end_collseq)
- bitset_set (sbcset, ch);
- }
- return REG_NOERROR;
- }
-
- /* Local function for parse_bracket_exp used in _LIBC environement.
- Build the collating element which is represented by NAME.
- The result are written to MBCSET and SBCSET.
- COLL_SYM_ALLOC is the allocated size of mbcset->coll_sym, is a
- pointer argument sinse we may update it. */
-
- auto inline reg_errcode_t
- __attribute ((always_inline))
- build_collating_symbol (sbcset, mbcset, coll_sym_alloc, name)
- re_charset_t *mbcset;
- int *coll_sym_alloc;
- bitset_t sbcset;
- const unsigned char *name;
- {
- int32_t elem, idx;
- size_t name_len = strlen ((const char *) name);
- if (nrules != 0)
- {
- elem = seek_collating_symbol_entry (name, name_len);
- if (symb_table[2 * elem] != 0)
- {
- /* We found the entry. */
- idx = symb_table[2 * elem + 1];
- /* Skip the name of collating element name. */
- idx += 1 + extra[idx];
- }
- else if (symb_table[2 * elem] == 0 && name_len == 1)
- {
- /* No valid character, treat it as a normal
- character. */
- bitset_set (sbcset, name[0]);
- return REG_NOERROR;
- }
- else
- return REG_ECOLLATE;
-
- /* Got valid collation sequence, add it as a new entry. */
- /* Check the space of the arrays. */
- if (BE (*coll_sym_alloc == mbcset->ncoll_syms, 0))
- {
- /* Not enough, realloc it. */
- /* +1 in case of mbcset->ncoll_syms is 0. */
- int new_coll_sym_alloc = 2 * mbcset->ncoll_syms + 1;
- /* Use realloc since mbcset->coll_syms is NULL
- if *alloc == 0. */
- int32_t *new_coll_syms = re_realloc (mbcset->coll_syms, int32_t,
- new_coll_sym_alloc);
- if (BE (new_coll_syms == NULL, 0))
- return REG_ESPACE;
- mbcset->coll_syms = new_coll_syms;
- *coll_sym_alloc = new_coll_sym_alloc;
- }
- mbcset->coll_syms[mbcset->ncoll_syms++] = idx;
- return REG_NOERROR;
- }
- else
- {
- if (BE (name_len != 1, 0))
- return REG_ECOLLATE;
- else
- {
- bitset_set (sbcset, name[0]);
- return REG_NOERROR;
- }
- }
- }
-#endif
-
- re_token_t br_token;
- re_bitset_ptr_t sbcset;
-#ifdef RE_ENABLE_I18N
- re_charset_t *mbcset;
- int coll_sym_alloc = 0, range_alloc = 0, mbchar_alloc = 0;
- int equiv_class_alloc = 0, char_class_alloc = 0;
-#endif /* not RE_ENABLE_I18N */
- int non_match = 0;
- bin_tree_t *work_tree;
- int token_len;
- int first_round = 1;
-#ifdef _LIBC
- collseqmb = (const unsigned char *)
- _NL_CURRENT (LC_COLLATE, _NL_COLLATE_COLLSEQMB);
- nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
- if (nrules)
- {
- /*
- if (MB_CUR_MAX > 1)
- */
- collseqwc = _NL_CURRENT (LC_COLLATE, _NL_COLLATE_COLLSEQWC);
- table_size = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_SYMB_HASH_SIZEMB);
- symb_table = (const int32_t *) _NL_CURRENT (LC_COLLATE,
- _NL_COLLATE_SYMB_TABLEMB);
- extra = (const unsigned char *) _NL_CURRENT (LC_COLLATE,
- _NL_COLLATE_SYMB_EXTRAMB);
- }
-#endif
- sbcset = (re_bitset_ptr_t) calloc (sizeof (bitset_t), 1);
-#ifdef RE_ENABLE_I18N
- mbcset = (re_charset_t *) calloc (sizeof (re_charset_t), 1);
-#endif /* RE_ENABLE_I18N */
-#ifdef RE_ENABLE_I18N
- if (BE (sbcset == NULL || mbcset == NULL, 0))
-#else
- if (BE (sbcset == NULL, 0))
-#endif /* RE_ENABLE_I18N */
- {
- *err = REG_ESPACE;
- return NULL;
- }
-
- token_len = peek_token_bracket (token, regexp, syntax);
- if (BE (token->type == END_OF_RE, 0))
- {
- *err = REG_BADPAT;
- goto parse_bracket_exp_free_return;
- }
- if (token->type == OP_NON_MATCH_LIST)
- {
-#ifdef RE_ENABLE_I18N
- mbcset->non_match = 1;
-#endif /* not RE_ENABLE_I18N */
- non_match = 1;
- if (syntax & RE_HAT_LISTS_NOT_NEWLINE)
- bitset_set (sbcset, '\n');
- re_string_skip_bytes (regexp, token_len); /* Skip a token. */
- token_len = peek_token_bracket (token, regexp, syntax);
- if (BE (token->type == END_OF_RE, 0))
- {
- *err = REG_BADPAT;
- goto parse_bracket_exp_free_return;
- }
- }
-
- /* We treat the first ']' as a normal character. */
- if (token->type == OP_CLOSE_BRACKET)
- token->type = CHARACTER;
-
- while (1)
- {
- bracket_elem_t start_elem, end_elem;
- unsigned char start_name_buf[BRACKET_NAME_BUF_SIZE];
- unsigned char end_name_buf[BRACKET_NAME_BUF_SIZE];
- reg_errcode_t ret;
- int token_len2 = 0, is_range_exp = 0;
- re_token_t token2;
-
- start_elem.opr.name = start_name_buf;
- ret = parse_bracket_element (&start_elem, regexp, token, token_len, dfa,
- syntax, first_round);
- if (BE (ret != REG_NOERROR, 0))
- {
- *err = ret;
- goto parse_bracket_exp_free_return;
- }
- first_round = 0;
-
- /* Get information about the next token. We need it in any case. */
- token_len = peek_token_bracket (token, regexp, syntax);
-
- /* Do not check for ranges if we know they are not allowed. */
- if (start_elem.type != CHAR_CLASS && start_elem.type != EQUIV_CLASS)
- {
- if (BE (token->type == END_OF_RE, 0))
- {
- *err = REG_EBRACK;
- goto parse_bracket_exp_free_return;
- }
- if (token->type == OP_CHARSET_RANGE)
- {
- re_string_skip_bytes (regexp, token_len); /* Skip '-'. */
- token_len2 = peek_token_bracket (&token2, regexp, syntax);
- if (BE (token2.type == END_OF_RE, 0))
- {
- *err = REG_EBRACK;
- goto parse_bracket_exp_free_return;
- }
- if (token2.type == OP_CLOSE_BRACKET)
- {
- /* We treat the last '-' as a normal character. */
- re_string_skip_bytes (regexp, -token_len);
- token->type = CHARACTER;
- }
- else
- is_range_exp = 1;
- }
- }
-
- if (is_range_exp == 1)
- {
- end_elem.opr.name = end_name_buf;
- ret = parse_bracket_element (&end_elem, regexp, &token2, token_len2,
- dfa, syntax, 1);
- if (BE (ret != REG_NOERROR, 0))
- {
- *err = ret;
- goto parse_bracket_exp_free_return;
- }
-
- token_len = peek_token_bracket (token, regexp, syntax);
-
-#ifdef _LIBC
- *err = build_range_exp (sbcset, mbcset, &range_alloc,
- &start_elem, &end_elem);
-#else
-# ifdef RE_ENABLE_I18N
- *err = build_range_exp (sbcset,
- dfa->mb_cur_max > 1 ? mbcset : NULL,
- &range_alloc, &start_elem, &end_elem);
-# else
- *err = build_range_exp (sbcset, &start_elem, &end_elem);
-# endif
-#endif /* RE_ENABLE_I18N */
- if (BE (*err != REG_NOERROR, 0))
- goto parse_bracket_exp_free_return;
- }
- else
- {
- switch (start_elem.type)
- {
- case SB_CHAR:
- bitset_set (sbcset, start_elem.opr.ch);
- break;
-#ifdef RE_ENABLE_I18N
- case MB_CHAR:
- /* Check whether the array has enough space. */
- if (BE (mbchar_alloc == mbcset->nmbchars, 0))
- {
- wchar_t *new_mbchars;
- /* Not enough, realloc it. */
- /* +1 in case of mbcset->nmbchars is 0. */
- mbchar_alloc = 2 * mbcset->nmbchars + 1;
- /* Use realloc since array is NULL if *alloc == 0. */
- new_mbchars = re_realloc (mbcset->mbchars, wchar_t,
- mbchar_alloc);
- if (BE (new_mbchars == NULL, 0))
- goto parse_bracket_exp_espace;
- mbcset->mbchars = new_mbchars;
- }
- mbcset->mbchars[mbcset->nmbchars++] = start_elem.opr.wch;
- break;
-#endif /* RE_ENABLE_I18N */
- case EQUIV_CLASS:
- *err = build_equiv_class (sbcset,
-#ifdef RE_ENABLE_I18N
- mbcset, &equiv_class_alloc,
-#endif /* RE_ENABLE_I18N */
- start_elem.opr.name);
- if (BE (*err != REG_NOERROR, 0))
- goto parse_bracket_exp_free_return;
- break;
- case COLL_SYM:
- *err = build_collating_symbol (sbcset,
-#ifdef RE_ENABLE_I18N
- mbcset, &coll_sym_alloc,
-#endif /* RE_ENABLE_I18N */
- start_elem.opr.name);
- if (BE (*err != REG_NOERROR, 0))
- goto parse_bracket_exp_free_return;
- break;
- case CHAR_CLASS:
- *err = build_charclass (regexp->trans, sbcset,
-#ifdef RE_ENABLE_I18N
- mbcset, &char_class_alloc,
-#endif /* RE_ENABLE_I18N */
- start_elem.opr.name, syntax);
- if (BE (*err != REG_NOERROR, 0))
- goto parse_bracket_exp_free_return;
- break;
- default:
- assert (0);
- break;
- }
- }
- if (BE (token->type == END_OF_RE, 0))
- {
- *err = REG_EBRACK;
- goto parse_bracket_exp_free_return;
- }
- if (token->type == OP_CLOSE_BRACKET)
- break;
- }
-
- re_string_skip_bytes (regexp, token_len); /* Skip a token. */
-
- /* If it is non-matching list. */
- if (non_match)
- bitset_not (sbcset);
-
-#ifdef RE_ENABLE_I18N
- /* Ensure only single byte characters are set. */
- if (dfa->mb_cur_max > 1)
- bitset_mask (sbcset, dfa->sb_char);
-
- if (mbcset->nmbchars || mbcset->ncoll_syms || mbcset->nequiv_classes
- || mbcset->nranges || (dfa->mb_cur_max > 1 && (mbcset->nchar_classes
- || mbcset->non_match)))
- {
- bin_tree_t *mbc_tree;
- int sbc_idx;
- /* Build a tree for complex bracket. */
- dfa->has_mb_node = 1;
- br_token.type = COMPLEX_BRACKET;
- br_token.opr.mbcset = mbcset;
- mbc_tree = create_token_tree (dfa, NULL, NULL, &br_token);
- if (BE (mbc_tree == NULL, 0))
- goto parse_bracket_exp_espace;
- for (sbc_idx = 0; sbc_idx < BITSET_WORDS; ++sbc_idx)
- if (sbcset[sbc_idx])
- break;
- /* If there are no bits set in sbcset, there is no point
- of having both SIMPLE_BRACKET and COMPLEX_BRACKET. */
- if (sbc_idx < BITSET_WORDS)
- {
- /* Build a tree for simple bracket. */
- br_token.type = SIMPLE_BRACKET;
- br_token.opr.sbcset = sbcset;
- work_tree = create_token_tree (dfa, NULL, NULL, &br_token);
- if (BE (work_tree == NULL, 0))
- goto parse_bracket_exp_espace;
-
- /* Then join them by ALT node. */
- work_tree = create_tree (dfa, work_tree, mbc_tree, OP_ALT);
- if (BE (work_tree == NULL, 0))
- goto parse_bracket_exp_espace;
- }
- else
- {
- re_free (sbcset);
- work_tree = mbc_tree;
- }
- }
- else
-#endif /* not RE_ENABLE_I18N */
- {
-#ifdef RE_ENABLE_I18N
- free_charset (mbcset);
-#endif
- /* Build a tree for simple bracket. */
- br_token.type = SIMPLE_BRACKET;
- br_token.opr.sbcset = sbcset;
- work_tree = create_token_tree (dfa, NULL, NULL, &br_token);
- if (BE (work_tree == NULL, 0))
- goto parse_bracket_exp_espace;
- }
- return work_tree;
-
- parse_bracket_exp_espace:
- *err = REG_ESPACE;
- parse_bracket_exp_free_return:
- re_free (sbcset);
-#ifdef RE_ENABLE_I18N
- free_charset (mbcset);
-#endif /* RE_ENABLE_I18N */
- return NULL;
-}
-
-/* Parse an element in the bracket expression. */
-
-static reg_errcode_t
-parse_bracket_element (bracket_elem_t *elem, re_string_t *regexp,
- re_token_t *token, int token_len, re_dfa_t *dfa,
- reg_syntax_t syntax, int accept_hyphen)
-{
-#ifdef RE_ENABLE_I18N
- int cur_char_size;
- cur_char_size = re_string_char_size_at (regexp, re_string_cur_idx (regexp));
- if (cur_char_size > 1)
- {
- elem->type = MB_CHAR;
- elem->opr.wch = re_string_wchar_at (regexp, re_string_cur_idx (regexp));
- re_string_skip_bytes (regexp, cur_char_size);
- return REG_NOERROR;
- }
-#endif /* RE_ENABLE_I18N */
- re_string_skip_bytes (regexp, token_len); /* Skip a token. */
- if (token->type == OP_OPEN_COLL_ELEM || token->type == OP_OPEN_CHAR_CLASS
- || token->type == OP_OPEN_EQUIV_CLASS)
- return parse_bracket_symbol (elem, regexp, token);
- if (BE (token->type == OP_CHARSET_RANGE, 0) && !accept_hyphen)
- {
- /* A '-' must only appear as anything but a range indicator before
- the closing bracket. Everything else is an error. */
- re_token_t token2;
- (void) peek_token_bracket (&token2, regexp, syntax);
- if (token2.type != OP_CLOSE_BRACKET)
- /* The actual error value is not standardized since this whole
- case is undefined. But ERANGE makes good sense. */
- return REG_ERANGE;
- }
- elem->type = SB_CHAR;
- elem->opr.ch = token->opr.c;
- return REG_NOERROR;
-}
-
-/* Parse a bracket symbol in the bracket expression. Bracket symbols are
- such as [:<character_class>:], [.<collating_element>.], and
- [=<equivalent_class>=]. */
-
-static reg_errcode_t
-parse_bracket_symbol (bracket_elem_t *elem, re_string_t *regexp,
- re_token_t *token)
-{
- unsigned char ch, delim = token->opr.c;
- int i = 0;
- if (re_string_eoi(regexp))
- return REG_EBRACK;
- for (;; ++i)
- {
- if (i >= BRACKET_NAME_BUF_SIZE)
- return REG_EBRACK;
- if (token->type == OP_OPEN_CHAR_CLASS)
- ch = re_string_fetch_byte_case (regexp);
- else
- ch = re_string_fetch_byte (regexp);
- if (re_string_eoi(regexp))
- return REG_EBRACK;
- if (ch == delim && re_string_peek_byte (regexp, 0) == ']')
- break;
- elem->opr.name[i] = ch;
- }
- re_string_skip_bytes (regexp, 1);
- elem->opr.name[i] = '\0';
- switch (token->type)
- {
- case OP_OPEN_COLL_ELEM:
- elem->type = COLL_SYM;
- break;
- case OP_OPEN_EQUIV_CLASS:
- elem->type = EQUIV_CLASS;
- break;
- case OP_OPEN_CHAR_CLASS:
- elem->type = CHAR_CLASS;
- break;
- default:
- break;
- }
- return REG_NOERROR;
-}
-
- /* Helper function for parse_bracket_exp.
- Build the equivalence class which is represented by NAME.
- The result are written to MBCSET and SBCSET.
- EQUIV_CLASS_ALLOC is the allocated size of mbcset->equiv_classes,
- is a pointer argument sinse we may update it. */
-
-static reg_errcode_t
-#ifdef RE_ENABLE_I18N
-build_equiv_class (bitset_t sbcset, re_charset_t *mbcset,
- int *equiv_class_alloc, const unsigned char *name)
-#else /* not RE_ENABLE_I18N */
-build_equiv_class (bitset_t sbcset, const unsigned char *name)
-#endif /* not RE_ENABLE_I18N */
-{
-#ifdef _LIBC
- uint32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
- if (nrules != 0)
- {
- const int32_t *table, *indirect;
- const unsigned char *weights, *extra, *cp;
- unsigned char char_buf[2];
- int32_t idx1, idx2;
- unsigned int ch;
- size_t len;
- /* This #include defines a local function! */
-# include <locale/weight.h>
- /* Calculate the index for equivalence class. */
- cp = name;
- table = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB);
- weights = (const unsigned char *) _NL_CURRENT (LC_COLLATE,
- _NL_COLLATE_WEIGHTMB);
- extra = (const unsigned char *) _NL_CURRENT (LC_COLLATE,
- _NL_COLLATE_EXTRAMB);
- indirect = (const int32_t *) _NL_CURRENT (LC_COLLATE,
- _NL_COLLATE_INDIRECTMB);
- idx1 = findidx (&cp);
- if (BE (idx1 == 0 || cp < name + strlen ((const char *) name), 0))
- /* This isn't a valid character. */
- return REG_ECOLLATE;
-
- /* Build single byte matcing table for this equivalence class. */
- char_buf[1] = (unsigned char) '\0';
- len = weights[idx1 & 0xffffff];
- for (ch = 0; ch < SBC_MAX; ++ch)
- {
- char_buf[0] = ch;
- cp = char_buf;
- idx2 = findidx (&cp);
-/*
- idx2 = table[ch];
-*/
- if (idx2 == 0)
- /* This isn't a valid character. */
- continue;
- /* Compare only if the length matches and the collation rule
- index is the same. */
- if (len == weights[idx2 & 0xffffff] && (idx1 >> 24) == (idx2 >> 24))
- {
- int cnt = 0;
-
- while (cnt <= len &&
- weights[(idx1 & 0xffffff) + 1 + cnt]
- == weights[(idx2 & 0xffffff) + 1 + cnt])
- ++cnt;
-
- if (cnt > len)
- bitset_set (sbcset, ch);
- }
- }
- /* Check whether the array has enough space. */
- if (BE (*equiv_class_alloc == mbcset->nequiv_classes, 0))
- {
- /* Not enough, realloc it. */
- /* +1 in case of mbcset->nequiv_classes is 0. */
- int new_equiv_class_alloc = 2 * mbcset->nequiv_classes + 1;
- /* Use realloc since the array is NULL if *alloc == 0. */
- int32_t *new_equiv_classes = re_realloc (mbcset->equiv_classes,
- int32_t,
- new_equiv_class_alloc);
- if (BE (new_equiv_classes == NULL, 0))
- return REG_ESPACE;
- mbcset->equiv_classes = new_equiv_classes;
- *equiv_class_alloc = new_equiv_class_alloc;
- }
- mbcset->equiv_classes[mbcset->nequiv_classes++] = idx1;
- }
- else
-#endif /* _LIBC */
- {
- if (BE (strlen ((const char *) name) != 1, 0))
- return REG_ECOLLATE;
- bitset_set (sbcset, *name);
- }
- return REG_NOERROR;
-}
-
- /* Helper function for parse_bracket_exp.
- Build the character class which is represented by NAME.
- The result are written to MBCSET and SBCSET.
- CHAR_CLASS_ALLOC is the allocated size of mbcset->char_classes,
- is a pointer argument sinse we may update it. */
-
-static reg_errcode_t
-#ifdef RE_ENABLE_I18N
-build_charclass (RE_TRANSLATE_TYPE trans, bitset_t sbcset,
- re_charset_t *mbcset, int *char_class_alloc,
- const unsigned char *class_name, reg_syntax_t syntax)
-#else /* not RE_ENABLE_I18N */
-build_charclass (RE_TRANSLATE_TYPE trans, bitset_t sbcset,
- const unsigned char *class_name, reg_syntax_t syntax)
-#endif /* not RE_ENABLE_I18N */
-{
- int i;
- const char *name = (const char *) class_name;
-
- /* In case of REG_ICASE "upper" and "lower" match the both of
- upper and lower cases. */
- if ((syntax & RE_ICASE)
- && (strcmp (name, "upper") == 0 || strcmp (name, "lower") == 0))
- name = "alpha";
-
-#ifdef RE_ENABLE_I18N
- /* Check the space of the arrays. */
- if (BE (*char_class_alloc == mbcset->nchar_classes, 0))
- {
- /* Not enough, realloc it. */
- /* +1 in case of mbcset->nchar_classes is 0. */
- int new_char_class_alloc = 2 * mbcset->nchar_classes + 1;
- /* Use realloc since array is NULL if *alloc == 0. */
- wctype_t *new_char_classes = re_realloc (mbcset->char_classes, wctype_t,
- new_char_class_alloc);
- if (BE (new_char_classes == NULL, 0))
- return REG_ESPACE;
- mbcset->char_classes = new_char_classes;
- *char_class_alloc = new_char_class_alloc;
- }
- mbcset->char_classes[mbcset->nchar_classes++] = __wctype (name);
-#endif /* RE_ENABLE_I18N */
-
-#define BUILD_CHARCLASS_LOOP(ctype_func) \
- do { \
- if (BE (trans != NULL, 0)) \
- { \
- for (i = 0; i < SBC_MAX; ++i) \
- if (ctype_func (i)) \
- bitset_set (sbcset, trans[i]); \
- } \
- else \
- { \
- for (i = 0; i < SBC_MAX; ++i) \
- if (ctype_func (i)) \
- bitset_set (sbcset, i); \
- } \
- } while (0)
-
- if (strcmp (name, "alnum") == 0)
- BUILD_CHARCLASS_LOOP (isalnum);
- else if (strcmp (name, "cntrl") == 0)
- BUILD_CHARCLASS_LOOP (iscntrl);
- else if (strcmp (name, "lower") == 0)
- BUILD_CHARCLASS_LOOP (islower);
- else if (strcmp (name, "space") == 0)
- BUILD_CHARCLASS_LOOP (isspace);
- else if (strcmp (name, "alpha") == 0)
- BUILD_CHARCLASS_LOOP (isalpha);
- else if (strcmp (name, "digit") == 0)
- BUILD_CHARCLASS_LOOP (isdigit);
- else if (strcmp (name, "print") == 0)
- BUILD_CHARCLASS_LOOP (isprint);
- else if (strcmp (name, "upper") == 0)
- BUILD_CHARCLASS_LOOP (isupper);
- else if (strcmp (name, "blank") == 0)
- BUILD_CHARCLASS_LOOP (isblank);
- else if (strcmp (name, "graph") == 0)
- BUILD_CHARCLASS_LOOP (isgraph);
- else if (strcmp (name, "punct") == 0)
- BUILD_CHARCLASS_LOOP (ispunct);
- else if (strcmp (name, "xdigit") == 0)
- BUILD_CHARCLASS_LOOP (isxdigit);
- else
- return REG_ECTYPE;
-
- return REG_NOERROR;
-}
-
-static bin_tree_t *
-build_charclass_op (re_dfa_t *dfa, RE_TRANSLATE_TYPE trans,
- const unsigned char *class_name,
- const unsigned char *extra, int non_match,
- reg_errcode_t *err)
-{
- re_bitset_ptr_t sbcset;
-#ifdef RE_ENABLE_I18N
- re_charset_t *mbcset;
- int alloc = 0;
-#endif /* not RE_ENABLE_I18N */
- reg_errcode_t ret;
- re_token_t br_token;
- bin_tree_t *tree;
-
- sbcset = (re_bitset_ptr_t) calloc (sizeof (bitset_t), 1);
-#ifdef RE_ENABLE_I18N
- mbcset = (re_charset_t *) calloc (sizeof (re_charset_t), 1);
-#endif /* RE_ENABLE_I18N */
-
-#ifdef RE_ENABLE_I18N
- if (BE (sbcset == NULL || mbcset == NULL, 0))
-#else /* not RE_ENABLE_I18N */
- if (BE (sbcset == NULL, 0))
-#endif /* not RE_ENABLE_I18N */
- {
- *err = REG_ESPACE;
- return NULL;
- }
-
- if (non_match)
- {
-#ifdef RE_ENABLE_I18N
- mbcset->non_match = 1;
-#endif /* not RE_ENABLE_I18N */
- }
-
- /* We don't care the syntax in this case. */
- ret = build_charclass (trans, sbcset,
-#ifdef RE_ENABLE_I18N
- mbcset, &alloc,
-#endif /* RE_ENABLE_I18N */
- class_name, 0);
-
- if (BE (ret != REG_NOERROR, 0))
- {
- re_free (sbcset);
-#ifdef RE_ENABLE_I18N
- free_charset (mbcset);
-#endif /* RE_ENABLE_I18N */
- *err = ret;
- return NULL;
- }
- /* \w match '_' also. */
- for (; *extra; extra++)
- bitset_set (sbcset, *extra);
-
- /* If it is non-matching list. */
- if (non_match)
- bitset_not (sbcset);
-
-#ifdef RE_ENABLE_I18N
- /* Ensure only single byte characters are set. */
- if (dfa->mb_cur_max > 1)
- bitset_mask (sbcset, dfa->sb_char);
-#endif
-
- /* Build a tree for simple bracket. */
- br_token.type = SIMPLE_BRACKET;
- br_token.opr.sbcset = sbcset;
- tree = create_token_tree (dfa, NULL, NULL, &br_token);
- if (BE (tree == NULL, 0))
- goto build_word_op_espace;
-
-#ifdef RE_ENABLE_I18N
- if (dfa->mb_cur_max > 1)
- {
- bin_tree_t *mbc_tree;
- /* Build a tree for complex bracket. */
- br_token.type = COMPLEX_BRACKET;
- br_token.opr.mbcset = mbcset;
- dfa->has_mb_node = 1;
- mbc_tree = create_token_tree (dfa, NULL, NULL, &br_token);
- if (BE (mbc_tree == NULL, 0))
- goto build_word_op_espace;
- /* Then join them by ALT node. */
- tree = create_tree (dfa, tree, mbc_tree, OP_ALT);
- if (BE (mbc_tree != NULL, 1))
- return tree;
- }
- else
- {
- free_charset (mbcset);
- return tree;
- }
-#else /* not RE_ENABLE_I18N */
- return tree;
-#endif /* not RE_ENABLE_I18N */
-
- build_word_op_espace:
- re_free (sbcset);
-#ifdef RE_ENABLE_I18N
- free_charset (mbcset);
-#endif /* RE_ENABLE_I18N */
- *err = REG_ESPACE;
- return NULL;
-}
-
-/* This is intended for the expressions like "a{1,3}".
- Fetch a number from `input', and return the number.
- Return -1, if the number field is empty like "{,1}".
- Return -2, If an error is occured. */
-
-static int
-fetch_number (re_string_t *input, re_token_t *token, reg_syntax_t syntax)
-{
- int num = -1;
- unsigned char c;
- while (1)
- {
- fetch_token (token, input, syntax);
- c = token->opr.c;
- if (BE (token->type == END_OF_RE, 0))
- return -2;
- if (token->type == OP_CLOSE_DUP_NUM || c == ',')
- break;
- num = ((token->type != CHARACTER || c < '0' || '9' < c || num == -2)
- ? -2 : ((num == -1) ? c - '0' : num * 10 + c - '0'));
- num = (num > RE_DUP_MAX) ? -2 : num;
- }
- return num;
-}
-
-#ifdef RE_ENABLE_I18N
-static void
-free_charset (re_charset_t *cset)
-{
- re_free (cset->mbchars);
-# ifdef _LIBC
- re_free (cset->coll_syms);
- re_free (cset->equiv_classes);
- re_free (cset->range_starts);
- re_free (cset->range_ends);
-# endif
- re_free (cset->char_classes);
- re_free (cset);
-}
-#endif /* RE_ENABLE_I18N */
-
-/* Functions for binary tree operation. */
-
-/* Create a tree node. */
-
-static bin_tree_t *
-create_tree (re_dfa_t *dfa, bin_tree_t *left, bin_tree_t *right,
- re_token_type_t type)
-{
- re_token_t t;
- t.type = type;
- return create_token_tree (dfa, left, right, &t);
-}
-
-static bin_tree_t *
-create_token_tree (re_dfa_t *dfa, bin_tree_t *left, bin_tree_t *right,
- const re_token_t *token)
-{
- bin_tree_t *tree;
- if (BE (dfa->str_tree_storage_idx == BIN_TREE_STORAGE_SIZE, 0))
- {
- bin_tree_storage_t *storage = re_malloc (bin_tree_storage_t, 1);
-
- if (storage == NULL)
- return NULL;
- storage->next = dfa->str_tree_storage;
- dfa->str_tree_storage = storage;
- dfa->str_tree_storage_idx = 0;
- }
- tree = &dfa->str_tree_storage->data[dfa->str_tree_storage_idx++];
-
- tree->parent = NULL;
- tree->left = left;
- tree->right = right;
- tree->token = *token;
- tree->token.duplicated = 0;
- tree->token.opt_subexp = 0;
- tree->first = NULL;
- tree->next = NULL;
- tree->node_idx = -1;
-
- if (left != NULL)
- left->parent = tree;
- if (right != NULL)
- right->parent = tree;
- return tree;
-}
-
-/* Mark the tree SRC as an optional subexpression.
- To be called from preorder or postorder. */
-
-static reg_errcode_t
-mark_opt_subexp (void *extra, bin_tree_t *node)
-{
- int idx = (int) (long) extra;
- if (node->token.type == SUBEXP && node->token.opr.idx == idx)
- node->token.opt_subexp = 1;
-
- return REG_NOERROR;
-}
-
-/* Free the allocated memory inside NODE. */
-
-static void
-free_token (re_token_t *node)
-{
-#ifdef RE_ENABLE_I18N
- if (node->type == COMPLEX_BRACKET && node->duplicated == 0)
- free_charset (node->opr.mbcset);
- else
-#endif /* RE_ENABLE_I18N */
- if (node->type == SIMPLE_BRACKET && node->duplicated == 0)
- re_free (node->opr.sbcset);
-}
-
-/* Worker function for tree walking. Free the allocated memory inside NODE
- and its children. */
-
-static reg_errcode_t
-free_tree (void *extra, bin_tree_t *node)
-{
- free_token (&node->token);
- return REG_NOERROR;
-}
-
-
-/* Duplicate the node SRC, and return new node. This is a preorder
- visit similar to the one implemented by the generic visitor, but
- we need more infrastructure to maintain two parallel trees --- so,
- it's easier to duplicate. */
-
-static bin_tree_t *
-duplicate_tree (const bin_tree_t *root, re_dfa_t *dfa)
-{
- const bin_tree_t *node;
- bin_tree_t *dup_root;
- bin_tree_t **p_new = &dup_root, *dup_node = root->parent;
-
- for (node = root; ; )
- {
- /* Create a new tree and link it back to the current parent. */
- *p_new = create_token_tree (dfa, NULL, NULL, &node->token);
- if (*p_new == NULL)
- return NULL;
- (*p_new)->parent = dup_node;
- (*p_new)->token.duplicated = 1;
- dup_node = *p_new;
-
- /* Go to the left node, or up and to the right. */
- if (node->left)
- {
- node = node->left;
- p_new = &dup_node->left;
- }
- else
- {
- const bin_tree_t *prev = NULL;
- while (node->right == prev || node->right == NULL)
- {
- prev = node;
- node = node->parent;
- dup_node = dup_node->parent;
- if (!node)
- return dup_root;
- }
- node = node->right;
- p_new = &dup_node->right;
- }
- }
-}
Modified: trunk/src/utilfuns/regex.c
===================================================================
--- trunk/src/utilfuns/regex.c 2009-12-07 04:02:43 UTC (rev 2486)
+++ trunk/src/utilfuns/regex.c 2009-12-08 07:18:00 UTC (rev 2487)
@@ -1,74 +1,5721 @@
-/* Extended regular expression matching and search library.
- Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Isamu Hasegawa <isamu at yamato.ibm.com>.
+/* Extended regular expression matching and search library,
+ version 0.12.
+ (Implements POSIX draft P1003.2/D11.2, except for some of the
+ internationalization features.)
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
+ Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
+ the C library, however. The master source lives in /gd/gnu/lib.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+NOTE: The canonical source of this file is maintained with the
+GNU C Library. Bugs can be reported to bug-glibc at prep.ai.mit.edu.
+This program is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software Foundation,
+Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+/* AIX requires this to be the first thing in the file. */
+#if defined (_AIX) && !defined (REGEX_MALLOC)
+ #pragma alloca
+#endif
+
+#undef _GNU_SOURCE
+#define _GNU_SOURCE
+
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
-/* Make sure noone compiles this code with a C++ compiler. */
-#ifdef __cplusplus
-# error "This is C code, use a C compiler"
+#if defined(STDC_HEADERS) && !defined(emacs)
+#include <stddef.h>
+#else
+/* We need this for `regex.h', and perhaps for the Emacs include files. */
+#include <sys/types.h>
#endif
+#include <stdlib.h> // sword
-#ifdef _LIBC
-/* We have to keep the namespace clean. */
-# define regfree(preg) __regfree (preg)
-# define regexec(pr, st, nm, pm, ef) __regexec (pr, st, nm, pm, ef)
-# define regcomp(preg, pattern, cflags) __regcomp (preg, pattern, cflags)
-# define regerror(errcode, preg, errbuf, errbuf_size) \
- __regerror(errcode, preg, errbuf, errbuf_size)
-# define re_set_registers(bu, re, nu, st, en) \
- __re_set_registers (bu, re, nu, st, en)
-# define re_match_2(bufp, string1, size1, string2, size2, pos, regs, stop) \
- __re_match_2 (bufp, string1, size1, string2, size2, pos, regs, stop)
-# define re_match(bufp, string, size, pos, regs) \
- __re_match (bufp, string, size, pos, regs)
-# define re_search(bufp, string, size, startpos, range, regs) \
- __re_search (bufp, string, size, startpos, range, regs)
-# define re_compile_pattern(pattern, length, bufp) \
- __re_compile_pattern (pattern, length, bufp)
-# define re_set_syntax(syntax) __re_set_syntax (syntax)
-# define re_search_2(bufp, st1, s1, st2, s2, startpos, range, regs, stop) \
- __re_search_2 (bufp, st1, s1, st2, s2, startpos, range, regs, stop)
-# define re_compile_fastmap(bufp) __re_compile_fastmap (bufp)
+/* For platform which support the ISO C amendement 1 functionality we
+ support user defined character classes. */
+#if defined _LIBC || (defined HAVE_WCTYPE_H && defined HAVE_WCHAR_H)
+# include <wctype.h>
+# include <wchar.h>
+#endif
-# include "../locale/localeinfo.h"
+/* This is for other GNU distributions with internationalized messages. */
+#if HAVE_LIBINTL_H || defined (_LIBC)
+# include <libintl.h>
+#else
+# define gettext(msgid) (msgid)
#endif
-/* On some systems, limits.h sets RE_DUP_MAX to a lower value than
- GNU regex allows. Include it before <regex.h>, which correctly
- #undefs RE_DUP_MAX and sets it to the right value. */
-#include <limits.h>
+#ifndef gettext_noop
+/* This define is so xgettext can find the internationalizable
+ strings. */
+#define gettext_noop(String) String
+#endif
-#include <regex.h>
-#include "regex_internal.h"
+/* The `emacs' switch turns on certain matching commands
+ that make sense only in Emacs. */
+#ifdef emacs
-#include "regex_internal.c"
-#include "regcomp.c"
-#include "regexec.c"
+#include "lisp.h"
+#include "buffer.h"
+#include "syntax.h"
-/* Binary backward compatibility. */
-#if _LIBC
-# include <shlib-compat.h>
-# if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_3)
-link_warning (re_max_failures, "the 're_max_failures' variable is obsolete and will go away.")
+#else /* not emacs */
+
+/* If we are not linking with Emacs proper,
+ we can't use the relocating allocator
+ even if config.h says that we can. */
+#undef REL_ALLOC
+
+#if defined (STDC_HEADERS) || defined (_LIBC)
+#include <stdlib.h>
+#else
+//sword char *malloc ();
+//sword char *realloc ();
+#endif
+
+/* When used in Emacs's lib-src, we need to get bzero and bcopy somehow.
+ If nothing else has been done, use the method below. */
+#ifdef INHIBIT_STRING_HEADER
+#if !(defined (HAVE_BZERO) && defined (HAVE_BCOPY))
+#if !defined (bzero) && !defined (bcopy)
+#undef INHIBIT_STRING_HEADER
+#endif
+#endif
+#endif
+
+/* This is the normal way of making sure we have a bcopy and a bzero.
+ This is used in most programs--a few other programs avoid this
+ by defining INHIBIT_STRING_HEADER. */
+#define HAVE_STRING_H // for SWORD Project
+#ifndef INHIBIT_STRING_HEADER
+#if defined (HAVE_STRING_H) || defined (STDC_HEADERS) || defined (_LIBC)
+#include <string.h>
+#ifndef bcmp
+#define bcmp(s1, s2, n) memcmp ((s1), (s2), (n))
+#endif
+#ifndef bcopy
+#define bcopy(s, d, n) memcpy ((d), (s), (n))
+#endif
+#ifndef bzero
+#define bzero(s, n) memset ((s), 0, (n))
+#endif
+#else
+#include <strings.h>
+#endif
+#endif
+
+/* Define the syntax stuff for \<, \>, etc. */
+
+/* This must be nonzero for the wordchar and notwordchar pattern
+ commands in re_match_2. */
+#ifndef Sword
+#define Sword 1
+#endif
+
+#ifdef SWITCH_ENUM_BUG
+#define SWITCH_ENUM_CAST(x) ((int)(x))
+#else
+#define SWITCH_ENUM_CAST(x) (x)
+#endif
+
+#ifdef SYNTAX_TABLE
+
+extern char *re_syntax_table;
+
+#else /* not SYNTAX_TABLE */
+
+/* How many characters in the character set. */
+#define CHAR_SET_SIZE 256
+
+static char re_syntax_table[CHAR_SET_SIZE];
+
+static void
+init_syntax_once ()
+{
+ register int c;
+ static int done = 0;
+
+ if (done)
+ return;
+
+ bzero (re_syntax_table, sizeof re_syntax_table);
+
+ for (c = 'a'; c <= 'z'; c++)
+ re_syntax_table[c] = Sword;
+
+ for (c = 'A'; c <= 'Z'; c++)
+ re_syntax_table[c] = Sword;
+
+ for (c = '0'; c <= '9'; c++)
+ re_syntax_table[c] = Sword;
+
+ re_syntax_table['_'] = Sword;
+
+ done = 1;
+}
+
+#endif /* not SYNTAX_TABLE */
+
+#define SYNTAX(c) re_syntax_table[c]
+
+#endif /* not emacs */
+
+/* Get the interface, including the syntax bits. */
+#include "regex.h"
+
+/* isalpha etc. are used for the character classes. */
+#include <ctype.h>
+
+/* Jim Meyering writes:
+
+ "... Some ctype macros are valid only for character codes that
+ isascii says are ASCII (SGI's IRIX-4.0.5 is one such system --when
+ using /bin/cc or gcc but without giving an ansi option). So, all
+ ctype uses should be through macros like ISPRINT... If
+ STDC_HEADERS is defined, then autoconf has verified that the ctype
+ macros don't need to be guarded with references to isascii. ...
+ Defining isascii to 1 should let any compiler worth its salt
+ eliminate the && through constant folding." */
+
+#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
+#define ISASCII(c) 1
+#else
+#define ISASCII(c) isascii(c)
+#endif
+
+#ifdef isblank
+#define ISBLANK(c) (ISASCII (c) && isblank (c))
+#else
+#define ISBLANK(c) ((c) == ' ' || (c) == '\t')
+#endif
+#ifdef isgraph
+#define ISGRAPH(c) (ISASCII (c) && isgraph (c))
+#else
+#define ISGRAPH(c) (ISASCII (c) && isprint (c) && !isspace (c))
+#endif
+
+#define ISPRINT(c) (ISASCII (c) && isprint (c))
+#define ISDIGIT(c) (ISASCII (c) && isdigit (c))
+#define ISALNUM(c) (ISASCII (c) && isalnum (c))
+#define ISALPHA(c) (ISASCII (c) && isalpha (c))
+#define ISCNTRL(c) (ISASCII (c) && iscntrl (c))
+#define ISLOWER(c) (ISASCII (c) && islower (c))
+#define ISPUNCT(c) (ISASCII (c) && ispunct (c))
+#define ISSPACE(c) (ISASCII (c) && isspace (c))
+#define ISUPPER(c) (ISASCII (c) && isupper (c))
+#define ISXDIGIT(c) (ISASCII (c) && isxdigit (c))
+
+#ifndef NULL
+#define NULL (void *)0
+#endif
+
+/* We remove any previous definition of `SIGN_EXTEND_CHAR',
+ since ours (we hope) works properly with all combinations of
+ machines, compilers, `char' and `unsigned char' argument types.
+ (Per Bothner suggested the basic approach.) */
+#undef SIGN_EXTEND_CHAR
+#if __STDC__
+#define SIGN_EXTEND_CHAR(c) ((signed char) (c))
+#else /* not __STDC__ */
+/* As in Harbison and Steele. */
+#define SIGN_EXTEND_CHAR(c) ((((unsigned char) (c)) ^ 128) - 128)
+#endif
+
+/* Should we use malloc or alloca? If REGEX_MALLOC is not defined, we
+ use `alloca' instead of `malloc'. This is because using malloc in
+ re_search* or re_match* could cause memory leaks when C-g is used in
+ Emacs; also, malloc is slower and causes storage fragmentation. On
+ the other hand, malloc is more portable, and easier to debug.
+
+ Because we sometimes use alloca, some routines have to be macros,
+ not functions -- `alloca'-allocated space disappears at the end of the
+ function it is called in. */
+
+#ifdef REGEX_MALLOC
+
+#define REGEX_ALLOCATE malloc
+#define REGEX_REALLOCATE(source, osize, nsize) realloc (source, nsize)
+#define REGEX_FREE free
+
+#else /* not REGEX_MALLOC */
+
+/* Emacs already defines alloca, sometimes. */
+#ifndef alloca
+
+/* Make alloca work the best possible way. */
+#ifdef __GNUC__
+#define alloca __builtin_alloca
+#else /* not __GNUC__ */
+#if HAVE_ALLOCA_H
+#include <alloca.h>
+#else /* not __GNUC__ or HAVE_ALLOCA_H */
+#if 0 /* It is a bad idea to declare alloca. We always cast the result. */
+#ifndef _AIX /* Already did AIX, up at the top. */
+char *alloca ();
+#endif /* not _AIX */
+#endif
+#endif /* not HAVE_ALLOCA_H */
+#endif /* not __GNUC__ */
+
+#endif /* not alloca */
+
+#define REGEX_ALLOCATE alloca
+
+/* Assumes a `char *destination' variable. */
+#define REGEX_REALLOCATE(source, osize, nsize) \
+ (destination = (char *) alloca (nsize), \
+ bcopy (source, destination, osize), \
+ destination)
+
+/* No need to do anything to free, after alloca. */
+#define REGEX_FREE(arg) ((void)0) /* Do nothing! But inhibit gcc warning. */
+
+#endif /* not REGEX_MALLOC */
+
+/* Define how to allocate the failure stack. */
+
+#if defined (REL_ALLOC) && defined (REGEX_MALLOC)
+
+#define REGEX_ALLOCATE_STACK(size) \
+ r_alloc (&failure_stack_ptr, (size))
+#define REGEX_REALLOCATE_STACK(source, osize, nsize) \
+ r_re_alloc (&failure_stack_ptr, (nsize))
+#define REGEX_FREE_STACK(ptr) \
+ r_alloc_free (&failure_stack_ptr)
+
+#else /* not using relocating allocator */
+
+#ifdef REGEX_MALLOC
+
+#define REGEX_ALLOCATE_STACK malloc
+#define REGEX_REALLOCATE_STACK(source, osize, nsize) realloc (source, nsize)
+#define REGEX_FREE_STACK free
+
+#else /* not REGEX_MALLOC */
+
+#define REGEX_ALLOCATE_STACK alloca
+
+#define REGEX_REALLOCATE_STACK(source, osize, nsize) \
+ REGEX_REALLOCATE (source, osize, nsize)
+/* No need to explicitly free anything. */
+#define REGEX_FREE_STACK(arg)
+
+#endif /* not REGEX_MALLOC */
+#endif /* not using relocating allocator */
+
+
+/* True if `size1' is non-NULL and PTR is pointing anywhere inside
+ `string1' or just past its end. This works if PTR is NULL, which is
+ a good thing. */
+#define FIRST_STRING_P(ptr) \
+ (size1 && string1 <= (ptr) && (ptr) <= string1 + size1)
+
+/* (Re)Allocate N items of type T using malloc, or fail. */
+#define TALLOC(n, t) ((t *) malloc ((n) * sizeof (t)))
+#define RETALLOC(addr, n, t) ((addr) = (t *) realloc (addr, (n) * sizeof (t)))
+#define RETALLOC_IF(addr, n, t) \
+ if (addr) RETALLOC((addr), (n), t); else (addr) = TALLOC ((n), t)
+#define REGEX_TALLOC(n, t) ((t *) REGEX_ALLOCATE ((n) * sizeof (t)))
+
+#define BYTEWIDTH 8 /* In bits. */
+
+#define STREQ(s1, s2) ((strcmp (s1, s2) == 0))
+
+#undef MAX
+#undef MIN
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+
+typedef char boolean;
+#define false 0
+#define true 1
+
+static int re_match_2_internal ();
+
+/* These are the command codes that appear in compiled regular
+ expressions. Some opcodes are followed by argument bytes. A
+ command code can specify any interpretation whatsoever for its
+ arguments. Zero bytes may appear in the compiled regular expression. */
+
+typedef enum
+{
+ no_op = 0,
+
+ /* Succeed right away--no more backtracking. */
+ succeed,
+
+ /* Followed by one byte giving n, then by n literal bytes. */
+ exactn,
+
+ /* Matches any (more or less) character. */
+ anychar,
+
+ /* Matches any one char belonging to specified set. First
+ following byte is number of bitmap bytes. Then come bytes
+ for a bitmap saying which chars are in. Bits in each byte
+ are ordered low-bit-first. A character is in the set if its
+ bit is 1. A character too large to have a bit in the map is
+ automatically not in the set. */
+ charset,
+
+ /* Same parameters as charset, but match any character that is
+ not one of those specified. */
+ charset_not,
+
+ /* Start remembering the text that is matched, for storing in a
+ register. Followed by one byte with the register number, in
+ the range 0 to one less than the pattern buffer's re_nsub
+ field. Then followed by one byte with the number of groups
+ inner to this one. (This last has to be part of the
+ start_memory only because we need it in the on_failure_jump
+ of re_match_2.) */
+ start_memory,
+
+ /* Stop remembering the text that is matched and store it in a
+ memory register. Followed by one byte with the register
+ number, in the range 0 to one less than `re_nsub' in the
+ pattern buffer, and one byte with the number of inner groups,
+ just like `start_memory'. (We need the number of inner
+ groups here because we don't have any easy way of finding the
+ corresponding start_memory when we're at a stop_memory.) */
+ stop_memory,
+
+ /* Match a duplicate of something remembered. Followed by one
+ byte containing the register number. */
+ duplicate,
+
+ /* Fail unless at beginning of line. */
+ begline,
+
+ /* Fail unless at end of line. */
+ endline,
+
+ /* Succeeds if at beginning of buffer (if emacs) or at beginning
+ of string to be matched (if not). */
+ begbuf,
+
+ /* Analogously, for end of buffer/string. */
+ endbuf,
+
+ /* Followed by two byte relative address to which to jump. */
+ jump,
+
+ /* Same as jump, but marks the end of an alternative. */
+ jump_past_alt,
+
+ /* Followed by two-byte relative address of place to resume at
+ in case of failure. */
+ on_failure_jump,
+
+ /* Like on_failure_jump, but pushes a placeholder instead of the
+ current string position when executed. */
+ on_failure_keep_string_jump,
+
+ /* Throw away latest failure point and then jump to following
+ two-byte relative address. */
+ pop_failure_jump,
+
+ /* Change to pop_failure_jump if know won't have to backtrack to
+ match; otherwise change to jump. This is used to jump
+ back to the beginning of a repeat. If what follows this jump
+ clearly won't match what the repeat does, such that we can be
+ sure that there is no use backtracking out of repetitions
+ already matched, then we change it to a pop_failure_jump.
+ Followed by two-byte address. */
+ maybe_pop_jump,
+
+ /* Jump to following two-byte address, and push a dummy failure
+ point. This failure point will be thrown away if an attempt
+ is made to use it for a failure. A `+' construct makes this
+ before the first repeat. Also used as an intermediary kind
+ of jump when compiling an alternative. */
+ dummy_failure_jump,
+
+ /* Push a dummy failure point and continue. Used at the end of
+ alternatives. */
+ push_dummy_failure,
+
+ /* Followed by two-byte relative address and two-byte number n.
+ After matching N times, jump to the address upon failure. */
+ succeed_n,
+
+ /* Followed by two-byte relative address, and two-byte number n.
+ Jump to the address N times, then fail. */
+ jump_n,
+
+ /* Set the following two-byte relative address to the
+ subsequent two-byte number. The address *includes* the two
+ bytes of number. */
+ set_number_at,
+
+ wordchar, /* Matches any word-constituent character. */
+ notwordchar, /* Matches any char that is not a word-constituent. */
+
+ wordbeg, /* Succeeds if at word beginning. */
+ wordend, /* Succeeds if at word end. */
+
+ wordbound, /* Succeeds if at a word boundary. */
+ notwordbound /* Succeeds if not at a word boundary. */
+
+#ifdef emacs
+ ,before_dot, /* Succeeds if before point. */
+ at_dot, /* Succeeds if at point. */
+ after_dot, /* Succeeds if after point. */
+
+ /* Matches any character whose syntax is specified. Followed by
+ a byte which contains a syntax code, e.g., Sword. */
+ syntaxspec,
+
+ /* Matches any character whose syntax is not that specified. */
+ notsyntaxspec
+#endif /* emacs */
+} re_opcode_t;
+
+/* Common operations on the compiled pattern. */
+
+/* Store NUMBER in two contiguous bytes starting at DESTINATION. */
+
+#define STORE_NUMBER(destination, number) \
+ do { \
+ (destination)[0] = (number) & 0377; \
+ (destination)[1] = (number) >> 8; \
+ } while (0)
+
+/* Same as STORE_NUMBER, except increment DESTINATION to
+ the byte after where the number is stored. Therefore, DESTINATION
+ must be an lvalue. */
+
+#define STORE_NUMBER_AND_INCR(destination, number) \
+ do { \
+ STORE_NUMBER (destination, number); \
+ (destination) += 2; \
+ } while (0)
+
+/* Put into DESTINATION a number stored in two contiguous bytes starting
+ at SOURCE. */
+
+#define EXTRACT_NUMBER(destination, source) \
+ do { \
+ (destination) = *(source) & 0377; \
+ (destination) += SIGN_EXTEND_CHAR (*((source) + 1)) << 8; \
+ } while (0)
+
+#ifdef DEBUG
+static void extract_number _RE_ARGS ((int *dest, unsigned char *source));
+static void
+extract_number (dest, source)
+ int *dest;
+ unsigned char *source;
+{
+ int temp = SIGN_EXTEND_CHAR (*(source + 1));
+ *dest = *source & 0377;
+ *dest += temp << 8;
+}
+
+#ifndef EXTRACT_MACROS /* To debug the macros. */
+#undef EXTRACT_NUMBER
+#define EXTRACT_NUMBER(dest, src) extract_number (&dest, src)
+#endif /* not EXTRACT_MACROS */
+
+#endif /* DEBUG */
+
+/* Same as EXTRACT_NUMBER, except increment SOURCE to after the number.
+ SOURCE must be an lvalue. */
+
+#define EXTRACT_NUMBER_AND_INCR(destination, source) \
+ do { \
+ EXTRACT_NUMBER (destination, source); \
+ (source) += 2; \
+ } while (0)
+
+#ifdef DEBUG
+static void extract_number_and_incr _RE_ARGS ((int *destination,
+ unsigned char **source));
+static void
+extract_number_and_incr (destination, source)
+ int *destination;
+ unsigned char **source;
+{
+ extract_number (destination, *source);
+ *source += 2;
+}
+
+#ifndef EXTRACT_MACROS
+#undef EXTRACT_NUMBER_AND_INCR
+#define EXTRACT_NUMBER_AND_INCR(dest, src) \
+ extract_number_and_incr (&dest, &src)
+#endif /* not EXTRACT_MACROS */
+
+#endif /* DEBUG */
+
+/* If DEBUG is defined, Regex prints many voluminous messages about what
+ it is doing (if the variable `debug' is nonzero). If linked with the
+ main program in `iregex.c', you can enter patterns and strings
+ interactively. And if linked with the main program in `main.c' and
+ the other test files, you can run the already-written tests. */
+
+#ifdef DEBUG
+
+/* We use standard I/O for debugging. */
+#include <stdio.h>
+
+/* It is useful to test things that ``must'' be true when debugging. */
+#include <assert.h>
+
+static int debug = 0;
+
+#define DEBUG_STATEMENT(e) e
+#define DEBUG_PRINT1(x) if (debug) printf (x)
+#define DEBUG_PRINT2(x1, x2) if (debug) printf (x1, x2)
+#define DEBUG_PRINT3(x1, x2, x3) if (debug) printf (x1, x2, x3)
+#define DEBUG_PRINT4(x1, x2, x3, x4) if (debug) printf (x1, x2, x3, x4)
+#define DEBUG_PRINT_COMPILED_PATTERN(p, s, e) \
+ if (debug) print_partial_compiled_pattern (s, e)
+#define DEBUG_PRINT_DOUBLE_STRING(w, s1, sz1, s2, sz2) \
+ if (debug) print_double_string (w, s1, sz1, s2, sz2)
+
+
+/* Print the fastmap in human-readable form. */
+
+void
+print_fastmap (fastmap)
+ char *fastmap;
+{
+ unsigned was_a_range = 0;
+ unsigned i = 0;
+
+ while (i < (1 << BYTEWIDTH))
+ {
+ if (fastmap[i++])
+ {
+ was_a_range = 0;
+ putchar (i - 1);
+ while (i < (1 << BYTEWIDTH) && fastmap[i])
+ {
+ was_a_range = 1;
+ i++;
+ }
+ if (was_a_range)
+ {
+ printf ("-");
+ putchar (i - 1);
+ }
+ }
+ }
+ putchar ('\n');
+}
+
+
+/* Print a compiled pattern string in human-readable form, starting at
+ the START pointer into it and ending just before the pointer END. */
+
+void
+print_partial_compiled_pattern (start, end)
+ unsigned char *start;
+ unsigned char *end;
+{
+ int mcnt, mcnt2;
+ unsigned char *p1;
+ unsigned char *p = start;
+ unsigned char *pend = end;
+
+ if (start == NULL)
+ {
+ printf ("(null)\n");
+ return;
+ }
+
+ /* Loop over pattern commands. */
+ while (p < pend)
+ {
+ printf ("%d:\t", p - start);
+
+ switch ((re_opcode_t) *p++)
+ {
+ case no_op:
+ printf ("/no_op");
+ break;
+
+ case exactn:
+ mcnt = *p++;
+ printf ("/exactn/%d", mcnt);
+ do
+ {
+ putchar ('/');
+ putchar (*p++);
+ }
+ while (--mcnt);
+ break;
+
+ case start_memory:
+ mcnt = *p++;
+ printf ("/start_memory/%d/%d", mcnt, *p++);
+ break;
+
+ case stop_memory:
+ mcnt = *p++;
+ printf ("/stop_memory/%d/%d", mcnt, *p++);
+ break;
+
+ case duplicate:
+ printf ("/duplicate/%d", *p++);
+ break;
+
+ case anychar:
+ printf ("/anychar");
+ break;
+
+ case charset:
+ case charset_not:
+ {
+ register int c, last = -100;
+ register int in_range = 0;
+
+ printf ("/charset [%s",
+ (re_opcode_t) *(p - 1) == charset_not ? "^" : "");
+
+ assert (p + *p < pend);
+
+ for (c = 0; c < 256; c++)
+ if (c / 8 < *p
+ && (p[1 + (c/8)] & (1 << (c % 8))))
+ {
+ /* Are we starting a range? */
+ if (last + 1 == c && ! in_range)
+ {
+ putchar ('-');
+ in_range = 1;
+ }
+ /* Have we broken a range? */
+ else if (last + 1 != c && in_range)
+ {
+ putchar (last);
+ in_range = 0;
+ }
+
+ if (! in_range)
+ putchar (c);
+
+ last = c;
+ }
+
+ if (in_range)
+ putchar (last);
+
+ putchar (']');
+
+ p += 1 + *p;
+ }
+ break;
+
+ case begline:
+ printf ("/begline");
+ break;
+
+ case endline:
+ printf ("/endline");
+ break;
+
+ case on_failure_jump:
+ extract_number_and_incr (&mcnt, &p);
+ printf ("/on_failure_jump to %d", p + mcnt - start);
+ break;
+
+ case on_failure_keep_string_jump:
+ extract_number_and_incr (&mcnt, &p);
+ printf ("/on_failure_keep_string_jump to %d", p + mcnt - start);
+ break;
+
+ case dummy_failure_jump:
+ extract_number_and_incr (&mcnt, &p);
+ printf ("/dummy_failure_jump to %d", p + mcnt - start);
+ break;
+
+ case push_dummy_failure:
+ printf ("/push_dummy_failure");
+ break;
+
+ case maybe_pop_jump:
+ extract_number_and_incr (&mcnt, &p);
+ printf ("/maybe_pop_jump to %d", p + mcnt - start);
+ break;
+
+ case pop_failure_jump:
+ extract_number_and_incr (&mcnt, &p);
+ printf ("/pop_failure_jump to %d", p + mcnt - start);
+ break;
+
+ case jump_past_alt:
+ extract_number_and_incr (&mcnt, &p);
+ printf ("/jump_past_alt to %d", p + mcnt - start);
+ break;
+
+ case jump:
+ extract_number_and_incr (&mcnt, &p);
+ printf ("/jump to %d", p + mcnt - start);
+ break;
+
+ case succeed_n:
+ extract_number_and_incr (&mcnt, &p);
+ p1 = p + mcnt;
+ extract_number_and_incr (&mcnt2, &p);
+ printf ("/succeed_n to %d, %d times", p1 - start, mcnt2);
+ break;
+
+ case jump_n:
+ extract_number_and_incr (&mcnt, &p);
+ p1 = p + mcnt;
+ extract_number_and_incr (&mcnt2, &p);
+ printf ("/jump_n to %d, %d times", p1 - start, mcnt2);
+ break;
+
+ case set_number_at:
+ extract_number_and_incr (&mcnt, &p);
+ p1 = p + mcnt;
+ extract_number_and_incr (&mcnt2, &p);
+ printf ("/set_number_at location %d to %d", p1 - start, mcnt2);
+ break;
+
+ case wordbound:
+ printf ("/wordbound");
+ break;
+
+ case notwordbound:
+ printf ("/notwordbound");
+ break;
+
+ case wordbeg:
+ printf ("/wordbeg");
+ break;
+
+ case wordend:
+ printf ("/wordend");
+
+#ifdef emacs
+ case before_dot:
+ printf ("/before_dot");
+ break;
+
+ case at_dot:
+ printf ("/at_dot");
+ break;
+
+ case after_dot:
+ printf ("/after_dot");
+ break;
+
+ case syntaxspec:
+ printf ("/syntaxspec");
+ mcnt = *p++;
+ printf ("/%d", mcnt);
+ break;
+
+ case notsyntaxspec:
+ printf ("/notsyntaxspec");
+ mcnt = *p++;
+ printf ("/%d", mcnt);
+ break;
+#endif /* emacs */
+
+ case wordchar:
+ printf ("/wordchar");
+ break;
+
+ case notwordchar:
+ printf ("/notwordchar");
+ break;
+
+ case begbuf:
+ printf ("/begbuf");
+ break;
+
+ case endbuf:
+ printf ("/endbuf");
+ break;
+
+ default:
+ printf ("?%d", *(p-1));
+ }
+
+ putchar ('\n');
+ }
+
+ printf ("%d:\tend of pattern.\n", p - start);
+}
+
+
+void
+print_compiled_pattern (bufp)
+ struct re_pattern_buffer *bufp;
+{
+ unsigned char *buffer = bufp->buffer;
+
+ print_partial_compiled_pattern (buffer, buffer + bufp->used);
+ printf ("%ld bytes used/%ld bytes allocated.\n",
+ bufp->used, bufp->allocated);
+
+ if (bufp->fastmap_accurate && bufp->fastmap)
+ {
+ printf ("fastmap: ");
+ print_fastmap (bufp->fastmap);
+ }
+
+ printf ("re_nsub: %d\t", bufp->re_nsub);
+ printf ("regs_alloc: %d\t", bufp->regs_allocated);
+ printf ("can_be_null: %d\t", bufp->can_be_null);
+ printf ("newline_anchor: %d\n", bufp->newline_anchor);
+ printf ("no_sub: %d\t", bufp->no_sub);
+ printf ("not_bol: %d\t", bufp->not_bol);
+ printf ("not_eol: %d\t", bufp->not_eol);
+ printf ("syntax: %lx\n", bufp->syntax);
+ /* Perhaps we should print the translate table? */
+}
+
+
+void
+print_double_string (where, string1, size1, string2, size2)
+ const char *where;
+ const char *string1;
+ const char *string2;
+ int size1;
+ int size2;
+{
+ int this_char;
+
+ if (where == NULL)
+ printf ("(null)");
+ else
+ {
+ if (FIRST_STRING_P (where))
+ {
+ for (this_char = where - string1; this_char < size1; this_char++)
+ putchar (string1[this_char]);
+
+ where = string2;
+ }
+
+ for (this_char = where - string2; this_char < size2; this_char++)
+ putchar (string2[this_char]);
+ }
+}
+
+void
+printchar (c)
+ int c;
+{
+ putc (c, stderr);
+}
+
+#else /* not DEBUG */
+
+#undef assert
+#define assert(e)
+
+#define DEBUG_STATEMENT(e)
+#define DEBUG_PRINT1(x)
+#define DEBUG_PRINT2(x1, x2)
+#define DEBUG_PRINT3(x1, x2, x3)
+#define DEBUG_PRINT4(x1, x2, x3, x4)
+#define DEBUG_PRINT_COMPILED_PATTERN(p, s, e)
+#define DEBUG_PRINT_DOUBLE_STRING(w, s1, sz1, s2, sz2)
+
+#endif /* not DEBUG */
+
+/* Set by `re_set_syntax' to the current regexp syntax to recognize. Can
+ also be assigned to arbitrarily: each pattern buffer stores its own
+ syntax, so it can be changed between regex compilations. */
+/* This has no initializer because initialized variables in Emacs
+ become read-only after dumping. */
+reg_syntax_t re_syntax_options;
+
+
+/* Specify the precise syntax of regexps for compilation. This provides
+ for compatibility for various utilities which historically have
+ different, incompatible syntaxes.
+
+ The argument SYNTAX is a bit mask comprised of the various bits
+ defined in regex.h. We return the old syntax. */
+
+reg_syntax_t
+re_set_syntax (syntax)
+ reg_syntax_t syntax;
+{
+ reg_syntax_t ret = re_syntax_options;
+
+ re_syntax_options = syntax;
+#ifdef DEBUG
+ if (syntax & RE_DEBUG)
+ debug = 1;
+ else if (debug) /* was on but now is not */
+ debug = 0;
+#endif /* DEBUG */
+ return ret;
+}
+
+/* This table gives an error message for each of the error codes listed
+ in regex.h. Obviously the order here has to be same as there.
+ POSIX doesn't require that we do anything for REG_NOERROR,
+ but why not be nice? */
+
+static const char *re_error_msgid[] =
+ {
+ gettext_noop ("Success"), /* REG_NOERROR */
+ gettext_noop ("No match"), /* REG_NOMATCH */
+ gettext_noop ("Invalid regular expression"), /* REG_BADPAT */
+ gettext_noop ("Invalid collation character"), /* REG_ECOLLATE */
+ gettext_noop ("Invalid character class name"), /* REG_ECTYPE */
+ gettext_noop ("Trailing backslash"), /* REG_EESCAPE */
+ gettext_noop ("Invalid back reference"), /* REG_ESUBREG */
+ gettext_noop ("Unmatched [ or [^"), /* REG_EBRACK */
+ gettext_noop ("Unmatched ( or \\("), /* REG_EPAREN */
+ gettext_noop ("Unmatched \\{"), /* REG_EBRACE */
+ gettext_noop ("Invalid content of \\{\\}"), /* REG_BADBR */
+ gettext_noop ("Invalid range end"), /* REG_ERANGE */
+ gettext_noop ("Memory exhausted"), /* REG_ESPACE */
+ gettext_noop ("Invalid preceding regular expression"), /* REG_BADRPT */
+ gettext_noop ("Premature end of regular expression"), /* REG_EEND */
+ gettext_noop ("Regular expression too big"), /* REG_ESIZE */
+ gettext_noop ("Unmatched ) or \\)"), /* REG_ERPAREN */
+ };
+
+/* Avoiding alloca during matching, to placate r_alloc. */
+
+/* Define MATCH_MAY_ALLOCATE unless we need to make sure that the
+ searching and matching functions should not call alloca. On some
+ systems, alloca is implemented in terms of malloc, and if we're
+ using the relocating allocator routines, then malloc could cause a
+ relocation, which might (if the strings being searched are in the
+ ralloc heap) shift the data out from underneath the regexp
+ routines.
+
+ Here's another reason to avoid allocation: Emacs
+ processes input from X in a signal handler; processing X input may
+ call malloc; if input arrives while a matching routine is calling
+ malloc, then we're scrod. But Emacs can't just block input while
+ calling matching routines; then we don't notice interrupts when
+ they come in. So, Emacs blocks input around all regexp calls
+ except the matching calls, which it leaves unprotected, in the
+ faith that they will not malloc. */
+
+/* Normally, this is fine. */
+#define MATCH_MAY_ALLOCATE
+
+/* When using GNU C, we are not REALLY using the C alloca, no matter
+ what config.h may say. So don't take precautions for it. */
+#ifdef __GNUC__
+#undef C_ALLOCA
+#endif
+
+/* The match routines may not allocate if (1) they would do it with malloc
+ and (2) it's not safe for them to use malloc.
+ Note that if REL_ALLOC is defined, matching would not use malloc for the
+ failure stack, but we would still use it for the register vectors;
+ so REL_ALLOC should not affect this. */
+#if (defined (C_ALLOCA) || defined (REGEX_MALLOC)) && defined (emacs)
+#undef MATCH_MAY_ALLOCATE
+#endif
+
+
+/* Failure stack declarations and macros; both re_compile_fastmap and
+ re_match_2 use a failure stack. These have to be macros because of
+ REGEX_ALLOCATE_STACK. */
+
+
+/* Number of failure points for which to initially allocate space
+ when matching. If this number is exceeded, we allocate more
+ space, so it is not a hard limit. */
+#ifndef INIT_FAILURE_ALLOC
+#define INIT_FAILURE_ALLOC 5
+#endif
+
+/* Roughly the maximum number of failure points on the stack. Would be
+ exactly that if always used MAX_FAILURE_ITEMS items each time we failed.
+ This is a variable only so users of regex can assign to it; we never
+ change it ourselves. */
+
+#ifdef INT_IS_16BIT
+
+#if defined (MATCH_MAY_ALLOCATE)
+/* 4400 was enough to cause a crash on Alpha OSF/1,
+ whose default stack limit is 2mb. */
+long int re_max_failures = 4000;
+#else
+long int re_max_failures = 2000;
+#endif
+
+union fail_stack_elt
+{
+ unsigned char *pointer;
+ long int integer;
+};
+
+typedef union fail_stack_elt fail_stack_elt_t;
+
+typedef struct
+{
+ fail_stack_elt_t *stack;
+ unsigned long int size;
+ unsigned long int avail; /* Offset of next open position. */
+} fail_stack_type;
+
+#else /* not INT_IS_16BIT */
+
+#if defined (MATCH_MAY_ALLOCATE)
+/* 4400 was enough to cause a crash on Alpha OSF/1,
+ whose default stack limit is 2mb. */
+int re_max_failures = 20000;
+#else
int re_max_failures = 2000;
+#endif
+
+union fail_stack_elt
+{
+ unsigned char *pointer;
+ int integer;
+};
+
+typedef union fail_stack_elt fail_stack_elt_t;
+
+typedef struct
+{
+ fail_stack_elt_t *stack;
+ unsigned size;
+ unsigned avail; /* Offset of next open position. */
+} fail_stack_type;
+
+#endif /* INT_IS_16BIT */
+
+#define FAIL_STACK_EMPTY() (fail_stack.avail == 0)
+#define FAIL_STACK_PTR_EMPTY() (fail_stack_ptr->avail == 0)
+#define FAIL_STACK_FULL() (fail_stack.avail == fail_stack.size)
+
+
+/* Define macros to initialize and free the failure stack.
+ Do `return -2' if the alloc fails. */
+
+#ifdef MATCH_MAY_ALLOCATE
+#define INIT_FAIL_STACK() \
+ do { \
+ fail_stack.stack = (fail_stack_elt_t *) \
+ REGEX_ALLOCATE_STACK (INIT_FAILURE_ALLOC * sizeof (fail_stack_elt_t)); \
+ \
+ if (fail_stack.stack == NULL) \
+ return -2; \
+ \
+ fail_stack.size = INIT_FAILURE_ALLOC; \
+ fail_stack.avail = 0; \
+ } while (0)
+
+#define RESET_FAIL_STACK() REGEX_FREE_STACK (fail_stack.stack)
+#else
+#define INIT_FAIL_STACK() \
+ do { \
+ fail_stack.avail = 0; \
+ } while (0)
+
+#define RESET_FAIL_STACK()
+#endif
+
+
+/* Double the size of FAIL_STACK, up to approximately `re_max_failures' items.
+
+ Return 1 if succeeds, and 0 if either ran out of memory
+ allocating space for it or it was already too large.
+
+ REGEX_REALLOCATE_STACK requires `destination' be declared. */
+
+#define DOUBLE_FAIL_STACK(fail_stack) \
+ ((fail_stack).size > (unsigned) (re_max_failures * MAX_FAILURE_ITEMS) \
+ ? 0 \
+ : ((fail_stack).stack = (fail_stack_elt_t *) \
+ REGEX_REALLOCATE_STACK ((fail_stack).stack, \
+ (fail_stack).size * sizeof (fail_stack_elt_t), \
+ ((fail_stack).size << 1) * sizeof (fail_stack_elt_t)), \
+ \
+ (fail_stack).stack == NULL \
+ ? 0 \
+ : ((fail_stack).size <<= 1, \
+ 1)))
+
+
+/* Push pointer POINTER on FAIL_STACK.
+ Return 1 if was able to do so and 0 if ran out of memory allocating
+ space to do so. */
+#define PUSH_PATTERN_OP(POINTER, FAIL_STACK) \
+ ((FAIL_STACK_FULL () \
+ && !DOUBLE_FAIL_STACK (FAIL_STACK)) \
+ ? 0 \
+ : ((FAIL_STACK).stack[(FAIL_STACK).avail++].pointer = POINTER, \
+ 1))
+
+/* Push a pointer value onto the failure stack.
+ Assumes the variable `fail_stack'. Probably should only
+ be called from within `PUSH_FAILURE_POINT'. */
+#define PUSH_FAILURE_POINTER(item) \
+ fail_stack.stack[fail_stack.avail++].pointer = (unsigned char *) (item)
+
+/* This pushes an integer-valued item onto the failure stack.
+ Assumes the variable `fail_stack'. Probably should only
+ be called from within `PUSH_FAILURE_POINT'. */
+#define PUSH_FAILURE_INT(item) \
+ fail_stack.stack[fail_stack.avail++].integer = (item)
+
+/* Push a fail_stack_elt_t value onto the failure stack.
+ Assumes the variable `fail_stack'. Probably should only
+ be called from within `PUSH_FAILURE_POINT'. */
+#define PUSH_FAILURE_ELT(item) \
+ fail_stack.stack[fail_stack.avail++] = (item)
+
+/* These three POP... operations complement the three PUSH... operations.
+ All assume that `fail_stack' is nonempty. */
+#define POP_FAILURE_POINTER() fail_stack.stack[--fail_stack.avail].pointer
+#define POP_FAILURE_INT() fail_stack.stack[--fail_stack.avail].integer
+#define POP_FAILURE_ELT() fail_stack.stack[--fail_stack.avail]
+
+/* Used to omit pushing failure point id's when we're not debugging. */
+#ifdef DEBUG
+#define DEBUG_PUSH PUSH_FAILURE_INT
+#define DEBUG_POP(item_addr) (item_addr)->integer = POP_FAILURE_INT ()
+#else
+#define DEBUG_PUSH(item)
+#define DEBUG_POP(item_addr)
+#endif
+
+
+/* Push the information about the state we will need
+ if we ever fail back to it.
+
+ Requires variables fail_stack, regstart, regend, reg_info, and
+ num_regs be declared. DOUBLE_FAIL_STACK requires `destination' be
+ declared.
+
+ Does `return FAILURE_CODE' if runs out of memory. */
+
+#define PUSH_FAILURE_POINT(pattern_place, string_place, failure_code) \
+ do { \
+ char *destination; \
+ /* Must be int, so when we don't save any registers, the arithmetic \
+ of 0 + -1 isn't done as unsigned. */ \
+ /* Can't be int, since there is not a shred of a guarantee that int \
+ is wide enough to hold a value of something to which pointer can \
+ be assigned */ \
+ s_reg_t this_reg; \
+ \
+ DEBUG_STATEMENT (failure_id++); \
+ DEBUG_STATEMENT (nfailure_points_pushed++); \
+ DEBUG_PRINT2 ("\nPUSH_FAILURE_POINT #%u:\n", failure_id); \
+ DEBUG_PRINT2 (" Before push, next avail: %d\n", (fail_stack).avail);\
+ DEBUG_PRINT2 (" size: %d\n", (fail_stack).size);\
+ \
+ DEBUG_PRINT2 (" slots needed: %d\n", NUM_FAILURE_ITEMS); \
+ DEBUG_PRINT2 (" available: %d\n", REMAINING_AVAIL_SLOTS); \
+ \
+ /* Ensure we have enough space allocated for what we will push. */ \
+ while (REMAINING_AVAIL_SLOTS < NUM_FAILURE_ITEMS) \
+ { \
+ if (!DOUBLE_FAIL_STACK (fail_stack)) \
+ return failure_code; \
+ \
+ DEBUG_PRINT2 ("\n Doubled stack; size now: %d\n", \
+ (fail_stack).size); \
+ DEBUG_PRINT2 (" slots available: %d\n", REMAINING_AVAIL_SLOTS);\
+ } \
+ \
+ /* Push the info, starting with the registers. */ \
+ DEBUG_PRINT1 ("\n"); \
+ \
+ if (1) \
+ for (this_reg = lowest_active_reg; this_reg <= highest_active_reg; \
+ this_reg++) \
+ { \
+ DEBUG_PRINT2 (" Pushing reg: %d\n", this_reg); \
+ DEBUG_STATEMENT (num_regs_pushed++); \
+ \
+ DEBUG_PRINT2 (" start: 0x%x\n", regstart[this_reg]); \
+ PUSH_FAILURE_POINTER (regstart[this_reg]); \
+ \
+ DEBUG_PRINT2 (" end: 0x%x\n", regend[this_reg]); \
+ PUSH_FAILURE_POINTER (regend[this_reg]); \
+ \
+ DEBUG_PRINT2 (" info: 0x%x\n ", reg_info[this_reg]); \
+ DEBUG_PRINT2 (" match_null=%d", \
+ REG_MATCH_NULL_STRING_P (reg_info[this_reg])); \
+ DEBUG_PRINT2 (" active=%d", IS_ACTIVE (reg_info[this_reg])); \
+ DEBUG_PRINT2 (" matched_something=%d", \
+ MATCHED_SOMETHING (reg_info[this_reg])); \
+ DEBUG_PRINT2 (" ever_matched=%d", \
+ EVER_MATCHED_SOMETHING (reg_info[this_reg])); \
+ DEBUG_PRINT1 ("\n"); \
+ PUSH_FAILURE_ELT (reg_info[this_reg].word); \
+ } \
+ \
+ DEBUG_PRINT2 (" Pushing low active reg: %d\n", lowest_active_reg);\
+ PUSH_FAILURE_INT (lowest_active_reg); \
+ \
+ DEBUG_PRINT2 (" Pushing high active reg: %d\n", highest_active_reg);\
+ PUSH_FAILURE_INT (highest_active_reg); \
+ \
+ DEBUG_PRINT2 (" Pushing pattern 0x%x:\n", pattern_place); \
+ DEBUG_PRINT_COMPILED_PATTERN (bufp, pattern_place, pend); \
+ PUSH_FAILURE_POINTER (pattern_place); \
+ \
+ DEBUG_PRINT2 (" Pushing string 0x%x: `", string_place); \
+ DEBUG_PRINT_DOUBLE_STRING (string_place, string1, size1, string2, \
+ size2); \
+ DEBUG_PRINT1 ("'\n"); \
+ PUSH_FAILURE_POINTER (string_place); \
+ \
+ DEBUG_PRINT2 (" Pushing failure id: %u\n", failure_id); \
+ DEBUG_PUSH (failure_id); \
+ } while (0)
+
+/* This is the number of items that are pushed and popped on the stack
+ for each register. */
+#define NUM_REG_ITEMS 3
+
+/* Individual items aside from the registers. */
+#ifdef DEBUG
+#define NUM_NONREG_ITEMS 5 /* Includes failure point id. */
+#else
+#define NUM_NONREG_ITEMS 4
+#endif
+
+/* We push at most this many items on the stack. */
+/* We used to use (num_regs - 1), which is the number of registers
+ this regexp will save; but that was changed to 5
+ to avoid stack overflow for a regexp with lots of parens. */
+#define MAX_FAILURE_ITEMS (5 * NUM_REG_ITEMS + NUM_NONREG_ITEMS)
+
+/* We actually push this many items. */
+#define NUM_FAILURE_ITEMS \
+ (((0 \
+ ? 0 : highest_active_reg - lowest_active_reg + 1) \
+ * NUM_REG_ITEMS) \
+ + NUM_NONREG_ITEMS)
+
+/* How many items can still be added to the stack without overflowing it. */
+#define REMAINING_AVAIL_SLOTS ((fail_stack).size - (fail_stack).avail)
+
+
+/* Pops what PUSH_FAIL_STACK pushes.
+
+ We restore into the parameters, all of which should be lvalues:
+ STR -- the saved data position.
+ PAT -- the saved pattern position.
+ LOW_REG, HIGH_REG -- the highest and lowest active registers.
+ REGSTART, REGEND -- arrays of string positions.
+ REG_INFO -- array of information about each subexpression.
+
+ Also assumes the variables `fail_stack' and (if debugging), `bufp',
+ `pend', `string1', `size1', `string2', and `size2'. */
+
+#define POP_FAILURE_POINT(str, pat, low_reg, high_reg, regstart, regend, reg_info)\
+{ \
+ DEBUG_STATEMENT (fail_stack_elt_t failure_id;) \
+ s_reg_t this_reg; \
+ const unsigned char *string_temp; \
+ \
+ assert (!FAIL_STACK_EMPTY ()); \
+ \
+ /* Remove failure points and point to how many regs pushed. */ \
+ DEBUG_PRINT1 ("POP_FAILURE_POINT:\n"); \
+ DEBUG_PRINT2 (" Before pop, next avail: %d\n", fail_stack.avail); \
+ DEBUG_PRINT2 (" size: %d\n", fail_stack.size); \
+ \
+ assert (fail_stack.avail >= NUM_NONREG_ITEMS); \
+ \
+ DEBUG_POP (&failure_id); \
+ DEBUG_PRINT2 (" Popping failure id: %u\n", failure_id); \
+ \
+ /* If the saved string location is NULL, it came from an \
+ on_failure_keep_string_jump opcode, and we want to throw away the \
+ saved NULL, thus retaining our current position in the string. */ \
+ string_temp = POP_FAILURE_POINTER (); \
+ if (string_temp != NULL) \
+ str = (const char *) string_temp; \
+ \
+ DEBUG_PRINT2 (" Popping string 0x%x: `", str); \
+ DEBUG_PRINT_DOUBLE_STRING (str, string1, size1, string2, size2); \
+ DEBUG_PRINT1 ("'\n"); \
+ \
+ pat = (unsigned char *) POP_FAILURE_POINTER (); \
+ DEBUG_PRINT2 (" Popping pattern 0x%x:\n", pat); \
+ DEBUG_PRINT_COMPILED_PATTERN (bufp, pat, pend); \
+ \
+ /* Restore register info. */ \
+ high_reg = (active_reg_t) POP_FAILURE_INT (); \
+ DEBUG_PRINT2 (" Popping high active reg: %d\n", high_reg); \
+ \
+ low_reg = (active_reg_t) POP_FAILURE_INT (); \
+ DEBUG_PRINT2 (" Popping low active reg: %d\n", low_reg); \
+ \
+ if (1) \
+ for (this_reg = high_reg; this_reg >= low_reg; this_reg--) \
+ { \
+ DEBUG_PRINT2 (" Popping reg: %d\n", this_reg); \
+ \
+ reg_info[this_reg].word = POP_FAILURE_ELT (); \
+ DEBUG_PRINT2 (" info: 0x%x\n", reg_info[this_reg]); \
+ \
+ regend[this_reg] = (const char *) POP_FAILURE_POINTER (); \
+ DEBUG_PRINT2 (" end: 0x%x\n", regend[this_reg]); \
+ \
+ regstart[this_reg] = (const char *) POP_FAILURE_POINTER (); \
+ DEBUG_PRINT2 (" start: 0x%x\n", regstart[this_reg]); \
+ } \
+ else \
+ { \
+ for (this_reg = highest_active_reg; this_reg > high_reg; this_reg--) \
+ { \
+ reg_info[this_reg].word.integer = 0; \
+ regend[this_reg] = 0; \
+ regstart[this_reg] = 0; \
+ } \
+ highest_active_reg = high_reg; \
+ } \
+ \
+ set_regs_matched_done = 0; \
+ DEBUG_STATEMENT (nfailure_points_popped++); \
+} /* POP_FAILURE_POINT */
+
+
+
+/* Structure for per-register (a.k.a. per-group) information.
+ Other register information, such as the
+ starting and ending positions (which are addresses), and the list of
+ inner groups (which is a bits list) are maintained in separate
+ variables.
+
+ We are making a (strictly speaking) nonportable assumption here: that
+ the compiler will pack our bit fields into something that fits into
+ the type of `word', i.e., is something that fits into one item on the
+ failure stack. */
+
+
+/* Declarations and macros for re_match_2. */
+
+typedef union
+{
+ fail_stack_elt_t word;
+ struct
+ {
+ /* This field is one if this group can match the empty string,
+ zero if not. If not yet determined, `MATCH_NULL_UNSET_VALUE'. */
+#define MATCH_NULL_UNSET_VALUE 3
+ unsigned match_null_string_p : 2;
+ unsigned is_active : 1;
+ unsigned matched_something : 1;
+ unsigned ever_matched_something : 1;
+ } bits;
+} register_info_type;
+
+#define REG_MATCH_NULL_STRING_P(R) ((R).bits.match_null_string_p)
+#define IS_ACTIVE(R) ((R).bits.is_active)
+#define MATCHED_SOMETHING(R) ((R).bits.matched_something)
+#define EVER_MATCHED_SOMETHING(R) ((R).bits.ever_matched_something)
+
+
+/* Call this when have matched a real character; it sets `matched' flags
+ for the subexpressions which we are currently inside. Also records
+ that those subexprs have matched. */
+#define SET_REGS_MATCHED() \
+ do \
+ { \
+ if (!set_regs_matched_done) \
+ { \
+ active_reg_t r; \
+ set_regs_matched_done = 1; \
+ for (r = lowest_active_reg; r <= highest_active_reg; r++) \
+ { \
+ MATCHED_SOMETHING (reg_info[r]) \
+ = EVER_MATCHED_SOMETHING (reg_info[r]) \
+ = 1; \
+ } \
+ } \
+ } \
+ while (0)
+
+/* Registers are set to a sentinel when they haven't yet matched. */
+static char reg_unset_dummy;
+#define REG_UNSET_VALUE (®_unset_dummy)
+#define REG_UNSET(e) ((e) == REG_UNSET_VALUE)
+
+/* Subroutine declarations and macros for regex_compile. */
+
+static reg_errcode_t regex_compile _RE_ARGS ((const char *pattern, size_t size,
+ reg_syntax_t syntax,
+ struct re_pattern_buffer *bufp));
+static void store_op1 _RE_ARGS ((re_opcode_t op, unsigned char *loc, int arg));
+static void store_op2 _RE_ARGS ((re_opcode_t op, unsigned char *loc,
+ int arg1, int arg2));
+static void insert_op1 _RE_ARGS ((re_opcode_t op, unsigned char *loc,
+ int arg, unsigned char *end));
+static void insert_op2 _RE_ARGS ((re_opcode_t op, unsigned char *loc,
+ int arg1, int arg2, unsigned char *end));
+static boolean at_begline_loc_p _RE_ARGS ((const char *pattern, const char *p,
+ reg_syntax_t syntax));
+static boolean at_endline_loc_p _RE_ARGS ((const char *p, const char *pend,
+ reg_syntax_t syntax));
+static reg_errcode_t compile_range _RE_ARGS ((const char **p_ptr,
+ const char *pend,
+ char *translate,
+ reg_syntax_t syntax,
+ unsigned char *b));
+
+/* Fetch the next character in the uncompiled pattern---translating it
+ if necessary. Also cast from a signed character in the constant
+ string passed to us by the user to an unsigned char that we can use
+ as an array index (in, e.g., `translate'). */
+#ifndef PATFETCH
+#define PATFETCH(c) \
+ do {if (p == pend) return REG_EEND; \
+ c = (unsigned char) *p++; \
+ if (translate) c = (unsigned char) translate[c]; \
+ } while (0)
+#endif
+
+/* Fetch the next character in the uncompiled pattern, with no
+ translation. */
+#define PATFETCH_RAW(c) \
+ do {if (p == pend) return REG_EEND; \
+ c = (unsigned char) *p++; \
+ } while (0)
+
+/* Go backwards one character in the pattern. */
+#define PATUNFETCH p--
+
+
+/* If `translate' is non-null, return translate[D], else just D. We
+ cast the subscript to translate because some data is declared as
+ `char *', to avoid warnings when a string constant is passed. But
+ when we use a character as a subscript we must make it unsigned. */
+#ifndef TRANSLATE
+#define TRANSLATE(d) \
+ (translate ? (char) translate[(unsigned char) (d)] : (d))
+#endif
+
+
+/* Macros for outputting the compiled pattern into `buffer'. */
+
+/* If the buffer isn't allocated when it comes in, use this. */
+#define INIT_BUF_SIZE 32
+
+/* Make sure we have at least N more bytes of space in buffer. */
+#define GET_BUFFER_SPACE(n) \
+ while ((unsigned long) (b - bufp->buffer + (n)) > bufp->allocated) \
+ EXTEND_BUFFER ()
+
+/* Make sure we have one more byte of buffer space and then add C to it. */
+#define BUF_PUSH(c) \
+ do { \
+ GET_BUFFER_SPACE (1); \
+ *b++ = (unsigned char) (c); \
+ } while (0)
+
+
+/* Ensure we have two more bytes of buffer space and then append C1 and C2. */
+#define BUF_PUSH_2(c1, c2) \
+ do { \
+ GET_BUFFER_SPACE (2); \
+ *b++ = (unsigned char) (c1); \
+ *b++ = (unsigned char) (c2); \
+ } while (0)
+
+
+/* As with BUF_PUSH_2, except for three bytes. */
+#define BUF_PUSH_3(c1, c2, c3) \
+ do { \
+ GET_BUFFER_SPACE (3); \
+ *b++ = (unsigned char) (c1); \
+ *b++ = (unsigned char) (c2); \
+ *b++ = (unsigned char) (c3); \
+ } while (0)
+
+
+/* Store a jump with opcode OP at LOC to location TO. We store a
+ relative address offset by the three bytes the jump itself occupies. */
+#define STORE_JUMP(op, loc, to) \
+ store_op1 (op, loc, (int) ((to) - (loc) - 3))
+
+/* Likewise, for a two-argument jump. */
+#define STORE_JUMP2(op, loc, to, arg) \
+ store_op2 (op, loc, (int) ((to) - (loc) - 3), arg)
+
+/* Like `STORE_JUMP', but for inserting. Assume `b' is the buffer end. */
+#define INSERT_JUMP(op, loc, to) \
+ insert_op1 (op, loc, (int) ((to) - (loc) - 3), b)
+
+/* Like `STORE_JUMP2', but for inserting. Assume `b' is the buffer end. */
+#define INSERT_JUMP2(op, loc, to, arg) \
+ insert_op2 (op, loc, (int) ((to) - (loc) - 3), arg, b)
+
+
+/* This is not an arbitrary limit: the arguments which represent offsets
+ into the pattern are two bytes long. So if 2^16 bytes turns out to
+ be too small, many things would have to change. */
+/* Any other compiler which, like MSC, has allocation limit below 2^16
+ bytes will have to use approach similar to what was done below for
+ MSC and drop MAX_BUF_SIZE a bit. Otherwise you may end up
+ reallocating to 0 bytes. Such thing is not going to work too well.
+ You have been warned!! */
+#if defined(_MSC_VER) && !defined(WIN32)
+/* Microsoft C 16-bit versions limit malloc to approx 65512 bytes.
+ The REALLOC define eliminates a flurry of conversion warnings,
+ but is not required. */
+#define MAX_BUF_SIZE 65500L
+#define REALLOC(p,s) realloc ((p), (size_t) (s))
+#else
+#define MAX_BUF_SIZE (1L << 16)
+#define REALLOC(p,s) realloc ((p), (s))
+#endif
+
+/* Extend the buffer by twice its current size via realloc and
+ reset the pointers that pointed into the old block to point to the
+ correct places in the new one. If extending the buffer results in it
+ being larger than MAX_BUF_SIZE, then flag memory exhausted. */
+#define EXTEND_BUFFER() \
+ do { \
+ unsigned char *old_buffer = bufp->buffer; \
+ if (bufp->allocated == MAX_BUF_SIZE) \
+ return REG_ESIZE; \
+ bufp->allocated <<= 1; \
+ if (bufp->allocated > MAX_BUF_SIZE) \
+ bufp->allocated = MAX_BUF_SIZE; \
+ bufp->buffer = (unsigned char *) REALLOC (bufp->buffer, bufp->allocated);\
+ if (bufp->buffer == NULL) \
+ return REG_ESPACE; \
+ /* If the buffer moved, move all the pointers into it. */ \
+ if (old_buffer != bufp->buffer) \
+ { \
+ b = (b - old_buffer) + bufp->buffer; \
+ begalt = (begalt - old_buffer) + bufp->buffer; \
+ if (fixup_alt_jump) \
+ fixup_alt_jump = (fixup_alt_jump - old_buffer) + bufp->buffer;\
+ if (laststart) \
+ laststart = (laststart - old_buffer) + bufp->buffer; \
+ if (pending_exact) \
+ pending_exact = (pending_exact - old_buffer) + bufp->buffer; \
+ } \
+ } while (0)
+
+
+/* Since we have one byte reserved for the register number argument to
+ {start,stop}_memory, the maximum number of groups we can report
+ things about is what fits in that byte. */
+#define MAX_REGNUM 255
+
+/* But patterns can have more than `MAX_REGNUM' registers. We just
+ ignore the excess. */
+typedef unsigned regnum_t;
+
+
+/* Macros for the compile stack. */
+
+/* Since offsets can go either forwards or backwards, this type needs to
+ be able to hold values from -(MAX_BUF_SIZE - 1) to MAX_BUF_SIZE - 1. */
+/* int may be not enough when sizeof(int) == 2. */
+typedef long pattern_offset_t;
+
+typedef struct
+{
+ pattern_offset_t begalt_offset;
+ pattern_offset_t fixup_alt_jump;
+ pattern_offset_t inner_group_offset;
+ pattern_offset_t laststart_offset;
+ regnum_t regnum;
+} compile_stack_elt_t;
+
+
+typedef struct
+{
+ compile_stack_elt_t *stack;
+ unsigned size;
+ unsigned avail; /* Offset of next open position. */
+} compile_stack_type;
+
+
+#define INIT_COMPILE_STACK_SIZE 32
+
+#define COMPILE_STACK_EMPTY (compile_stack.avail == 0)
+#define COMPILE_STACK_FULL (compile_stack.avail == compile_stack.size)
+
+/* The next available element. */
+#define COMPILE_STACK_TOP (compile_stack.stack[compile_stack.avail])
+
+
+/* Set the bit for character C in a list. */
+#define SET_LIST_BIT(c) \
+ (b[((unsigned char) (c)) / BYTEWIDTH] \
+ |= 1 << (((unsigned char) c) % BYTEWIDTH))
+
+
+/* Get the next unsigned number in the uncompiled pattern. */
+#define GET_UNSIGNED_NUMBER(num) \
+ { if (p != pend) \
+ { \
+ PATFETCH (c); \
+ while (ISDIGIT (c)) \
+ { \
+ if (num < 0) \
+ num = 0; \
+ num = num * 10 + c - '0'; \
+ if (p == pend) \
+ break; \
+ PATFETCH (c); \
+ } \
+ } \
+ }
+
+#if defined _LIBC || (defined HAVE_WCTYPE_H && defined HAVE_WCHAR_H)
+/* The GNU C library provides support for user-defined character classes
+ and the functions from ISO C amendement 1. */
+# ifdef CHARCLASS_NAME_MAX
+# define CHAR_CLASS_MAX_LENGTH CHARCLASS_NAME_MAX
+# else
+/* This shouldn't happen but some implementation might still have this
+ problem. Use a reasonable default value. */
+# define CHAR_CLASS_MAX_LENGTH 256
# endif
+
+# define IS_CHAR_CLASS(string) wctype (string)
+#else
+# define CHAR_CLASS_MAX_LENGTH 6 /* Namely, `xdigit'. */
+
+# define IS_CHAR_CLASS(string) \
+ (STREQ (string, "alpha") || STREQ (string, "upper") \
+ || STREQ (string, "lower") || STREQ (string, "digit") \
+ || STREQ (string, "alnum") || STREQ (string, "xdigit") \
+ || STREQ (string, "space") || STREQ (string, "print") \
+ || STREQ (string, "punct") || STREQ (string, "graph") \
+ || STREQ (string, "cntrl") || STREQ (string, "blank"))
#endif
+
+#ifndef MATCH_MAY_ALLOCATE
+
+/* If we cannot allocate large objects within re_match_2_internal,
+ we make the fail stack and register vectors global.
+ The fail stack, we grow to the maximum size when a regexp
+ is compiled.
+ The register vectors, we adjust in size each time we
+ compile a regexp, according to the number of registers it needs. */
+
+static fail_stack_type fail_stack;
+
+/* Size with which the following vectors are currently allocated.
+ That is so we can make them bigger as needed,
+ but never make them smaller. */
+static int regs_allocated_size;
+
+static const char ** regstart, ** regend;
+static const char ** old_regstart, ** old_regend;
+static const char **best_regstart, **best_regend;
+static register_info_type *reg_info;
+static const char **reg_dummy;
+static register_info_type *reg_info_dummy;
+
+/* Make the register vectors big enough for NUM_REGS registers,
+ but don't make them smaller. */
+
+static
+regex_grow_registers (num_regs)
+ int num_regs;
+{
+ if (num_regs > regs_allocated_size)
+ {
+ RETALLOC_IF (regstart, num_regs, const char *);
+ RETALLOC_IF (regend, num_regs, const char *);
+ RETALLOC_IF (old_regstart, num_regs, const char *);
+ RETALLOC_IF (old_regend, num_regs, const char *);
+ RETALLOC_IF (best_regstart, num_regs, const char *);
+ RETALLOC_IF (best_regend, num_regs, const char *);
+ RETALLOC_IF (reg_info, num_regs, register_info_type);
+ RETALLOC_IF (reg_dummy, num_regs, const char *);
+ RETALLOC_IF (reg_info_dummy, num_regs, register_info_type);
+
+ regs_allocated_size = num_regs;
+ }
+}
+
+#endif /* not MATCH_MAY_ALLOCATE */
+
+static boolean group_in_compile_stack _RE_ARGS ((compile_stack_type
+ compile_stack,
+ regnum_t regnum));
+
+/* `regex_compile' compiles PATTERN (of length SIZE) according to SYNTAX.
+ Returns one of error codes defined in `regex.h', or zero for success.
+
+ Assumes the `allocated' (and perhaps `buffer') and `translate'
+ fields are set in BUFP on entry.
+
+ If it succeeds, results are put in BUFP (if it returns an error, the
+ contents of BUFP are undefined):
+ `buffer' is the compiled pattern;
+ `syntax' is set to SYNTAX;
+ `used' is set to the length of the compiled pattern;
+ `fastmap_accurate' is zero;
+ `re_nsub' is the number of subexpressions in PATTERN;
+ `not_bol' and `not_eol' are zero;
+
+ The `fastmap' and `newline_anchor' fields are neither
+ examined nor set. */
+
+/* Return, freeing storage we allocated. */
+#define FREE_STACK_RETURN(value) \
+ return (free (compile_stack.stack), value)
+
+static reg_errcode_t
+regex_compile (pattern, size, syntax, bufp)
+ const char *pattern;
+ size_t size;
+ reg_syntax_t syntax;
+ struct re_pattern_buffer *bufp;
+{
+ /* We fetch characters from PATTERN here. Even though PATTERN is
+ `char *' (i.e., signed), we declare these variables as unsigned, so
+ they can be reliably used as array indices. */
+ register unsigned char c, c1;
+
+ /* A random temporary spot in PATTERN. */
+ const char *p1;
+
+ /* Points to the end of the buffer, where we should append. */
+ register unsigned char *b;
+
+ /* Keeps track of unclosed groups. */
+ compile_stack_type compile_stack;
+
+ /* Points to the current (ending) position in the pattern. */
+ const char *p = pattern;
+ const char *pend = pattern + size;
+
+ /* How to translate the characters in the pattern. */
+ RE_TRANSLATE_TYPE translate = bufp->translate;
+
+ /* Address of the count-byte of the most recently inserted `exactn'
+ command. This makes it possible to tell if a new exact-match
+ character can be added to that command or if the character requires
+ a new `exactn' command. */
+ unsigned char *pending_exact = 0;
+
+ /* Address of start of the most recently finished expression.
+ This tells, e.g., postfix * where to find the start of its
+ operand. Reset at the beginning of groups and alternatives. */
+ unsigned char *laststart = 0;
+
+ /* Address of beginning of regexp, or inside of last group. */
+ unsigned char *begalt;
+
+ /* Place in the uncompiled pattern (i.e., the {) to
+ which to go back if the interval is invalid. */
+ const char *beg_interval;
+
+ /* Address of the place where a forward jump should go to the end of
+ the containing expression. Each alternative of an `or' -- except the
+ last -- ends with a forward jump of this sort. */
+ unsigned char *fixup_alt_jump = 0;
+
+ /* Counts open-groups as they are encountered. Remembered for the
+ matching close-group on the compile stack, so the same register
+ number is put in the stop_memory as the start_memory. */
+ regnum_t regnum = 0;
+
+#ifdef DEBUG
+ DEBUG_PRINT1 ("\nCompiling pattern: ");
+ if (debug)
+ {
+ unsigned debug_count;
+
+ for (debug_count = 0; debug_count < size; debug_count++)
+ putchar (pattern[debug_count]);
+ putchar ('\n');
+ }
+#endif /* DEBUG */
+
+ /* Initialize the compile stack. */
+ compile_stack.stack = TALLOC (INIT_COMPILE_STACK_SIZE, compile_stack_elt_t);
+ if (compile_stack.stack == NULL)
+ return REG_ESPACE;
+
+ compile_stack.size = INIT_COMPILE_STACK_SIZE;
+ compile_stack.avail = 0;
+
+ /* Initialize the pattern buffer. */
+ bufp->syntax = syntax;
+ bufp->fastmap_accurate = 0;
+ bufp->not_bol = bufp->not_eol = 0;
+
+ /* Set `used' to zero, so that if we return an error, the pattern
+ printer (for debugging) will think there's no pattern. We reset it
+ at the end. */
+ bufp->used = 0;
+
+ /* Always count groups, whether or not bufp->no_sub is set. */
+ bufp->re_nsub = 0;
+
+#if !defined (emacs) && !defined (SYNTAX_TABLE)
+ /* Initialize the syntax table. */
+ init_syntax_once ();
+#endif
+
+ if (bufp->allocated == 0)
+ {
+ if (bufp->buffer)
+ { /* If zero allocated, but buffer is non-null, try to realloc
+ enough space. This loses if buffer's address is bogus, but
+ that is the user's responsibility. */
+ RETALLOC (bufp->buffer, INIT_BUF_SIZE, unsigned char);
+ }
+ else
+ { /* Caller did not allocate a buffer. Do it for them. */
+ bufp->buffer = TALLOC (INIT_BUF_SIZE, unsigned char);
+ }
+ if (!bufp->buffer) FREE_STACK_RETURN (REG_ESPACE);
+
+ bufp->allocated = INIT_BUF_SIZE;
+ }
+
+ begalt = b = bufp->buffer;
+
+ /* Loop through the uncompiled pattern until we're at the end. */
+ while (p != pend)
+ {
+ PATFETCH (c);
+
+ switch (c)
+ {
+ case '^':
+ {
+ if ( /* If at start of pattern, it's an operator. */
+ p == pattern + 1
+ /* If context independent, it's an operator. */
+ || syntax & RE_CONTEXT_INDEP_ANCHORS
+ /* Otherwise, depends on what's come before. */
+ || at_begline_loc_p (pattern, p, syntax))
+ BUF_PUSH (begline);
+ else
+ goto normal_char;
+ }
+ break;
+
+
+ case '$':
+ {
+ if ( /* If at end of pattern, it's an operator. */
+ p == pend
+ /* If context independent, it's an operator. */
+ || syntax & RE_CONTEXT_INDEP_ANCHORS
+ /* Otherwise, depends on what's next. */
+ || at_endline_loc_p (p, pend, syntax))
+ BUF_PUSH (endline);
+ else
+ goto normal_char;
+ }
+ break;
+
+
+ case '+':
+ case '?':
+ if ((syntax & RE_BK_PLUS_QM)
+ || (syntax & RE_LIMITED_OPS))
+ goto normal_char;
+ handle_plus:
+ case '*':
+ /* If there is no previous pattern... */
+ if (!laststart)
+ {
+ if (syntax & RE_CONTEXT_INVALID_OPS)
+ FREE_STACK_RETURN (REG_BADRPT);
+ else if (!(syntax & RE_CONTEXT_INDEP_OPS))
+ goto normal_char;
+ }
+
+ {
+ /* Are we optimizing this jump? */
+ boolean keep_string_p = false;
+
+ /* 1 means zero (many) matches is allowed. */
+ char zero_times_ok = 0, many_times_ok = 0;
+
+ /* If there is a sequence of repetition chars, collapse it
+ down to just one (the right one). We can't combine
+ interval operators with these because of, e.g., `a{2}*',
+ which should only match an even number of `a's. */
+
+ for (;;)
+ {
+ zero_times_ok |= c != '+';
+ many_times_ok |= c != '?';
+
+ if (p == pend)
+ break;
+
+ PATFETCH (c);
+
+ if (c == '*'
+ || (!(syntax & RE_BK_PLUS_QM) && (c == '+' || c == '?')))
+ ;
+
+ else if (syntax & RE_BK_PLUS_QM && c == '\\')
+ {
+ if (p == pend) FREE_STACK_RETURN (REG_EESCAPE);
+
+ PATFETCH (c1);
+ if (!(c1 == '+' || c1 == '?'))
+ {
+ PATUNFETCH;
+ PATUNFETCH;
+ break;
+ }
+
+ c = c1;
+ }
+ else
+ {
+ PATUNFETCH;
+ break;
+ }
+
+ /* If we get here, we found another repeat character. */
+ }
+
+ /* Star, etc. applied to an empty pattern is equivalent
+ to an empty pattern. */
+ if (!laststart)
+ break;
+
+ /* Now we know whether or not zero matches is allowed
+ and also whether or not two or more matches is allowed. */
+ if (many_times_ok)
+ { /* More than one repetition is allowed, so put in at the
+ end a backward relative jump from `b' to before the next
+ jump we're going to put in below (which jumps from
+ laststart to after this jump).
+
+ But if we are at the `*' in the exact sequence `.*\n',
+ insert an unconditional jump backwards to the .,
+ instead of the beginning of the loop. This way we only
+ push a failure point once, instead of every time
+ through the loop. */
+ assert (p - 1 > pattern);
+
+ /* Allocate the space for the jump. */
+ GET_BUFFER_SPACE (3);
+
+ /* We know we are not at the first character of the pattern,
+ because laststart was nonzero. And we've already
+ incremented `p', by the way, to be the character after
+ the `*'. Do we have to do something analogous here
+ for null bytes, because of RE_DOT_NOT_NULL? */
+ if (TRANSLATE (*(p - 2)) == TRANSLATE ('.')
+ && zero_times_ok
+ && p < pend && TRANSLATE (*p) == TRANSLATE ('\n')
+ && !(syntax & RE_DOT_NEWLINE))
+ { /* We have .*\n. */
+ STORE_JUMP (jump, b, laststart);
+ keep_string_p = true;
+ }
+ else
+ /* Anything else. */
+ STORE_JUMP (maybe_pop_jump, b, laststart - 3);
+
+ /* We've added more stuff to the buffer. */
+ b += 3;
+ }
+
+ /* On failure, jump from laststart to b + 3, which will be the
+ end of the buffer after this jump is inserted. */
+ GET_BUFFER_SPACE (3);
+ INSERT_JUMP (keep_string_p ? on_failure_keep_string_jump
+ : on_failure_jump,
+ laststart, b + 3);
+ pending_exact = 0;
+ b += 3;
+
+ if (!zero_times_ok)
+ {
+ /* At least one repetition is required, so insert a
+ `dummy_failure_jump' before the initial
+ `on_failure_jump' instruction of the loop. This
+ effects a skip over that instruction the first time
+ we hit that loop. */
+ GET_BUFFER_SPACE (3);
+ INSERT_JUMP (dummy_failure_jump, laststart, laststart + 6);
+ b += 3;
+ }
+ }
+ break;
+
+
+ case '.':
+ laststart = b;
+ BUF_PUSH (anychar);
+ break;
+
+
+ case '[':
+ {
+ boolean had_char_class = false;
+
+ if (p == pend) FREE_STACK_RETURN (REG_EBRACK);
+
+ /* Ensure that we have enough space to push a charset: the
+ opcode, the length count, and the bitset; 34 bytes in all. */
+ GET_BUFFER_SPACE (34);
+
+ laststart = b;
+
+ /* We test `*p == '^' twice, instead of using an if
+ statement, so we only need one BUF_PUSH. */
+ BUF_PUSH (*p == '^' ? charset_not : charset);
+ if (*p == '^')
+ p++;
+
+ /* Remember the first position in the bracket expression. */
+ p1 = p;
+
+ /* Push the number of bytes in the bitmap. */
+ BUF_PUSH ((1 << BYTEWIDTH) / BYTEWIDTH);
+
+ /* Clear the whole map. */
+ bzero (b, (1 << BYTEWIDTH) / BYTEWIDTH);
+
+ /* charset_not matches newline according to a syntax bit. */
+ if ((re_opcode_t) b[-2] == charset_not
+ && (syntax & RE_HAT_LISTS_NOT_NEWLINE))
+ SET_LIST_BIT ('\n');
+
+ /* Read in characters and ranges, setting map bits. */
+ for (;;)
+ {
+ if (p == pend) FREE_STACK_RETURN (REG_EBRACK);
+
+ PATFETCH (c);
+
+ /* \ might escape characters inside [...] and [^...]. */
+ if ((syntax & RE_BACKSLASH_ESCAPE_IN_LISTS) && c == '\\')
+ {
+ if (p == pend) FREE_STACK_RETURN (REG_EESCAPE);
+
+ PATFETCH (c1);
+ SET_LIST_BIT (c1);
+ continue;
+ }
+
+ /* Could be the end of the bracket expression. If it's
+ not (i.e., when the bracket expression is `[]' so
+ far), the ']' character bit gets set way below. */
+ if (c == ']' && p != p1 + 1)
+ break;
+
+ /* Look ahead to see if it's a range when the last thing
+ was a character class. */
+ if (had_char_class && c == '-' && *p != ']')
+ FREE_STACK_RETURN (REG_ERANGE);
+
+ /* Look ahead to see if it's a range when the last thing
+ was a character: if this is a hyphen not at the
+ beginning or the end of a list, then it's the range
+ operator. */
+ if (c == '-'
+ && !(p - 2 >= pattern && p[-2] == '[')
+ && !(p - 3 >= pattern && p[-3] == '[' && p[-2] == '^')
+ && *p != ']')
+ {
+ reg_errcode_t ret
+ = compile_range (&p, pend, translate, syntax, b);
+ if (ret != REG_NOERROR) FREE_STACK_RETURN (ret);
+ }
+
+ else if (p[0] == '-' && p[1] != ']')
+ { /* This handles ranges made up of characters only. */
+ reg_errcode_t ret;
+
+ /* Move past the `-'. */
+ PATFETCH (c1);
+
+ ret = compile_range (&p, pend, translate, syntax, b);
+ if (ret != REG_NOERROR) FREE_STACK_RETURN (ret);
+ }
+
+ /* See if we're at the beginning of a possible character
+ class. */
+
+ else if (syntax & RE_CHAR_CLASSES && c == '[' && *p == ':')
+ { /* Leave room for the null. */
+ char str[CHAR_CLASS_MAX_LENGTH + 1];
+
+ PATFETCH (c);
+ c1 = 0;
+
+ /* If pattern is `[[:'. */
+ if (p == pend) FREE_STACK_RETURN (REG_EBRACK);
+
+ for (;;)
+ {
+ PATFETCH (c);
+ if (c == ':' || c == ']' || p == pend
+ || c1 == CHAR_CLASS_MAX_LENGTH)
+ break;
+ str[c1++] = c;
+ }
+ str[c1] = '\0';
+
+ /* If isn't a word bracketed by `[:' and:`]':
+ undo the ending character, the letters, and leave
+ the leading `:' and `[' (but set bits for them). */
+ if (c == ':' && *p == ']')
+ {
+#if defined _LIBC || (defined HAVE_WCTYPE_H && defined HAVE_WCHAR_H)
+ boolean is_lower = STREQ (str, "lower");
+ boolean is_upper = STREQ (str, "upper");
+ wctype_t wt;
+ int ch;
+
+ wt = wctype (str);
+ if (wt == 0)
+ FREE_STACK_RETURN (REG_ECTYPE);
+
+ /* Throw away the ] at the end of the character
+ class. */
+ PATFETCH (c);
+
+ if (p == pend) FREE_STACK_RETURN (REG_EBRACK);
+
+ for (ch = 0; ch < 1 << BYTEWIDTH; ++ch)
+ {
+ if (iswctype (btowc (ch), wt))
+ SET_LIST_BIT (ch);
+
+ if (translate && (is_upper || is_lower)
+ && (ISUPPER (ch) || ISLOWER (ch)))
+ SET_LIST_BIT (ch);
+ }
+
+ had_char_class = true;
+#else
+ int ch;
+ boolean is_alnum = STREQ (str, "alnum");
+ boolean is_alpha = STREQ (str, "alpha");
+ boolean is_blank = STREQ (str, "blank");
+ boolean is_cntrl = STREQ (str, "cntrl");
+ boolean is_digit = STREQ (str, "digit");
+ boolean is_graph = STREQ (str, "graph");
+ boolean is_lower = STREQ (str, "lower");
+ boolean is_print = STREQ (str, "print");
+ boolean is_punct = STREQ (str, "punct");
+ boolean is_space = STREQ (str, "space");
+ boolean is_upper = STREQ (str, "upper");
+ boolean is_xdigit = STREQ (str, "xdigit");
+
+ if (!IS_CHAR_CLASS (str))
+ FREE_STACK_RETURN (REG_ECTYPE);
+
+ /* Throw away the ] at the end of the character
+ class. */
+ PATFETCH (c);
+
+ if (p == pend) FREE_STACK_RETURN (REG_EBRACK);
+
+ for (ch = 0; ch < (1 << BYTEWIDTH); ch++)
+ {
+ /* This was split into 3 if's to
+ avoid an arbitrary limit in some compiler. */
+ if ( (is_alnum && ISALNUM (ch))
+ || (is_alpha && ISALPHA (ch))
+ || (is_blank && ISBLANK (ch))
+ || (is_cntrl && ISCNTRL (ch)))
+ SET_LIST_BIT (ch);
+ if ( (is_digit && ISDIGIT (ch))
+ || (is_graph && ISGRAPH (ch))
+ || (is_lower && ISLOWER (ch))
+ || (is_print && ISPRINT (ch)))
+ SET_LIST_BIT (ch);
+ if ( (is_punct && ISPUNCT (ch))
+ || (is_space && ISSPACE (ch))
+ || (is_upper && ISUPPER (ch))
+ || (is_xdigit && ISXDIGIT (ch)))
+ SET_LIST_BIT (ch);
+ if ( translate && (is_upper || is_lower)
+ && (ISUPPER (ch) || ISLOWER (ch)))
+ SET_LIST_BIT (ch);
+ }
+ had_char_class = true;
+#endif /* libc || wctype.h */
+ }
+ else
+ {
+ c1++;
+ while (c1--)
+ PATUNFETCH;
+ SET_LIST_BIT ('[');
+ SET_LIST_BIT (':');
+ had_char_class = false;
+ }
+ }
+ else
+ {
+ had_char_class = false;
+ SET_LIST_BIT (c);
+ }
+ }
+
+ /* Discard any (non)matching list bytes that are all 0 at the
+ end of the map. Decrease the map-length byte too. */
+ while ((int) b[-1] > 0 && b[b[-1] - 1] == 0)
+ b[-1]--;
+ b += b[-1];
+ }
+ break;
+
+
+ case '(':
+ if (syntax & RE_NO_BK_PARENS)
+ goto handle_open;
+ else
+ goto normal_char;
+
+
+ case ')':
+ if (syntax & RE_NO_BK_PARENS)
+ goto handle_close;
+ else
+ goto normal_char;
+
+
+ case '\n':
+ if (syntax & RE_NEWLINE_ALT)
+ goto handle_alt;
+ else
+ goto normal_char;
+
+
+ case '|':
+ if (syntax & RE_NO_BK_VBAR)
+ goto handle_alt;
+ else
+ goto normal_char;
+
+
+ case '{':
+ if (syntax & RE_INTERVALS && syntax & RE_NO_BK_BRACES)
+ goto handle_interval;
+ else
+ goto normal_char;
+
+
+ case '\\':
+ if (p == pend) FREE_STACK_RETURN (REG_EESCAPE);
+
+ /* Do not translate the character after the \, so that we can
+ distinguish, e.g., \B from \b, even if we normally would
+ translate, e.g., B to b. */
+ PATFETCH_RAW (c);
+
+ switch (c)
+ {
+ case '(':
+ if (syntax & RE_NO_BK_PARENS)
+ goto normal_backslash;
+
+ handle_open:
+ bufp->re_nsub++;
+ regnum++;
+
+ if (COMPILE_STACK_FULL)
+ {
+ RETALLOC (compile_stack.stack, compile_stack.size << 1,
+ compile_stack_elt_t);
+ if (compile_stack.stack == NULL) return REG_ESPACE;
+
+ compile_stack.size <<= 1;
+ }
+
+ /* These are the values to restore when we hit end of this
+ group. They are all relative offsets, so that if the
+ whole pattern moves because of realloc, they will still
+ be valid. */
+ COMPILE_STACK_TOP.begalt_offset = begalt - bufp->buffer;
+ COMPILE_STACK_TOP.fixup_alt_jump
+ = fixup_alt_jump ? fixup_alt_jump - bufp->buffer + 1 : 0;
+ COMPILE_STACK_TOP.laststart_offset = b - bufp->buffer;
+ COMPILE_STACK_TOP.regnum = regnum;
+
+ /* We will eventually replace the 0 with the number of
+ groups inner to this one. But do not push a
+ start_memory for groups beyond the last one we can
+ represent in the compiled pattern. */
+ if (regnum <= MAX_REGNUM)
+ {
+ COMPILE_STACK_TOP.inner_group_offset = b - bufp->buffer + 2;
+ BUF_PUSH_3 (start_memory, regnum, 0);
+ }
+
+ compile_stack.avail++;
+
+ fixup_alt_jump = 0;
+ laststart = 0;
+ begalt = b;
+ /* If we've reached MAX_REGNUM groups, then this open
+ won't actually generate any code, so we'll have to
+ clear pending_exact explicitly. */
+ pending_exact = 0;
+ break;
+
+
+ case ')':
+ if (syntax & RE_NO_BK_PARENS) goto normal_backslash;
+
+ if (COMPILE_STACK_EMPTY) {
+ if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD)
+ goto normal_backslash;
+ }
+ else FREE_STACK_RETURN (REG_ERPAREN);
+
+ handle_close:
+ if (fixup_alt_jump)
+ { /* Push a dummy failure point at the end of the
+ alternative for a possible future
+ `pop_failure_jump' to pop. See comments at
+ `push_dummy_failure' in `re_match_2'. */
+ BUF_PUSH (push_dummy_failure);
+
+ /* We allocated space for this jump when we assigned
+ to `fixup_alt_jump', in the `handle_alt' case below. */
+ STORE_JUMP (jump_past_alt, fixup_alt_jump, b - 1);
+ }
+
+ /* See similar code for backslashed left paren above. */
+ if (COMPILE_STACK_EMPTY) {
+ if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD)
+ goto normal_char;
+ }
+ else FREE_STACK_RETURN (REG_ERPAREN);
+
+ /* Since we just checked for an empty stack above, this
+ ``can't happen''. */
+ assert (compile_stack.avail != 0);
+ {
+ /* We don't just want to restore into `regnum', because
+ later groups should continue to be numbered higher,
+ as in `(ab)c(de)' -- the second group is #2. */
+ regnum_t this_group_regnum;
+
+ compile_stack.avail--;
+ begalt = bufp->buffer + COMPILE_STACK_TOP.begalt_offset;
+ fixup_alt_jump
+ = COMPILE_STACK_TOP.fixup_alt_jump
+ ? bufp->buffer + COMPILE_STACK_TOP.fixup_alt_jump - 1
+ : 0;
+ laststart = bufp->buffer + COMPILE_STACK_TOP.laststart_offset;
+ this_group_regnum = COMPILE_STACK_TOP.regnum;
+ /* If we've reached MAX_REGNUM groups, then this open
+ won't actually generate any code, so we'll have to
+ clear pending_exact explicitly. */
+ pending_exact = 0;
+
+ /* We're at the end of the group, so now we know how many
+ groups were inside this one. */
+ if (this_group_regnum <= MAX_REGNUM)
+ {
+ unsigned char *inner_group_loc
+ = bufp->buffer + COMPILE_STACK_TOP.inner_group_offset;
+
+ *inner_group_loc = regnum - this_group_regnum;
+ BUF_PUSH_3 (stop_memory, this_group_regnum,
+ regnum - this_group_regnum);
+ }
+ }
+ break;
+
+
+ case '|': /* `\|'. */
+ if (syntax & RE_LIMITED_OPS || syntax & RE_NO_BK_VBAR)
+ goto normal_backslash;
+ handle_alt:
+ if (syntax & RE_LIMITED_OPS)
+ goto normal_char;
+
+ /* Insert before the previous alternative a jump which
+ jumps to this alternative if the former fails. */
+ GET_BUFFER_SPACE (3);
+ INSERT_JUMP (on_failure_jump, begalt, b + 6);
+ pending_exact = 0;
+ b += 3;
+
+ /* The alternative before this one has a jump after it
+ which gets executed if it gets matched. Adjust that
+ jump so it will jump to this alternative's analogous
+ jump (put in below, which in turn will jump to the next
+ (if any) alternative's such jump, etc.). The last such
+ jump jumps to the correct final destination. A picture:
+ _____ _____
+ | | | |
+ | v | v
+ a | b | c
+
+ If we are at `b', then fixup_alt_jump right now points to a
+ three-byte space after `a'. We'll put in the jump, set
+ fixup_alt_jump to right after `b', and leave behind three
+ bytes which we'll fill in when we get to after `c'. */
+
+ if (fixup_alt_jump)
+ STORE_JUMP (jump_past_alt, fixup_alt_jump, b);
+
+ /* Mark and leave space for a jump after this alternative,
+ to be filled in later either by next alternative or
+ when know we're at the end of a series of alternatives. */
+ fixup_alt_jump = b;
+ GET_BUFFER_SPACE (3);
+ b += 3;
+
+ laststart = 0;
+ begalt = b;
+ break;
+
+
+ case '{':
+ /* If \{ is a literal. */
+ if (!(syntax & RE_INTERVALS)
+ /* If we're at `\{' and it's not the open-interval
+ operator. */
+ || ((syntax & RE_INTERVALS) && (syntax & RE_NO_BK_BRACES))
+ || (p - 2 == pattern && p == pend))
+ goto normal_backslash;
+
+ handle_interval:
+ {
+ /* If got here, then the syntax allows intervals. */
+
+ /* At least (most) this many matches must be made. */
+ int lower_bound = -1, upper_bound = -1;
+
+ beg_interval = p - 1;
+
+ if (p == pend)
+ {
+ if (syntax & RE_NO_BK_BRACES)
+ goto unfetch_interval;
+ else
+ FREE_STACK_RETURN (REG_EBRACE);
+ }
+
+ GET_UNSIGNED_NUMBER (lower_bound);
+
+ if (c == ',')
+ {
+ GET_UNSIGNED_NUMBER (upper_bound);
+ if (upper_bound < 0) upper_bound = RE_DUP_MAX;
+ }
+ else
+ /* Interval such as `{1}' => match exactly once. */
+ upper_bound = lower_bound;
+
+ if (lower_bound < 0 || upper_bound > RE_DUP_MAX
+ || lower_bound > upper_bound)
+ {
+ if (syntax & RE_NO_BK_BRACES)
+ goto unfetch_interval;
+ else
+ FREE_STACK_RETURN (REG_BADBR);
+ }
+
+ if (!(syntax & RE_NO_BK_BRACES))
+ {
+ if (c != '\\') FREE_STACK_RETURN (REG_EBRACE);
+
+ PATFETCH (c);
+ }
+
+ if (c != '}')
+ {
+ if (syntax & RE_NO_BK_BRACES)
+ goto unfetch_interval;
+ else
+ FREE_STACK_RETURN (REG_BADBR);
+ }
+
+ /* We just parsed a valid interval. */
+
+ /* If it's invalid to have no preceding re. */
+ if (!laststart)
+ {
+ if (syntax & RE_CONTEXT_INVALID_OPS)
+ FREE_STACK_RETURN (REG_BADRPT);
+ else if (syntax & RE_CONTEXT_INDEP_OPS)
+ laststart = b;
+ else
+ goto unfetch_interval;
+ }
+
+ /* If the upper bound is zero, don't want to succeed at
+ all; jump from `laststart' to `b + 3', which will be
+ the end of the buffer after we insert the jump. */
+ if (upper_bound == 0)
+ {
+ GET_BUFFER_SPACE (3);
+ INSERT_JUMP (jump, laststart, b + 3);
+ b += 3;
+ }
+
+ /* Otherwise, we have a nontrivial interval. When
+ we're all done, the pattern will look like:
+ set_number_at <jump count> <upper bound>
+ set_number_at <succeed_n count> <lower bound>
+ succeed_n <after jump addr> <succeed_n count>
+ <body of loop>
+ jump_n <succeed_n addr> <jump count>
+ (The upper bound and `jump_n' are omitted if
+ `upper_bound' is 1, though.) */
+ else
+ { /* If the upper bound is > 1, we need to insert
+ more at the end of the loop. */
+ unsigned nbytes = 10 + (upper_bound > 1) * 10;
+
+ GET_BUFFER_SPACE (nbytes);
+
+ /* Initialize lower bound of the `succeed_n', even
+ though it will be set during matching by its
+ attendant `set_number_at' (inserted next),
+ because `re_compile_fastmap' needs to know.
+ Jump to the `jump_n' we might insert below. */
+ INSERT_JUMP2 (succeed_n, laststart,
+ b + 5 + (upper_bound > 1) * 5,
+ lower_bound);
+ b += 5;
+
+ /* Code to initialize the lower bound. Insert
+ before the `succeed_n'. The `5' is the last two
+ bytes of this `set_number_at', plus 3 bytes of
+ the following `succeed_n'. */
+ insert_op2 (set_number_at, laststart, 5, lower_bound, b);
+ b += 5;
+
+ if (upper_bound > 1)
+ { /* More than one repetition is allowed, so
+ append a backward jump to the `succeed_n'
+ that starts this interval.
+
+ When we've reached this during matching,
+ we'll have matched the interval once, so
+ jump back only `upper_bound - 1' times. */
+ STORE_JUMP2 (jump_n, b, laststart + 5,
+ upper_bound - 1);
+ b += 5;
+
+ /* The location we want to set is the second
+ parameter of the `jump_n'; that is `b-2' as
+ an absolute address. `laststart' will be
+ the `set_number_at' we're about to insert;
+ `laststart+3' the number to set, the source
+ for the relative address. But we are
+ inserting into the middle of the pattern --
+ so everything is getting moved up by 5.
+ Conclusion: (b - 2) - (laststart + 3) + 5,
+ i.e., b - laststart.
+
+ We insert this at the beginning of the loop
+ so that if we fail during matching, we'll
+ reinitialize the bounds. */
+ insert_op2 (set_number_at, laststart, b - laststart,
+ upper_bound - 1, b);
+ b += 5;
+ }
+ }
+ pending_exact = 0;
+ beg_interval = NULL;
+ }
+ break;
+
+ unfetch_interval:
+ /* If an invalid interval, match the characters as literals. */
+ assert (beg_interval);
+ p = beg_interval;
+ beg_interval = NULL;
+
+ /* normal_char and normal_backslash need `c'. */
+ PATFETCH (c);
+
+ if (!(syntax & RE_NO_BK_BRACES))
+ {
+ if (p > pattern && p[-1] == '\\')
+ goto normal_backslash;
+ }
+ goto normal_char;
+
+#ifdef emacs
+ /* There is no way to specify the before_dot and after_dot
+ operators. rms says this is ok. --karl */
+ case '=':
+ BUF_PUSH (at_dot);
+ break;
+
+ case 's':
+ laststart = b;
+ PATFETCH (c);
+ BUF_PUSH_2 (syntaxspec, syntax_spec_code[c]);
+ break;
+
+ case 'S':
+ laststart = b;
+ PATFETCH (c);
+ BUF_PUSH_2 (notsyntaxspec, syntax_spec_code[c]);
+ break;
+#endif /* emacs */
+
+
+ case 'w':
+ if (re_syntax_options & RE_NO_GNU_OPS)
+ goto normal_char;
+ laststart = b;
+ BUF_PUSH (wordchar);
+ break;
+
+
+ case 'W':
+ if (re_syntax_options & RE_NO_GNU_OPS)
+ goto normal_char;
+ laststart = b;
+ BUF_PUSH (notwordchar);
+ break;
+
+
+ case '<':
+ if (re_syntax_options & RE_NO_GNU_OPS)
+ goto normal_char;
+ BUF_PUSH (wordbeg);
+ break;
+
+ case '>':
+ if (re_syntax_options & RE_NO_GNU_OPS)
+ goto normal_char;
+ BUF_PUSH (wordend);
+ break;
+
+ case 'b':
+ if (re_syntax_options & RE_NO_GNU_OPS)
+ goto normal_char;
+ BUF_PUSH (wordbound);
+ break;
+
+ case 'B':
+ if (re_syntax_options & RE_NO_GNU_OPS)
+ goto normal_char;
+ BUF_PUSH (notwordbound);
+ break;
+
+ case '`':
+ if (re_syntax_options & RE_NO_GNU_OPS)
+ goto normal_char;
+ BUF_PUSH (begbuf);
+ break;
+
+ case '\'':
+ if (re_syntax_options & RE_NO_GNU_OPS)
+ goto normal_char;
+ BUF_PUSH (endbuf);
+ break;
+
+ case '1': case '2': case '3': case '4': case '5':
+ case '6': case '7': case '8': case '9':
+ if (syntax & RE_NO_BK_REFS)
+ goto normal_char;
+
+ c1 = c - '0';
+
+ if (c1 > regnum)
+ FREE_STACK_RETURN (REG_ESUBREG);
+
+ /* Can't back reference to a subexpression if inside of it. */
+ if (group_in_compile_stack (compile_stack, (regnum_t) c1))
+ goto normal_char;
+
+ laststart = b;
+ BUF_PUSH_2 (duplicate, c1);
+ break;
+
+
+ case '+':
+ case '?':
+ if (syntax & RE_BK_PLUS_QM)
+ goto handle_plus;
+ else
+ goto normal_backslash;
+
+ default:
+ normal_backslash:
+ /* You might think it would be useful for \ to mean
+ not to translate; but if we don't translate it
+ it will never match anything. */
+ c = TRANSLATE (c);
+ goto normal_char;
+ }
+ break;
+
+
+ default:
+ /* Expects the character in `c'. */
+ normal_char:
+ /* If no exactn currently being built. */
+ if (!pending_exact
+
+ /* If last exactn not at current position. */
+ || pending_exact + *pending_exact + 1 != b
+
+ /* We have only one byte following the exactn for the count. */
+ || *pending_exact == (1 << BYTEWIDTH) - 1
+
+ /* If followed by a repetition operator. */
+ || *p == '*' || *p == '^'
+ || ((syntax & RE_BK_PLUS_QM)
+ ? *p == '\\' && (p[1] == '+' || p[1] == '?')
+ : (*p == '+' || *p == '?'))
+ || ((syntax & RE_INTERVALS)
+ && ((syntax & RE_NO_BK_BRACES)
+ ? *p == '{'
+ : (p[0] == '\\' && p[1] == '{'))))
+ {
+ /* Start building a new exactn. */
+
+ laststart = b;
+
+ BUF_PUSH_2 (exactn, 0);
+ pending_exact = b - 1;
+ }
+
+ BUF_PUSH (c);
+ (*pending_exact)++;
+ break;
+ } /* switch (c) */
+ } /* while p != pend */
+
+
+ /* Through the pattern now. */
+
+ if (fixup_alt_jump)
+ STORE_JUMP (jump_past_alt, fixup_alt_jump, b);
+
+ if (!COMPILE_STACK_EMPTY)
+ FREE_STACK_RETURN (REG_EPAREN);
+
+ /* If we don't want backtracking, force success
+ the first time we reach the end of the compiled pattern. */
+ if (syntax & RE_NO_POSIX_BACKTRACKING)
+ BUF_PUSH (succeed);
+
+ free (compile_stack.stack);
+
+ /* We have succeeded; set the length of the buffer. */
+ bufp->used = b - bufp->buffer;
+
+#ifdef DEBUG
+ if (debug)
+ {
+ DEBUG_PRINT1 ("\nCompiled pattern: \n");
+ print_compiled_pattern (bufp);
+ }
+#endif /* DEBUG */
+
+#ifndef MATCH_MAY_ALLOCATE
+ /* Initialize the failure stack to the largest possible stack. This
+ isn't necessary unless we're trying to avoid calling alloca in
+ the search and match routines. */
+ {
+ int num_regs = bufp->re_nsub + 1;
+
+ /* Since DOUBLE_FAIL_STACK refuses to double only if the current size
+ is strictly greater than re_max_failures, the largest possible stack
+ is 2 * re_max_failures failure points. */
+ if (fail_stack.size < (2 * re_max_failures * MAX_FAILURE_ITEMS))
+ {
+ fail_stack.size = (2 * re_max_failures * MAX_FAILURE_ITEMS);
+
+#ifdef emacs
+ if (! fail_stack.stack)
+ fail_stack.stack
+ = (fail_stack_elt_t *) xmalloc (fail_stack.size
+ * sizeof (fail_stack_elt_t));
+ else
+ fail_stack.stack
+ = (fail_stack_elt_t *) xrealloc (fail_stack.stack,
+ (fail_stack.size
+ * sizeof (fail_stack_elt_t)));
+#else /* not emacs */
+ if (! fail_stack.stack)
+ fail_stack.stack
+ = (fail_stack_elt_t *) malloc (fail_stack.size
+ * sizeof (fail_stack_elt_t));
+ else
+ fail_stack.stack
+ = (fail_stack_elt_t *) realloc (fail_stack.stack,
+ (fail_stack.size
+ * sizeof (fail_stack_elt_t)));
+#endif /* not emacs */
+ }
+
+ regex_grow_registers (num_regs);
+ }
+#endif /* not MATCH_MAY_ALLOCATE */
+
+ return REG_NOERROR;
+} /* regex_compile */
+
+/* Subroutines for `regex_compile'. */
+
+/* Store OP at LOC followed by two-byte integer parameter ARG. */
+
+static void
+store_op1 (op, loc, arg)
+ re_opcode_t op;
+ unsigned char *loc;
+ int arg;
+{
+ *loc = (unsigned char) op;
+ STORE_NUMBER (loc + 1, arg);
+}
+
+
+/* Like `store_op1', but for two two-byte parameters ARG1 and ARG2. */
+
+static void
+store_op2 (op, loc, arg1, arg2)
+ re_opcode_t op;
+ unsigned char *loc;
+ int arg1, arg2;
+{
+ *loc = (unsigned char) op;
+ STORE_NUMBER (loc + 1, arg1);
+ STORE_NUMBER (loc + 3, arg2);
+}
+
+
+/* Copy the bytes from LOC to END to open up three bytes of space at LOC
+ for OP followed by two-byte integer parameter ARG. */
+
+static void
+insert_op1 (op, loc, arg, end)
+ re_opcode_t op;
+ unsigned char *loc;
+ int arg;
+ unsigned char *end;
+{
+ register unsigned char *pfrom = end;
+ register unsigned char *pto = end + 3;
+
+ while (pfrom != loc)
+ *--pto = *--pfrom;
+
+ store_op1 (op, loc, arg);
+}
+
+
+/* Like `insert_op1', but for two two-byte parameters ARG1 and ARG2. */
+
+static void
+insert_op2 (op, loc, arg1, arg2, end)
+ re_opcode_t op;
+ unsigned char *loc;
+ int arg1, arg2;
+ unsigned char *end;
+{
+ register unsigned char *pfrom = end;
+ register unsigned char *pto = end + 5;
+
+ while (pfrom != loc)
+ *--pto = *--pfrom;
+
+ store_op2 (op, loc, arg1, arg2);
+}
+
+
+/* P points to just after a ^ in PATTERN. Return true if that ^ comes
+ after an alternative or a begin-subexpression. We assume there is at
+ least one character before the ^. */
+
+static boolean
+at_begline_loc_p (pattern, p, syntax)
+ const char *pattern, *p;
+ reg_syntax_t syntax;
+{
+ const char *prev = p - 2;
+ boolean prev_prev_backslash = prev > pattern && prev[-1] == '\\';
+
+ return
+ /* After a subexpression? */
+ (*prev == '(' && (syntax & RE_NO_BK_PARENS || prev_prev_backslash))
+ /* After an alternative? */
+ || (*prev == '|' && (syntax & RE_NO_BK_VBAR || prev_prev_backslash));
+}
+
+
+/* The dual of at_begline_loc_p. This one is for $. We assume there is
+ at least one character after the $, i.e., `P < PEND'. */
+
+static boolean
+at_endline_loc_p (p, pend, syntax)
+ const char *p, *pend;
+ reg_syntax_t syntax;
+{
+ const char *next = p;
+ boolean next_backslash = *next == '\\';
+ const char *next_next = p + 1 < pend ? p + 1 : 0;
+
+ return
+ /* Before a subexpression? */
+ (syntax & RE_NO_BK_PARENS ? *next == ')'
+ : next_backslash && next_next && *next_next == ')')
+ /* Before an alternative? */
+ || (syntax & RE_NO_BK_VBAR ? *next == '|'
+ : next_backslash && next_next && *next_next == '|');
+}
+
+
+/* Returns true if REGNUM is in one of COMPILE_STACK's elements and
+ false if it's not. */
+
+static boolean
+group_in_compile_stack (compile_stack, regnum)
+ compile_stack_type compile_stack;
+ regnum_t regnum;
+{
+ int this_element;
+
+ for (this_element = compile_stack.avail - 1;
+ this_element >= 0;
+ this_element--)
+ if (compile_stack.stack[this_element].regnum == regnum)
+ return true;
+
+ return false;
+}
+
+
+/* Read the ending character of a range (in a bracket expression) from the
+ uncompiled pattern *P_PTR (which ends at PEND). We assume the
+ starting character is in `P[-2]'. (`P[-1]' is the character `-'.)
+ Then we set the translation of all bits between the starting and
+ ending characters (inclusive) in the compiled pattern B.
+
+ Return an error code.
+
+ We use these short variable names so we can use the same macros as
+ `regex_compile' itself. */
+
+static reg_errcode_t
+compile_range (p_ptr, pend, translate, syntax, b)
+ const char **p_ptr, *pend;
+ RE_TRANSLATE_TYPE translate;
+ reg_syntax_t syntax;
+ unsigned char *b;
+{
+ unsigned this_char;
+
+ const char *p = *p_ptr;
+ unsigned int range_start, range_end;
+
+ if (p == pend)
+ return REG_ERANGE;
+
+ /* Even though the pattern is a signed `char *', we need to fetch
+ with unsigned char *'s; if the high bit of the pattern character
+ is set, the range endpoints will be negative if we fetch using a
+ signed char *.
+
+ We also want to fetch the endpoints without translating them; the
+ appropriate translation is done in the bit-setting loop below. */
+ /* The SVR4 compiler on the 3B2 had trouble with unsigned const char *. */
+ range_start = ((const unsigned char *) p)[-2];
+ range_end = ((const unsigned char *) p)[0];
+
+ /* Have to increment the pointer into the pattern string, so the
+ caller isn't still at the ending character. */
+ (*p_ptr)++;
+
+ /* If the start is after the end, the range is empty. */
+ if (range_start > range_end)
+ return syntax & RE_NO_EMPTY_RANGES ? REG_ERANGE : REG_NOERROR;
+
+ /* Here we see why `this_char' has to be larger than an `unsigned
+ char' -- the range is inclusive, so if `range_end' == 0xff
+ (assuming 8-bit characters), we would otherwise go into an infinite
+ loop, since all characters <= 0xff. */
+ for (this_char = range_start; this_char <= range_end; this_char++)
+ {
+ SET_LIST_BIT (TRANSLATE (this_char));
+ }
+
+ return REG_NOERROR;
+}
+
+/* re_compile_fastmap computes a ``fastmap'' for the compiled pattern in
+ BUFP. A fastmap records which of the (1 << BYTEWIDTH) possible
+ characters can start a string that matches the pattern. This fastmap
+ is used by re_search to skip quickly over impossible starting points.
+
+ The caller must supply the address of a (1 << BYTEWIDTH)-byte data
+ area as BUFP->fastmap.
+
+ We set the `fastmap', `fastmap_accurate', and `can_be_null' fields in
+ the pattern buffer.
+
+ Returns 0 if we succeed, -2 if an internal error. */
+
+int
+re_compile_fastmap (bufp)
+ struct re_pattern_buffer *bufp;
+{
+ int j, k;
+#ifdef MATCH_MAY_ALLOCATE
+ fail_stack_type fail_stack;
+#endif
+#ifndef REGEX_MALLOC
+ char *destination;
+#endif
+ /* We don't push any register information onto the failure stack. */
+//sword unsigned num_regs = 0;
+
+ register char *fastmap = bufp->fastmap;
+ unsigned char *pattern = bufp->buffer;
+ unsigned char *p = pattern;
+ register unsigned char *pend = pattern + bufp->used;
+
+#ifdef REL_ALLOC
+ /* This holds the pointer to the failure stack, when
+ it is allocated relocatably. */
+ fail_stack_elt_t *failure_stack_ptr;
+#endif
+
+ /* Assume that each path through the pattern can be null until
+ proven otherwise. We set this false at the bottom of switch
+ statement, to which we get only if a particular path doesn't
+ match the empty string. */
+ boolean path_can_be_null = true;
+
+ /* We aren't doing a `succeed_n' to begin with. */
+ boolean succeed_n_p = false;
+
+ assert (fastmap != NULL && p != NULL);
+
+ INIT_FAIL_STACK ();
+ bzero (fastmap, 1 << BYTEWIDTH); /* Assume nothing's valid. */
+ bufp->fastmap_accurate = 1; /* It will be when we're done. */
+ bufp->can_be_null = 0;
+
+ while (1)
+ {
+ if (p == pend || *p == succeed)
+ {
+ /* We have reached the (effective) end of pattern. */
+ if (!FAIL_STACK_EMPTY ())
+ {
+ bufp->can_be_null |= path_can_be_null;
+
+ /* Reset for next path. */
+ path_can_be_null = true;
+
+ p = fail_stack.stack[--fail_stack.avail].pointer;
+
+ continue;
+ }
+ else
+ break;
+ }
+
+ /* We should never be about to go beyond the end of the pattern. */
+ assert (p < pend);
+
+ switch (SWITCH_ENUM_CAST ((re_opcode_t) *p++))
+ {
+
+ /* I guess the idea here is to simply not bother with a fastmap
+ if a backreference is used, since it's too hard to figure out
+ the fastmap for the corresponding group. Setting
+ `can_be_null' stops `re_search_2' from using the fastmap, so
+ that is all we do. */
+ case duplicate:
+ bufp->can_be_null = 1;
+ goto done;
+
+
+ /* Following are the cases which match a character. These end
+ with `break'. */
+
+ case exactn:
+ fastmap[p[1]] = 1;
+ break;
+
+
+ case charset:
+ for (j = *p++ * BYTEWIDTH - 1; j >= 0; j--)
+ if (p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH)))
+ fastmap[j] = 1;
+ break;
+
+
+ case charset_not:
+ /* Chars beyond end of map must be allowed. */
+ for (j = *p * BYTEWIDTH; j < (1 << BYTEWIDTH); j++)
+ fastmap[j] = 1;
+
+ for (j = *p++ * BYTEWIDTH - 1; j >= 0; j--)
+ if (!(p[j / BYTEWIDTH] & (1 << (j % BYTEWIDTH))))
+ fastmap[j] = 1;
+ break;
+
+
+ case wordchar:
+ for (j = 0; j < (1 << BYTEWIDTH); j++)
+ if (SYNTAX (j) == Sword)
+ fastmap[j] = 1;
+ break;
+
+
+ case notwordchar:
+ for (j = 0; j < (1 << BYTEWIDTH); j++)
+ if (SYNTAX (j) != Sword)
+ fastmap[j] = 1;
+ break;
+
+
+ case anychar:
+ {
+ int fastmap_newline = fastmap['\n'];
+
+ /* `.' matches anything ... */
+ for (j = 0; j < (1 << BYTEWIDTH); j++)
+ fastmap[j] = 1;
+
+ /* ... except perhaps newline. */
+ if (!(bufp->syntax & RE_DOT_NEWLINE))
+ fastmap['\n'] = fastmap_newline;
+
+ /* Return if we have already set `can_be_null'; if we have,
+ then the fastmap is irrelevant. Something's wrong here. */
+ else if (bufp->can_be_null)
+ goto done;
+
+ /* Otherwise, have to check alternative paths. */
+ break;
+ }
+
+#ifdef emacs
+ case syntaxspec:
+ k = *p++;
+ for (j = 0; j < (1 << BYTEWIDTH); j++)
+ if (SYNTAX (j) == (enum syntaxcode) k)
+ fastmap[j] = 1;
+ break;
+
+
+ case notsyntaxspec:
+ k = *p++;
+ for (j = 0; j < (1 << BYTEWIDTH); j++)
+ if (SYNTAX (j) != (enum syntaxcode) k)
+ fastmap[j] = 1;
+ break;
+
+
+ /* All cases after this match the empty string. These end with
+ `continue'. */
+
+
+ case before_dot:
+ case at_dot:
+ case after_dot:
+ continue;
+#endif /* emacs */
+
+
+ case no_op:
+ case begline:
+ case endline:
+ case begbuf:
+ case endbuf:
+ case wordbound:
+ case notwordbound:
+ case wordbeg:
+ case wordend:
+ case push_dummy_failure:
+ continue;
+
+
+ case jump_n:
+ case pop_failure_jump:
+ case maybe_pop_jump:
+ case jump:
+ case jump_past_alt:
+ case dummy_failure_jump:
+ EXTRACT_NUMBER_AND_INCR (j, p);
+ p += j;
+ if (j > 0)
+ continue;
+
+ /* Jump backward implies we just went through the body of a
+ loop and matched nothing. Opcode jumped to should be
+ `on_failure_jump' or `succeed_n'. Just treat it like an
+ ordinary jump. For a * loop, it has pushed its failure
+ point already; if so, discard that as redundant. */
+ if ((re_opcode_t) *p != on_failure_jump
+ && (re_opcode_t) *p != succeed_n)
+ continue;
+
+ p++;
+ EXTRACT_NUMBER_AND_INCR (j, p);
+ p += j;
+
+ /* If what's on the stack is where we are now, pop it. */
+ if (!FAIL_STACK_EMPTY ()
+ && fail_stack.stack[fail_stack.avail - 1].pointer == p)
+ fail_stack.avail--;
+
+ continue;
+
+
+ case on_failure_jump:
+ case on_failure_keep_string_jump:
+ handle_on_failure_jump:
+ EXTRACT_NUMBER_AND_INCR (j, p);
+
+ /* For some patterns, e.g., `(a?)?', `p+j' here points to the
+ end of the pattern. We don't want to push such a point,
+ since when we restore it above, entering the switch will
+ increment `p' past the end of the pattern. We don't need
+ to push such a point since we obviously won't find any more
+ fastmap entries beyond `pend'. Such a pattern can match
+ the null string, though. */
+ if (p + j < pend)
+ {
+ if (!PUSH_PATTERN_OP (p + j, fail_stack))
+ {
+ RESET_FAIL_STACK ();
+ return -2;
+ }
+ }
+ else
+ bufp->can_be_null = 1;
+
+ if (succeed_n_p)
+ {
+ EXTRACT_NUMBER_AND_INCR (k, p); /* Skip the n. */
+ succeed_n_p = false;
+ }
+
+ continue;
+
+
+ case succeed_n:
+ /* Get to the number of times to succeed. */
+ p += 2;
+
+ /* Increment p past the n for when k != 0. */
+ EXTRACT_NUMBER_AND_INCR (k, p);
+ if (k == 0)
+ {
+ p -= 4;
+ succeed_n_p = true; /* Spaghetti code alert. */
+ goto handle_on_failure_jump;
+ }
+ continue;
+
+
+ case set_number_at:
+ p += 4;
+ continue;
+
+
+ case start_memory:
+ case stop_memory:
+ p += 2;
+ continue;
+
+
+ default:
+ abort (); /* We have listed all the cases. */
+ } /* switch *p++ */
+
+ /* Getting here means we have found the possible starting
+ characters for one path of the pattern -- and that the empty
+ string does not match. We need not follow this path further.
+ Instead, look at the next alternative (remembered on the
+ stack), or quit if no more. The test at the top of the loop
+ does these things. */
+ path_can_be_null = false;
+ p = pend;
+ } /* while p */
+
+ /* Set `can_be_null' for the last path (also the first path, if the
+ pattern is empty). */
+ bufp->can_be_null |= path_can_be_null;
+
+ done:
+ RESET_FAIL_STACK ();
+ return 0;
+} /* re_compile_fastmap */
+
+/* Set REGS to hold NUM_REGS registers, storing them in STARTS and
+ ENDS. Subsequent matches using PATTERN_BUFFER and REGS will use
+ this memory for recording register information. STARTS and ENDS
+ must be allocated using the malloc library routine, and must each
+ be at least NUM_REGS * sizeof (regoff_t) bytes long.
+
+ If NUM_REGS == 0, then subsequent matches should allocate their own
+ register data.
+
+ Unless this function is called, the first search or match using
+ PATTERN_BUFFER will allocate its own register data, without
+ freeing the old data. */
+
+void
+re_set_registers (bufp, regs, num_regs, starts, ends)
+ struct re_pattern_buffer *bufp;
+ struct re_registers *regs;
+ unsigned num_regs;
+ regoff_t *starts, *ends;
+{
+ if (num_regs)
+ {
+ bufp->regs_allocated = REGS_REALLOCATE;
+ regs->num_regs = num_regs;
+ regs->start = starts;
+ regs->end = ends;
+ }
+ else
+ {
+ bufp->regs_allocated = REGS_UNALLOCATED;
+ regs->num_regs = 0;
+ regs->start = regs->end = (regoff_t *) 0;
+ }
+}
+
+/* Searching routines. */
+
+/* Like re_search_2, below, but only one string is specified, and
+ doesn't let you say where to stop matching. */
+
+int
+re_search (bufp, string, size, startpos, range, regs)
+ struct re_pattern_buffer *bufp;
+ const char *string;
+ int size, startpos, range;
+ struct re_registers *regs;
+{
+ return re_search_2 (bufp, NULL, 0, string, size, startpos, range,
+ regs, size);
+}
+
+
+/* Using the compiled pattern in BUFP->buffer, first tries to match the
+ virtual concatenation of STRING1 and STRING2, starting first at index
+ STARTPOS, then at STARTPOS + 1, and so on.
+
+ STRING1 and STRING2 have length SIZE1 and SIZE2, respectively.
+
+ RANGE is how far to scan while trying to match. RANGE = 0 means try
+ only at STARTPOS; in general, the last start tried is STARTPOS +
+ RANGE.
+
+ In REGS, return the indices of the virtual concatenation of STRING1
+ and STRING2 that matched the entire BUFP->buffer and its contained
+ subexpressions.
+
+ Do not consider matching one past the index STOP in the virtual
+ concatenation of STRING1 and STRING2.
+
+ We return either the position in the strings at which the match was
+ found, -1 if no match, or -2 if error (such as failure
+ stack overflow). */
+
+int
+re_search_2 (bufp, string1, size1, string2, size2, startpos, range, regs, stop)
+ struct re_pattern_buffer *bufp;
+ const char *string1, *string2;
+ int size1, size2;
+ int startpos;
+ int range;
+ struct re_registers *regs;
+ int stop;
+{
+ int val;
+ register char *fastmap = bufp->fastmap;
+ register RE_TRANSLATE_TYPE translate = bufp->translate;
+ int total_size = size1 + size2;
+ int endpos = startpos + range;
+
+ /* Check for out-of-range STARTPOS. */
+ if (startpos < 0 || startpos > total_size)
+ return -1;
+
+ /* Fix up RANGE if it might eventually take us outside
+ the virtual concatenation of STRING1 and STRING2.
+ Make sure we won't move STARTPOS below 0 or above TOTAL_SIZE. */
+ if (endpos < 0)
+ range = 0 - startpos;
+ else if (endpos > total_size)
+ range = total_size - startpos;
+
+ /* If the search isn't to be a backwards one, don't waste time in a
+ search for a pattern that must be anchored. */
+ if (bufp->used > 0 && (re_opcode_t) bufp->buffer[0] == begbuf && range > 0)
+ {
+ if (startpos > 0)
+ return -1;
+ else
+ range = 1;
+ }
+
+#ifdef emacs
+ /* In a forward search for something that starts with \=.
+ don't keep searching past point. */
+ if (bufp->used > 0 && (re_opcode_t) bufp->buffer[0] == at_dot && range > 0)
+ {
+ range = PT - startpos;
+ if (range <= 0)
+ return -1;
+ }
+#endif /* emacs */
+
+ /* Update the fastmap now if not correct already. */
+ if (fastmap && !bufp->fastmap_accurate)
+ if (re_compile_fastmap (bufp) == -2)
+ return -2;
+
+ /* Loop through the string, looking for a place to start matching. */
+ for (;;)
+ {
+ /* If a fastmap is supplied, skip quickly over characters that
+ cannot be the start of a match. If the pattern can match the
+ null string, however, we don't need to skip characters; we want
+ the first null string. */
+ if (fastmap && startpos < total_size && !bufp->can_be_null)
+ {
+ if (range > 0) /* Searching forwards. */
+ {
+ register const char *d;
+ register int lim = 0;
+ int irange = range;
+
+ if (startpos < size1 && startpos + range >= size1)
+ lim = range - (size1 - startpos);
+
+ d = (startpos >= size1 ? string2 - size1 : string1) + startpos;
+
+ /* Written out as an if-else to avoid testing `translate'
+ inside the loop. */
+ if (translate)
+ while (range > lim
+ && !fastmap[(unsigned char)
+ translate[(unsigned char) *d++]])
+ range--;
+ else
+ while (range > lim && !fastmap[(unsigned char) *d++])
+ range--;
+
+ startpos += irange - range;
+ }
+ else /* Searching backwards. */
+ {
+ register char c = (size1 == 0 || startpos >= size1
+ ? string2[startpos - size1]
+ : string1[startpos]);
+
+ if (!fastmap[(unsigned char) TRANSLATE (c)])
+ goto advance;
+ }
+ }
+
+ /* If can't match the null string, and that's all we have left, fail. */
+ if (range >= 0 && startpos == total_size && fastmap
+ && !bufp->can_be_null)
+ return -1;
+
+ val = re_match_2_internal (bufp, string1, size1, string2, size2,
+ startpos, regs, stop);
+#ifndef REGEX_MALLOC
+#ifdef C_ALLOCA
+ alloca (0);
+#endif
+#endif
+
+ if (val >= 0)
+ return startpos;
+
+ if (val == -2)
+ return -2;
+
+ advance:
+ if (!range)
+ break;
+ else if (range > 0)
+ {
+ range--;
+ startpos++;
+ }
+ else
+ {
+ range++;
+ startpos--;
+ }
+ }
+ return -1;
+} /* re_search_2 */
+
+/* This converts PTR, a pointer into one of the search strings `string1'
+ and `string2' into an offset from the beginning of that string. */
+#define POINTER_TO_OFFSET(ptr) \
+ (FIRST_STRING_P (ptr) \
+ ? ((regoff_t) ((ptr) - string1)) \
+ : ((regoff_t) ((ptr) - string2 + size1)))
+
+/* Macros for dealing with the split strings in re_match_2. */
+
+#define MATCHING_IN_FIRST_STRING (dend == end_match_1)
+
+/* Call before fetching a character with *d. This switches over to
+ string2 if necessary. */
+#define PREFETCH() \
+ while (d == dend) \
+ { \
+ /* End of string2 => fail. */ \
+ if (dend == end_match_2) \
+ goto fail; \
+ /* End of string1 => advance to string2. */ \
+ d = string2; \
+ dend = end_match_2; \
+ }
+
+
+/* Test if at very beginning or at very end of the virtual concatenation
+ of `string1' and `string2'. If only one string, it's `string2'. */
+#define AT_STRINGS_BEG(d) ((d) == (size1 ? string1 : string2) || !size2)
+#define AT_STRINGS_END(d) ((d) == end2)
+
+
+/* Test if D points to a character which is word-constituent. We have
+ two special cases to check for: if past the end of string1, look at
+ the first character in string2; and if before the beginning of
+ string2, look at the last character in string1. */
+#define WORDCHAR_P(d) \
+ (SYNTAX ((d) == end1 ? *string2 \
+ : (d) == string2 - 1 ? *(end1 - 1) : *(d)) \
+ == Sword)
+
+/* Disabled due to a compiler bug -- see comment at case wordbound */
+#if 0
+/* Test if the character before D and the one at D differ with respect
+ to being word-constituent. */
+#define AT_WORD_BOUNDARY(d) \
+ (AT_STRINGS_BEG (d) || AT_STRINGS_END (d) \
+ || WORDCHAR_P (d - 1) != WORDCHAR_P (d))
+#endif
+
+/* Free everything we malloc. */
+#ifdef MATCH_MAY_ALLOCATE
+#define FREE_VAR(var) if (var) REGEX_FREE (var); var = NULL
+#define FREE_VARIABLES() \
+ do { \
+ REGEX_FREE_STACK (fail_stack.stack); \
+ FREE_VAR (regstart); \
+ FREE_VAR (regend); \
+ FREE_VAR (old_regstart); \
+ FREE_VAR (old_regend); \
+ FREE_VAR (best_regstart); \
+ FREE_VAR (best_regend); \
+ FREE_VAR (reg_info); \
+ FREE_VAR (reg_dummy); \
+ FREE_VAR (reg_info_dummy); \
+ } while (0)
+#else
+#define FREE_VARIABLES() ((void)0) /* Do nothing! But inhibit gcc warning. */
+#endif /* not MATCH_MAY_ALLOCATE */
+
+/* These values must meet several constraints. They must not be valid
+ register values; since we have a limit of 255 registers (because
+ we use only one byte in the pattern for the register number), we can
+ use numbers larger than 255. They must differ by 1, because of
+ NUM_FAILURE_ITEMS above. And the value for the lowest register must
+ be larger than the value for the highest register, so we do not try
+ to actually save any registers when none are active. */
+#define NO_HIGHEST_ACTIVE_REG (1 << BYTEWIDTH)
+#define NO_LOWEST_ACTIVE_REG (NO_HIGHEST_ACTIVE_REG + 1)
+
+/* Matching routines. */
+
+#ifndef emacs /* Emacs never uses this. */
+/* re_match is like re_match_2 except it takes only a single string. */
+
+int
+re_match (bufp, string, size, pos, regs)
+ struct re_pattern_buffer *bufp;
+ const char *string;
+ int size, pos;
+ struct re_registers *regs;
+{
+ int result = re_match_2_internal (bufp, NULL, 0, string, size,
+ pos, regs, size);
+#ifndef REGEX_MALLOC
+#ifdef C_ALLOCA
+ alloca (0);
+#endif
+#endif
+ return result;
+}
+#endif /* not emacs */
+
+static boolean group_match_null_string_p _RE_ARGS ((unsigned char **p,
+ unsigned char *end,
+ register_info_type *reg_info));
+static boolean alt_match_null_string_p _RE_ARGS ((unsigned char *p,
+ unsigned char *end,
+ register_info_type *reg_info));
+static boolean common_op_match_null_string_p _RE_ARGS ((unsigned char **p,
+ unsigned char *end,
+ register_info_type *reg_info));
+static int bcmp_translate _RE_ARGS ((const char *s1, const char *s2,
+ int len, char *translate));
+
+/* re_match_2 matches the compiled pattern in BUFP against the
+ the (virtual) concatenation of STRING1 and STRING2 (of length SIZE1
+ and SIZE2, respectively). We start matching at POS, and stop
+ matching at STOP.
+
+ If REGS is non-null and the `no_sub' field of BUFP is nonzero, we
+ store offsets for the substring each group matched in REGS. See the
+ documentation for exactly how many groups we fill.
+
+ We return -1 if no match, -2 if an internal error (such as the
+ failure stack overflowing). Otherwise, we return the length of the
+ matched substring. */
+
+int
+re_match_2 (bufp, string1, size1, string2, size2, pos, regs, stop)
+ struct re_pattern_buffer *bufp;
+ const char *string1, *string2;
+ int size1, size2;
+ int pos;
+ struct re_registers *regs;
+ int stop;
+{
+ int result = re_match_2_internal (bufp, string1, size1, string2, size2,
+ pos, regs, stop);
+#ifndef REGEX_MALLOC
+#ifdef C_ALLOCA
+ alloca (0);
+#endif
+#endif
+ return result;
+}
+
+/* This is a separate function so that we can force an alloca cleanup
+ afterwards. */
+static int
+re_match_2_internal (bufp, string1, size1, string2, size2, pos, regs, stop)
+ struct re_pattern_buffer *bufp;
+ const char *string1, *string2;
+ int size1, size2;
+ int pos;
+ struct re_registers *regs;
+ int stop;
+{
+ /* General temporaries. */
+ int mcnt;
+ unsigned char *p1;
+
+ /* Just past the end of the corresponding string. */
+ const char *end1, *end2;
+
+ /* Pointers into string1 and string2, just past the last characters in
+ each to consider matching. */
+ const char *end_match_1, *end_match_2;
+
+ /* Where we are in the data, and the end of the current string. */
+ const char *d, *dend;
+
+ /* Where we are in the pattern, and the end of the pattern. */
+ unsigned char *p = bufp->buffer;
+ register unsigned char *pend = p + bufp->used;
+
+ /* Mark the opcode just after a start_memory, so we can test for an
+ empty subpattern when we get to the stop_memory. */
+ unsigned char *just_past_start_mem = 0;
+
+ /* We use this to map every character in the string. */
+ RE_TRANSLATE_TYPE translate = bufp->translate;
+
+ /* Failure point stack. Each place that can handle a failure further
+ down the line pushes a failure point on this stack. It consists of
+ restart, regend, and reg_info for all registers corresponding to
+ the subexpressions we're currently inside, plus the number of such
+ registers, and, finally, two char *'s. The first char * is where
+ to resume scanning the pattern; the second one is where to resume
+ scanning the strings. If the latter is zero, the failure point is
+ a ``dummy''; if a failure happens and the failure point is a dummy,
+ it gets discarded and the next next one is tried. */
+#ifdef MATCH_MAY_ALLOCATE /* otherwise, this is global. */
+ fail_stack_type fail_stack;
+#endif
+#ifdef DEBUG
+ static unsigned failure_id = 0;
+ unsigned nfailure_points_pushed = 0, nfailure_points_popped = 0;
+#endif
+
+#ifdef REL_ALLOC
+ /* This holds the pointer to the failure stack, when
+ it is allocated relocatably. */
+ fail_stack_elt_t *failure_stack_ptr;
+#endif
+
+ /* We fill all the registers internally, independent of what we
+ return, for use in backreferences. The number here includes
+ an element for register zero. */
+ size_t num_regs = bufp->re_nsub + 1;
+
+ /* The currently active registers. */
+ active_reg_t lowest_active_reg = NO_LOWEST_ACTIVE_REG;
+ active_reg_t highest_active_reg = NO_HIGHEST_ACTIVE_REG;
+
+ /* Information on the contents of registers. These are pointers into
+ the input strings; they record just what was matched (on this
+ attempt) by a subexpression part of the pattern, that is, the
+ regnum-th regstart pointer points to where in the pattern we began
+ matching and the regnum-th regend points to right after where we
+ stopped matching the regnum-th subexpression. (The zeroth register
+ keeps track of what the whole pattern matches.) */
+#ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global. */
+ const char **regstart, **regend;
+#endif
+
+ /* If a group that's operated upon by a repetition operator fails to
+ match anything, then the register for its start will need to be
+ restored because it will have been set to wherever in the string we
+ are when we last see its open-group operator. Similarly for a
+ register's end. */
+#ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global. */
+ const char **old_regstart, **old_regend;
+#endif
+
+ /* The is_active field of reg_info helps us keep track of which (possibly
+ nested) subexpressions we are currently in. The matched_something
+ field of reg_info[reg_num] helps us tell whether or not we have
+ matched any of the pattern so far this time through the reg_num-th
+ subexpression. These two fields get reset each time through any
+ loop their register is in. */
+#ifdef MATCH_MAY_ALLOCATE /* otherwise, this is global. */
+ register_info_type *reg_info;
+#endif
+
+ /* The following record the register info as found in the above
+ variables when we find a match better than any we've seen before.
+ This happens as we backtrack through the failure points, which in
+ turn happens only if we have not yet matched the entire string. */
+ unsigned best_regs_set = false;
+#ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global. */
+ const char **best_regstart, **best_regend;
+#endif
+
+ /* Logically, this is `best_regend[0]'. But we don't want to have to
+ allocate space for that if we're not allocating space for anything
+ else (see below). Also, we never need info about register 0 for
+ any of the other register vectors, and it seems rather a kludge to
+ treat `best_regend' differently than the rest. So we keep track of
+ the end of the best match so far in a separate variable. We
+ initialize this to NULL so that when we backtrack the first time
+ and need to test it, it's not garbage. */
+ const char *match_end = NULL;
+
+ /* This helps SET_REGS_MATCHED avoid doing redundant work. */
+ int set_regs_matched_done = 0;
+
+ /* Used when we pop values we don't care about. */
+#ifdef MATCH_MAY_ALLOCATE /* otherwise, these are global. */
+ const char **reg_dummy;
+ register_info_type *reg_info_dummy;
+#endif
+
+#ifdef DEBUG
+ /* Counts the total number of registers pushed. */
+ unsigned num_regs_pushed = 0;
+#endif
+
+ DEBUG_PRINT1 ("\n\nEntering re_match_2.\n");
+
+ INIT_FAIL_STACK ();
+
+#ifdef MATCH_MAY_ALLOCATE
+ /* Do not bother to initialize all the register variables if there are
+ no groups in the pattern, as it takes a fair amount of time. If
+ there are groups, we include space for register 0 (the whole
+ pattern), even though we never use it, since it simplifies the
+ array indexing. We should fix this. */
+ if (bufp->re_nsub)
+ {
+ regstart = REGEX_TALLOC (num_regs, const char *);
+ regend = REGEX_TALLOC (num_regs, const char *);
+ old_regstart = REGEX_TALLOC (num_regs, const char *);
+ old_regend = REGEX_TALLOC (num_regs, const char *);
+ best_regstart = REGEX_TALLOC (num_regs, const char *);
+ best_regend = REGEX_TALLOC (num_regs, const char *);
+ reg_info = REGEX_TALLOC (num_regs, register_info_type);
+ reg_dummy = REGEX_TALLOC (num_regs, const char *);
+ reg_info_dummy = REGEX_TALLOC (num_regs, register_info_type);
+
+ if (!(regstart && regend && old_regstart && old_regend && reg_info
+ && best_regstart && best_regend && reg_dummy && reg_info_dummy))
+ {
+ FREE_VARIABLES ();
+ return -2;
+ }
+ }
+ else
+ {
+ /* We must initialize all our variables to NULL, so that
+ `FREE_VARIABLES' doesn't try to free them. */
+ regstart = regend = old_regstart = old_regend = best_regstart
+ = best_regend = reg_dummy = NULL;
+ reg_info = reg_info_dummy = (register_info_type *) NULL;
+ }
+#endif /* MATCH_MAY_ALLOCATE */
+
+ /* The starting position is bogus. */
+ if (pos < 0 || pos > size1 + size2)
+ {
+ FREE_VARIABLES ();
+ return -1;
+ }
+
+ /* Initialize subexpression text positions to -1 to mark ones that no
+ start_memory/stop_memory has been seen for. Also initialize the
+ register information struct. */
+ for (mcnt = 1; (unsigned) mcnt < num_regs; mcnt++)
+ {
+ regstart[mcnt] = regend[mcnt]
+ = old_regstart[mcnt] = old_regend[mcnt] = REG_UNSET_VALUE;
+
+ REG_MATCH_NULL_STRING_P (reg_info[mcnt]) = MATCH_NULL_UNSET_VALUE;
+ IS_ACTIVE (reg_info[mcnt]) = 0;
+ MATCHED_SOMETHING (reg_info[mcnt]) = 0;
+ EVER_MATCHED_SOMETHING (reg_info[mcnt]) = 0;
+ }
+
+ /* We move `string1' into `string2' if the latter's empty -- but not if
+ `string1' is null. */
+ if (size2 == 0 && string1 != NULL)
+ {
+ string2 = string1;
+ size2 = size1;
+ string1 = 0;
+ size1 = 0;
+ }
+ end1 = string1 + size1;
+ end2 = string2 + size2;
+
+ /* Compute where to stop matching, within the two strings. */
+ if (stop <= size1)
+ {
+ end_match_1 = string1 + stop;
+ end_match_2 = string2;
+ }
+ else
+ {
+ end_match_1 = end1;
+ end_match_2 = string2 + stop - size1;
+ }
+
+ /* `p' scans through the pattern as `d' scans through the data.
+ `dend' is the end of the input string that `d' points within. `d'
+ is advanced into the following input string whenever necessary, but
+ this happens before fetching; therefore, at the beginning of the
+ loop, `d' can be pointing at the end of a string, but it cannot
+ equal `string2'. */
+ if (size1 > 0 && pos <= size1)
+ {
+ d = string1 + pos;
+ dend = end_match_1;
+ }
+ else
+ {
+ d = string2 + pos - size1;
+ dend = end_match_2;
+ }
+
+ DEBUG_PRINT1 ("The compiled pattern is:\n");
+ DEBUG_PRINT_COMPILED_PATTERN (bufp, p, pend);
+ DEBUG_PRINT1 ("The string to match is: `");
+ DEBUG_PRINT_DOUBLE_STRING (d, string1, size1, string2, size2);
+ DEBUG_PRINT1 ("'\n");
+
+ /* This loops over pattern commands. It exits by returning from the
+ function if the match is complete, or it drops through if the match
+ fails at this starting point in the input data. */
+ for (;;)
+ {
+#ifdef _LIBC
+ DEBUG_PRINT2 ("\n%p: ", p);
+#else
+ DEBUG_PRINT2 ("\n0x%x: ", p);
+#endif
+
+ if (p == pend)
+ { /* End of pattern means we might have succeeded. */
+ DEBUG_PRINT1 ("end of pattern ... ");
+
+ /* If we haven't matched the entire string, and we want the
+ longest match, try backtracking. */
+ if (d != end_match_2)
+ {
+ /* 1 if this match ends in the same string (string1 or string2)
+ as the best previous match. */
+ boolean same_str_p = (FIRST_STRING_P (match_end)
+ == MATCHING_IN_FIRST_STRING);
+ /* 1 if this match is the best seen so far. */
+ boolean best_match_p;
+
+ /* AIX compiler got confused when this was combined
+ with the previous declaration. */
+ if (same_str_p)
+ best_match_p = d > match_end;
+ else
+ best_match_p = !MATCHING_IN_FIRST_STRING;
+
+ DEBUG_PRINT1 ("backtracking.\n");
+
+ if (!FAIL_STACK_EMPTY ())
+ { /* More failure points to try. */
+
+ /* If exceeds best match so far, save it. */
+ if (!best_regs_set || best_match_p)
+ {
+ best_regs_set = true;
+ match_end = d;
+
+ DEBUG_PRINT1 ("\nSAVING match as best so far.\n");
+
+ for (mcnt = 1; (unsigned) mcnt < num_regs; mcnt++)
+ {
+ best_regstart[mcnt] = regstart[mcnt];
+ best_regend[mcnt] = regend[mcnt];
+ }
+ }
+ goto fail;
+ }
+
+ /* If no failure points, don't restore garbage. And if
+ last match is real best match, don't restore second
+ best one. */
+ else if (best_regs_set && !best_match_p)
+ {
+ restore_best_regs:
+ /* Restore best match. It may happen that `dend ==
+ end_match_1' while the restored d is in string2.
+ For example, the pattern `x.*y.*z' against the
+ strings `x-' and `y-z-', if the two strings are
+ not consecutive in memory. */
+ DEBUG_PRINT1 ("Restoring best registers.\n");
+
+ d = match_end;
+ dend = ((d >= string1 && d <= end1)
+ ? end_match_1 : end_match_2);
+
+ for (mcnt = 1; (unsigned) mcnt < num_regs; mcnt++)
+ {
+ regstart[mcnt] = best_regstart[mcnt];
+ regend[mcnt] = best_regend[mcnt];
+ }
+ }
+ } /* d != end_match_2 */
+
+ succeed_label:
+ DEBUG_PRINT1 ("Accepting match.\n");
+
+ /* If caller wants register contents data back, do it. */
+ if (regs && !bufp->no_sub)
+ {
+ /* Have the register data arrays been allocated? */
+ if (bufp->regs_allocated == REGS_UNALLOCATED)
+ { /* No. So allocate them with malloc. We need one
+ extra element beyond `num_regs' for the `-1' marker
+ GNU code uses. */
+ regs->num_regs = MAX (RE_NREGS, num_regs + 1);
+ regs->start = TALLOC (regs->num_regs, regoff_t);
+ regs->end = TALLOC (regs->num_regs, regoff_t);
+ if (regs->start == NULL || regs->end == NULL)
+ {
+ FREE_VARIABLES ();
+ return -2;
+ }
+ bufp->regs_allocated = REGS_REALLOCATE;
+ }
+ else if (bufp->regs_allocated == REGS_REALLOCATE)
+ { /* Yes. If we need more elements than were already
+ allocated, reallocate them. If we need fewer, just
+ leave it alone. */
+ if (regs->num_regs < num_regs + 1)
+ {
+ regs->num_regs = num_regs + 1;
+ RETALLOC (regs->start, regs->num_regs, regoff_t);
+ RETALLOC (regs->end, regs->num_regs, regoff_t);
+ if (regs->start == NULL || regs->end == NULL)
+ {
+ FREE_VARIABLES ();
+ return -2;
+ }
+ }
+ }
+ else
+ {
+ /* These braces fend off a "empty body in an else-statement"
+ warning under GCC when assert expands to nothing. */
+ assert (bufp->regs_allocated == REGS_FIXED);
+ }
+
+ /* Convert the pointer data in `regstart' and `regend' to
+ indices. Register zero has to be set differently,
+ since we haven't kept track of any info for it. */
+ if (regs->num_regs > 0)
+ {
+ regs->start[0] = pos;
+ regs->end[0] = (MATCHING_IN_FIRST_STRING
+ ? ((regoff_t) (d - string1))
+ : ((regoff_t) (d - string2 + size1)));
+ }
+
+ /* Go through the first `min (num_regs, regs->num_regs)'
+ registers, since that is all we initialized. */
+ for (mcnt = 1; (unsigned) mcnt < MIN (num_regs, regs->num_regs);
+ mcnt++)
+ {
+ if (REG_UNSET (regstart[mcnt]) || REG_UNSET (regend[mcnt]))
+ regs->start[mcnt] = regs->end[mcnt] = -1;
+ else
+ {
+ regs->start[mcnt]
+ = (regoff_t) POINTER_TO_OFFSET (regstart[mcnt]);
+ regs->end[mcnt]
+ = (regoff_t) POINTER_TO_OFFSET (regend[mcnt]);
+ }
+ }
+
+ /* If the regs structure we return has more elements than
+ were in the pattern, set the extra elements to -1. If
+ we (re)allocated the registers, this is the case,
+ because we always allocate enough to have at least one
+ -1 at the end. */
+ for (mcnt = num_regs; (unsigned) mcnt < regs->num_regs; mcnt++)
+ regs->start[mcnt] = regs->end[mcnt] = -1;
+ } /* regs && !bufp->no_sub */
+
+ DEBUG_PRINT4 ("%u failure points pushed, %u popped (%u remain).\n",
+ nfailure_points_pushed, nfailure_points_popped,
+ nfailure_points_pushed - nfailure_points_popped);
+ DEBUG_PRINT2 ("%u registers pushed.\n", num_regs_pushed);
+
+ mcnt = d - pos - (MATCHING_IN_FIRST_STRING
+ ? string1
+ : string2 - size1);
+
+ DEBUG_PRINT2 ("Returning %d from re_match_2.\n", mcnt);
+
+ FREE_VARIABLES ();
+ return mcnt;
+ }
+
+ /* Otherwise match next pattern command. */
+ switch (SWITCH_ENUM_CAST ((re_opcode_t) *p++))
+ {
+ /* Ignore these. Used to ignore the n of succeed_n's which
+ currently have n == 0. */
+ case no_op:
+ DEBUG_PRINT1 ("EXECUTING no_op.\n");
+ break;
+
+ case succeed:
+ DEBUG_PRINT1 ("EXECUTING succeed.\n");
+ goto succeed_label;
+
+ /* Match the next n pattern characters exactly. The following
+ byte in the pattern defines n, and the n bytes after that
+ are the characters to match. */
+ case exactn:
+ mcnt = *p++;
+ DEBUG_PRINT2 ("EXECUTING exactn %d.\n", mcnt);
+
+ /* This is written out as an if-else so we don't waste time
+ testing `translate' inside the loop. */
+ if (translate)
+ {
+ do
+ {
+ PREFETCH ();
+ if ((unsigned char) translate[(unsigned char) *d++]
+ != (unsigned char) *p++)
+ goto fail;
+ }
+ while (--mcnt);
+ }
+ else
+ {
+ do
+ {
+ PREFETCH ();
+ if (*d++ != (char) *p++) goto fail;
+ }
+ while (--mcnt);
+ }
+ SET_REGS_MATCHED ();
+ break;
+
+
+ /* Match any character except possibly a newline or a null. */
+ case anychar:
+ DEBUG_PRINT1 ("EXECUTING anychar.\n");
+
+ PREFETCH ();
+
+ if ((!(bufp->syntax & RE_DOT_NEWLINE) && TRANSLATE (*d) == '\n')
+ || (bufp->syntax & RE_DOT_NOT_NULL && TRANSLATE (*d) == '\000'))
+ goto fail;
+
+ SET_REGS_MATCHED ();
+ DEBUG_PRINT2 (" Matched `%d'.\n", *d);
+ d++;
+ break;
+
+
+ case charset:
+ case charset_not:
+ {
+ register unsigned char c;
+ boolean not = (re_opcode_t) *(p - 1) == charset_not;
+
+ DEBUG_PRINT2 ("EXECUTING charset%s.\n", not ? "_not" : "");
+
+ PREFETCH ();
+ c = TRANSLATE (*d); /* The character to match. */
+
+ /* Cast to `unsigned' instead of `unsigned char' in case the
+ bit list is a full 32 bytes long. */
+ if (c < (unsigned) (*p * BYTEWIDTH)
+ && p[1 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH)))
+ not = !not;
+
+ p += 1 + *p;
+
+ if (!not) goto fail;
+
+ SET_REGS_MATCHED ();
+ d++;
+ break;
+ }
+
+
+ /* The beginning of a group is represented by start_memory.
+ The arguments are the register number in the next byte, and the
+ number of groups inner to this one in the next. The text
+ matched within the group is recorded (in the internal
+ registers data structure) under the register number. */
+ case start_memory:
+ DEBUG_PRINT3 ("EXECUTING start_memory %d (%d):\n", *p, p[1]);
+
+ /* Find out if this group can match the empty string. */
+ p1 = p; /* To send to group_match_null_string_p. */
+
+ if (REG_MATCH_NULL_STRING_P (reg_info[*p]) == MATCH_NULL_UNSET_VALUE)
+ REG_MATCH_NULL_STRING_P (reg_info[*p])
+ = group_match_null_string_p (&p1, pend, reg_info);
+
+ /* Save the position in the string where we were the last time
+ we were at this open-group operator in case the group is
+ operated upon by a repetition operator, e.g., with `(a*)*b'
+ against `ab'; then we want to ignore where we are now in
+ the string in case this attempt to match fails. */
+ old_regstart[*p] = REG_MATCH_NULL_STRING_P (reg_info[*p])
+ ? REG_UNSET (regstart[*p]) ? d : regstart[*p]
+ : regstart[*p];
+ DEBUG_PRINT2 (" old_regstart: %d\n",
+ POINTER_TO_OFFSET (old_regstart[*p]));
+
+ regstart[*p] = d;
+ DEBUG_PRINT2 (" regstart: %d\n", POINTER_TO_OFFSET (regstart[*p]));
+
+ IS_ACTIVE (reg_info[*p]) = 1;
+ MATCHED_SOMETHING (reg_info[*p]) = 0;
+
+ /* Clear this whenever we change the register activity status. */
+ set_regs_matched_done = 0;
+
+ /* This is the new highest active register. */
+ highest_active_reg = *p;
+
+ /* If nothing was active before, this is the new lowest active
+ register. */
+ if (lowest_active_reg == NO_LOWEST_ACTIVE_REG)
+ lowest_active_reg = *p;
+
+ /* Move past the register number and inner group count. */
+ p += 2;
+ just_past_start_mem = p;
+
+ break;
+
+
+ /* The stop_memory opcode represents the end of a group. Its
+ arguments are the same as start_memory's: the register
+ number, and the number of inner groups. */
+ case stop_memory:
+ DEBUG_PRINT3 ("EXECUTING stop_memory %d (%d):\n", *p, p[1]);
+
+ /* We need to save the string position the last time we were at
+ this close-group operator in case the group is operated
+ upon by a repetition operator, e.g., with `((a*)*(b*)*)*'
+ against `aba'; then we want to ignore where we are now in
+ the string in case this attempt to match fails. */
+ old_regend[*p] = REG_MATCH_NULL_STRING_P (reg_info[*p])
+ ? REG_UNSET (regend[*p]) ? d : regend[*p]
+ : regend[*p];
+ DEBUG_PRINT2 (" old_regend: %d\n",
+ POINTER_TO_OFFSET (old_regend[*p]));
+
+ regend[*p] = d;
+ DEBUG_PRINT2 (" regend: %d\n", POINTER_TO_OFFSET (regend[*p]));
+
+ /* This register isn't active anymore. */
+ IS_ACTIVE (reg_info[*p]) = 0;
+
+ /* Clear this whenever we change the register activity status. */
+ set_regs_matched_done = 0;
+
+ /* If this was the only register active, nothing is active
+ anymore. */
+ if (lowest_active_reg == highest_active_reg)
+ {
+ lowest_active_reg = NO_LOWEST_ACTIVE_REG;
+ highest_active_reg = NO_HIGHEST_ACTIVE_REG;
+ }
+ else
+ { /* We must scan for the new highest active register, since
+ it isn't necessarily one less than now: consider
+ (a(b)c(d(e)f)g). When group 3 ends, after the f), the
+ new highest active register is 1. */
+ unsigned char r = *p - 1;
+ while (r > 0 && !IS_ACTIVE (reg_info[r]))
+ r--;
+
+ /* If we end up at register zero, that means that we saved
+ the registers as the result of an `on_failure_jump', not
+ a `start_memory', and we jumped to past the innermost
+ `stop_memory'. For example, in ((.)*) we save
+ registers 1 and 2 as a result of the *, but when we pop
+ back to the second ), we are at the stop_memory 1.
+ Thus, nothing is active. */
+ if (r == 0)
+ {
+ lowest_active_reg = NO_LOWEST_ACTIVE_REG;
+ highest_active_reg = NO_HIGHEST_ACTIVE_REG;
+ }
+ else
+ highest_active_reg = r;
+ }
+
+ /* If just failed to match something this time around with a
+ group that's operated on by a repetition operator, try to
+ force exit from the ``loop'', and restore the register
+ information for this group that we had before trying this
+ last match. */
+ if ((!MATCHED_SOMETHING (reg_info[*p])
+ || just_past_start_mem == p - 1)
+ && (p + 2) < pend)
+ {
+ boolean is_a_jump_n = false;
+
+ p1 = p + 2;
+ mcnt = 0;
+ switch ((re_opcode_t) *p1++)
+ {
+ case jump_n:
+ is_a_jump_n = true;
+ case pop_failure_jump:
+ case maybe_pop_jump:
+ case jump:
+ case dummy_failure_jump:
+ EXTRACT_NUMBER_AND_INCR (mcnt, p1);
+ if (is_a_jump_n)
+ p1 += 2;
+ break;
+
+ default:
+ /* do nothing */ ;
+ }
+ p1 += mcnt;
+
+ /* If the next operation is a jump backwards in the pattern
+ to an on_failure_jump right before the start_memory
+ corresponding to this stop_memory, exit from the loop
+ by forcing a failure after pushing on the stack the
+ on_failure_jump's jump in the pattern, and d. */
+ if (mcnt < 0 && (re_opcode_t) *p1 == on_failure_jump
+ && (re_opcode_t) p1[3] == start_memory && p1[4] == *p)
+ {
+ /* If this group ever matched anything, then restore
+ what its registers were before trying this last
+ failed match, e.g., with `(a*)*b' against `ab' for
+ regstart[1], and, e.g., with `((a*)*(b*)*)*'
+ against `aba' for regend[3].
+
+ Also restore the registers for inner groups for,
+ e.g., `((a*)(b*))*' against `aba' (register 3 would
+ otherwise get trashed). */
+
+ if (EVER_MATCHED_SOMETHING (reg_info[*p]))
+ {
+ unsigned r;
+
+ EVER_MATCHED_SOMETHING (reg_info[*p]) = 0;
+
+ /* Restore this and inner groups' (if any) registers. */
+ for (r = *p; r < (unsigned) *p + (unsigned) *(p + 1);
+ r++)
+ {
+ regstart[r] = old_regstart[r];
+
+ /* xx why this test? */
+ if (old_regend[r] >= regstart[r])
+ regend[r] = old_regend[r];
+ }
+ }
+ p1++;
+ EXTRACT_NUMBER_AND_INCR (mcnt, p1);
+ PUSH_FAILURE_POINT (p1 + mcnt, d, -2);
+
+ goto fail;
+ }
+ }
+
+ /* Move past the register number and the inner group count. */
+ p += 2;
+ break;
+
+
+ /* \<digit> has been turned into a `duplicate' command which is
+ followed by the numeric value of <digit> as the register number. */
+ case duplicate:
+ {
+ register const char *d2, *dend2;
+ int regno = *p++; /* Get which register to match against. */
+ DEBUG_PRINT2 ("EXECUTING duplicate %d.\n", regno);
+
+ /* Can't back reference a group which we've never matched. */
+ if (REG_UNSET (regstart[regno]) || REG_UNSET (regend[regno]))
+ goto fail;
+
+ /* Where in input to try to start matching. */
+ d2 = regstart[regno];
+
+ /* Where to stop matching; if both the place to start and
+ the place to stop matching are in the same string, then
+ set to the place to stop, otherwise, for now have to use
+ the end of the first string. */
+
+ dend2 = ((FIRST_STRING_P (regstart[regno])
+ == FIRST_STRING_P (regend[regno]))
+ ? regend[regno] : end_match_1);
+ for (;;)
+ {
+ /* If necessary, advance to next segment in register
+ contents. */
+ while (d2 == dend2)
+ {
+ if (dend2 == end_match_2) break;
+ if (dend2 == regend[regno]) break;
+
+ /* End of string1 => advance to string2. */
+ d2 = string2;
+ dend2 = regend[regno];
+ }
+ /* At end of register contents => success */
+ if (d2 == dend2) break;
+
+ /* If necessary, advance to next segment in data. */
+ PREFETCH ();
+
+ /* How many characters left in this segment to match. */
+ mcnt = dend - d;
+
+ /* Want how many consecutive characters we can match in
+ one shot, so, if necessary, adjust the count. */
+ if (mcnt > dend2 - d2)
+ mcnt = dend2 - d2;
+
+ /* Compare that many; failure if mismatch, else move
+ past them. */
+ if (translate
+ ? bcmp_translate (d, d2, mcnt, translate)
+ : bcmp (d, d2, mcnt))
+ goto fail;
+ d += mcnt, d2 += mcnt;
+
+ /* Do this because we've match some characters. */
+ SET_REGS_MATCHED ();
+ }
+ }
+ break;
+
+
+ /* begline matches the empty string at the beginning of the string
+ (unless `not_bol' is set in `bufp'), and, if
+ `newline_anchor' is set, after newlines. */
+ case begline:
+ DEBUG_PRINT1 ("EXECUTING begline.\n");
+
+ if (AT_STRINGS_BEG (d))
+ {
+ if (!bufp->not_bol) break;
+ }
+ else if (d[-1] == '\n' && bufp->newline_anchor)
+ {
+ break;
+ }
+ /* In all other cases, we fail. */
+ goto fail;
+
+
+ /* endline is the dual of begline. */
+ case endline:
+ DEBUG_PRINT1 ("EXECUTING endline.\n");
+
+ if (AT_STRINGS_END (d))
+ {
+ if (!bufp->not_eol) break;
+ }
+
+ /* We have to ``prefetch'' the next character. */
+ else if ((d == end1 ? *string2 : *d) == '\n'
+ && bufp->newline_anchor)
+ {
+ break;
+ }
+ goto fail;
+
+
+ /* Match at the very beginning of the data. */
+ case begbuf:
+ DEBUG_PRINT1 ("EXECUTING begbuf.\n");
+ if (AT_STRINGS_BEG (d))
+ break;
+ goto fail;
+
+
+ /* Match at the very end of the data. */
+ case endbuf:
+ DEBUG_PRINT1 ("EXECUTING endbuf.\n");
+ if (AT_STRINGS_END (d))
+ break;
+ goto fail;
+
+
+ /* on_failure_keep_string_jump is used to optimize `.*\n'. It
+ pushes NULL as the value for the string on the stack. Then
+ `pop_failure_point' will keep the current value for the
+ string, instead of restoring it. To see why, consider
+ matching `foo\nbar' against `.*\n'. The .* matches the foo;
+ then the . fails against the \n. But the next thing we want
+ to do is match the \n against the \n; if we restored the
+ string value, we would be back at the foo.
+
+ Because this is used only in specific cases, we don't need to
+ check all the things that `on_failure_jump' does, to make
+ sure the right things get saved on the stack. Hence we don't
+ share its code. The only reason to push anything on the
+ stack at all is that otherwise we would have to change
+ `anychar's code to do something besides goto fail in this
+ case; that seems worse than this. */
+ case on_failure_keep_string_jump:
+ DEBUG_PRINT1 ("EXECUTING on_failure_keep_string_jump");
+
+ EXTRACT_NUMBER_AND_INCR (mcnt, p);
+#ifdef _LIBC
+ DEBUG_PRINT3 (" %d (to %p):\n", mcnt, p + mcnt);
+#else
+ DEBUG_PRINT3 (" %d (to 0x%x):\n", mcnt, p + mcnt);
+#endif
+
+ PUSH_FAILURE_POINT (p + mcnt, NULL, -2);
+ break;
+
+
+ /* Uses of on_failure_jump:
+
+ Each alternative starts with an on_failure_jump that points
+ to the beginning of the next alternative. Each alternative
+ except the last ends with a jump that in effect jumps past
+ the rest of the alternatives. (They really jump to the
+ ending jump of the following alternative, because tensioning
+ these jumps is a hassle.)
+
+ Repeats start with an on_failure_jump that points past both
+ the repetition text and either the following jump or
+ pop_failure_jump back to this on_failure_jump. */
+ case on_failure_jump:
+ on_failure:
+ DEBUG_PRINT1 ("EXECUTING on_failure_jump");
+
+ EXTRACT_NUMBER_AND_INCR (mcnt, p);
+#ifdef _LIBC
+ DEBUG_PRINT3 (" %d (to %p)", mcnt, p + mcnt);
+#else
+ DEBUG_PRINT3 (" %d (to 0x%x)", mcnt, p + mcnt);
+#endif
+
+ /* If this on_failure_jump comes right before a group (i.e.,
+ the original * applied to a group), save the information
+ for that group and all inner ones, so that if we fail back
+ to this point, the group's information will be correct.
+ For example, in \(a*\)*\1, we need the preceding group,
+ and in \(zz\(a*\)b*\)\2, we need the inner group. */
+
+ /* We can't use `p' to check ahead because we push
+ a failure point to `p + mcnt' after we do this. */
+ p1 = p;
+
+ /* We need to skip no_op's before we look for the
+ start_memory in case this on_failure_jump is happening as
+ the result of a completed succeed_n, as in \(a\)\{1,3\}b\1
+ against aba. */
+ while (p1 < pend && (re_opcode_t) *p1 == no_op)
+ p1++;
+
+ if (p1 < pend && (re_opcode_t) *p1 == start_memory)
+ {
+ /* We have a new highest active register now. This will
+ get reset at the start_memory we are about to get to,
+ but we will have saved all the registers relevant to
+ this repetition op, as described above. */
+ highest_active_reg = *(p1 + 1) + *(p1 + 2);
+ if (lowest_active_reg == NO_LOWEST_ACTIVE_REG)
+ lowest_active_reg = *(p1 + 1);
+ }
+
+ DEBUG_PRINT1 (":\n");
+ PUSH_FAILURE_POINT (p + mcnt, d, -2);
+ break;
+
+
+ /* A smart repeat ends with `maybe_pop_jump'.
+ We change it to either `pop_failure_jump' or `jump'. */
+ case maybe_pop_jump:
+ EXTRACT_NUMBER_AND_INCR (mcnt, p);
+ DEBUG_PRINT2 ("EXECUTING maybe_pop_jump %d.\n", mcnt);
+ {
+ register unsigned char *p2 = p;
+
+ /* Compare the beginning of the repeat with what in the
+ pattern follows its end. If we can establish that there
+ is nothing that they would both match, i.e., that we
+ would have to backtrack because of (as in, e.g., `a*a')
+ then we can change to pop_failure_jump, because we'll
+ never have to backtrack.
+
+ This is not true in the case of alternatives: in
+ `(a|ab)*' we do need to backtrack to the `ab' alternative
+ (e.g., if the string was `ab'). But instead of trying to
+ detect that here, the alternative has put on a dummy
+ failure point which is what we will end up popping. */
+
+ /* Skip over open/close-group commands.
+ If what follows this loop is a ...+ construct,
+ look at what begins its body, since we will have to
+ match at least one of that. */
+ while (1)
+ {
+ if (p2 + 2 < pend
+ && ((re_opcode_t) *p2 == stop_memory
+ || (re_opcode_t) *p2 == start_memory))
+ p2 += 3;
+ else if (p2 + 6 < pend
+ && (re_opcode_t) *p2 == dummy_failure_jump)
+ p2 += 6;
+ else
+ break;
+ }
+
+ p1 = p + mcnt;
+ /* p1[0] ... p1[2] are the `on_failure_jump' corresponding
+ to the `maybe_finalize_jump' of this case. Examine what
+ follows. */
+
+ /* If we're at the end of the pattern, we can change. */
+ if (p2 == pend)
+ {
+ /* Consider what happens when matching ":\(.*\)"
+ against ":/". I don't really understand this code
+ yet. */
+ p[-3] = (unsigned char) pop_failure_jump;
+ DEBUG_PRINT1
+ (" End of pattern: change to `pop_failure_jump'.\n");
+ }
+
+ else if ((re_opcode_t) *p2 == exactn
+ || (bufp->newline_anchor && (re_opcode_t) *p2 == endline))
+ {
+ register unsigned char c
+ = *p2 == (unsigned char) endline ? '\n' : p2[2];
+
+ if ((re_opcode_t) p1[3] == exactn && p1[5] != c)
+ {
+ p[-3] = (unsigned char) pop_failure_jump;
+ DEBUG_PRINT3 (" %c != %c => pop_failure_jump.\n",
+ c, p1[5]);
+ }
+
+ else if ((re_opcode_t) p1[3] == charset
+ || (re_opcode_t) p1[3] == charset_not)
+ {
+ int not = (re_opcode_t) p1[3] == charset_not;
+
+ if (c < (unsigned char) (p1[4] * BYTEWIDTH)
+ && p1[5 + c / BYTEWIDTH] & (1 << (c % BYTEWIDTH)))
+ not = !not;
+
+ /* `not' is equal to 1 if c would match, which means
+ that we can't change to pop_failure_jump. */
+ if (!not)
+ {
+ p[-3] = (unsigned char) pop_failure_jump;
+ DEBUG_PRINT1 (" No match => pop_failure_jump.\n");
+ }
+ }
+ }
+ else if ((re_opcode_t) *p2 == charset)
+ {
+#ifdef DEBUG
+ register unsigned char c
+ = *p2 == (unsigned char) endline ? '\n' : p2[2];
+#endif
+
+#if 0
+ if ((re_opcode_t) p1[3] == exactn
+ && ! ((int) p2[1] * BYTEWIDTH > (int) p1[5]
+ && (p2[2 + p1[5] / BYTEWIDTH]
+ & (1 << (p1[5] % BYTEWIDTH)))))
+#else
+ if ((re_opcode_t) p1[3] == exactn
+ && ! ((int) p2[1] * BYTEWIDTH > (int) p1[4]
+ && (p2[2 + p1[4] / BYTEWIDTH]
+ & (1 << (p1[4] % BYTEWIDTH)))))
+#endif
+ {
+ p[-3] = (unsigned char) pop_failure_jump;
+ DEBUG_PRINT3 (" %c != %c => pop_failure_jump.\n",
+ c, p1[5]);
+ }
+
+ else if ((re_opcode_t) p1[3] == charset_not)
+ {
+ int idx;
+ /* We win if the charset_not inside the loop
+ lists every character listed in the charset after. */
+ for (idx = 0; idx < (int) p2[1]; idx++)
+ if (! (p2[2 + idx] == 0
+ || (idx < (int) p1[4]
+ && ((p2[2 + idx] & ~ p1[5 + idx]) == 0))))
+ break;
+
+ if (idx == p2[1])
+ {
+ p[-3] = (unsigned char) pop_failure_jump;
+ DEBUG_PRINT1 (" No match => pop_failure_jump.\n");
+ }
+ }
+ else if ((re_opcode_t) p1[3] == charset)
+ {
+ int idx;
+ /* We win if the charset inside the loop
+ has no overlap with the one after the loop. */
+ for (idx = 0;
+ idx < (int) p2[1] && idx < (int) p1[4];
+ idx++)
+ if ((p2[2 + idx] & p1[5 + idx]) != 0)
+ break;
+
+ if (idx == p2[1] || idx == p1[4])
+ {
+ p[-3] = (unsigned char) pop_failure_jump;
+ DEBUG_PRINT1 (" No match => pop_failure_jump.\n");
+ }
+ }
+ }
+ }
+ p -= 2; /* Point at relative address again. */
+ if ((re_opcode_t) p[-1] != pop_failure_jump)
+ {
+ p[-1] = (unsigned char) jump;
+ DEBUG_PRINT1 (" Match => jump.\n");
+ goto unconditional_jump;
+ }
+ /* Note fall through. */
+
+
+ /* The end of a simple repeat has a pop_failure_jump back to
+ its matching on_failure_jump, where the latter will push a
+ failure point. The pop_failure_jump takes off failure
+ points put on by this pop_failure_jump's matching
+ on_failure_jump; we got through the pattern to here from the
+ matching on_failure_jump, so didn't fail. */
+ case pop_failure_jump:
+ {
+ /* We need to pass separate storage for the lowest and
+ highest registers, even though we don't care about the
+ actual values. Otherwise, we will restore only one
+ register from the stack, since lowest will == highest in
+ `pop_failure_point'. */
+ active_reg_t dummy_low_reg, dummy_high_reg;
+ unsigned char *pdummy;
+ const char *sdummy;
+
+ DEBUG_PRINT1 ("EXECUTING pop_failure_jump.\n");
+ POP_FAILURE_POINT (sdummy, pdummy,
+ dummy_low_reg, dummy_high_reg,
+ reg_dummy, reg_dummy, reg_info_dummy);
+ }
+ /* Note fall through. */
+
+ unconditional_jump:
+#ifdef _LIBC
+ DEBUG_PRINT2 ("\n%p: ", p);
+#else
+ DEBUG_PRINT2 ("\n0x%x: ", p);
+#endif
+ /* Note fall through. */
+
+ /* Unconditionally jump (without popping any failure points). */
+ case jump:
+ EXTRACT_NUMBER_AND_INCR (mcnt, p); /* Get the amount to jump. */
+ DEBUG_PRINT2 ("EXECUTING jump %d ", mcnt);
+ p += mcnt; /* Do the jump. */
+#ifdef _LIBC
+ DEBUG_PRINT2 ("(to %p).\n", p);
+#else
+ DEBUG_PRINT2 ("(to 0x%x).\n", p);
+#endif
+ break;
+
+
+ /* We need this opcode so we can detect where alternatives end
+ in `group_match_null_string_p' et al. */
+ case jump_past_alt:
+ DEBUG_PRINT1 ("EXECUTING jump_past_alt.\n");
+ goto unconditional_jump;
+
+
+ /* Normally, the on_failure_jump pushes a failure point, which
+ then gets popped at pop_failure_jump. We will end up at
+ pop_failure_jump, also, and with a pattern of, say, `a+', we
+ are skipping over the on_failure_jump, so we have to push
+ something meaningless for pop_failure_jump to pop. */
+ case dummy_failure_jump:
+ DEBUG_PRINT1 ("EXECUTING dummy_failure_jump.\n");
+ /* It doesn't matter what we push for the string here. What
+ the code at `fail' tests is the value for the pattern. */
+ PUSH_FAILURE_POINT (0, 0, -2);
+ goto unconditional_jump;
+
+
+ /* At the end of an alternative, we need to push a dummy failure
+ point in case we are followed by a `pop_failure_jump', because
+ we don't want the failure point for the alternative to be
+ popped. For example, matching `(a|ab)*' against `aab'
+ requires that we match the `ab' alternative. */
+ case push_dummy_failure:
+ DEBUG_PRINT1 ("EXECUTING push_dummy_failure.\n");
+ /* See comments just above at `dummy_failure_jump' about the
+ two zeroes. */
+ PUSH_FAILURE_POINT (0, 0, -2);
+ break;
+
+ /* Have to succeed matching what follows at least n times.
+ After that, handle like `on_failure_jump'. */
+ case succeed_n:
+ EXTRACT_NUMBER (mcnt, p + 2);
+ DEBUG_PRINT2 ("EXECUTING succeed_n %d.\n", mcnt);
+
+ assert (mcnt >= 0);
+ /* Originally, this is how many times we HAVE to succeed. */
+ if (mcnt > 0)
+ {
+ mcnt--;
+ p += 2;
+ STORE_NUMBER_AND_INCR (p, mcnt);
+#ifdef _LIBC
+ DEBUG_PRINT3 (" Setting %p to %d.\n", p - 2, mcnt);
+#else
+ DEBUG_PRINT3 (" Setting 0x%x to %d.\n", p - 2, mcnt);
+#endif
+ }
+ else if (mcnt == 0)
+ {
+#ifdef _LIBC
+ DEBUG_PRINT2 (" Setting two bytes from %p to no_op.\n", p+2);
+#else
+ DEBUG_PRINT2 (" Setting two bytes from 0x%x to no_op.\n", p+2);
+#endif
+ p[2] = (unsigned char) no_op;
+ p[3] = (unsigned char) no_op;
+ goto on_failure;
+ }
+ break;
+
+ case jump_n:
+ EXTRACT_NUMBER (mcnt, p + 2);
+ DEBUG_PRINT2 ("EXECUTING jump_n %d.\n", mcnt);
+
+ /* Originally, this is how many times we CAN jump. */
+ if (mcnt)
+ {
+ mcnt--;
+ STORE_NUMBER (p + 2, mcnt);
+#ifdef _LIBC
+ DEBUG_PRINT3 (" Setting %p to %d.\n", p + 2, mcnt);
+#else
+ DEBUG_PRINT3 (" Setting 0x%x to %d.\n", p + 2, mcnt);
+#endif
+ goto unconditional_jump;
+ }
+ /* If don't have to jump any more, skip over the rest of command. */
+ else
+ p += 4;
+ break;
+
+ case set_number_at:
+ {
+ DEBUG_PRINT1 ("EXECUTING set_number_at.\n");
+
+ EXTRACT_NUMBER_AND_INCR (mcnt, p);
+ p1 = p + mcnt;
+ EXTRACT_NUMBER_AND_INCR (mcnt, p);
+#ifdef _LIBC
+ DEBUG_PRINT3 (" Setting %p to %d.\n", p1, mcnt);
+#else
+ DEBUG_PRINT3 (" Setting 0x%x to %d.\n", p1, mcnt);
+#endif
+ STORE_NUMBER (p1, mcnt);
+ break;
+ }
+
+#if 0
+ /* The DEC Alpha C compiler 3.x generates incorrect code for the
+ test WORDCHAR_P (d - 1) != WORDCHAR_P (d) in the expansion of
+ AT_WORD_BOUNDARY, so this code is disabled. Expanding the
+ macro and introducing temporary variables works around the bug. */
+
+ case wordbound:
+ DEBUG_PRINT1 ("EXECUTING wordbound.\n");
+ if (AT_WORD_BOUNDARY (d))
+ break;
+ goto fail;
+
+ case notwordbound:
+ DEBUG_PRINT1 ("EXECUTING notwordbound.\n");
+ if (AT_WORD_BOUNDARY (d))
+ goto fail;
+ break;
+#else
+ case wordbound:
+ {
+ boolean prevchar, thischar;
+
+ DEBUG_PRINT1 ("EXECUTING wordbound.\n");
+ if (AT_STRINGS_BEG (d) || AT_STRINGS_END (d))
+ break;
+
+ prevchar = WORDCHAR_P (d - 1);
+ thischar = WORDCHAR_P (d);
+ if (prevchar != thischar)
+ break;
+ goto fail;
+ }
+
+ case notwordbound:
+ {
+ boolean prevchar, thischar;
+
+ DEBUG_PRINT1 ("EXECUTING notwordbound.\n");
+ if (AT_STRINGS_BEG (d) || AT_STRINGS_END (d))
+ goto fail;
+
+ prevchar = WORDCHAR_P (d - 1);
+ thischar = WORDCHAR_P (d);
+ if (prevchar != thischar)
+ goto fail;
+ break;
+ }
+#endif
+
+ case wordbeg:
+ DEBUG_PRINT1 ("EXECUTING wordbeg.\n");
+ if (WORDCHAR_P (d) && (AT_STRINGS_BEG (d) || !WORDCHAR_P (d - 1)))
+ break;
+ goto fail;
+
+ case wordend:
+ DEBUG_PRINT1 ("EXECUTING wordend.\n");
+ if (!AT_STRINGS_BEG (d) && WORDCHAR_P (d - 1)
+ && (!WORDCHAR_P (d) || AT_STRINGS_END (d)))
+ break;
+ goto fail;
+
+#ifdef emacs
+ case before_dot:
+ DEBUG_PRINT1 ("EXECUTING before_dot.\n");
+ if (PTR_CHAR_POS ((unsigned char *) d) >= point)
+ goto fail;
+ break;
+
+ case at_dot:
+ DEBUG_PRINT1 ("EXECUTING at_dot.\n");
+ if (PTR_CHAR_POS ((unsigned char *) d) != point)
+ goto fail;
+ break;
+
+ case after_dot:
+ DEBUG_PRINT1 ("EXECUTING after_dot.\n");
+ if (PTR_CHAR_POS ((unsigned char *) d) <= point)
+ goto fail;
+ break;
+
+ case syntaxspec:
+ DEBUG_PRINT2 ("EXECUTING syntaxspec %d.\n", mcnt);
+ mcnt = *p++;
+ goto matchsyntax;
+
+ case wordchar:
+ DEBUG_PRINT1 ("EXECUTING Emacs wordchar.\n");
+ mcnt = (int) Sword;
+ matchsyntax:
+ PREFETCH ();
+ /* Can't use *d++ here; SYNTAX may be an unsafe macro. */
+ d++;
+ if (SYNTAX (d[-1]) != (enum syntaxcode) mcnt)
+ goto fail;
+ SET_REGS_MATCHED ();
+ break;
+
+ case notsyntaxspec:
+ DEBUG_PRINT2 ("EXECUTING notsyntaxspec %d.\n", mcnt);
+ mcnt = *p++;
+ goto matchnotsyntax;
+
+ case notwordchar:
+ DEBUG_PRINT1 ("EXECUTING Emacs notwordchar.\n");
+ mcnt = (int) Sword;
+ matchnotsyntax:
+ PREFETCH ();
+ /* Can't use *d++ here; SYNTAX may be an unsafe macro. */
+ d++;
+ if (SYNTAX (d[-1]) == (enum syntaxcode) mcnt)
+ goto fail;
+ SET_REGS_MATCHED ();
+ break;
+
+#else /* not emacs */
+ case wordchar:
+ DEBUG_PRINT1 ("EXECUTING non-Emacs wordchar.\n");
+ PREFETCH ();
+ if (!WORDCHAR_P (d))
+ goto fail;
+ SET_REGS_MATCHED ();
+ d++;
+ break;
+
+ case notwordchar:
+ DEBUG_PRINT1 ("EXECUTING non-Emacs notwordchar.\n");
+ PREFETCH ();
+ if (WORDCHAR_P (d))
+ goto fail;
+ SET_REGS_MATCHED ();
+ d++;
+ break;
+#endif /* not emacs */
+
+ default:
+ abort ();
+ }
+ continue; /* Successfully executed one pattern command; keep going. */
+
+
+ /* We goto here if a matching operation fails. */
+ fail:
+ if (!FAIL_STACK_EMPTY ())
+ { /* A restart point is known. Restore to that state. */
+ DEBUG_PRINT1 ("\nFAIL:\n");
+ POP_FAILURE_POINT (d, p,
+ lowest_active_reg, highest_active_reg,
+ regstart, regend, reg_info);
+
+ /* If this failure point is a dummy, try the next one. */
+ if (!p)
+ goto fail;
+
+ /* If we failed to the end of the pattern, don't examine *p. */
+ assert (p <= pend);
+ if (p < pend)
+ {
+ boolean is_a_jump_n = false;
+
+ /* If failed to a backwards jump that's part of a repetition
+ loop, need to pop this failure point and use the next one. */
+ switch ((re_opcode_t) *p)
+ {
+ case jump_n:
+ is_a_jump_n = true;
+ case maybe_pop_jump:
+ case pop_failure_jump:
+ case jump:
+ p1 = p + 1;
+ EXTRACT_NUMBER_AND_INCR (mcnt, p1);
+ p1 += mcnt;
+
+ if ((is_a_jump_n && (re_opcode_t) *p1 == succeed_n)
+ || (!is_a_jump_n
+ && (re_opcode_t) *p1 == on_failure_jump))
+ goto fail;
+ break;
+ default:
+ /* do nothing */ ;
+ }
+ }
+
+ if (d >= string1 && d <= end1)
+ dend = end_match_1;
+ }
+ else
+ break; /* Matching at this starting point really fails. */
+ } /* for (;;) */
+
+ if (best_regs_set)
+ goto restore_best_regs;
+
+ FREE_VARIABLES ();
+
+ return -1; /* Failure to match. */
+} /* re_match_2 */
+
+/* Subroutine definitions for re_match_2. */
+
+
+/* We are passed P pointing to a register number after a start_memory.
+
+ Return true if the pattern up to the corresponding stop_memory can
+ match the empty string, and false otherwise.
+
+ If we find the matching stop_memory, sets P to point to one past its number.
+ Otherwise, sets P to an undefined byte less than or equal to END.
+
+ We don't handle duplicates properly (yet). */
+
+static boolean
+group_match_null_string_p (p, end, reg_info)
+ unsigned char **p, *end;
+ register_info_type *reg_info;
+{
+ int mcnt;
+ /* Point to after the args to the start_memory. */
+ unsigned char *p1 = *p + 2;
+
+ while (p1 < end)
+ {
+ /* Skip over opcodes that can match nothing, and return true or
+ false, as appropriate, when we get to one that can't, or to the
+ matching stop_memory. */
+
+ switch ((re_opcode_t) *p1)
+ {
+ /* Could be either a loop or a series of alternatives. */
+ case on_failure_jump:
+ p1++;
+ EXTRACT_NUMBER_AND_INCR (mcnt, p1);
+
+ /* If the next operation is not a jump backwards in the
+ pattern. */
+
+ if (mcnt >= 0)
+ {
+ /* Go through the on_failure_jumps of the alternatives,
+ seeing if any of the alternatives cannot match nothing.
+ The last alternative starts with only a jump,
+ whereas the rest start with on_failure_jump and end
+ with a jump, e.g., here is the pattern for `a|b|c':
+
+ /on_failure_jump/0/6/exactn/1/a/jump_past_alt/0/6
+ /on_failure_jump/0/6/exactn/1/b/jump_past_alt/0/3
+ /exactn/1/c
+
+ So, we have to first go through the first (n-1)
+ alternatives and then deal with the last one separately. */
+
+
+ /* Deal with the first (n-1) alternatives, which start
+ with an on_failure_jump (see above) that jumps to right
+ past a jump_past_alt. */
+
+ while ((re_opcode_t) p1[mcnt-3] == jump_past_alt)
+ {
+ /* `mcnt' holds how many bytes long the alternative
+ is, including the ending `jump_past_alt' and
+ its number. */
+
+ if (!alt_match_null_string_p (p1, p1 + mcnt - 3,
+ reg_info))
+ return false;
+
+ /* Move to right after this alternative, including the
+ jump_past_alt. */
+ p1 += mcnt;
+
+ /* Break if it's the beginning of an n-th alternative
+ that doesn't begin with an on_failure_jump. */
+ if ((re_opcode_t) *p1 != on_failure_jump)
+ break;
+
+ /* Still have to check that it's not an n-th
+ alternative that starts with an on_failure_jump. */
+ p1++;
+ EXTRACT_NUMBER_AND_INCR (mcnt, p1);
+ if ((re_opcode_t) p1[mcnt-3] != jump_past_alt)
+ {
+ /* Get to the beginning of the n-th alternative. */
+ p1 -= 3;
+ break;
+ }
+ }
+
+ /* Deal with the last alternative: go back and get number
+ of the `jump_past_alt' just before it. `mcnt' contains
+ the length of the alternative. */
+ EXTRACT_NUMBER (mcnt, p1 - 2);
+
+ if (!alt_match_null_string_p (p1, p1 + mcnt, reg_info))
+ return false;
+
+ p1 += mcnt; /* Get past the n-th alternative. */
+ } /* if mcnt > 0 */
+ break;
+
+
+ case stop_memory:
+ assert (p1[1] == **p);
+ *p = p1 + 2;
+ return true;
+
+
+ default:
+ if (!common_op_match_null_string_p (&p1, end, reg_info))
+ return false;
+ }
+ } /* while p1 < end */
+
+ return false;
+} /* group_match_null_string_p */
+
+
+/* Similar to group_match_null_string_p, but doesn't deal with alternatives:
+ It expects P to be the first byte of a single alternative and END one
+ byte past the last. The alternative can contain groups. */
+
+static boolean
+alt_match_null_string_p (p, end, reg_info)
+ unsigned char *p, *end;
+ register_info_type *reg_info;
+{
+ int mcnt;
+ unsigned char *p1 = p;
+
+ while (p1 < end)
+ {
+ /* Skip over opcodes that can match nothing, and break when we get
+ to one that can't. */
+
+ switch ((re_opcode_t) *p1)
+ {
+ /* It's a loop. */
+ case on_failure_jump:
+ p1++;
+ EXTRACT_NUMBER_AND_INCR (mcnt, p1);
+ p1 += mcnt;
+ break;
+
+ default:
+ if (!common_op_match_null_string_p (&p1, end, reg_info))
+ return false;
+ }
+ } /* while p1 < end */
+
+ return true;
+} /* alt_match_null_string_p */
+
+
+/* Deals with the ops common to group_match_null_string_p and
+ alt_match_null_string_p.
+
+ Sets P to one after the op and its arguments, if any. */
+
+static boolean
+common_op_match_null_string_p (p, end, reg_info)
+ unsigned char **p, *end;
+ register_info_type *reg_info;
+{
+ int mcnt;
+ boolean ret;
+ int reg_no;
+ unsigned char *p1 = *p;
+
+ switch ((re_opcode_t) *p1++)
+ {
+ case no_op:
+ case begline:
+ case endline:
+ case begbuf:
+ case endbuf:
+ case wordbeg:
+ case wordend:
+ case wordbound:
+ case notwordbound:
+#ifdef emacs
+ case before_dot:
+ case at_dot:
+ case after_dot:
+#endif
+ break;
+
+ case start_memory:
+ reg_no = *p1;
+ assert (reg_no > 0 && reg_no <= MAX_REGNUM);
+ ret = group_match_null_string_p (&p1, end, reg_info);
+
+ /* Have to set this here in case we're checking a group which
+ contains a group and a back reference to it. */
+
+ if (REG_MATCH_NULL_STRING_P (reg_info[reg_no]) == MATCH_NULL_UNSET_VALUE)
+ REG_MATCH_NULL_STRING_P (reg_info[reg_no]) = ret;
+
+ if (!ret)
+ return false;
+ break;
+
+ /* If this is an optimized succeed_n for zero times, make the jump. */
+ case jump:
+ EXTRACT_NUMBER_AND_INCR (mcnt, p1);
+ if (mcnt >= 0)
+ p1 += mcnt;
+ else
+ return false;
+ break;
+
+ case succeed_n:
+ /* Get to the number of times to succeed. */
+ p1 += 2;
+ EXTRACT_NUMBER_AND_INCR (mcnt, p1);
+
+ if (mcnt == 0)
+ {
+ p1 -= 4;
+ EXTRACT_NUMBER_AND_INCR (mcnt, p1);
+ p1 += mcnt;
+ }
+ else
+ return false;
+ break;
+
+ case duplicate:
+ if (!REG_MATCH_NULL_STRING_P (reg_info[*p1]))
+ return false;
+ break;
+
+ case set_number_at:
+ p1 += 4;
+
+ default:
+ /* All other opcodes mean we cannot match the empty string. */
+ return false;
+ }
+
+ *p = p1;
+ return true;
+} /* common_op_match_null_string_p */
+
+
+/* Return zero if TRANSLATE[S1] and TRANSLATE[S2] are identical for LEN
+ bytes; nonzero otherwise. */
+
+static int
+bcmp_translate (s1, s2, len, translate)
+ const char *s1, *s2;
+ register int len;
+ RE_TRANSLATE_TYPE translate;
+{
+ register const unsigned char *p1 = (const unsigned char *) s1;
+ register const unsigned char *p2 = (const unsigned char *) s2;
+ while (len)
+ {
+ if (translate[*p1++] != translate[*p2++]) return 1;
+ len--;
+ }
+ return 0;
+}
+
+/* Entry points for GNU code. */
+
+/* re_compile_pattern is the GNU regular expression compiler: it
+ compiles PATTERN (of length SIZE) and puts the result in BUFP.
+ Returns 0 if the pattern was valid, otherwise an error string.
+
+ Assumes the `allocated' (and perhaps `buffer') and `translate' fields
+ are set in BUFP on entry.
+
+ We call regex_compile to do the actual compilation. */
+
+const char *
+re_compile_pattern (pattern, length, bufp)
+ const char *pattern;
+ size_t length;
+ struct re_pattern_buffer *bufp;
+{
+ reg_errcode_t ret;
+
+ /* GNU code is written to assume at least RE_NREGS registers will be set
+ (and at least one extra will be -1). */
+ bufp->regs_allocated = REGS_UNALLOCATED;
+
+ /* And GNU code determines whether or not to get register information
+ by passing null for the REGS argument to re_match, etc., not by
+ setting no_sub. */
+ bufp->no_sub = 0;
+
+ /* Match anchors at newline. */
+ bufp->newline_anchor = 1;
+
+ ret = regex_compile (pattern, length, re_syntax_options, bufp);
+
+ if (!ret)
+ return NULL;
+ return gettext (re_error_msgid[(int) ret]);
+}
+
+/* Entry points compatible with 4.2 BSD regex library. We don't define
+ them unless specifically requested. */
+
+#if defined (_REGEX_RE_COMP) || defined (_LIBC)
+
+/* BSD has one and only one pattern buffer. */
+static struct re_pattern_buffer re_comp_buf;
+
+char *
+#ifdef _LIBC
+/* Make these definitions weak in libc, so POSIX programs can redefine
+ these names if they don't use our functions, and still use
+ regcomp/regexec below without link errors. */
+weak_function
+#endif
+re_comp (s)
+ const char *s;
+{
+ reg_errcode_t ret;
+
+ if (!s)
+ {
+ if (!re_comp_buf.buffer)
+ return gettext ("No previous regular expression");
+ return 0;
+ }
+
+ if (!re_comp_buf.buffer)
+ {
+ re_comp_buf.buffer = (unsigned char *) malloc (200);
+ if (re_comp_buf.buffer == NULL)
+ return gettext (re_error_msgid[(int) REG_ESPACE]);
+ re_comp_buf.allocated = 200;
+
+ re_comp_buf.fastmap = (char *) malloc (1 << BYTEWIDTH);
+ if (re_comp_buf.fastmap == NULL)
+ return gettext (re_error_msgid[(int) REG_ESPACE]);
+ }
+
+ /* Since `re_exec' always passes NULL for the `regs' argument, we
+ don't need to initialize the pattern buffer fields which affect it. */
+
+ /* Match anchors at newlines. */
+ re_comp_buf.newline_anchor = 1;
+
+ ret = regex_compile (s, strlen (s), re_syntax_options, &re_comp_buf);
+
+ if (!ret)
+ return NULL;
+
+ /* Yes, we're discarding `const' here if !HAVE_LIBINTL. */
+ return (char *) gettext (re_error_msgid[(int) ret]);
+}
+
+
+int
+#ifdef _LIBC
+weak_function
+#endif
+re_exec (s)
+ const char *s;
+{
+ const int len = strlen (s);
+ return
+ 0 <= re_search (&re_comp_buf, s, len, 0, len, (struct re_registers *) 0);
+}
+
+#endif /* _REGEX_RE_COMP */
+
+/* POSIX.2 functions. Don't define these for Emacs. */
+
+#ifndef emacs
+
+/* regcomp takes a regular expression as a string and compiles it.
+
+ PREG is a regex_t *. We do not expect any fields to be initialized,
+ since POSIX says we shouldn't. Thus, we set
+
+ `buffer' to the compiled pattern;
+ `used' to the length of the compiled pattern;
+ `syntax' to RE_SYNTAX_POSIX_EXTENDED if the
+ REG_EXTENDED bit in CFLAGS is set; otherwise, to
+ RE_SYNTAX_POSIX_BASIC;
+ `newline_anchor' to REG_NEWLINE being set in CFLAGS;
+ `fastmap' and `fastmap_accurate' to zero;
+ `re_nsub' to the number of subexpressions in PATTERN.
+
+ PATTERN is the address of the pattern string.
+
+ CFLAGS is a series of bits which affect compilation.
+
+ If REG_EXTENDED is set, we use POSIX extended syntax; otherwise, we
+ use POSIX basic syntax.
+
+ If REG_NEWLINE is set, then . and [^...] don't match newline.
+ Also, regexec will try a match beginning after every newline.
+
+ If REG_ICASE is set, then we considers upper- and lowercase
+ versions of letters to be equivalent when matching.
+
+ If REG_NOSUB is set, then when PREG is passed to regexec, that
+ routine will report only success or failure, and nothing about the
+ registers.
+
+ It returns 0 if it succeeds, nonzero if it doesn't. (See regex.h for
+ the return codes and their meanings.) */
+
+int
+regcomp (preg, pattern, cflags)
+ regex_t *preg;
+ const char *pattern;
+ int cflags;
+{
+ reg_errcode_t ret;
+ reg_syntax_t syntax
+ = (cflags & REG_EXTENDED) ?
+ RE_SYNTAX_POSIX_EXTENDED : RE_SYNTAX_POSIX_BASIC;
+
+ /* regex_compile will allocate the space for the compiled pattern. */
+ preg->buffer = 0;
+ preg->allocated = 0;
+ preg->used = 0;
+
+ /* Don't bother to use a fastmap when searching. This simplifies the
+ REG_NEWLINE case: if we used a fastmap, we'd have to put all the
+ characters after newlines into the fastmap. This way, we just try
+ every character. */
+ preg->fastmap = 0;
+
+ if (cflags & REG_ICASE)
+ {
+ unsigned i;
+
+ preg->translate
+ = (RE_TRANSLATE_TYPE) malloc (CHAR_SET_SIZE
+ * sizeof (*(RE_TRANSLATE_TYPE)0));
+ if (preg->translate == NULL)
+ return (int) REG_ESPACE;
+
+ /* Map uppercase characters to corresponding lowercase ones. */
+ for (i = 0; i < CHAR_SET_SIZE; i++)
+ preg->translate[i] = ISUPPER (i) ? tolower (i) : i;
+ }
+ else
+ preg->translate = NULL;
+
+ /* If REG_NEWLINE is set, newlines are treated differently. */
+ if (cflags & REG_NEWLINE)
+ { /* REG_NEWLINE implies neither . nor [^...] match newline. */
+ syntax &= ~RE_DOT_NEWLINE;
+ syntax |= RE_HAT_LISTS_NOT_NEWLINE;
+ /* It also changes the matching behavior. */
+ preg->newline_anchor = 1;
+ }
+ else
+ preg->newline_anchor = 0;
+
+ preg->no_sub = !!(cflags & REG_NOSUB);
+
+ /* POSIX says a null character in the pattern terminates it, so we
+ can use strlen here in compiling the pattern. */
+ ret = regex_compile (pattern, strlen (pattern), syntax, preg);
+
+ /* POSIX doesn't distinguish between an unmatched open-group and an
+ unmatched close-group: both are REG_EPAREN. */
+ if (ret == REG_ERPAREN) ret = REG_EPAREN;
+
+ return (int) ret;
+}
+
+
+/* regexec searches for a given pattern, specified by PREG, in the
+ string STRING.
+
+ If NMATCH is zero or REG_NOSUB was set in the cflags argument to
+ `regcomp', we ignore PMATCH. Otherwise, we assume PMATCH has at
+ least NMATCH elements, and we set them to the offsets of the
+ corresponding matched substrings.
+
+ EFLAGS specifies `execution flags' which affect matching: if
+ REG_NOTBOL is set, then ^ does not match at the beginning of the
+ string; if REG_NOTEOL is set, then $ does not match at the end.
+
+ We return 0 if we find a match and REG_NOMATCH if not. */
+
+int
+regexec (preg, string, nmatch, pmatch, eflags)
+ const regex_t *preg;
+ const char *string;
+ size_t nmatch;
+ regmatch_t pmatch[];
+ int eflags;
+{
+ int ret;
+ struct re_registers regs;
+ regex_t private_preg;
+ int len = strlen (string);
+ boolean want_reg_info = !preg->no_sub && nmatch > 0;
+
+ private_preg = *preg;
+
+ private_preg.not_bol = !!(eflags & REG_NOTBOL);
+ private_preg.not_eol = !!(eflags & REG_NOTEOL);
+
+ /* The user has told us exactly how many registers to return
+ information about, via `nmatch'. We have to pass that on to the
+ matching routines. */
+ private_preg.regs_allocated = REGS_FIXED;
+
+ if (want_reg_info)
+ {
+ regs.num_regs = nmatch;
+ regs.start = TALLOC (nmatch, regoff_t);
+ regs.end = TALLOC (nmatch, regoff_t);
+ if (regs.start == NULL || regs.end == NULL)
+ return (int) REG_NOMATCH;
+ }
+
+ /* Perform the searching operation. */
+ ret = re_search (&private_preg, string, len,
+ /* start: */ 0, /* range: */ len,
+ want_reg_info ? ®s : (struct re_registers *) 0);
+
+ /* Copy the register information to the POSIX structure. */
+ if (want_reg_info)
+ {
+ if (ret >= 0)
+ {
+ unsigned r;
+
+ for (r = 0; r < nmatch; r++)
+ {
+ pmatch[r].rm_so = regs.start[r];
+ pmatch[r].rm_eo = regs.end[r];
+ }
+ }
+
+ /* If we needed the temporary register info, free the space now. */
+ free (regs.start);
+ free (regs.end);
+ }
+
+ /* We want zero return to mean success, unlike `re_search'. */
+ return ret >= 0 ? (int) REG_NOERROR : (int) REG_NOMATCH;
+}
+
+
+/* Returns a message corresponding to an error code, ERRCODE, returned
+ from either regcomp or regexec. We don't use PREG here. */
+
+size_t
+regerror (int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
+{
+ const char *msg;
+ size_t msg_size;
+
+ if (errcode < 0
+ || errcode >= (int) (sizeof (re_error_msgid)
+ / sizeof (re_error_msgid[0])))
+ /* Only error codes returned by the rest of the code should be passed
+ to this routine. If we are given anything else, or if other regex
+ code generates an invalid error code, then the program has a bug.
+ Dump core so we can fix it. */
+ abort ();
+
+ msg = gettext (re_error_msgid[errcode]);
+
+ msg_size = strlen (msg) + 1; /* Includes the null. */
+
+ if (errbuf_size != 0)
+ {
+ if (msg_size > errbuf_size)
+ {
+ strncpy (errbuf, msg, errbuf_size - 1);
+ errbuf[errbuf_size - 1] = 0;
+ }
+ else
+ strcpy (errbuf, msg);
+ }
+
+ return msg_size;
+}
+
+
+/* Free dynamically allocated space used by PREG. */
+
+void
+regfree (preg)
+ regex_t *preg;
+{
+ if (preg->buffer != NULL)
+ free (preg->buffer);
+ preg->buffer = NULL;
+
+ preg->allocated = 0;
+ preg->used = 0;
+
+ if (preg->fastmap != NULL)
+ free (preg->fastmap);
+ preg->fastmap = NULL;
+ preg->fastmap_accurate = 0;
+
+ if (preg->translate != NULL)
+ free (preg->translate);
+ preg->translate = NULL;
+}
+
+#endif /* not emacs */
Deleted: trunk/src/utilfuns/regex_internal.c
===================================================================
--- trunk/src/utilfuns/regex_internal.c 2009-12-07 04:02:43 UTC (rev 2486)
+++ trunk/src/utilfuns/regex_internal.c 2009-12-08 07:18:00 UTC (rev 2487)
@@ -1,1713 +0,0 @@
-/* Extended regular expression matching and search library.
- Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Isamu Hasegawa <isamu at yamato.ibm.com>.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-static void re_string_construct_common (const char *str, int len,
- re_string_t *pstr,
- RE_TRANSLATE_TYPE trans, int icase,
- const re_dfa_t *dfa) internal_function;
-static re_dfastate_t *create_ci_newstate (const re_dfa_t *dfa,
- const re_node_set *nodes,
- unsigned int hash) internal_function;
-static re_dfastate_t *create_cd_newstate (const re_dfa_t *dfa,
- const re_node_set *nodes,
- unsigned int context,
- unsigned int hash) internal_function;
-
-/* Functions for string operation. */
-
-/* This function allocate the buffers. It is necessary to call
- re_string_reconstruct before using the object. */
-
-static reg_errcode_t
-internal_function
-re_string_allocate (re_string_t *pstr, const char *str, int len, int init_len,
- RE_TRANSLATE_TYPE trans, int icase, const re_dfa_t *dfa)
-{
- reg_errcode_t ret;
- int init_buf_len;
-
- /* Ensure at least one character fits into the buffers. */
- if (init_len < dfa->mb_cur_max)
- init_len = dfa->mb_cur_max;
- init_buf_len = (len + 1 < init_len) ? len + 1: init_len;
- re_string_construct_common (str, len, pstr, trans, icase, dfa);
-
- ret = re_string_realloc_buffers (pstr, init_buf_len);
- if (BE (ret != REG_NOERROR, 0))
- return ret;
-
- pstr->word_char = dfa->word_char;
- pstr->word_ops_used = dfa->word_ops_used;
- pstr->mbs = pstr->mbs_allocated ? pstr->mbs : (unsigned char *) str;
- pstr->valid_len = (pstr->mbs_allocated || dfa->mb_cur_max > 1) ? 0 : len;
- pstr->valid_raw_len = pstr->valid_len;
- return REG_NOERROR;
-}
-
-/* This function allocate the buffers, and initialize them. */
-
-static reg_errcode_t
-internal_function
-re_string_construct (re_string_t *pstr, const char *str, int len,
- RE_TRANSLATE_TYPE trans, int icase, const re_dfa_t *dfa)
-{
- reg_errcode_t ret;
- memset (pstr, '\0', sizeof (re_string_t));
- re_string_construct_common (str, len, pstr, trans, icase, dfa);
-
- if (len > 0)
- {
- ret = re_string_realloc_buffers (pstr, len + 1);
- if (BE (ret != REG_NOERROR, 0))
- return ret;
- }
- pstr->mbs = pstr->mbs_allocated ? pstr->mbs : (unsigned char *) str;
-
- if (icase)
- {
-#ifdef RE_ENABLE_I18N
- if (dfa->mb_cur_max > 1)
- {
- while (1)
- {
- ret = build_wcs_upper_buffer (pstr);
- if (BE (ret != REG_NOERROR, 0))
- return ret;
- if (pstr->valid_raw_len >= len)
- break;
- if (pstr->bufs_len > pstr->valid_len + dfa->mb_cur_max)
- break;
- ret = re_string_realloc_buffers (pstr, pstr->bufs_len * 2);
- if (BE (ret != REG_NOERROR, 0))
- return ret;
- }
- }
- else
-#endif /* RE_ENABLE_I18N */
- build_upper_buffer (pstr);
- }
- else
- {
-#ifdef RE_ENABLE_I18N
- if (dfa->mb_cur_max > 1)
- build_wcs_buffer (pstr);
- else
-#endif /* RE_ENABLE_I18N */
- {
- if (trans != NULL)
- re_string_translate_buffer (pstr);
- else
- {
- pstr->valid_len = pstr->bufs_len;
- pstr->valid_raw_len = pstr->bufs_len;
- }
- }
- }
-
- return REG_NOERROR;
-}
-
-/* Helper functions for re_string_allocate, and re_string_construct. */
-
-static reg_errcode_t
-internal_function
-re_string_realloc_buffers (re_string_t *pstr, int new_buf_len)
-{
-#ifdef RE_ENABLE_I18N
- if (pstr->mb_cur_max > 1)
- {
- wint_t *new_wcs = re_realloc (pstr->wcs, wint_t, new_buf_len);
- if (BE (new_wcs == NULL, 0))
- return REG_ESPACE;
- pstr->wcs = new_wcs;
- if (pstr->offsets != NULL)
- {
- int *new_offsets = re_realloc (pstr->offsets, int, new_buf_len);
- if (BE (new_offsets == NULL, 0))
- return REG_ESPACE;
- pstr->offsets = new_offsets;
- }
- }
-#endif /* RE_ENABLE_I18N */
- if (pstr->mbs_allocated)
- {
- unsigned char *new_mbs = re_realloc (pstr->mbs, unsigned char,
- new_buf_len);
- if (BE (new_mbs == NULL, 0))
- return REG_ESPACE;
- pstr->mbs = new_mbs;
- }
- pstr->bufs_len = new_buf_len;
- return REG_NOERROR;
-}
-
-
-static void
-internal_function
-re_string_construct_common (const char *str, int len, re_string_t *pstr,
- RE_TRANSLATE_TYPE trans, int icase,
- const re_dfa_t *dfa)
-{
- pstr->raw_mbs = (const unsigned char *) str;
- pstr->len = len;
- pstr->raw_len = len;
- pstr->trans = trans;
- pstr->icase = icase ? 1 : 0;
- pstr->mbs_allocated = (trans != NULL || icase);
- pstr->mb_cur_max = dfa->mb_cur_max;
- pstr->is_utf8 = dfa->is_utf8;
- pstr->map_notascii = dfa->map_notascii;
- pstr->stop = pstr->len;
- pstr->raw_stop = pstr->stop;
-}
-
-#ifdef RE_ENABLE_I18N
-
-/* Build wide character buffer PSTR->WCS.
- If the byte sequence of the string are:
- <mb1>(0), <mb1>(1), <mb2>(0), <mb2>(1), <sb3>
- Then wide character buffer will be:
- <wc1> , WEOF , <wc2> , WEOF , <wc3>
- We use WEOF for padding, they indicate that the position isn't
- a first byte of a multibyte character.
-
- Note that this function assumes PSTR->VALID_LEN elements are already
- built and starts from PSTR->VALID_LEN. */
-
-static void
-internal_function
-build_wcs_buffer (re_string_t *pstr)
-{
-#ifdef _LIBC
- unsigned char buf[MB_LEN_MAX];
- assert (MB_LEN_MAX >= pstr->mb_cur_max);
-#else
- unsigned char buf[64];
-#endif
- mbstate_t prev_st;
- int byte_idx, end_idx, remain_len;
- size_t mbclen;
-
- /* Build the buffers from pstr->valid_len to either pstr->len or
- pstr->bufs_len. */
- end_idx = (pstr->bufs_len > pstr->len) ? pstr->len : pstr->bufs_len;
- for (byte_idx = pstr->valid_len; byte_idx < end_idx;)
- {
- wchar_t wc;
- const char *p;
-
- remain_len = end_idx - byte_idx;
- prev_st = pstr->cur_state;
- /* Apply the translation if we need. */
- if (BE (pstr->trans != NULL, 0))
- {
- int i, ch;
-
- for (i = 0; i < pstr->mb_cur_max && i < remain_len; ++i)
- {
- ch = pstr->raw_mbs [pstr->raw_mbs_idx + byte_idx + i];
- buf[i] = pstr->mbs[byte_idx + i] = pstr->trans[ch];
- }
- p = (const char *) buf;
- }
- else
- p = (const char *) pstr->raw_mbs + pstr->raw_mbs_idx + byte_idx;
- mbclen = __mbrtowc (&wc, p, remain_len, &pstr->cur_state);
- if (BE (mbclen == (size_t) -2, 0))
- {
- /* The buffer doesn't have enough space, finish to build. */
- pstr->cur_state = prev_st;
- break;
- }
- else if (BE (mbclen == (size_t) -1 || mbclen == 0, 0))
- {
- /* We treat these cases as a singlebyte character. */
- mbclen = 1;
- wc = (wchar_t) pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx];
- if (BE (pstr->trans != NULL, 0))
- wc = pstr->trans[wc];
- pstr->cur_state = prev_st;
- }
-
- /* Write wide character and padding. */
- pstr->wcs[byte_idx++] = wc;
- /* Write paddings. */
- for (remain_len = byte_idx + mbclen - 1; byte_idx < remain_len ;)
- pstr->wcs[byte_idx++] = WEOF;
- }
- pstr->valid_len = byte_idx;
- pstr->valid_raw_len = byte_idx;
-}
-
-/* Build wide character buffer PSTR->WCS like build_wcs_buffer,
- but for REG_ICASE. */
-
-static reg_errcode_t
-internal_function
-build_wcs_upper_buffer (re_string_t *pstr)
-{
- mbstate_t prev_st;
- int src_idx, byte_idx, end_idx, remain_len;
- size_t mbclen;
-#ifdef _LIBC
- char buf[MB_LEN_MAX];
- assert (MB_LEN_MAX >= pstr->mb_cur_max);
-#else
- char buf[64];
-#endif
-
- byte_idx = pstr->valid_len;
- end_idx = (pstr->bufs_len > pstr->len) ? pstr->len : pstr->bufs_len;
-
- /* The following optimization assumes that ASCII characters can be
- mapped to wide characters with a simple cast. */
- if (! pstr->map_notascii && pstr->trans == NULL && !pstr->offsets_needed)
- {
- while (byte_idx < end_idx)
- {
- wchar_t wc;
-
- if (isascii (pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx])
- && mbsinit (&pstr->cur_state))
- {
- /* In case of a singlebyte character. */
- pstr->mbs[byte_idx]
- = toupper (pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx]);
- /* The next step uses the assumption that wchar_t is encoded
- ASCII-safe: all ASCII values can be converted like this. */
- pstr->wcs[byte_idx] = (wchar_t) pstr->mbs[byte_idx];
- ++byte_idx;
- continue;
- }
-
- remain_len = end_idx - byte_idx;
- prev_st = pstr->cur_state;
- mbclen = __mbrtowc (&wc,
- ((const char *) pstr->raw_mbs + pstr->raw_mbs_idx
- + byte_idx), remain_len, &pstr->cur_state);
- if (BE (mbclen + 2 > 2, 1))
- {
- wchar_t wcu = wc;
- if (iswlower (wc))
- {
- size_t mbcdlen;
-
- wcu = towupper (wc);
- mbcdlen = wcrtomb (buf, wcu, &prev_st);
- if (BE (mbclen == mbcdlen, 1))
- memcpy (pstr->mbs + byte_idx, buf, mbclen);
- else
- {
- src_idx = byte_idx;
- goto offsets_needed;
- }
- }
- else
- memcpy (pstr->mbs + byte_idx,
- pstr->raw_mbs + pstr->raw_mbs_idx + byte_idx, mbclen);
- pstr->wcs[byte_idx++] = wcu;
- /* Write paddings. */
- for (remain_len = byte_idx + mbclen - 1; byte_idx < remain_len ;)
- pstr->wcs[byte_idx++] = WEOF;
- }
- else if (mbclen == (size_t) -1 || mbclen == 0)
- {
- /* It is an invalid character or '\0'. Just use the byte. */
- int ch = pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx];
- pstr->mbs[byte_idx] = ch;
- /* And also cast it to wide char. */
- pstr->wcs[byte_idx++] = (wchar_t) ch;
- if (BE (mbclen == (size_t) -1, 0))
- pstr->cur_state = prev_st;
- }
- else
- {
- /* The buffer doesn't have enough space, finish to build. */
- pstr->cur_state = prev_st;
- break;
- }
- }
- pstr->valid_len = byte_idx;
- pstr->valid_raw_len = byte_idx;
- return REG_NOERROR;
- }
- else
- for (src_idx = pstr->valid_raw_len; byte_idx < end_idx;)
- {
- wchar_t wc;
- const char *p;
- offsets_needed:
- remain_len = end_idx - byte_idx;
- prev_st = pstr->cur_state;
- if (BE (pstr->trans != NULL, 0))
- {
- int i, ch;
-
- for (i = 0; i < pstr->mb_cur_max && i < remain_len; ++i)
- {
- ch = pstr->raw_mbs [pstr->raw_mbs_idx + src_idx + i];
- buf[i] = pstr->trans[ch];
- }
- p = (const char *) buf;
- }
- else
- p = (const char *) pstr->raw_mbs + pstr->raw_mbs_idx + src_idx;
- mbclen = __mbrtowc (&wc, p, remain_len, &pstr->cur_state);
- if (BE (mbclen + 2 > 2, 1))
- {
- wchar_t wcu = wc;
- if (iswlower (wc))
- {
- size_t mbcdlen;
-
- wcu = towupper (wc);
- mbcdlen = wcrtomb ((char *) buf, wcu, &prev_st);
- if (BE (mbclen == mbcdlen, 1))
- memcpy (pstr->mbs + byte_idx, buf, mbclen);
- else if (mbcdlen != (size_t) -1)
- {
- size_t i;
-
- if (byte_idx + mbcdlen > pstr->bufs_len)
- {
- pstr->cur_state = prev_st;
- break;
- }
-
- if (pstr->offsets == NULL)
- {
- pstr->offsets = re_malloc (int, pstr->bufs_len);
-
- if (pstr->offsets == NULL)
- return REG_ESPACE;
- }
- if (!pstr->offsets_needed)
- {
- for (i = 0; i < (size_t) byte_idx; ++i)
- pstr->offsets[i] = i;
- pstr->offsets_needed = 1;
- }
-
- memcpy (pstr->mbs + byte_idx, buf, mbcdlen);
- pstr->wcs[byte_idx] = wcu;
- pstr->offsets[byte_idx] = src_idx;
- for (i = 1; i < mbcdlen; ++i)
- {
- pstr->offsets[byte_idx + i]
- = src_idx + (i < mbclen ? i : mbclen - 1);
- pstr->wcs[byte_idx + i] = WEOF;
- }
- pstr->len += mbcdlen - mbclen;
- if (pstr->raw_stop > src_idx)
- pstr->stop += mbcdlen - mbclen;
- end_idx = (pstr->bufs_len > pstr->len)
- ? pstr->len : pstr->bufs_len;
- byte_idx += mbcdlen;
- src_idx += mbclen;
- continue;
- }
- else
- memcpy (pstr->mbs + byte_idx, p, mbclen);
- }
- else
- memcpy (pstr->mbs + byte_idx, p, mbclen);
-
- if (BE (pstr->offsets_needed != 0, 0))
- {
- size_t i;
- for (i = 0; i < mbclen; ++i)
- pstr->offsets[byte_idx + i] = src_idx + i;
- }
- src_idx += mbclen;
-
- pstr->wcs[byte_idx++] = wcu;
- /* Write paddings. */
- for (remain_len = byte_idx + mbclen - 1; byte_idx < remain_len ;)
- pstr->wcs[byte_idx++] = WEOF;
- }
- else if (mbclen == (size_t) -1 || mbclen == 0)
- {
- /* It is an invalid character or '\0'. Just use the byte. */
- int ch = pstr->raw_mbs[pstr->raw_mbs_idx + src_idx];
-
- if (BE (pstr->trans != NULL, 0))
- ch = pstr->trans [ch];
- pstr->mbs[byte_idx] = ch;
-
- if (BE (pstr->offsets_needed != 0, 0))
- pstr->offsets[byte_idx] = src_idx;
- ++src_idx;
-
- /* And also cast it to wide char. */
- pstr->wcs[byte_idx++] = (wchar_t) ch;
- if (BE (mbclen == (size_t) -1, 0))
- pstr->cur_state = prev_st;
- }
- else
- {
- /* The buffer doesn't have enough space, finish to build. */
- pstr->cur_state = prev_st;
- break;
- }
- }
- pstr->valid_len = byte_idx;
- pstr->valid_raw_len = src_idx;
- return REG_NOERROR;
-}
-
-/* Skip characters until the index becomes greater than NEW_RAW_IDX.
- Return the index. */
-
-static int
-internal_function
-re_string_skip_chars (re_string_t *pstr, int new_raw_idx, wint_t *last_wc)
-{
- mbstate_t prev_st;
- int rawbuf_idx;
- size_t mbclen;
- wchar_t wc = WEOF;
-
- /* Skip the characters which are not necessary to check. */
- for (rawbuf_idx = pstr->raw_mbs_idx + pstr->valid_raw_len;
- rawbuf_idx < new_raw_idx;)
- {
- int remain_len;
- remain_len = pstr->len - rawbuf_idx;
- prev_st = pstr->cur_state;
- mbclen = __mbrtowc (&wc, (const char *) pstr->raw_mbs + rawbuf_idx,
- remain_len, &pstr->cur_state);
- if (BE (mbclen == (size_t) -2 || mbclen == (size_t) -1 || mbclen == 0, 0))
- {
- /* We treat these cases as a single byte character. */
- if (mbclen == 0 || remain_len == 0)
- wc = L'\0';
- else
- wc = *(unsigned char *) (pstr->raw_mbs + rawbuf_idx);
- mbclen = 1;
- pstr->cur_state = prev_st;
- }
- /* Then proceed the next character. */
- rawbuf_idx += mbclen;
- }
- *last_wc = (wint_t) wc;
- return rawbuf_idx;
-}
-#endif /* RE_ENABLE_I18N */
-
-/* Build the buffer PSTR->MBS, and apply the translation if we need.
- This function is used in case of REG_ICASE. */
-
-static void
-internal_function
-build_upper_buffer (re_string_t *pstr)
-{
- int char_idx, end_idx;
- end_idx = (pstr->bufs_len > pstr->len) ? pstr->len : pstr->bufs_len;
-
- for (char_idx = pstr->valid_len; char_idx < end_idx; ++char_idx)
- {
- int ch = pstr->raw_mbs[pstr->raw_mbs_idx + char_idx];
- if (BE (pstr->trans != NULL, 0))
- ch = pstr->trans[ch];
- if (islower (ch))
- pstr->mbs[char_idx] = toupper (ch);
- else
- pstr->mbs[char_idx] = ch;
- }
- pstr->valid_len = char_idx;
- pstr->valid_raw_len = char_idx;
-}
-
-/* Apply TRANS to the buffer in PSTR. */
-
-static void
-internal_function
-re_string_translate_buffer (re_string_t *pstr)
-{
- int buf_idx, end_idx;
- end_idx = (pstr->bufs_len > pstr->len) ? pstr->len : pstr->bufs_len;
-
- for (buf_idx = pstr->valid_len; buf_idx < end_idx; ++buf_idx)
- {
- int ch = pstr->raw_mbs[pstr->raw_mbs_idx + buf_idx];
- pstr->mbs[buf_idx] = pstr->trans[ch];
- }
-
- pstr->valid_len = buf_idx;
- pstr->valid_raw_len = buf_idx;
-}
-
-/* This function re-construct the buffers.
- Concretely, convert to wide character in case of pstr->mb_cur_max > 1,
- convert to upper case in case of REG_ICASE, apply translation. */
-
-static reg_errcode_t
-internal_function
-re_string_reconstruct (re_string_t *pstr, int idx, int eflags)
-{
- int offset = idx - pstr->raw_mbs_idx;
- if (BE (offset < 0, 0))
- {
- /* Reset buffer. */
-#ifdef RE_ENABLE_I18N
- if (pstr->mb_cur_max > 1)
- memset (&pstr->cur_state, '\0', sizeof (mbstate_t));
-#endif /* RE_ENABLE_I18N */
- pstr->len = pstr->raw_len;
- pstr->stop = pstr->raw_stop;
- pstr->valid_len = 0;
- pstr->raw_mbs_idx = 0;
- pstr->valid_raw_len = 0;
- pstr->offsets_needed = 0;
- pstr->tip_context = ((eflags & REG_NOTBOL) ? CONTEXT_BEGBUF
- : CONTEXT_NEWLINE | CONTEXT_BEGBUF);
- if (!pstr->mbs_allocated)
- pstr->mbs = (unsigned char *) pstr->raw_mbs;
- offset = idx;
- }
-
- if (BE (offset != 0, 1))
- {
- /* Should the already checked characters be kept? */
- if (BE (offset < pstr->valid_raw_len, 1))
- {
- /* Yes, move them to the front of the buffer. */
-#ifdef RE_ENABLE_I18N
- if (BE (pstr->offsets_needed, 0))
- {
- int low = 0, high = pstr->valid_len, mid;
- do
- {
- mid = (high + low) / 2;
- if (pstr->offsets[mid] > offset)
- high = mid;
- else if (pstr->offsets[mid] < offset)
- low = mid + 1;
- else
- break;
- }
- while (low < high);
- if (pstr->offsets[mid] < offset)
- ++mid;
- pstr->tip_context = re_string_context_at (pstr, mid - 1,
- eflags);
- /* This can be quite complicated, so handle specially
- only the common and easy case where the character with
- different length representation of lower and upper
- case is present at or after offset. */
- if (pstr->valid_len > offset
- && mid == offset && pstr->offsets[mid] == offset)
- {
- memmove (pstr->wcs, pstr->wcs + offset,
- (pstr->valid_len - offset) * sizeof (wint_t));
- memmove (pstr->mbs, pstr->mbs + offset, pstr->valid_len - offset);
- pstr->valid_len -= offset;
- pstr->valid_raw_len -= offset;
- for (low = 0; low < pstr->valid_len; low++)
- pstr->offsets[low] = pstr->offsets[low + offset] - offset;
- }
- else
- {
- /* Otherwise, just find out how long the partial multibyte
- character at offset is and fill it with WEOF/255. */
- pstr->len = pstr->raw_len - idx + offset;
- pstr->stop = pstr->raw_stop - idx + offset;
- pstr->offsets_needed = 0;
- while (mid > 0 && pstr->offsets[mid - 1] == offset)
- --mid;
- while (mid < pstr->valid_len)
- if (pstr->wcs[mid] != WEOF)
- break;
- else
- ++mid;
- if (mid == pstr->valid_len)
- pstr->valid_len = 0;
- else
- {
- pstr->valid_len = pstr->offsets[mid] - offset;
- if (pstr->valid_len)
- {
- for (low = 0; low < pstr->valid_len; ++low)
- pstr->wcs[low] = WEOF;
- memset (pstr->mbs, 255, pstr->valid_len);
- }
- }
- pstr->valid_raw_len = pstr->valid_len;
- }
- }
- else
-#endif
- {
- pstr->tip_context = re_string_context_at (pstr, offset - 1,
- eflags);
-#ifdef RE_ENABLE_I18N
- if (pstr->mb_cur_max > 1)
- memmove (pstr->wcs, pstr->wcs + offset,
- (pstr->valid_len - offset) * sizeof (wint_t));
-#endif /* RE_ENABLE_I18N */
- if (BE (pstr->mbs_allocated, 0))
- memmove (pstr->mbs, pstr->mbs + offset,
- pstr->valid_len - offset);
- pstr->valid_len -= offset;
- pstr->valid_raw_len -= offset;
-#if DEBUG
- assert (pstr->valid_len > 0);
-#endif
- }
- }
- else
- {
- /* No, skip all characters until IDX. */
- int prev_valid_len = pstr->valid_len;
-
-#ifdef RE_ENABLE_I18N
- if (BE (pstr->offsets_needed, 0))
- {
- pstr->len = pstr->raw_len - idx + offset;
- pstr->stop = pstr->raw_stop - idx + offset;
- pstr->offsets_needed = 0;
- }
-#endif
- pstr->valid_len = 0;
-#ifdef RE_ENABLE_I18N
- if (pstr->mb_cur_max > 1)
- {
- int wcs_idx;
- wint_t wc = WEOF;
-
- if (pstr->is_utf8)
- {
- const unsigned char *raw, *p, *q, *end;
-
- /* Special case UTF-8. Multi-byte chars start with any
- byte other than 0x80 - 0xbf. */
- raw = pstr->raw_mbs + pstr->raw_mbs_idx;
- end = raw + (offset - pstr->mb_cur_max);
- if (end < pstr->raw_mbs)
- end = pstr->raw_mbs;
- p = raw + offset - 1;
-#ifdef _LIBC
- /* We know the wchar_t encoding is UCS4, so for the simple
- case, ASCII characters, skip the conversion step. */
- if (isascii (*p) && BE (pstr->trans == NULL, 1))
- {
- memset (&pstr->cur_state, '\0', sizeof (mbstate_t));
- /* pstr->valid_len = 0; */
- wc = (wchar_t) *p;
- }
- else
-#endif
- for (; p >= end; --p)
- if ((*p & 0xc0) != 0x80)
- {
- mbstate_t cur_state;
- wchar_t wc2;
- int mlen = raw + pstr->len - p;
- unsigned char buf[6];
- size_t mbclen;
-
- q = p;
- if (BE (pstr->trans != NULL, 0))
- {
- int i = mlen < 6 ? mlen : 6;
- while (--i >= 0)
- buf[i] = pstr->trans[p[i]];
- q = buf;
- }
- /* XXX Don't use mbrtowc, we know which conversion
- to use (UTF-8 -> UCS4). */
- memset (&cur_state, 0, sizeof (cur_state));
- mbclen = __mbrtowc (&wc2, (const char *) p, mlen,
- &cur_state);
- if (raw + offset - p <= mbclen
- && mbclen < (size_t) -2)
- {
- memset (&pstr->cur_state, '\0',
- sizeof (mbstate_t));
- pstr->valid_len = mbclen - (raw + offset - p);
- wc = wc2;
- }
- break;
- }
- }
-
- if (wc == WEOF)
- pstr->valid_len = re_string_skip_chars (pstr, idx, &wc) - idx;
- if (wc == WEOF)
- pstr->tip_context
- = re_string_context_at (pstr, prev_valid_len - 1, eflags);
- else
- pstr->tip_context = ((BE (pstr->word_ops_used != 0, 0)
- && IS_WIDE_WORD_CHAR (wc))
- ? CONTEXT_WORD
- : ((IS_WIDE_NEWLINE (wc)
- && pstr->newline_anchor)
- ? CONTEXT_NEWLINE : 0));
- if (BE (pstr->valid_len, 0))
- {
- for (wcs_idx = 0; wcs_idx < pstr->valid_len; ++wcs_idx)
- pstr->wcs[wcs_idx] = WEOF;
- if (pstr->mbs_allocated)
- memset (pstr->mbs, 255, pstr->valid_len);
- }
- pstr->valid_raw_len = pstr->valid_len;
- }
- else
-#endif /* RE_ENABLE_I18N */
- {
- int c = pstr->raw_mbs[pstr->raw_mbs_idx + offset - 1];
- pstr->valid_raw_len = 0;
- if (pstr->trans)
- c = pstr->trans[c];
- pstr->tip_context = (bitset_contain (pstr->word_char, c)
- ? CONTEXT_WORD
- : ((IS_NEWLINE (c) && pstr->newline_anchor)
- ? CONTEXT_NEWLINE : 0));
- }
- }
- if (!BE (pstr->mbs_allocated, 0))
- pstr->mbs += offset;
- }
- pstr->raw_mbs_idx = idx;
- pstr->len -= offset;
- pstr->stop -= offset;
-
- /* Then build the buffers. */
-#ifdef RE_ENABLE_I18N
- if (pstr->mb_cur_max > 1)
- {
- if (pstr->icase)
- {
- reg_errcode_t ret = build_wcs_upper_buffer (pstr);
- if (BE (ret != REG_NOERROR, 0))
- return ret;
- }
- else
- build_wcs_buffer (pstr);
- }
- else
-#endif /* RE_ENABLE_I18N */
- if (BE (pstr->mbs_allocated, 0))
- {
- if (pstr->icase)
- build_upper_buffer (pstr);
- else if (pstr->trans != NULL)
- re_string_translate_buffer (pstr);
- }
- else
- pstr->valid_len = pstr->len;
-
- pstr->cur_idx = 0;
- return REG_NOERROR;
-}
-
-static unsigned char
-internal_function __attribute ((pure))
-re_string_peek_byte_case (const re_string_t *pstr, int idx)
-{
- int ch, off;
-
- /* Handle the common (easiest) cases first. */
- if (BE (!pstr->mbs_allocated, 1))
- return re_string_peek_byte (pstr, idx);
-
-#ifdef RE_ENABLE_I18N
- if (pstr->mb_cur_max > 1
- && ! re_string_is_single_byte_char (pstr, pstr->cur_idx + idx))
- return re_string_peek_byte (pstr, idx);
-#endif
-
- off = pstr->cur_idx + idx;
-#ifdef RE_ENABLE_I18N
- if (pstr->offsets_needed)
- off = pstr->offsets[off];
-#endif
-
- ch = pstr->raw_mbs[pstr->raw_mbs_idx + off];
-
-#ifdef RE_ENABLE_I18N
- /* Ensure that e.g. for tr_TR.UTF-8 BACKSLASH DOTLESS SMALL LETTER I
- this function returns CAPITAL LETTER I instead of first byte of
- DOTLESS SMALL LETTER I. The latter would confuse the parser,
- since peek_byte_case doesn't advance cur_idx in any way. */
- if (pstr->offsets_needed && !isascii (ch))
- return re_string_peek_byte (pstr, idx);
-#endif
-
- return ch;
-}
-
-static unsigned char
-internal_function __attribute ((pure))
-re_string_fetch_byte_case (re_string_t *pstr)
-{
- if (BE (!pstr->mbs_allocated, 1))
- return re_string_fetch_byte (pstr);
-
-#ifdef RE_ENABLE_I18N
- if (pstr->offsets_needed)
- {
- int off, ch;
-
- /* For tr_TR.UTF-8 [[:islower:]] there is
- [[: CAPITAL LETTER I WITH DOT lower:]] in mbs. Skip
- in that case the whole multi-byte character and return
- the original letter. On the other side, with
- [[: DOTLESS SMALL LETTER I return [[:I, as doing
- anything else would complicate things too much. */
-
- if (!re_string_first_byte (pstr, pstr->cur_idx))
- return re_string_fetch_byte (pstr);
-
- off = pstr->offsets[pstr->cur_idx];
- ch = pstr->raw_mbs[pstr->raw_mbs_idx + off];
-
- if (! isascii (ch))
- return re_string_fetch_byte (pstr);
-
- re_string_skip_bytes (pstr,
- re_string_char_size_at (pstr, pstr->cur_idx));
- return ch;
- }
-#endif
-
- return pstr->raw_mbs[pstr->raw_mbs_idx + pstr->cur_idx++];
-}
-
-static void
-internal_function
-re_string_destruct (re_string_t *pstr)
-{
-#ifdef RE_ENABLE_I18N
- re_free (pstr->wcs);
- re_free (pstr->offsets);
-#endif /* RE_ENABLE_I18N */
- if (pstr->mbs_allocated)
- re_free (pstr->mbs);
-}
-
-/* Return the context at IDX in INPUT. */
-
-static unsigned int
-internal_function
-re_string_context_at (const re_string_t *input, int idx, int eflags)
-{
- int c;
- if (BE (idx < 0, 0))
- /* In this case, we use the value stored in input->tip_context,
- since we can't know the character in input->mbs[-1] here. */
- return input->tip_context;
- if (BE (idx == input->len, 0))
- return ((eflags & REG_NOTEOL) ? CONTEXT_ENDBUF
- : CONTEXT_NEWLINE | CONTEXT_ENDBUF);
-#ifdef RE_ENABLE_I18N
- if (input->mb_cur_max > 1)
- {
- wint_t wc;
- int wc_idx = idx;
- while(input->wcs[wc_idx] == WEOF)
- {
-#ifdef DEBUG
- /* It must not happen. */
- assert (wc_idx >= 0);
-#endif
- --wc_idx;
- if (wc_idx < 0)
- return input->tip_context;
- }
- wc = input->wcs[wc_idx];
- if (BE (input->word_ops_used != 0, 0) && IS_WIDE_WORD_CHAR (wc))
- return CONTEXT_WORD;
- return (IS_WIDE_NEWLINE (wc) && input->newline_anchor
- ? CONTEXT_NEWLINE : 0);
- }
- else
-#endif
- {
- c = re_string_byte_at (input, idx);
- if (bitset_contain (input->word_char, c))
- return CONTEXT_WORD;
- return IS_NEWLINE (c) && input->newline_anchor ? CONTEXT_NEWLINE : 0;
- }
-}
-
-/* Functions for set operation. */
-
-static reg_errcode_t
-internal_function
-re_node_set_alloc (re_node_set *set, int size)
-{
- set->alloc = size;
- set->nelem = 0;
- set->elems = re_malloc (int, size);
- if (BE (set->elems == NULL, 0))
- return REG_ESPACE;
- return REG_NOERROR;
-}
-
-static reg_errcode_t
-internal_function
-re_node_set_init_1 (re_node_set *set, int elem)
-{
- set->alloc = 1;
- set->nelem = 1;
- set->elems = re_malloc (int, 1);
- if (BE (set->elems == NULL, 0))
- {
- set->alloc = set->nelem = 0;
- return REG_ESPACE;
- }
- set->elems[0] = elem;
- return REG_NOERROR;
-}
-
-static reg_errcode_t
-internal_function
-re_node_set_init_2 (re_node_set *set, int elem1, int elem2)
-{
- set->alloc = 2;
- set->elems = re_malloc (int, 2);
- if (BE (set->elems == NULL, 0))
- return REG_ESPACE;
- if (elem1 == elem2)
- {
- set->nelem = 1;
- set->elems[0] = elem1;
- }
- else
- {
- set->nelem = 2;
- if (elem1 < elem2)
- {
- set->elems[0] = elem1;
- set->elems[1] = elem2;
- }
- else
- {
- set->elems[0] = elem2;
- set->elems[1] = elem1;
- }
- }
- return REG_NOERROR;
-}
-
-static reg_errcode_t
-internal_function
-re_node_set_init_copy (re_node_set *dest, const re_node_set *src)
-{
- dest->nelem = src->nelem;
- if (src->nelem > 0)
- {
- dest->alloc = dest->nelem;
- dest->elems = re_malloc (int, dest->alloc);
- if (BE (dest->elems == NULL, 0))
- {
- dest->alloc = dest->nelem = 0;
- return REG_ESPACE;
- }
- memcpy (dest->elems, src->elems, src->nelem * sizeof (int));
- }
- else
- re_node_set_init_empty (dest);
- return REG_NOERROR;
-}
-
-/* Calculate the intersection of the sets SRC1 and SRC2. And merge it to
- DEST. Return value indicate the error code or REG_NOERROR if succeeded.
- Note: We assume dest->elems is NULL, when dest->alloc is 0. */
-
-static reg_errcode_t
-internal_function
-re_node_set_add_intersect (re_node_set *dest, const re_node_set *src1,
- const re_node_set *src2)
-{
- int i1, i2, is, id, delta, sbase;
- if (src1->nelem == 0 || src2->nelem == 0)
- return REG_NOERROR;
-
- /* We need dest->nelem + 2 * elems_in_intersection; this is a
- conservative estimate. */
- if (src1->nelem + src2->nelem + dest->nelem > dest->alloc)
- {
- int new_alloc = src1->nelem + src2->nelem + dest->alloc;
- int *new_elems = re_realloc (dest->elems, int, new_alloc);
- if (BE (new_elems == NULL, 0))
- return REG_ESPACE;
- dest->elems = new_elems;
- dest->alloc = new_alloc;
- }
-
- /* Find the items in the intersection of SRC1 and SRC2, and copy
- into the top of DEST those that are not already in DEST itself. */
- sbase = dest->nelem + src1->nelem + src2->nelem;
- i1 = src1->nelem - 1;
- i2 = src2->nelem - 1;
- id = dest->nelem - 1;
- for (;;)
- {
- if (src1->elems[i1] == src2->elems[i2])
- {
- /* Try to find the item in DEST. Maybe we could binary search? */
- while (id >= 0 && dest->elems[id] > src1->elems[i1])
- --id;
-
- if (id < 0 || dest->elems[id] != src1->elems[i1])
- dest->elems[--sbase] = src1->elems[i1];
-
- if (--i1 < 0 || --i2 < 0)
- break;
- }
-
- /* Lower the highest of the two items. */
- else if (src1->elems[i1] < src2->elems[i2])
- {
- if (--i2 < 0)
- break;
- }
- else
- {
- if (--i1 < 0)
- break;
- }
- }
-
- id = dest->nelem - 1;
- is = dest->nelem + src1->nelem + src2->nelem - 1;
- delta = is - sbase + 1;
-
- /* Now copy. When DELTA becomes zero, the remaining
- DEST elements are already in place; this is more or
- less the same loop that is in re_node_set_merge. */
- dest->nelem += delta;
- if (delta > 0 && id >= 0)
- for (;;)
- {
- if (dest->elems[is] > dest->elems[id])
- {
- /* Copy from the top. */
- dest->elems[id + delta--] = dest->elems[is--];
- if (delta == 0)
- break;
- }
- else
- {
- /* Slide from the bottom. */
- dest->elems[id + delta] = dest->elems[id];
- if (--id < 0)
- break;
- }
- }
-
- /* Copy remaining SRC elements. */
- memcpy (dest->elems, dest->elems + sbase, delta * sizeof (int));
-
- return REG_NOERROR;
-}
-
-/* Calculate the union set of the sets SRC1 and SRC2. And store it to
- DEST. Return value indicate the error code or REG_NOERROR if succeeded. */
-
-static reg_errcode_t
-internal_function
-re_node_set_init_union (re_node_set *dest, const re_node_set *src1,
- const re_node_set *src2)
-{
- int i1, i2, id;
- if (src1 != NULL && src1->nelem > 0 && src2 != NULL && src2->nelem > 0)
- {
- dest->alloc = src1->nelem + src2->nelem;
- dest->elems = re_malloc (int, dest->alloc);
- if (BE (dest->elems == NULL, 0))
- return REG_ESPACE;
- }
- else
- {
- if (src1 != NULL && src1->nelem > 0)
- return re_node_set_init_copy (dest, src1);
- else if (src2 != NULL && src2->nelem > 0)
- return re_node_set_init_copy (dest, src2);
- else
- re_node_set_init_empty (dest);
- return REG_NOERROR;
- }
- for (i1 = i2 = id = 0 ; i1 < src1->nelem && i2 < src2->nelem ;)
- {
- if (src1->elems[i1] > src2->elems[i2])
- {
- dest->elems[id++] = src2->elems[i2++];
- continue;
- }
- if (src1->elems[i1] == src2->elems[i2])
- ++i2;
- dest->elems[id++] = src1->elems[i1++];
- }
- if (i1 < src1->nelem)
- {
- memcpy (dest->elems + id, src1->elems + i1,
- (src1->nelem - i1) * sizeof (int));
- id += src1->nelem - i1;
- }
- else if (i2 < src2->nelem)
- {
- memcpy (dest->elems + id, src2->elems + i2,
- (src2->nelem - i2) * sizeof (int));
- id += src2->nelem - i2;
- }
- dest->nelem = id;
- return REG_NOERROR;
-}
-
-/* Calculate the union set of the sets DEST and SRC. And store it to
- DEST. Return value indicate the error code or REG_NOERROR if succeeded. */
-
-static reg_errcode_t
-internal_function
-re_node_set_merge (re_node_set *dest, const re_node_set *src)
-{
- int is, id, sbase, delta;
- if (src == NULL || src->nelem == 0)
- return REG_NOERROR;
- if (dest->alloc < 2 * src->nelem + dest->nelem)
- {
- int new_alloc = 2 * (src->nelem + dest->alloc);
- int *new_buffer = re_realloc (dest->elems, int, new_alloc);
- if (BE (new_buffer == NULL, 0))
- return REG_ESPACE;
- dest->elems = new_buffer;
- dest->alloc = new_alloc;
- }
-
- if (BE (dest->nelem == 0, 0))
- {
- dest->nelem = src->nelem;
- memcpy (dest->elems, src->elems, src->nelem * sizeof (int));
- return REG_NOERROR;
- }
-
- /* Copy into the top of DEST the items of SRC that are not
- found in DEST. Maybe we could binary search in DEST? */
- for (sbase = dest->nelem + 2 * src->nelem,
- is = src->nelem - 1, id = dest->nelem - 1; is >= 0 && id >= 0; )
- {
- if (dest->elems[id] == src->elems[is])
- is--, id--;
- else if (dest->elems[id] < src->elems[is])
- dest->elems[--sbase] = src->elems[is--];
- else /* if (dest->elems[id] > src->elems[is]) */
- --id;
- }
-
- if (is >= 0)
- {
- /* If DEST is exhausted, the remaining items of SRC must be unique. */
- sbase -= is + 1;
- memcpy (dest->elems + sbase, src->elems, (is + 1) * sizeof (int));
- }
-
- id = dest->nelem - 1;
- is = dest->nelem + 2 * src->nelem - 1;
- delta = is - sbase + 1;
- if (delta == 0)
- return REG_NOERROR;
-
- /* Now copy. When DELTA becomes zero, the remaining
- DEST elements are already in place. */
- dest->nelem += delta;
- for (;;)
- {
- if (dest->elems[is] > dest->elems[id])
- {
- /* Copy from the top. */
- dest->elems[id + delta--] = dest->elems[is--];
- if (delta == 0)
- break;
- }
- else
- {
- /* Slide from the bottom. */
- dest->elems[id + delta] = dest->elems[id];
- if (--id < 0)
- {
- /* Copy remaining SRC elements. */
- memcpy (dest->elems, dest->elems + sbase,
- delta * sizeof (int));
- break;
- }
- }
- }
-
- return REG_NOERROR;
-}
-
-/* Insert the new element ELEM to the re_node_set* SET.
- SET should not already have ELEM.
- return -1 if an error is occured, return 1 otherwise. */
-
-static int
-internal_function
-re_node_set_insert (re_node_set *set, int elem)
-{
- int idx;
- /* In case the set is empty. */
- if (set->alloc == 0)
- {
- if (BE (re_node_set_init_1 (set, elem) == REG_NOERROR, 1))
- return 1;
- else
- return -1;
- }
-
- if (BE (set->nelem, 0) == 0)
- {
- /* We already guaranteed above that set->alloc != 0. */
- set->elems[0] = elem;
- ++set->nelem;
- return 1;
- }
-
- /* Realloc if we need. */
- if (set->alloc == set->nelem)
- {
- int *new_elems;
- set->alloc = set->alloc * 2;
- new_elems = re_realloc (set->elems, int, set->alloc);
- if (BE (new_elems == NULL, 0))
- return -1;
- set->elems = new_elems;
- }
-
- /* Move the elements which follows the new element. Test the
- first element separately to skip a check in the inner loop. */
- if (elem < set->elems[0])
- {
- idx = 0;
- for (idx = set->nelem; idx > 0; idx--)
- set->elems[idx] = set->elems[idx - 1];
- }
- else
- {
- for (idx = set->nelem; set->elems[idx - 1] > elem; idx--)
- set->elems[idx] = set->elems[idx - 1];
- }
-
- /* Insert the new element. */
- set->elems[idx] = elem;
- ++set->nelem;
- return 1;
-}
-
-/* Insert the new element ELEM to the re_node_set* SET.
- SET should not already have any element greater than or equal to ELEM.
- Return -1 if an error is occured, return 1 otherwise. */
-
-static int
-internal_function
-re_node_set_insert_last (re_node_set *set, int elem)
-{
- /* Realloc if we need. */
- if (set->alloc == set->nelem)
- {
- int *new_elems;
- set->alloc = (set->alloc + 1) * 2;
- new_elems = re_realloc (set->elems, int, set->alloc);
- if (BE (new_elems == NULL, 0))
- return -1;
- set->elems = new_elems;
- }
-
- /* Insert the new element. */
- set->elems[set->nelem++] = elem;
- return 1;
-}
-
-/* Compare two node sets SET1 and SET2.
- return 1 if SET1 and SET2 are equivalent, return 0 otherwise. */
-
-static int
-internal_function __attribute ((pure))
-re_node_set_compare (const re_node_set *set1, const re_node_set *set2)
-{
- int i;
- if (set1 == NULL || set2 == NULL || set1->nelem != set2->nelem)
- return 0;
- for (i = set1->nelem ; --i >= 0 ; )
- if (set1->elems[i] != set2->elems[i])
- return 0;
- return 1;
-}
-
-/* Return (idx + 1) if SET contains the element ELEM, return 0 otherwise. */
-
-static int
-internal_function __attribute ((pure))
-re_node_set_contains (const re_node_set *set, int elem)
-{
- unsigned int idx, right, mid;
- if (set->nelem <= 0)
- return 0;
-
- /* Binary search the element. */
- idx = 0;
- right = set->nelem - 1;
- while (idx < right)
- {
- mid = (idx + right) / 2;
- if (set->elems[mid] < elem)
- idx = mid + 1;
- else
- right = mid;
- }
- return set->elems[idx] == elem ? idx + 1 : 0;
-}
-
-static void
-internal_function
-re_node_set_remove_at (re_node_set *set, int idx)
-{
- if (idx < 0 || idx >= set->nelem)
- return;
- --set->nelem;
- for (; idx < set->nelem; idx++)
- set->elems[idx] = set->elems[idx + 1];
-}
-
-
-/* Add the token TOKEN to dfa->nodes, and return the index of the token.
- Or return -1, if an error will be occured. */
-
-static int
-internal_function
-re_dfa_add_node (re_dfa_t *dfa, re_token_t token)
-{
- int type = token.type;
- if (BE (dfa->nodes_len >= dfa->nodes_alloc, 0))
- {
- size_t new_nodes_alloc = dfa->nodes_alloc * 2;
- int *new_nexts, *new_indices;
- re_node_set *new_edests, *new_eclosures;
- re_token_t *new_nodes;
-
- /* Avoid overflows. */
- if (BE (new_nodes_alloc < dfa->nodes_alloc, 0))
- return -1;
-
- new_nodes = re_realloc (dfa->nodes, re_token_t, new_nodes_alloc);
- if (BE (new_nodes == NULL, 0))
- return -1;
- dfa->nodes = new_nodes;
- new_nexts = re_realloc (dfa->nexts, int, new_nodes_alloc);
- new_indices = re_realloc (dfa->org_indices, int, new_nodes_alloc);
- new_edests = re_realloc (dfa->edests, re_node_set, new_nodes_alloc);
- new_eclosures = re_realloc (dfa->eclosures, re_node_set, new_nodes_alloc);
- if (BE (new_nexts == NULL || new_indices == NULL
- || new_edests == NULL || new_eclosures == NULL, 0))
- return -1;
- dfa->nexts = new_nexts;
- dfa->org_indices = new_indices;
- dfa->edests = new_edests;
- dfa->eclosures = new_eclosures;
- dfa->nodes_alloc = new_nodes_alloc;
- }
- dfa->nodes[dfa->nodes_len] = token;
- dfa->nodes[dfa->nodes_len].constraint = 0;
-#ifdef RE_ENABLE_I18N
- dfa->nodes[dfa->nodes_len].accept_mb =
- (type == OP_PERIOD && dfa->mb_cur_max > 1) || type == COMPLEX_BRACKET;
-#endif
- dfa->nexts[dfa->nodes_len] = -1;
- re_node_set_init_empty (dfa->edests + dfa->nodes_len);
- re_node_set_init_empty (dfa->eclosures + dfa->nodes_len);
- return dfa->nodes_len++;
-}
-
-static inline unsigned int
-internal_function
-calc_state_hash (const re_node_set *nodes, unsigned int context)
-{
- unsigned int hash = nodes->nelem + context;
- int i;
- for (i = 0 ; i < nodes->nelem ; i++)
- hash += nodes->elems[i];
- return hash;
-}
-
-/* Search for the state whose node_set is equivalent to NODES.
- Return the pointer to the state, if we found it in the DFA.
- Otherwise create the new one and return it. In case of an error
- return NULL and set the error code in ERR.
- Note: - We assume NULL as the invalid state, then it is possible that
- return value is NULL and ERR is REG_NOERROR.
- - We never return non-NULL value in case of any errors, it is for
- optimization. */
-
-static re_dfastate_t *
-internal_function
-re_acquire_state (reg_errcode_t *err, const re_dfa_t *dfa,
- const re_node_set *nodes)
-{
- unsigned int hash;
- re_dfastate_t *new_state;
- struct re_state_table_entry *spot;
- int i;
- if (BE (nodes->nelem == 0, 0))
- {
- *err = REG_NOERROR;
- return NULL;
- }
- hash = calc_state_hash (nodes, 0);
- spot = dfa->state_table + (hash & dfa->state_hash_mask);
-
- for (i = 0 ; i < spot->num ; i++)
- {
- re_dfastate_t *state = spot->array[i];
- if (hash != state->hash)
- continue;
- if (re_node_set_compare (&state->nodes, nodes))
- return state;
- }
-
- /* There are no appropriate state in the dfa, create the new one. */
- new_state = create_ci_newstate (dfa, nodes, hash);
- if (BE (new_state == NULL, 0))
- *err = REG_ESPACE;
-
- return new_state;
-}
-
-/* Search for the state whose node_set is equivalent to NODES and
- whose context is equivalent to CONTEXT.
- Return the pointer to the state, if we found it in the DFA.
- Otherwise create the new one and return it. In case of an error
- return NULL and set the error code in ERR.
- Note: - We assume NULL as the invalid state, then it is possible that
- return value is NULL and ERR is REG_NOERROR.
- - We never return non-NULL value in case of any errors, it is for
- optimization. */
-
-static re_dfastate_t *
-internal_function
-re_acquire_state_context (reg_errcode_t *err, const re_dfa_t *dfa,
- const re_node_set *nodes, unsigned int context)
-{
- unsigned int hash;
- re_dfastate_t *new_state;
- struct re_state_table_entry *spot;
- int i;
- if (nodes->nelem == 0)
- {
- *err = REG_NOERROR;
- return NULL;
- }
- hash = calc_state_hash (nodes, context);
- spot = dfa->state_table + (hash & dfa->state_hash_mask);
-
- for (i = 0 ; i < spot->num ; i++)
- {
- re_dfastate_t *state = spot->array[i];
- if (state->hash == hash
- && state->context == context
- && re_node_set_compare (state->entrance_nodes, nodes))
- return state;
- }
- /* There are no appropriate state in `dfa', create the new one. */
- new_state = create_cd_newstate (dfa, nodes, context, hash);
- if (BE (new_state == NULL, 0))
- *err = REG_ESPACE;
-
- return new_state;
-}
-
-/* Finish initialization of the new state NEWSTATE, and using its hash value
- HASH put in the appropriate bucket of DFA's state table. Return value
- indicates the error code if failed. */
-
-static reg_errcode_t
-register_state (const re_dfa_t *dfa, re_dfastate_t *newstate,
- unsigned int hash)
-{
- struct re_state_table_entry *spot;
- reg_errcode_t err;
- int i;
-
- newstate->hash = hash;
- err = re_node_set_alloc (&newstate->non_eps_nodes, newstate->nodes.nelem);
- if (BE (err != REG_NOERROR, 0))
- return REG_ESPACE;
- for (i = 0; i < newstate->nodes.nelem; i++)
- {
- int elem = newstate->nodes.elems[i];
- if (!IS_EPSILON_NODE (dfa->nodes[elem].type))
- re_node_set_insert_last (&newstate->non_eps_nodes, elem);
- }
-
- spot = dfa->state_table + (hash & dfa->state_hash_mask);
- if (BE (spot->alloc <= spot->num, 0))
- {
- int new_alloc = 2 * spot->num + 2;
- re_dfastate_t **new_array = re_realloc (spot->array, re_dfastate_t *,
- new_alloc);
- if (BE (new_array == NULL, 0))
- return REG_ESPACE;
- spot->array = new_array;
- spot->alloc = new_alloc;
- }
- spot->array[spot->num++] = newstate;
- return REG_NOERROR;
-}
-
-static void
-free_state (re_dfastate_t *state)
-{
- re_node_set_free (&state->non_eps_nodes);
- re_node_set_free (&state->inveclosure);
- if (state->entrance_nodes != &state->nodes)
- {
- re_node_set_free (state->entrance_nodes);
- re_free (state->entrance_nodes);
- }
- re_node_set_free (&state->nodes);
- re_free (state->word_trtable);
- re_free (state->trtable);
- re_free (state);
-}
-
-/* Create the new state which is independ of contexts.
- Return the new state if succeeded, otherwise return NULL. */
-
-static re_dfastate_t *
-internal_function
-create_ci_newstate (const re_dfa_t *dfa, const re_node_set *nodes,
- unsigned int hash)
-{
- int i;
- reg_errcode_t err;
- re_dfastate_t *newstate;
-
- newstate = (re_dfastate_t *) calloc (sizeof (re_dfastate_t), 1);
- if (BE (newstate == NULL, 0))
- return NULL;
- err = re_node_set_init_copy (&newstate->nodes, nodes);
- if (BE (err != REG_NOERROR, 0))
- {
- re_free (newstate);
- return NULL;
- }
-
- newstate->entrance_nodes = &newstate->nodes;
- for (i = 0 ; i < nodes->nelem ; i++)
- {
- re_token_t *node = dfa->nodes + nodes->elems[i];
- re_token_type_t type = node->type;
- if (type == CHARACTER && !node->constraint)
- continue;
-#ifdef RE_ENABLE_I18N
- newstate->accept_mb |= node->accept_mb;
-#endif /* RE_ENABLE_I18N */
-
- /* If the state has the halt node, the state is a halt state. */
- if (type == END_OF_RE)
- newstate->halt = 1;
- else if (type == OP_BACK_REF)
- newstate->has_backref = 1;
- else if (type == ANCHOR || node->constraint)
- newstate->has_constraint = 1;
- }
- err = register_state (dfa, newstate, hash);
- if (BE (err != REG_NOERROR, 0))
- {
- free_state (newstate);
- newstate = NULL;
- }
- return newstate;
-}
-
-/* Create the new state which is depend on the context CONTEXT.
- Return the new state if succeeded, otherwise return NULL. */
-
-static re_dfastate_t *
-internal_function
-create_cd_newstate (const re_dfa_t *dfa, const re_node_set *nodes,
- unsigned int context, unsigned int hash)
-{
- int i, nctx_nodes = 0;
- reg_errcode_t err;
- re_dfastate_t *newstate;
-
- newstate = (re_dfastate_t *) calloc (sizeof (re_dfastate_t), 1);
- if (BE (newstate == NULL, 0))
- return NULL;
- err = re_node_set_init_copy (&newstate->nodes, nodes);
- if (BE (err != REG_NOERROR, 0))
- {
- re_free (newstate);
- return NULL;
- }
-
- newstate->context = context;
- newstate->entrance_nodes = &newstate->nodes;
-
- for (i = 0 ; i < nodes->nelem ; i++)
- {
- re_token_t *node = dfa->nodes + nodes->elems[i];
- re_token_type_t type = node->type;
- unsigned int constraint = node->constraint;
-
- if (type == CHARACTER && !constraint)
- continue;
-#ifdef RE_ENABLE_I18N
- newstate->accept_mb |= node->accept_mb;
-#endif /* RE_ENABLE_I18N */
-
- /* If the state has the halt node, the state is a halt state. */
- if (type == END_OF_RE)
- newstate->halt = 1;
- else if (type == OP_BACK_REF)
- newstate->has_backref = 1;
-
- if (constraint)
- {
- if (newstate->entrance_nodes == &newstate->nodes)
- {
- newstate->entrance_nodes = re_malloc (re_node_set, 1);
- if (BE (newstate->entrance_nodes == NULL, 0))
- {
- free_state (newstate);
- return NULL;
- }
- re_node_set_init_copy (newstate->entrance_nodes, nodes);
- nctx_nodes = 0;
- newstate->has_constraint = 1;
- }
-
- if (NOT_SATISFY_PREV_CONSTRAINT (constraint,context))
- {
- re_node_set_remove_at (&newstate->nodes, i - nctx_nodes);
- ++nctx_nodes;
- }
- }
- }
- err = register_state (dfa, newstate, hash);
- if (BE (err != REG_NOERROR, 0))
- {
- free_state (newstate);
- newstate = NULL;
- }
- return newstate;
-}
Deleted: trunk/src/utilfuns/regex_internal.h
===================================================================
--- trunk/src/utilfuns/regex_internal.h 2009-12-07 04:02:43 UTC (rev 2486)
+++ trunk/src/utilfuns/regex_internal.h 2009-12-08 07:18:00 UTC (rev 2487)
@@ -1,769 +0,0 @@
-/* Extended regular expression matching and search library.
- Copyright (C) 2002-2005, 2007, 2008 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Isamu Hasegawa <isamu at yamato.ibm.com>.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-#ifndef _REGEX_INTERNAL_H
-#define _REGEX_INTERNAL_H 1
-
-#include <assert.h>
-#include <ctype.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#if defined HAVE_LANGINFO_H || defined HAVE_LANGINFO_CODESET || defined _LIBC
-# include <langinfo.h>
-#endif
-#if defined HAVE_LOCALE_H || defined _LIBC
-# include <locale.h>
-#endif
-#if defined HAVE_WCHAR_H || defined _LIBC
-# include <wchar.h>
-#endif /* HAVE_WCHAR_H || _LIBC */
-#if defined HAVE_WCTYPE_H || defined _LIBC
-# include <wctype.h>
-#endif /* HAVE_WCTYPE_H || _LIBC */
-#if defined HAVE_STDBOOL_H || defined _LIBC
-# include <stdbool.h>
-#endif /* HAVE_STDBOOL_H || _LIBC */
-#if defined HAVE_STDINT_H || defined _LIBC
-# include <stdint.h>
-#endif /* HAVE_STDINT_H || _LIBC */
-#if defined _LIBC
-# include <bits/libc-lock.h>
-#else
-# define __libc_lock_define(CLASS,NAME)
-# define __libc_lock_init(NAME) do { } while (0)
-# define __libc_lock_lock(NAME) do { } while (0)
-# define __libc_lock_unlock(NAME) do { } while (0)
-#endif
-
-/* In case that the system doesn't have isblank(). */
-#if !defined _LIBC && !defined HAVE_ISBLANK && !defined isblank
-# define isblank(ch) ((ch) == ' ' || (ch) == '\t')
-#endif
-
-#ifdef _LIBC
-# ifndef _RE_DEFINE_LOCALE_FUNCTIONS
-# define _RE_DEFINE_LOCALE_FUNCTIONS 1
-# include <locale/localeinfo.h>
-# include <locale/elem-hash.h>
-# include <locale/coll-lookup.h>
-# endif
-#endif
-
-/* This is for other GNU distributions with internationalized messages. */
-#if (HAVE_LIBINTL_H && ENABLE_NLS) || defined _LIBC
-# include <libintl.h>
-# ifdef _LIBC
-# undef gettext
-# define gettext(msgid) \
- INTUSE(__dcgettext) (_libc_intl_domainname, msgid, LC_MESSAGES)
-# endif
-#else
-# define gettext(msgid) (msgid)
-#endif
-
-#ifndef gettext_noop
-/* This define is so xgettext can find the internationalizable
- strings. */
-# define gettext_noop(String) String
-#endif
-
-/* For loser systems without the definition. */
-#ifndef SIZE_MAX
-# define SIZE_MAX ((size_t) -1)
-#endif
-
-#if (defined MB_CUR_MAX && HAVE_LOCALE_H && HAVE_WCTYPE_H && HAVE_WCHAR_H && HAVE_WCRTOMB && HAVE_MBRTOWC && HAVE_WCSCOLL) || _LIBC
-# define RE_ENABLE_I18N
-#endif
-
-#if __GNUC__ >= 3
-# define BE(expr, val) __builtin_expect (expr, val)
-#else
-# define BE(expr, val) (expr)
-# define inline
-#endif
-
-/* Number of single byte character. */
-#define SBC_MAX 256
-
-#define COLL_ELEM_LEN_MAX 8
-
-/* The character which represents newline. */
-#define NEWLINE_CHAR '\n'
-#define WIDE_NEWLINE_CHAR L'\n'
-
-/* Rename to standard API for using out of glibc. */
-#ifndef _LIBC
-# define __wctype wctype
-# define __iswctype iswctype
-# define __btowc btowc
-# define __mbrtowc mbrtowc
-# define __mempcpy mempcpy
-# define __wcrtomb wcrtomb
-# define __regfree regfree
-# define attribute_hidden
-#endif /* not _LIBC */
-
-#ifdef __GNUC__
-# define __attribute(arg) __attribute__ (arg)
-#else
-# define __attribute(arg)
-#endif
-
-extern const char __re_error_msgid[] attribute_hidden;
-extern const size_t __re_error_msgid_idx[] attribute_hidden;
-
-/* An integer used to represent a set of bits. It must be unsigned,
- and must be at least as wide as unsigned int. */
-typedef unsigned long int bitset_word_t;
-/* All bits set in a bitset_word_t. */
-#define BITSET_WORD_MAX ULONG_MAX
-/* Number of bits in a bitset_word_t. */
-#define BITSET_WORD_BITS (sizeof (bitset_word_t) * CHAR_BIT)
-/* Number of bitset_word_t in a bit_set. */
-#define BITSET_WORDS (SBC_MAX / BITSET_WORD_BITS)
-typedef bitset_word_t bitset_t[BITSET_WORDS];
-typedef bitset_word_t *re_bitset_ptr_t;
-typedef const bitset_word_t *re_const_bitset_ptr_t;
-
-#define bitset_set(set,i) \
- (set[i / BITSET_WORD_BITS] |= (bitset_word_t) 1 << i % BITSET_WORD_BITS)
-#define bitset_clear(set,i) \
- (set[i / BITSET_WORD_BITS] &= ~((bitset_word_t) 1 << i % BITSET_WORD_BITS))
-#define bitset_contain(set,i) \
- (set[i / BITSET_WORD_BITS] & ((bitset_word_t) 1 << i % BITSET_WORD_BITS))
-#define bitset_empty(set) memset (set, '\0', sizeof (bitset_t))
-#define bitset_set_all(set) memset (set, '\xff', sizeof (bitset_t))
-#define bitset_copy(dest,src) memcpy (dest, src, sizeof (bitset_t))
-
-#define PREV_WORD_CONSTRAINT 0x0001
-#define PREV_NOTWORD_CONSTRAINT 0x0002
-#define NEXT_WORD_CONSTRAINT 0x0004
-#define NEXT_NOTWORD_CONSTRAINT 0x0008
-#define PREV_NEWLINE_CONSTRAINT 0x0010
-#define NEXT_NEWLINE_CONSTRAINT 0x0020
-#define PREV_BEGBUF_CONSTRAINT 0x0040
-#define NEXT_ENDBUF_CONSTRAINT 0x0080
-#define WORD_DELIM_CONSTRAINT 0x0100
-#define NOT_WORD_DELIM_CONSTRAINT 0x0200
-
-typedef enum
-{
- INSIDE_WORD = PREV_WORD_CONSTRAINT | NEXT_WORD_CONSTRAINT,
- WORD_FIRST = PREV_NOTWORD_CONSTRAINT | NEXT_WORD_CONSTRAINT,
- WORD_LAST = PREV_WORD_CONSTRAINT | NEXT_NOTWORD_CONSTRAINT,
- INSIDE_NOTWORD = PREV_NOTWORD_CONSTRAINT | NEXT_NOTWORD_CONSTRAINT,
- LINE_FIRST = PREV_NEWLINE_CONSTRAINT,
- LINE_LAST = NEXT_NEWLINE_CONSTRAINT,
- BUF_FIRST = PREV_BEGBUF_CONSTRAINT,
- BUF_LAST = NEXT_ENDBUF_CONSTRAINT,
- WORD_DELIM = WORD_DELIM_CONSTRAINT,
- NOT_WORD_DELIM = NOT_WORD_DELIM_CONSTRAINT
-} re_context_type;
-
-typedef struct
-{
- int alloc;
- int nelem;
- int *elems;
-} re_node_set;
-
-typedef enum
-{
- NON_TYPE = 0,
-
- /* Node type, These are used by token, node, tree. */
- CHARACTER = 1,
- END_OF_RE = 2,
- SIMPLE_BRACKET = 3,
- OP_BACK_REF = 4,
- OP_PERIOD = 5,
-#ifdef RE_ENABLE_I18N
- COMPLEX_BRACKET = 6,
- OP_UTF8_PERIOD = 7,
-#endif /* RE_ENABLE_I18N */
-
- /* We define EPSILON_BIT as a macro so that OP_OPEN_SUBEXP is used
- when the debugger shows values of this enum type. */
-#define EPSILON_BIT 8
- OP_OPEN_SUBEXP = EPSILON_BIT | 0,
- OP_CLOSE_SUBEXP = EPSILON_BIT | 1,
- OP_ALT = EPSILON_BIT | 2,
- OP_DUP_ASTERISK = EPSILON_BIT | 3,
- ANCHOR = EPSILON_BIT | 4,
-
- /* Tree type, these are used only by tree. */
- CONCAT = 16,
- SUBEXP = 17,
-
- /* Token type, these are used only by token. */
- OP_DUP_PLUS = 18,
- OP_DUP_QUESTION,
- OP_OPEN_BRACKET,
- OP_CLOSE_BRACKET,
- OP_CHARSET_RANGE,
- OP_OPEN_DUP_NUM,
- OP_CLOSE_DUP_NUM,
- OP_NON_MATCH_LIST,
- OP_OPEN_COLL_ELEM,
- OP_CLOSE_COLL_ELEM,
- OP_OPEN_EQUIV_CLASS,
- OP_CLOSE_EQUIV_CLASS,
- OP_OPEN_CHAR_CLASS,
- OP_CLOSE_CHAR_CLASS,
- OP_WORD,
- OP_NOTWORD,
- OP_SPACE,
- OP_NOTSPACE,
- BACK_SLASH
-
-} re_token_type_t;
-
-#ifdef RE_ENABLE_I18N
-typedef struct
-{
- /* Multibyte characters. */
- wchar_t *mbchars;
-
- /* Collating symbols. */
-# ifdef _LIBC
- int32_t *coll_syms;
-# endif
-
- /* Equivalence classes. */
-# ifdef _LIBC
- int32_t *equiv_classes;
-# endif
-
- /* Range expressions. */
-# ifdef _LIBC
- uint32_t *range_starts;
- uint32_t *range_ends;
-# else /* not _LIBC */
- wchar_t *range_starts;
- wchar_t *range_ends;
-# endif /* not _LIBC */
-
- /* Character classes. */
- wctype_t *char_classes;
-
- /* If this character set is the non-matching list. */
- unsigned int non_match : 1;
-
- /* # of multibyte characters. */
- int nmbchars;
-
- /* # of collating symbols. */
- int ncoll_syms;
-
- /* # of equivalence classes. */
- int nequiv_classes;
-
- /* # of range expressions. */
- int nranges;
-
- /* # of character classes. */
- int nchar_classes;
-} re_charset_t;
-#endif /* RE_ENABLE_I18N */
-
-typedef struct
-{
- union
- {
- unsigned char c; /* for CHARACTER */
- re_bitset_ptr_t sbcset; /* for SIMPLE_BRACKET */
-#ifdef RE_ENABLE_I18N
- re_charset_t *mbcset; /* for COMPLEX_BRACKET */
-#endif /* RE_ENABLE_I18N */
- int idx; /* for BACK_REF */
- re_context_type ctx_type; /* for ANCHOR */
- } opr;
-#if __GNUC__ >= 2
- re_token_type_t type : 8;
-#else
- re_token_type_t type;
-#endif
- unsigned int constraint : 10; /* context constraint */
- unsigned int duplicated : 1;
- unsigned int opt_subexp : 1;
-#ifdef RE_ENABLE_I18N
- unsigned int accept_mb : 1;
- /* These 2 bits can be moved into the union if needed (e.g. if running out
- of bits; move opr.c to opr.c.c and move the flags to opr.c.flags). */
- unsigned int mb_partial : 1;
-#endif
- unsigned int word_char : 1;
-} re_token_t;
-
-#define IS_EPSILON_NODE(type) ((type) & EPSILON_BIT)
-
-struct re_string_t
-{
- /* Indicate the raw buffer which is the original string passed as an
- argument of regexec(), re_search(), etc.. */
- const unsigned char *raw_mbs;
- /* Store the multibyte string. In case of "case insensitive mode" like
- REG_ICASE, upper cases of the string are stored, otherwise MBS points
- the same address that RAW_MBS points. */
- unsigned char *mbs;
-#ifdef RE_ENABLE_I18N
- /* Store the wide character string which is corresponding to MBS. */
- wint_t *wcs;
- int *offsets;
- mbstate_t cur_state;
-#endif
- /* Index in RAW_MBS. Each character mbs[i] corresponds to
- raw_mbs[raw_mbs_idx + i]. */
- int raw_mbs_idx;
- /* The length of the valid characters in the buffers. */
- int valid_len;
- /* The corresponding number of bytes in raw_mbs array. */
- int valid_raw_len;
- /* The length of the buffers MBS and WCS. */
- int bufs_len;
- /* The index in MBS, which is updated by re_string_fetch_byte. */
- int cur_idx;
- /* length of RAW_MBS array. */
- int raw_len;
- /* This is RAW_LEN - RAW_MBS_IDX + VALID_LEN - VALID_RAW_LEN. */
- int len;
- /* End of the buffer may be shorter than its length in the cases such
- as re_match_2, re_search_2. Then, we use STOP for end of the buffer
- instead of LEN. */
- int raw_stop;
- /* This is RAW_STOP - RAW_MBS_IDX adjusted through OFFSETS. */
- int stop;
-
- /* The context of mbs[0]. We store the context independently, since
- the context of mbs[0] may be different from raw_mbs[0], which is
- the beginning of the input string. */
- unsigned int tip_context;
- /* The translation passed as a part of an argument of re_compile_pattern. */
- RE_TRANSLATE_TYPE trans;
- /* Copy of re_dfa_t's word_char. */
- re_const_bitset_ptr_t word_char;
- /* 1 if REG_ICASE. */
- unsigned char icase;
- unsigned char is_utf8;
- unsigned char map_notascii;
- unsigned char mbs_allocated;
- unsigned char offsets_needed;
- unsigned char newline_anchor;
- unsigned char word_ops_used;
- int mb_cur_max;
-};
-typedef struct re_string_t re_string_t;
-
-
-struct re_dfa_t;
-typedef struct re_dfa_t re_dfa_t;
-
-#ifndef _LIBC
-# ifdef __i386__
-# define internal_function __attribute ((regparm (3), stdcall))
-# else
-# define internal_function
-# endif
-#endif
-
-#ifndef NOT_IN_libc
-static reg_errcode_t re_string_realloc_buffers (re_string_t *pstr,
- int new_buf_len)
- internal_function;
-# ifdef RE_ENABLE_I18N
-static void build_wcs_buffer (re_string_t *pstr) internal_function;
-static reg_errcode_t build_wcs_upper_buffer (re_string_t *pstr)
- internal_function;
-# endif /* RE_ENABLE_I18N */
-static void build_upper_buffer (re_string_t *pstr) internal_function;
-static void re_string_translate_buffer (re_string_t *pstr) internal_function;
-static unsigned int re_string_context_at (const re_string_t *input, int idx,
- int eflags)
- internal_function __attribute ((pure));
-#endif
-#define re_string_peek_byte(pstr, offset) \
- ((pstr)->mbs[(pstr)->cur_idx + offset])
-#define re_string_fetch_byte(pstr) \
- ((pstr)->mbs[(pstr)->cur_idx++])
-#define re_string_first_byte(pstr, idx) \
- ((idx) == (pstr)->valid_len || (pstr)->wcs[idx] != WEOF)
-#define re_string_is_single_byte_char(pstr, idx) \
- ((pstr)->wcs[idx] != WEOF && ((pstr)->valid_len == (idx) + 1 \
- || (pstr)->wcs[(idx) + 1] != WEOF))
-#define re_string_eoi(pstr) ((pstr)->stop <= (pstr)->cur_idx)
-#define re_string_cur_idx(pstr) ((pstr)->cur_idx)
-#define re_string_get_buffer(pstr) ((pstr)->mbs)
-#define re_string_length(pstr) ((pstr)->len)
-#define re_string_byte_at(pstr,idx) ((pstr)->mbs[idx])
-#define re_string_skip_bytes(pstr,idx) ((pstr)->cur_idx += (idx))
-#define re_string_set_index(pstr,idx) ((pstr)->cur_idx = (idx))
-
-#include <alloca.h>
-
-#ifndef _LIBC
-# if HAVE_ALLOCA
-/* The OS usually guarantees only one guard page at the bottom of the stack,
- and a page size can be as small as 4096 bytes. So we cannot safely
- allocate anything larger than 4096 bytes. Also care for the possibility
- of a few compiler-allocated temporary stack slots. */
-# define __libc_use_alloca(n) ((n) < 4032)
-# else
-/* alloca is implemented with malloc, so just use malloc. */
-# define __libc_use_alloca(n) 0
-# endif
-#endif
-
-#define re_malloc(t,n) ((t *) malloc ((n) * sizeof (t)))
-#define re_realloc(p,t,n) ((t *) realloc (p, (n) * sizeof (t)))
-#define re_free(p) free (p)
-
-struct bin_tree_t
-{
- struct bin_tree_t *parent;
- struct bin_tree_t *left;
- struct bin_tree_t *right;
- struct bin_tree_t *first;
- struct bin_tree_t *next;
-
- re_token_t token;
-
- /* `node_idx' is the index in dfa->nodes, if `type' == 0.
- Otherwise `type' indicate the type of this node. */
- int node_idx;
-};
-typedef struct bin_tree_t bin_tree_t;
-
-#define BIN_TREE_STORAGE_SIZE \
- ((1024 - sizeof (void *)) / sizeof (bin_tree_t))
-
-struct bin_tree_storage_t
-{
- struct bin_tree_storage_t *next;
- bin_tree_t data[BIN_TREE_STORAGE_SIZE];
-};
-typedef struct bin_tree_storage_t bin_tree_storage_t;
-
-#define CONTEXT_WORD 1
-#define CONTEXT_NEWLINE (CONTEXT_WORD << 1)
-#define CONTEXT_BEGBUF (CONTEXT_NEWLINE << 1)
-#define CONTEXT_ENDBUF (CONTEXT_BEGBUF << 1)
-
-#define IS_WORD_CONTEXT(c) ((c) & CONTEXT_WORD)
-#define IS_NEWLINE_CONTEXT(c) ((c) & CONTEXT_NEWLINE)
-#define IS_BEGBUF_CONTEXT(c) ((c) & CONTEXT_BEGBUF)
-#define IS_ENDBUF_CONTEXT(c) ((c) & CONTEXT_ENDBUF)
-#define IS_ORDINARY_CONTEXT(c) ((c) == 0)
-
-#define IS_WORD_CHAR(ch) (isalnum (ch) || (ch) == '_')
-#define IS_NEWLINE(ch) ((ch) == NEWLINE_CHAR)
-#define IS_WIDE_WORD_CHAR(ch) (iswalnum (ch) || (ch) == L'_')
-#define IS_WIDE_NEWLINE(ch) ((ch) == WIDE_NEWLINE_CHAR)
-
-#define NOT_SATISFY_PREV_CONSTRAINT(constraint,context) \
- ((((constraint) & PREV_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \
- || ((constraint & PREV_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \
- || ((constraint & PREV_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context))\
- || ((constraint & PREV_BEGBUF_CONSTRAINT) && !IS_BEGBUF_CONTEXT (context)))
-
-#define NOT_SATISFY_NEXT_CONSTRAINT(constraint,context) \
- ((((constraint) & NEXT_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \
- || (((constraint) & NEXT_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \
- || (((constraint) & NEXT_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context)) \
- || (((constraint) & NEXT_ENDBUF_CONSTRAINT) && !IS_ENDBUF_CONTEXT (context)))
-
-struct re_dfastate_t
-{
- unsigned int hash;
- re_node_set nodes;
- re_node_set non_eps_nodes;
- re_node_set inveclosure;
- re_node_set *entrance_nodes;
- struct re_dfastate_t **trtable, **word_trtable;
- unsigned int context : 4;
- unsigned int halt : 1;
- /* If this state can accept `multi byte'.
- Note that we refer to multibyte characters, and multi character
- collating elements as `multi byte'. */
- unsigned int accept_mb : 1;
- /* If this state has backreference node(s). */
- unsigned int has_backref : 1;
- unsigned int has_constraint : 1;
-};
-typedef struct re_dfastate_t re_dfastate_t;
-
-struct re_state_table_entry
-{
- int num;
- int alloc;
- re_dfastate_t **array;
-};
-
-/* Array type used in re_sub_match_last_t and re_sub_match_top_t. */
-
-typedef struct
-{
- int next_idx;
- int alloc;
- re_dfastate_t **array;
-} state_array_t;
-
-/* Store information about the node NODE whose type is OP_CLOSE_SUBEXP. */
-
-typedef struct
-{
- int node;
- int str_idx; /* The position NODE match at. */
- state_array_t path;
-} re_sub_match_last_t;
-
-/* Store information about the node NODE whose type is OP_OPEN_SUBEXP.
- And information about the node, whose type is OP_CLOSE_SUBEXP,
- corresponding to NODE is stored in LASTS. */
-
-typedef struct
-{
- int str_idx;
- int node;
- state_array_t *path;
- int alasts; /* Allocation size of LASTS. */
- int nlasts; /* The number of LASTS. */
- re_sub_match_last_t **lasts;
-} re_sub_match_top_t;
-
-struct re_backref_cache_entry
-{
- int node;
- int str_idx;
- int subexp_from;
- int subexp_to;
- char more;
- char unused;
- unsigned short int eps_reachable_subexps_map;
-};
-
-typedef struct
-{
- /* The string object corresponding to the input string. */
- re_string_t input;
-#if defined _LIBC || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
- const re_dfa_t *const dfa;
-#else
- const re_dfa_t *dfa;
-#endif
- /* EFLAGS of the argument of regexec. */
- int eflags;
- /* Where the matching ends. */
- int match_last;
- int last_node;
- /* The state log used by the matcher. */
- re_dfastate_t **state_log;
- int state_log_top;
- /* Back reference cache. */
- int nbkref_ents;
- int abkref_ents;
- struct re_backref_cache_entry *bkref_ents;
- int max_mb_elem_len;
- int nsub_tops;
- int asub_tops;
- re_sub_match_top_t **sub_tops;
-} re_match_context_t;
-
-typedef struct
-{
- re_dfastate_t **sifted_states;
- re_dfastate_t **limited_states;
- int last_node;
- int last_str_idx;
- re_node_set limits;
-} re_sift_context_t;
-
-struct re_fail_stack_ent_t
-{
- int idx;
- int node;
- regmatch_t *regs;
- re_node_set eps_via_nodes;
-};
-
-struct re_fail_stack_t
-{
- int num;
- int alloc;
- struct re_fail_stack_ent_t *stack;
-};
-
-struct re_dfa_t
-{
- re_token_t *nodes;
- size_t nodes_alloc;
- size_t nodes_len;
- int *nexts;
- int *org_indices;
- re_node_set *edests;
- re_node_set *eclosures;
- re_node_set *inveclosures;
- struct re_state_table_entry *state_table;
- re_dfastate_t *init_state;
- re_dfastate_t *init_state_word;
- re_dfastate_t *init_state_nl;
- re_dfastate_t *init_state_begbuf;
- bin_tree_t *str_tree;
- bin_tree_storage_t *str_tree_storage;
- re_bitset_ptr_t sb_char;
- int str_tree_storage_idx;
-
- /* number of subexpressions `re_nsub' is in regex_t. */
- unsigned int state_hash_mask;
- int init_node;
- int nbackref; /* The number of backreference in this dfa. */
-
- /* Bitmap expressing which backreference is used. */
- bitset_word_t used_bkref_map;
- bitset_word_t completed_bkref_map;
-
- unsigned int has_plural_match : 1;
- /* If this dfa has "multibyte node", which is a backreference or
- a node which can accept multibyte character or multi character
- collating element. */
- unsigned int has_mb_node : 1;
- unsigned int is_utf8 : 1;
- unsigned int map_notascii : 1;
- unsigned int word_ops_used : 1;
- int mb_cur_max;
- bitset_t word_char;
- reg_syntax_t syntax;
- int *subexp_map;
-#ifdef DEBUG
- char* re_str;
-#endif
- __libc_lock_define (, lock)
-};
-
-#define re_node_set_init_empty(set) memset (set, '\0', sizeof (re_node_set))
-#define re_node_set_remove(set,id) \
- (re_node_set_remove_at (set, re_node_set_contains (set, id) - 1))
-#define re_node_set_empty(p) ((p)->nelem = 0)
-#define re_node_set_free(set) re_free ((set)->elems)
-
-
-typedef enum
-{
- SB_CHAR,
- MB_CHAR,
- EQUIV_CLASS,
- COLL_SYM,
- CHAR_CLASS
-} bracket_elem_type;
-
-typedef struct
-{
- bracket_elem_type type;
- union
- {
- unsigned char ch;
- unsigned char *name;
- wchar_t wch;
- } opr;
-} bracket_elem_t;
-
-
-/* Inline functions for bitset operation. */
-static inline void
-bitset_not (bitset_t set)
-{
- int bitset_i;
- for (bitset_i = 0; bitset_i < BITSET_WORDS; ++bitset_i)
- set[bitset_i] = ~set[bitset_i];
-}
-
-static inline void
-bitset_merge (bitset_t dest, const bitset_t src)
-{
- int bitset_i;
- for (bitset_i = 0; bitset_i < BITSET_WORDS; ++bitset_i)
- dest[bitset_i] |= src[bitset_i];
-}
-
-static inline void
-bitset_mask (bitset_t dest, const bitset_t src)
-{
- int bitset_i;
- for (bitset_i = 0; bitset_i < BITSET_WORDS; ++bitset_i)
- dest[bitset_i] &= src[bitset_i];
-}
-
-#ifdef RE_ENABLE_I18N
-/* Inline functions for re_string. */
-static inline int
-internal_function __attribute ((pure))
-re_string_char_size_at (const re_string_t *pstr, int idx)
-{
- int byte_idx;
- if (pstr->mb_cur_max == 1)
- return 1;
- for (byte_idx = 1; idx + byte_idx < pstr->valid_len; ++byte_idx)
- if (pstr->wcs[idx + byte_idx] != WEOF)
- break;
- return byte_idx;
-}
-
-static inline wint_t
-internal_function __attribute ((pure))
-re_string_wchar_at (const re_string_t *pstr, int idx)
-{
- if (pstr->mb_cur_max == 1)
- return (wint_t) pstr->mbs[idx];
- return (wint_t) pstr->wcs[idx];
-}
-
-# ifndef NOT_IN_libc
-static int
-internal_function __attribute ((pure))
-re_string_elem_size_at (const re_string_t *pstr, int idx)
-{
-# ifdef _LIBC
- const unsigned char *p, *extra;
- const int32_t *table, *indirect;
- int32_t tmp;
-# include <locale/weight.h>
- uint_fast32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
-
- if (nrules != 0)
- {
- table = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB);
- extra = (const unsigned char *)
- _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB);
- indirect = (const int32_t *) _NL_CURRENT (LC_COLLATE,
- _NL_COLLATE_INDIRECTMB);
- p = pstr->mbs + idx;
- tmp = findidx (&p);
- return p - pstr->mbs - idx;
- }
- else
-# endif /* _LIBC */
- return 1;
-}
-# endif
-#endif /* RE_ENABLE_I18N */
-
-#endif /* _REGEX_INTERNAL_H */
Deleted: trunk/src/utilfuns/regexec.c
===================================================================
--- trunk/src/utilfuns/regexec.c 2009-12-07 04:02:43 UTC (rev 2486)
+++ trunk/src/utilfuns/regexec.c 2009-12-08 07:18:00 UTC (rev 2487)
@@ -1,4338 +0,0 @@
-/* Extended regular expression matching and search library.
- Copyright (C) 2002, 2003, 2004, 2005, 2007, 2009 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Isamu Hasegawa <isamu at yamato.ibm.com>.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-static reg_errcode_t match_ctx_init (re_match_context_t *cache, int eflags,
- int n) internal_function;
-static void match_ctx_clean (re_match_context_t *mctx) internal_function;
-static void match_ctx_free (re_match_context_t *cache) internal_function;
-static reg_errcode_t match_ctx_add_entry (re_match_context_t *cache, int node,
- int str_idx, int from, int to)
- internal_function;
-static int search_cur_bkref_entry (const re_match_context_t *mctx, int str_idx)
- internal_function;
-static reg_errcode_t match_ctx_add_subtop (re_match_context_t *mctx, int node,
- int str_idx) internal_function;
-static re_sub_match_last_t * match_ctx_add_sublast (re_sub_match_top_t *subtop,
- int node, int str_idx)
- internal_function;
-static void sift_ctx_init (re_sift_context_t *sctx, re_dfastate_t **sifted_sts,
- re_dfastate_t **limited_sts, int last_node,
- int last_str_idx)
- internal_function;
-static reg_errcode_t re_search_internal (const regex_t *preg,
- const char *string, int length,
- int start, int range, int stop,
- size_t nmatch, regmatch_t pmatch[],
- int eflags) internal_function;
-static int re_search_2_stub (struct re_pattern_buffer *bufp,
- const char *string1, int length1,
- const char *string2, int length2,
- int start, int range, struct re_registers *regs,
- int stop, int ret_len) internal_function;
-static int re_search_stub (struct re_pattern_buffer *bufp,
- const char *string, int length, int start,
- int range, int stop, struct re_registers *regs,
- int ret_len) internal_function;
-static unsigned re_copy_regs (struct re_registers *regs, regmatch_t *pmatch,
- int nregs, int regs_allocated) internal_function;
-static reg_errcode_t prune_impossible_nodes (re_match_context_t *mctx)
- internal_function;
-static int check_matching (re_match_context_t *mctx, int fl_longest_match,
- int *p_match_first) internal_function;
-static int check_halt_state_context (const re_match_context_t *mctx,
- const re_dfastate_t *state, int idx)
- internal_function;
-static void update_regs (const re_dfa_t *dfa, regmatch_t *pmatch,
- regmatch_t *prev_idx_match, int cur_node,
- int cur_idx, int nmatch) internal_function;
-static reg_errcode_t push_fail_stack (struct re_fail_stack_t *fs,
- int str_idx, int dest_node, int nregs,
- regmatch_t *regs,
- re_node_set *eps_via_nodes)
- internal_function;
-static reg_errcode_t set_regs (const regex_t *preg,
- const re_match_context_t *mctx,
- size_t nmatch, regmatch_t *pmatch,
- int fl_backtrack) internal_function;
-static reg_errcode_t free_fail_stack_return (struct re_fail_stack_t *fs)
- internal_function;
-
-#ifdef RE_ENABLE_I18N
-static int sift_states_iter_mb (const re_match_context_t *mctx,
- re_sift_context_t *sctx,
- int node_idx, int str_idx, int max_str_idx)
- internal_function;
-#endif /* RE_ENABLE_I18N */
-static reg_errcode_t sift_states_backward (const re_match_context_t *mctx,
- re_sift_context_t *sctx)
- internal_function;
-static reg_errcode_t build_sifted_states (const re_match_context_t *mctx,
- re_sift_context_t *sctx, int str_idx,
- re_node_set *cur_dest)
- internal_function;
-static reg_errcode_t update_cur_sifted_state (const re_match_context_t *mctx,
- re_sift_context_t *sctx,
- int str_idx,
- re_node_set *dest_nodes)
- internal_function;
-static reg_errcode_t add_epsilon_src_nodes (const re_dfa_t *dfa,
- re_node_set *dest_nodes,
- const re_node_set *candidates)
- internal_function;
-static int check_dst_limits (const re_match_context_t *mctx,
- re_node_set *limits,
- int dst_node, int dst_idx, int src_node,
- int src_idx) internal_function;
-static int check_dst_limits_calc_pos_1 (const re_match_context_t *mctx,
- int boundaries, int subexp_idx,
- int from_node, int bkref_idx)
- internal_function;
-static int check_dst_limits_calc_pos (const re_match_context_t *mctx,
- int limit, int subexp_idx,
- int node, int str_idx,
- int bkref_idx) internal_function;
-static reg_errcode_t check_subexp_limits (const re_dfa_t *dfa,
- re_node_set *dest_nodes,
- const re_node_set *candidates,
- re_node_set *limits,
- struct re_backref_cache_entry *bkref_ents,
- int str_idx) internal_function;
-static reg_errcode_t sift_states_bkref (const re_match_context_t *mctx,
- re_sift_context_t *sctx,
- int str_idx, const re_node_set *candidates)
- internal_function;
-static reg_errcode_t merge_state_array (const re_dfa_t *dfa,
- re_dfastate_t **dst,
- re_dfastate_t **src, int num)
- internal_function;
-static re_dfastate_t *find_recover_state (reg_errcode_t *err,
- re_match_context_t *mctx) internal_function;
-static re_dfastate_t *transit_state (reg_errcode_t *err,
- re_match_context_t *mctx,
- re_dfastate_t *state) internal_function;
-static re_dfastate_t *merge_state_with_log (reg_errcode_t *err,
- re_match_context_t *mctx,
- re_dfastate_t *next_state)
- internal_function;
-static reg_errcode_t check_subexp_matching_top (re_match_context_t *mctx,
- re_node_set *cur_nodes,
- int str_idx) internal_function;
-#if 0
-static re_dfastate_t *transit_state_sb (reg_errcode_t *err,
- re_match_context_t *mctx,
- re_dfastate_t *pstate)
- internal_function;
-#endif
-#ifdef RE_ENABLE_I18N
-static reg_errcode_t transit_state_mb (re_match_context_t *mctx,
- re_dfastate_t *pstate)
- internal_function;
-#endif /* RE_ENABLE_I18N */
-static reg_errcode_t transit_state_bkref (re_match_context_t *mctx,
- const re_node_set *nodes)
- internal_function;
-static reg_errcode_t get_subexp (re_match_context_t *mctx,
- int bkref_node, int bkref_str_idx)
- internal_function;
-static reg_errcode_t get_subexp_sub (re_match_context_t *mctx,
- const re_sub_match_top_t *sub_top,
- re_sub_match_last_t *sub_last,
- int bkref_node, int bkref_str)
- internal_function;
-static int find_subexp_node (const re_dfa_t *dfa, const re_node_set *nodes,
- int subexp_idx, int type) internal_function;
-static reg_errcode_t check_arrival (re_match_context_t *mctx,
- state_array_t *path, int top_node,
- int top_str, int last_node, int last_str,
- int type) internal_function;
-static reg_errcode_t check_arrival_add_next_nodes (re_match_context_t *mctx,
- int str_idx,
- re_node_set *cur_nodes,
- re_node_set *next_nodes)
- internal_function;
-static reg_errcode_t check_arrival_expand_ecl (const re_dfa_t *dfa,
- re_node_set *cur_nodes,
- int ex_subexp, int type)
- internal_function;
-static reg_errcode_t check_arrival_expand_ecl_sub (const re_dfa_t *dfa,
- re_node_set *dst_nodes,
- int target, int ex_subexp,
- int type) internal_function;
-static reg_errcode_t expand_bkref_cache (re_match_context_t *mctx,
- re_node_set *cur_nodes, int cur_str,
- int subexp_num, int type)
- internal_function;
-static int build_trtable (const re_dfa_t *dfa,
- re_dfastate_t *state) internal_function;
-#ifdef RE_ENABLE_I18N
-static int check_node_accept_bytes (const re_dfa_t *dfa, int node_idx,
- const re_string_t *input, int idx)
- internal_function;
-# ifdef _LIBC
-static unsigned int find_collation_sequence_value (const unsigned char *mbs,
- size_t name_len)
- internal_function;
-# endif /* _LIBC */
-#endif /* RE_ENABLE_I18N */
-static int group_nodes_into_DFAstates (const re_dfa_t *dfa,
- const re_dfastate_t *state,
- re_node_set *states_node,
- bitset_t *states_ch) internal_function;
-static int check_node_accept (const re_match_context_t *mctx,
- const re_token_t *node, int idx)
- internal_function;
-static reg_errcode_t extend_buffers (re_match_context_t *mctx)
- internal_function;
-
-/* Entry point for POSIX code. */
-
-/* regexec searches for a given pattern, specified by PREG, in the
- string STRING.
-
- If NMATCH is zero or REG_NOSUB was set in the cflags argument to
- `regcomp', we ignore PMATCH. Otherwise, we assume PMATCH has at
- least NMATCH elements, and we set them to the offsets of the
- corresponding matched substrings.
-
- EFLAGS specifies `execution flags' which affect matching: if
- REG_NOTBOL is set, then ^ does not match at the beginning of the
- string; if REG_NOTEOL is set, then $ does not match at the end.
-
- We return 0 if we find a match and REG_NOMATCH if not. */
-
-int
-regexec (preg, string, nmatch, pmatch, eflags)
- const regex_t *__restrict preg;
- const char *__restrict string;
- size_t nmatch;
- regmatch_t pmatch[];
- int eflags;
-{
- reg_errcode_t err;
- int start, length;
- re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
-
- if (eflags & ~(REG_NOTBOL | REG_NOTEOL | REG_STARTEND))
- return REG_BADPAT;
-
- if (eflags & REG_STARTEND)
- {
- start = pmatch[0].rm_so;
- length = pmatch[0].rm_eo;
- }
- else
- {
- start = 0;
- length = strlen (string);
- }
-
- __libc_lock_lock (dfa->lock);
- if (preg->no_sub)
- err = re_search_internal (preg, string, length, start, length - start,
- length, 0, NULL, eflags);
- else
- err = re_search_internal (preg, string, length, start, length - start,
- length, nmatch, pmatch, eflags);
- __libc_lock_unlock (dfa->lock);
- return err != REG_NOERROR;
-}
-
-#ifdef _LIBC
-# include <shlib-compat.h>
-versioned_symbol (libc, __regexec, regexec, GLIBC_2_3_4);
-
-# if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_3_4)
-__typeof__ (__regexec) __compat_regexec;
-
-int
-attribute_compat_text_section
-__compat_regexec (const regex_t *__restrict preg,
- const char *__restrict string, size_t nmatch,
- regmatch_t pmatch[], int eflags)
-{
- return regexec (preg, string, nmatch, pmatch,
- eflags & (REG_NOTBOL | REG_NOTEOL));
-}
-compat_symbol (libc, __compat_regexec, regexec, GLIBC_2_0);
-# endif
-#endif
-
-/* Entry points for GNU code. */
-
-/* re_match, re_search, re_match_2, re_search_2
-
- The former two functions operate on STRING with length LENGTH,
- while the later two operate on concatenation of STRING1 and STRING2
- with lengths LENGTH1 and LENGTH2, respectively.
-
- re_match() matches the compiled pattern in BUFP against the string,
- starting at index START.
-
- re_search() first tries matching at index START, then it tries to match
- starting from index START + 1, and so on. The last start position tried
- is START + RANGE. (Thus RANGE = 0 forces re_search to operate the same
- way as re_match().)
-
- The parameter STOP of re_{match,search}_2 specifies that no match exceeding
- the first STOP characters of the concatenation of the strings should be
- concerned.
-
- If REGS is not NULL, and BUFP->no_sub is not set, the offsets of the match
- and all groups is stroed in REGS. (For the "_2" variants, the offsets are
- computed relative to the concatenation, not relative to the individual
- strings.)
-
- On success, re_match* functions return the length of the match, re_search*
- return the position of the start of the match. Return value -1 means no
- match was found and -2 indicates an internal error. */
-
-int
-re_match (bufp, string, length, start, regs)
- struct re_pattern_buffer *bufp;
- const char *string;
- int length, start;
- struct re_registers *regs;
-{
- return re_search_stub (bufp, string, length, start, 0, length, regs, 1);
-}
-#ifdef _LIBC
-weak_alias (__re_match, re_match)
-#endif
-
-int
-re_search (bufp, string, length, start, range, regs)
- struct re_pattern_buffer *bufp;
- const char *string;
- int length, start, range;
- struct re_registers *regs;
-{
- return re_search_stub (bufp, string, length, start, range, length, regs, 0);
-}
-#ifdef _LIBC
-weak_alias (__re_search, re_search)
-#endif
-
-int
-re_match_2 (bufp, string1, length1, string2, length2, start, regs, stop)
- struct re_pattern_buffer *bufp;
- const char *string1, *string2;
- int length1, length2, start, stop;
- struct re_registers *regs;
-{
- return re_search_2_stub (bufp, string1, length1, string2, length2,
- start, 0, regs, stop, 1);
-}
-#ifdef _LIBC
-weak_alias (__re_match_2, re_match_2)
-#endif
-
-int
-re_search_2 (bufp, string1, length1, string2, length2, start, range, regs, stop)
- struct re_pattern_buffer *bufp;
- const char *string1, *string2;
- int length1, length2, start, range, stop;
- struct re_registers *regs;
-{
- return re_search_2_stub (bufp, string1, length1, string2, length2,
- start, range, regs, stop, 0);
-}
-#ifdef _LIBC
-weak_alias (__re_search_2, re_search_2)
-#endif
-
-static int
-re_search_2_stub (bufp, string1, length1, string2, length2, start, range, regs,
- stop, ret_len)
- struct re_pattern_buffer *bufp;
- const char *string1, *string2;
- int length1, length2, start, range, stop, ret_len;
- struct re_registers *regs;
-{
- const char *str;
- int rval;
- int len = length1 + length2;
- int free_str = 0;
-
- if (BE (length1 < 0 || length2 < 0 || stop < 0, 0))
- return -2;
-
- /* Concatenate the strings. */
- if (length2 > 0)
- if (length1 > 0)
- {
- char *s = re_malloc (char, len);
-
- if (BE (s == NULL, 0))
- return -2;
-#ifdef _LIBC
- memcpy (__mempcpy (s, string1, length1), string2, length2);
-#else
- memcpy (s, string1, length1);
- memcpy (s + length1, string2, length2);
-#endif
- str = s;
- free_str = 1;
- }
- else
- str = string2;
- else
- str = string1;
-
- rval = re_search_stub (bufp, str, len, start, range, stop, regs,
- ret_len);
- if (free_str)
- re_free ((char *) str);
- return rval;
-}
-
-/* The parameters have the same meaning as those of re_search.
- Additional parameters:
- If RET_LEN is nonzero the length of the match is returned (re_match style);
- otherwise the position of the match is returned. */
-
-static int
-re_search_stub (bufp, string, length, start, range, stop, regs, ret_len)
- struct re_pattern_buffer *bufp;
- const char *string;
- int length, start, range, stop, ret_len;
- struct re_registers *regs;
-{
- reg_errcode_t result;
- regmatch_t *pmatch;
- int nregs, rval;
- int eflags = 0;
- re_dfa_t *dfa = (re_dfa_t *) bufp->buffer;
-
- /* Check for out-of-range. */
- if (BE (start < 0 || start > length, 0))
- return -1;
- if (BE (start + range > length, 0))
- range = length - start;
- else if (BE (start + range < 0, 0))
- range = -start;
-
- __libc_lock_lock (dfa->lock);
-
- eflags |= (bufp->not_bol) ? REG_NOTBOL : 0;
- eflags |= (bufp->not_eol) ? REG_NOTEOL : 0;
-
- /* Compile fastmap if we haven't yet. */
- if (range > 0 && bufp->fastmap != NULL && !bufp->fastmap_accurate)
- re_compile_fastmap (bufp);
-
- if (BE (bufp->no_sub, 0))
- regs = NULL;
-
- /* We need at least 1 register. */
- if (regs == NULL)
- nregs = 1;
- else if (BE (bufp->regs_allocated == REGS_FIXED &&
- regs->num_regs < bufp->re_nsub + 1, 0))
- {
- nregs = regs->num_regs;
- if (BE (nregs < 1, 0))
- {
- /* Nothing can be copied to regs. */
- regs = NULL;
- nregs = 1;
- }
- }
- else
- nregs = bufp->re_nsub + 1;
- pmatch = re_malloc (regmatch_t, nregs);
- if (BE (pmatch == NULL, 0))
- {
- rval = -2;
- goto out;
- }
-
- result = re_search_internal (bufp, string, length, start, range, stop,
- nregs, pmatch, eflags);
-
- rval = 0;
-
- /* I hope we needn't fill ther regs with -1's when no match was found. */
- if (result != REG_NOERROR)
- rval = -1;
- else if (regs != NULL)
- {
- /* If caller wants register contents data back, copy them. */
- bufp->regs_allocated = re_copy_regs (regs, pmatch, nregs,
- bufp->regs_allocated);
- if (BE (bufp->regs_allocated == REGS_UNALLOCATED, 0))
- rval = -2;
- }
-
- if (BE (rval == 0, 1))
- {
- if (ret_len)
- {
- assert (pmatch[0].rm_so == start);
- rval = pmatch[0].rm_eo - start;
- }
- else
- rval = pmatch[0].rm_so;
- }
- re_free (pmatch);
- out:
- __libc_lock_unlock (dfa->lock);
- return rval;
-}
-
-static unsigned
-re_copy_regs (regs, pmatch, nregs, regs_allocated)
- struct re_registers *regs;
- regmatch_t *pmatch;
- int nregs, regs_allocated;
-{
- int rval = REGS_REALLOCATE;
- int i;
- int need_regs = nregs + 1;
- /* We need one extra element beyond `num_regs' for the `-1' marker GNU code
- uses. */
-
- /* Have the register data arrays been allocated? */
- if (regs_allocated == REGS_UNALLOCATED)
- { /* No. So allocate them with malloc. */
- regs->start = re_malloc (regoff_t, need_regs);
- regs->end = re_malloc (regoff_t, need_regs);
- if (BE (regs->start == NULL, 0) || BE (regs->end == NULL, 0))
- return REGS_UNALLOCATED;
- regs->num_regs = need_regs;
- }
- else if (regs_allocated == REGS_REALLOCATE)
- { /* Yes. If we need more elements than were already
- allocated, reallocate them. If we need fewer, just
- leave it alone. */
- if (BE (need_regs > regs->num_regs, 0))
- {
- regoff_t *new_start = re_realloc (regs->start, regoff_t, need_regs);
- regoff_t *new_end = re_realloc (regs->end, regoff_t, need_regs);
- if (BE (new_start == NULL, 0) || BE (new_end == NULL, 0))
- return REGS_UNALLOCATED;
- regs->start = new_start;
- regs->end = new_end;
- regs->num_regs = need_regs;
- }
- }
- else
- {
- assert (regs_allocated == REGS_FIXED);
- /* This function may not be called with REGS_FIXED and nregs too big. */
- assert (regs->num_regs >= nregs);
- rval = REGS_FIXED;
- }
-
- /* Copy the regs. */
- for (i = 0; i < nregs; ++i)
- {
- regs->start[i] = pmatch[i].rm_so;
- regs->end[i] = pmatch[i].rm_eo;
- }
- for ( ; i < regs->num_regs; ++i)
- regs->start[i] = regs->end[i] = -1;
-
- return rval;
-}
-
-/* Set REGS to hold NUM_REGS registers, storing them in STARTS and
- ENDS. Subsequent matches using PATTERN_BUFFER and REGS will use
- this memory for recording register information. STARTS and ENDS
- must be allocated using the malloc library routine, and must each
- be at least NUM_REGS * sizeof (regoff_t) bytes long.
-
- If NUM_REGS == 0, then subsequent matches should allocate their own
- register data.
-
- Unless this function is called, the first search or match using
- PATTERN_BUFFER will allocate its own register data, without
- freeing the old data. */
-
-void
-re_set_registers (bufp, regs, num_regs, starts, ends)
- struct re_pattern_buffer *bufp;
- struct re_registers *regs;
- unsigned num_regs;
- regoff_t *starts, *ends;
-{
- if (num_regs)
- {
- bufp->regs_allocated = REGS_REALLOCATE;
- regs->num_regs = num_regs;
- regs->start = starts;
- regs->end = ends;
- }
- else
- {
- bufp->regs_allocated = REGS_UNALLOCATED;
- regs->num_regs = 0;
- regs->start = regs->end = (regoff_t *) 0;
- }
-}
-#ifdef _LIBC
-weak_alias (__re_set_registers, re_set_registers)
-#endif
-
-/* Entry points compatible with 4.2 BSD regex library. We don't define
- them unless specifically requested. */
-
-#if defined _REGEX_RE_COMP || defined _LIBC
-int
-# ifdef _LIBC
-weak_function
-# endif
-re_exec (s)
- const char *s;
-{
- return 0 == regexec (&re_comp_buf, s, 0, NULL, 0);
-}
-#endif /* _REGEX_RE_COMP */
-
-/* Internal entry point. */
-
-/* Searches for a compiled pattern PREG in the string STRING, whose
- length is LENGTH. NMATCH, PMATCH, and EFLAGS have the same
- mingings with regexec. START, and RANGE have the same meanings
- with re_search.
- Return REG_NOERROR if we find a match, and REG_NOMATCH if not,
- otherwise return the error code.
- Note: We assume front end functions already check ranges.
- (START + RANGE >= 0 && START + RANGE <= LENGTH) */
-
-static reg_errcode_t
-re_search_internal (preg, string, length, start, range, stop, nmatch, pmatch,
- eflags)
- const regex_t *preg;
- const char *string;
- int length, start, range, stop, eflags;
- size_t nmatch;
- regmatch_t pmatch[];
-{
- reg_errcode_t err;
- const re_dfa_t *dfa = (const re_dfa_t *) preg->buffer;
- int left_lim, right_lim, incr;
- int fl_longest_match, match_first, match_kind, match_last = -1;
- int extra_nmatch;
- int sb, ch;
-#if defined _LIBC || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
- re_match_context_t mctx = { .dfa = dfa };
-#else
- re_match_context_t mctx;
-#endif
- char *fastmap = (preg->fastmap != NULL && preg->fastmap_accurate
- && range && !preg->can_be_null) ? preg->fastmap : NULL;
- RE_TRANSLATE_TYPE t = preg->translate;
-
-#if !(defined _LIBC || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
- memset (&mctx, '\0', sizeof (re_match_context_t));
- mctx.dfa = dfa;
-#endif
-
- extra_nmatch = (nmatch > preg->re_nsub) ? nmatch - (preg->re_nsub + 1) : 0;
- nmatch -= extra_nmatch;
-
- /* Check if the DFA haven't been compiled. */
- if (BE (preg->used == 0 || dfa->init_state == NULL
- || dfa->init_state_word == NULL || dfa->init_state_nl == NULL
- || dfa->init_state_begbuf == NULL, 0))
- return REG_NOMATCH;
-
-#ifdef DEBUG
- /* We assume front-end functions already check them. */
- assert (start + range >= 0 && start + range <= length);
-#endif
-
- /* If initial states with non-begbuf contexts have no elements,
- the regex must be anchored. If preg->newline_anchor is set,
- we'll never use init_state_nl, so do not check it. */
- if (dfa->init_state->nodes.nelem == 0
- && dfa->init_state_word->nodes.nelem == 0
- && (dfa->init_state_nl->nodes.nelem == 0
- || !preg->newline_anchor))
- {
- if (start != 0 && start + range != 0)
- return REG_NOMATCH;
- start = range = 0;
- }
-
- /* We must check the longest matching, if nmatch > 0. */
- fl_longest_match = (nmatch != 0 || dfa->nbackref);
-
- err = re_string_allocate (&mctx.input, string, length, dfa->nodes_len + 1,
- preg->translate, preg->syntax & RE_ICASE, dfa);
- if (BE (err != REG_NOERROR, 0))
- goto free_return;
- mctx.input.stop = stop;
- mctx.input.raw_stop = stop;
- mctx.input.newline_anchor = preg->newline_anchor;
-
- err = match_ctx_init (&mctx, eflags, dfa->nbackref * 2);
- if (BE (err != REG_NOERROR, 0))
- goto free_return;
-
- /* We will log all the DFA states through which the dfa pass,
- if nmatch > 1, or this dfa has "multibyte node", which is a
- back-reference or a node which can accept multibyte character or
- multi character collating element. */
- if (nmatch > 1 || dfa->has_mb_node)
- {
- mctx.state_log = re_malloc (re_dfastate_t *, mctx.input.bufs_len + 1);
- if (BE (mctx.state_log == NULL, 0))
- {
- err = REG_ESPACE;
- goto free_return;
- }
- }
- else
- mctx.state_log = NULL;
-
- match_first = start;
- mctx.input.tip_context = (eflags & REG_NOTBOL) ? CONTEXT_BEGBUF
- : CONTEXT_NEWLINE | CONTEXT_BEGBUF;
-
- /* Check incrementally whether of not the input string match. */
- incr = (range < 0) ? -1 : 1;
- left_lim = (range < 0) ? start + range : start;
- right_lim = (range < 0) ? start : start + range;
- sb = dfa->mb_cur_max == 1;
- match_kind =
- (fastmap
- ? ((sb || !(preg->syntax & RE_ICASE || t) ? 4 : 0)
- | (range >= 0 ? 2 : 0)
- | (t != NULL ? 1 : 0))
- : 8);
-
- for (;; match_first += incr)
- {
- err = REG_NOMATCH;
- if (match_first < left_lim || right_lim < match_first)
- goto free_return;
-
- /* Advance as rapidly as possible through the string, until we
- find a plausible place to start matching. This may be done
- with varying efficiency, so there are various possibilities:
- only the most common of them are specialized, in order to
- save on code size. We use a switch statement for speed. */
- switch (match_kind)
- {
- case 8:
- /* No fastmap. */
- break;
-
- case 7:
- /* Fastmap with single-byte translation, match forward. */
- while (BE (match_first < right_lim, 1)
- && !fastmap[t[(unsigned char) string[match_first]]])
- ++match_first;
- goto forward_match_found_start_or_reached_end;
-
- case 6:
- /* Fastmap without translation, match forward. */
- while (BE (match_first < right_lim, 1)
- && !fastmap[(unsigned char) string[match_first]])
- ++match_first;
-
- forward_match_found_start_or_reached_end:
- if (BE (match_first == right_lim, 0))
- {
- ch = match_first >= length
- ? 0 : (unsigned char) string[match_first];
- if (!fastmap[t ? t[ch] : ch])
- goto free_return;
- }
- break;
-
- case 4:
- case 5:
- /* Fastmap without multi-byte translation, match backwards. */
- while (match_first >= left_lim)
- {
- ch = match_first >= length
- ? 0 : (unsigned char) string[match_first];
- if (fastmap[t ? t[ch] : ch])
- break;
- --match_first;
- }
- if (match_first < left_lim)
- goto free_return;
- break;
-
- default:
- /* In this case, we can't determine easily the current byte,
- since it might be a component byte of a multibyte
- character. Then we use the constructed buffer instead. */
- for (;;)
- {
- /* If MATCH_FIRST is out of the valid range, reconstruct the
- buffers. */
- unsigned int offset = match_first - mctx.input.raw_mbs_idx;
- if (BE (offset >= (unsigned int) mctx.input.valid_raw_len, 0))
- {
- err = re_string_reconstruct (&mctx.input, match_first,
- eflags);
- if (BE (err != REG_NOERROR, 0))
- goto free_return;
-
- offset = match_first - mctx.input.raw_mbs_idx;
- }
- /* If MATCH_FIRST is out of the buffer, leave it as '\0'.
- Note that MATCH_FIRST must not be smaller than 0. */
- ch = (match_first >= length
- ? 0 : re_string_byte_at (&mctx.input, offset));
- if (fastmap[ch])
- break;
- match_first += incr;
- if (match_first < left_lim || match_first > right_lim)
- {
- err = REG_NOMATCH;
- goto free_return;
- }
- }
- break;
- }
-
- /* Reconstruct the buffers so that the matcher can assume that
- the matching starts from the beginning of the buffer. */
- err = re_string_reconstruct (&mctx.input, match_first, eflags);
- if (BE (err != REG_NOERROR, 0))
- goto free_return;
-
-#ifdef RE_ENABLE_I18N
- /* Don't consider this char as a possible match start if it part,
- yet isn't the head, of a multibyte character. */
- if (!sb && !re_string_first_byte (&mctx.input, 0))
- continue;
-#endif
-
- /* It seems to be appropriate one, then use the matcher. */
- /* We assume that the matching starts from 0. */
- mctx.state_log_top = mctx.nbkref_ents = mctx.max_mb_elem_len = 0;
- match_last = check_matching (&mctx, fl_longest_match,
- range >= 0 ? &match_first : NULL);
- if (match_last != -1)
- {
- if (BE (match_last == -2, 0))
- {
- err = REG_ESPACE;
- goto free_return;
- }
- else
- {
- mctx.match_last = match_last;
- if ((!preg->no_sub && nmatch > 1) || dfa->nbackref)
- {
- re_dfastate_t *pstate = mctx.state_log[match_last];
- mctx.last_node = check_halt_state_context (&mctx, pstate,
- match_last);
- }
- if ((!preg->no_sub && nmatch > 1 && dfa->has_plural_match)
- || dfa->nbackref)
- {
- err = prune_impossible_nodes (&mctx);
- if (err == REG_NOERROR)
- break;
- if (BE (err != REG_NOMATCH, 0))
- goto free_return;
- match_last = -1;
- }
- else
- break; /* We found a match. */
- }
- }
-
- match_ctx_clean (&mctx);
- }
-
-#ifdef DEBUG
- assert (match_last != -1);
- assert (err == REG_NOERROR);
-#endif
-
- /* Set pmatch[] if we need. */
- if (nmatch > 0)
- {
- int reg_idx;
-
- /* Initialize registers. */
- for (reg_idx = 1; reg_idx < nmatch; ++reg_idx)
- pmatch[reg_idx].rm_so = pmatch[reg_idx].rm_eo = -1;
-
- /* Set the points where matching start/end. */
- pmatch[0].rm_so = 0;
- pmatch[0].rm_eo = mctx.match_last;
-
- if (!preg->no_sub && nmatch > 1)
- {
- err = set_regs (preg, &mctx, nmatch, pmatch,
- dfa->has_plural_match && dfa->nbackref > 0);
- if (BE (err != REG_NOERROR, 0))
- goto free_return;
- }
-
- /* At last, add the offset to the each registers, since we slided
- the buffers so that we could assume that the matching starts
- from 0. */
- for (reg_idx = 0; reg_idx < nmatch; ++reg_idx)
- if (pmatch[reg_idx].rm_so != -1)
- {
-#ifdef RE_ENABLE_I18N
- if (BE (mctx.input.offsets_needed != 0, 0))
- {
- pmatch[reg_idx].rm_so =
- (pmatch[reg_idx].rm_so == mctx.input.valid_len
- ? mctx.input.valid_raw_len
- : mctx.input.offsets[pmatch[reg_idx].rm_so]);
- pmatch[reg_idx].rm_eo =
- (pmatch[reg_idx].rm_eo == mctx.input.valid_len
- ? mctx.input.valid_raw_len
- : mctx.input.offsets[pmatch[reg_idx].rm_eo]);
- }
-#else
- assert (mctx.input.offsets_needed == 0);
-#endif
- pmatch[reg_idx].rm_so += match_first;
- pmatch[reg_idx].rm_eo += match_first;
- }
- for (reg_idx = 0; reg_idx < extra_nmatch; ++reg_idx)
- {
- pmatch[nmatch + reg_idx].rm_so = -1;
- pmatch[nmatch + reg_idx].rm_eo = -1;
- }
-
- if (dfa->subexp_map)
- for (reg_idx = 0; reg_idx + 1 < nmatch; reg_idx++)
- if (dfa->subexp_map[reg_idx] != reg_idx)
- {
- pmatch[reg_idx + 1].rm_so
- = pmatch[dfa->subexp_map[reg_idx] + 1].rm_so;
- pmatch[reg_idx + 1].rm_eo
- = pmatch[dfa->subexp_map[reg_idx] + 1].rm_eo;
- }
- }
-
- free_return:
- re_free (mctx.state_log);
- if (dfa->nbackref)
- match_ctx_free (&mctx);
- re_string_destruct (&mctx.input);
- return err;
-}
-
-static reg_errcode_t
-prune_impossible_nodes (mctx)
- re_match_context_t *mctx;
-{
- const re_dfa_t *const dfa = mctx->dfa;
- int halt_node, match_last;
- reg_errcode_t ret;
- re_dfastate_t **sifted_states;
- re_dfastate_t **lim_states = NULL;
- re_sift_context_t sctx;
-#ifdef DEBUG
- assert (mctx->state_log != NULL);
-#endif
- match_last = mctx->match_last;
- halt_node = mctx->last_node;
- sifted_states = re_malloc (re_dfastate_t *, match_last + 1);
- if (BE (sifted_states == NULL, 0))
- {
- ret = REG_ESPACE;
- goto free_return;
- }
- if (dfa->nbackref)
- {
- lim_states = re_malloc (re_dfastate_t *, match_last + 1);
- if (BE (lim_states == NULL, 0))
- {
- ret = REG_ESPACE;
- goto free_return;
- }
- while (1)
- {
- memset (lim_states, '\0',
- sizeof (re_dfastate_t *) * (match_last + 1));
- sift_ctx_init (&sctx, sifted_states, lim_states, halt_node,
- match_last);
- ret = sift_states_backward (mctx, &sctx);
- re_node_set_free (&sctx.limits);
- if (BE (ret != REG_NOERROR, 0))
- goto free_return;
- if (sifted_states[0] != NULL || lim_states[0] != NULL)
- break;
- do
- {
- --match_last;
- if (match_last < 0)
- {
- ret = REG_NOMATCH;
- goto free_return;
- }
- } while (mctx->state_log[match_last] == NULL
- || !mctx->state_log[match_last]->halt);
- halt_node = check_halt_state_context (mctx,
- mctx->state_log[match_last],
- match_last);
- }
- ret = merge_state_array (dfa, sifted_states, lim_states,
- match_last + 1);
- re_free (lim_states);
- lim_states = NULL;
- if (BE (ret != REG_NOERROR, 0))
- goto free_return;
- }
- else
- {
- sift_ctx_init (&sctx, sifted_states, lim_states, halt_node, match_last);
- ret = sift_states_backward (mctx, &sctx);
- re_node_set_free (&sctx.limits);
- if (BE (ret != REG_NOERROR, 0))
- goto free_return;
- if (sifted_states[0] == NULL)
- {
- ret = REG_NOMATCH;
- goto free_return;
- }
- }
- re_free (mctx->state_log);
- mctx->state_log = sifted_states;
- sifted_states = NULL;
- mctx->last_node = halt_node;
- mctx->match_last = match_last;
- ret = REG_NOERROR;
- free_return:
- re_free (sifted_states);
- re_free (lim_states);
- return ret;
-}
-
-/* Acquire an initial state and return it.
- We must select appropriate initial state depending on the context,
- since initial states may have constraints like "\<", "^", etc.. */
-
-static inline re_dfastate_t *
-__attribute ((always_inline)) internal_function
-acquire_init_state_context (reg_errcode_t *err, const re_match_context_t *mctx,
- int idx)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- if (dfa->init_state->has_constraint)
- {
- unsigned int context;
- context = re_string_context_at (&mctx->input, idx - 1, mctx->eflags);
- if (IS_WORD_CONTEXT (context))
- return dfa->init_state_word;
- else if (IS_ORDINARY_CONTEXT (context))
- return dfa->init_state;
- else if (IS_BEGBUF_CONTEXT (context) && IS_NEWLINE_CONTEXT (context))
- return dfa->init_state_begbuf;
- else if (IS_NEWLINE_CONTEXT (context))
- return dfa->init_state_nl;
- else if (IS_BEGBUF_CONTEXT (context))
- {
- /* It is relatively rare case, then calculate on demand. */
- return re_acquire_state_context (err, dfa,
- dfa->init_state->entrance_nodes,
- context);
- }
- else
- /* Must not happen? */
- return dfa->init_state;
- }
- else
- return dfa->init_state;
-}
-
-/* Check whether the regular expression match input string INPUT or not,
- and return the index where the matching end, return -1 if not match,
- or return -2 in case of an error.
- FL_LONGEST_MATCH means we want the POSIX longest matching.
- If P_MATCH_FIRST is not NULL, and the match fails, it is set to the
- next place where we may want to try matching.
- Note that the matcher assume that the maching starts from the current
- index of the buffer. */
-
-static int
-internal_function
-check_matching (re_match_context_t *mctx, int fl_longest_match,
- int *p_match_first)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- reg_errcode_t err;
- int match = 0;
- int match_last = -1;
- int cur_str_idx = re_string_cur_idx (&mctx->input);
- re_dfastate_t *cur_state;
- int at_init_state = p_match_first != NULL;
- int next_start_idx = cur_str_idx;
-
- err = REG_NOERROR;
- cur_state = acquire_init_state_context (&err, mctx, cur_str_idx);
- /* An initial state must not be NULL (invalid). */
- if (BE (cur_state == NULL, 0))
- {
- assert (err == REG_ESPACE);
- return -2;
- }
-
- if (mctx->state_log != NULL)
- {
- mctx->state_log[cur_str_idx] = cur_state;
-
- /* Check OP_OPEN_SUBEXP in the initial state in case that we use them
- later. E.g. Processing back references. */
- if (BE (dfa->nbackref, 0))
- {
- at_init_state = 0;
- err = check_subexp_matching_top (mctx, &cur_state->nodes, 0);
- if (BE (err != REG_NOERROR, 0))
- return err;
-
- if (cur_state->has_backref)
- {
- err = transit_state_bkref (mctx, &cur_state->nodes);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
- }
- }
-
- /* If the RE accepts NULL string. */
- if (BE (cur_state->halt, 0))
- {
- if (!cur_state->has_constraint
- || check_halt_state_context (mctx, cur_state, cur_str_idx))
- {
- if (!fl_longest_match)
- return cur_str_idx;
- else
- {
- match_last = cur_str_idx;
- match = 1;
- }
- }
- }
-
- while (!re_string_eoi (&mctx->input))
- {
- re_dfastate_t *old_state = cur_state;
- int next_char_idx = re_string_cur_idx (&mctx->input) + 1;
-
- if (BE (next_char_idx >= mctx->input.bufs_len, 0)
- || (BE (next_char_idx >= mctx->input.valid_len, 0)
- && mctx->input.valid_len < mctx->input.len))
- {
- err = extend_buffers (mctx);
- if (BE (err != REG_NOERROR, 0))
- {
- assert (err == REG_ESPACE);
- return -2;
- }
- }
-
- cur_state = transit_state (&err, mctx, cur_state);
- if (mctx->state_log != NULL)
- cur_state = merge_state_with_log (&err, mctx, cur_state);
-
- if (cur_state == NULL)
- {
- /* Reached the invalid state or an error. Try to recover a valid
- state using the state log, if available and if we have not
- already found a valid (even if not the longest) match. */
- if (BE (err != REG_NOERROR, 0))
- return -2;
-
- if (mctx->state_log == NULL
- || (match && !fl_longest_match)
- || (cur_state = find_recover_state (&err, mctx)) == NULL)
- break;
- }
-
- if (BE (at_init_state, 0))
- {
- if (old_state == cur_state)
- next_start_idx = next_char_idx;
- else
- at_init_state = 0;
- }
-
- if (cur_state->halt)
- {
- /* Reached a halt state.
- Check the halt state can satisfy the current context. */
- if (!cur_state->has_constraint
- || check_halt_state_context (mctx, cur_state,
- re_string_cur_idx (&mctx->input)))
- {
- /* We found an appropriate halt state. */
- match_last = re_string_cur_idx (&mctx->input);
- match = 1;
-
- /* We found a match, do not modify match_first below. */
- p_match_first = NULL;
- if (!fl_longest_match)
- break;
- }
- }
- }
-
- if (p_match_first)
- *p_match_first += next_start_idx;
-
- return match_last;
-}
-
-/* Check NODE match the current context. */
-
-static int
-internal_function
-check_halt_node_context (const re_dfa_t *dfa, int node, unsigned int context)
-{
- re_token_type_t type = dfa->nodes[node].type;
- unsigned int constraint = dfa->nodes[node].constraint;
- if (type != END_OF_RE)
- return 0;
- if (!constraint)
- return 1;
- if (NOT_SATISFY_NEXT_CONSTRAINT (constraint, context))
- return 0;
- return 1;
-}
-
-/* Check the halt state STATE match the current context.
- Return 0 if not match, if the node, STATE has, is a halt node and
- match the context, return the node. */
-
-static int
-internal_function
-check_halt_state_context (const re_match_context_t *mctx,
- const re_dfastate_t *state, int idx)
-{
- int i;
- unsigned int context;
-#ifdef DEBUG
- assert (state->halt);
-#endif
- context = re_string_context_at (&mctx->input, idx, mctx->eflags);
- for (i = 0; i < state->nodes.nelem; ++i)
- if (check_halt_node_context (mctx->dfa, state->nodes.elems[i], context))
- return state->nodes.elems[i];
- return 0;
-}
-
-/* Compute the next node to which "NFA" transit from NODE("NFA" is a NFA
- corresponding to the DFA).
- Return the destination node, and update EPS_VIA_NODES, return -1 in case
- of errors. */
-
-static int
-internal_function
-proceed_next_node (const re_match_context_t *mctx, int nregs, regmatch_t *regs,
- int *pidx, int node, re_node_set *eps_via_nodes,
- struct re_fail_stack_t *fs)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- int i, err;
- if (IS_EPSILON_NODE (dfa->nodes[node].type))
- {
- re_node_set *cur_nodes = &mctx->state_log[*pidx]->nodes;
- re_node_set *edests = &dfa->edests[node];
- int dest_node;
- err = re_node_set_insert (eps_via_nodes, node);
- if (BE (err < 0, 0))
- return -2;
- /* Pick up a valid destination, or return -1 if none is found. */
- for (dest_node = -1, i = 0; i < edests->nelem; ++i)
- {
- int candidate = edests->elems[i];
- if (!re_node_set_contains (cur_nodes, candidate))
- continue;
- if (dest_node == -1)
- dest_node = candidate;
-
- else
- {
- /* In order to avoid infinite loop like "(a*)*", return the second
- epsilon-transition if the first was already considered. */
- if (re_node_set_contains (eps_via_nodes, dest_node))
- return candidate;
-
- /* Otherwise, push the second epsilon-transition on the fail stack. */
- else if (fs != NULL
- && push_fail_stack (fs, *pidx, candidate, nregs, regs,
- eps_via_nodes))
- return -2;
-
- /* We know we are going to exit. */
- break;
- }
- }
- return dest_node;
- }
- else
- {
- int naccepted = 0;
- re_token_type_t type = dfa->nodes[node].type;
-
-#ifdef RE_ENABLE_I18N
- if (dfa->nodes[node].accept_mb)
- naccepted = check_node_accept_bytes (dfa, node, &mctx->input, *pidx);
- else
-#endif /* RE_ENABLE_I18N */
- if (type == OP_BACK_REF)
- {
- int subexp_idx = dfa->nodes[node].opr.idx + 1;
- naccepted = regs[subexp_idx].rm_eo - regs[subexp_idx].rm_so;
- if (fs != NULL)
- {
- if (regs[subexp_idx].rm_so == -1 || regs[subexp_idx].rm_eo == -1)
- return -1;
- else if (naccepted)
- {
- char *buf = (char *) re_string_get_buffer (&mctx->input);
- if (memcmp (buf + regs[subexp_idx].rm_so, buf + *pidx,
- naccepted) != 0)
- return -1;
- }
- }
-
- if (naccepted == 0)
- {
- int dest_node;
- err = re_node_set_insert (eps_via_nodes, node);
- if (BE (err < 0, 0))
- return -2;
- dest_node = dfa->edests[node].elems[0];
- if (re_node_set_contains (&mctx->state_log[*pidx]->nodes,
- dest_node))
- return dest_node;
- }
- }
-
- if (naccepted != 0
- || check_node_accept (mctx, dfa->nodes + node, *pidx))
- {
- int dest_node = dfa->nexts[node];
- *pidx = (naccepted == 0) ? *pidx + 1 : *pidx + naccepted;
- if (fs && (*pidx > mctx->match_last || mctx->state_log[*pidx] == NULL
- || !re_node_set_contains (&mctx->state_log[*pidx]->nodes,
- dest_node)))
- return -1;
- re_node_set_empty (eps_via_nodes);
- return dest_node;
- }
- }
- return -1;
-}
-
-static reg_errcode_t
-internal_function
-push_fail_stack (struct re_fail_stack_t *fs, int str_idx, int dest_node,
- int nregs, regmatch_t *regs, re_node_set *eps_via_nodes)
-{
- reg_errcode_t err;
- int num = fs->num++;
- if (fs->num == fs->alloc)
- {
- struct re_fail_stack_ent_t *new_array;
- new_array = realloc (fs->stack, (sizeof (struct re_fail_stack_ent_t)
- * fs->alloc * 2));
- if (new_array == NULL)
- return REG_ESPACE;
- fs->alloc *= 2;
- fs->stack = new_array;
- }
- fs->stack[num].idx = str_idx;
- fs->stack[num].node = dest_node;
- fs->stack[num].regs = re_malloc (regmatch_t, nregs);
- if (fs->stack[num].regs == NULL)
- return REG_ESPACE;
- memcpy (fs->stack[num].regs, regs, sizeof (regmatch_t) * nregs);
- err = re_node_set_init_copy (&fs->stack[num].eps_via_nodes, eps_via_nodes);
- return err;
-}
-
-static int
-internal_function
-pop_fail_stack (struct re_fail_stack_t *fs, int *pidx, int nregs,
- regmatch_t *regs, re_node_set *eps_via_nodes)
-{
- int num = --fs->num;
- assert (num >= 0);
- *pidx = fs->stack[num].idx;
- memcpy (regs, fs->stack[num].regs, sizeof (regmatch_t) * nregs);
- re_node_set_free (eps_via_nodes);
- re_free (fs->stack[num].regs);
- *eps_via_nodes = fs->stack[num].eps_via_nodes;
- return fs->stack[num].node;
-}
-
-/* Set the positions where the subexpressions are starts/ends to registers
- PMATCH.
- Note: We assume that pmatch[0] is already set, and
- pmatch[i].rm_so == pmatch[i].rm_eo == -1 for 0 < i < nmatch. */
-
-static reg_errcode_t
-internal_function
-set_regs (const regex_t *preg, const re_match_context_t *mctx, size_t nmatch,
- regmatch_t *pmatch, int fl_backtrack)
-{
- const re_dfa_t *dfa = (const re_dfa_t *) preg->buffer;
- int idx, cur_node;
- re_node_set eps_via_nodes;
- struct re_fail_stack_t *fs;
- struct re_fail_stack_t fs_body = { 0, 2, NULL };
- regmatch_t *prev_idx_match;
- int prev_idx_match_malloced = 0;
-
-#ifdef DEBUG
- assert (nmatch > 1);
- assert (mctx->state_log != NULL);
-#endif
- if (fl_backtrack)
- {
- fs = &fs_body;
- fs->stack = re_malloc (struct re_fail_stack_ent_t, fs->alloc);
- if (fs->stack == NULL)
- return REG_ESPACE;
- }
- else
- fs = NULL;
-
- cur_node = dfa->init_node;
- re_node_set_init_empty (&eps_via_nodes);
-
- if (__libc_use_alloca (nmatch * sizeof (regmatch_t)))
- prev_idx_match = (regmatch_t *) alloca (nmatch * sizeof (regmatch_t));
- else
- {
- prev_idx_match = re_malloc (regmatch_t, nmatch);
- if (prev_idx_match == NULL)
- {
- free_fail_stack_return (fs);
- return REG_ESPACE;
- }
- prev_idx_match_malloced = 1;
- }
- memcpy (prev_idx_match, pmatch, sizeof (regmatch_t) * nmatch);
-
- for (idx = pmatch[0].rm_so; idx <= pmatch[0].rm_eo ;)
- {
- update_regs (dfa, pmatch, prev_idx_match, cur_node, idx, nmatch);
-
- if (idx == pmatch[0].rm_eo && cur_node == mctx->last_node)
- {
- int reg_idx;
- if (fs)
- {
- for (reg_idx = 0; reg_idx < nmatch; ++reg_idx)
- if (pmatch[reg_idx].rm_so > -1 && pmatch[reg_idx].rm_eo == -1)
- break;
- if (reg_idx == nmatch)
- {
- re_node_set_free (&eps_via_nodes);
- if (prev_idx_match_malloced)
- re_free (prev_idx_match);
- return free_fail_stack_return (fs);
- }
- cur_node = pop_fail_stack (fs, &idx, nmatch, pmatch,
- &eps_via_nodes);
- }
- else
- {
- re_node_set_free (&eps_via_nodes);
- if (prev_idx_match_malloced)
- re_free (prev_idx_match);
- return REG_NOERROR;
- }
- }
-
- /* Proceed to next node. */
- cur_node = proceed_next_node (mctx, nmatch, pmatch, &idx, cur_node,
- &eps_via_nodes, fs);
-
- if (BE (cur_node < 0, 0))
- {
- if (BE (cur_node == -2, 0))
- {
- re_node_set_free (&eps_via_nodes);
- if (prev_idx_match_malloced)
- re_free (prev_idx_match);
- free_fail_stack_return (fs);
- return REG_ESPACE;
- }
- if (fs)
- cur_node = pop_fail_stack (fs, &idx, nmatch, pmatch,
- &eps_via_nodes);
- else
- {
- re_node_set_free (&eps_via_nodes);
- if (prev_idx_match_malloced)
- re_free (prev_idx_match);
- return REG_NOMATCH;
- }
- }
- }
- re_node_set_free (&eps_via_nodes);
- if (prev_idx_match_malloced)
- re_free (prev_idx_match);
- return free_fail_stack_return (fs);
-}
-
-static reg_errcode_t
-internal_function
-free_fail_stack_return (struct re_fail_stack_t *fs)
-{
- if (fs)
- {
- int fs_idx;
- for (fs_idx = 0; fs_idx < fs->num; ++fs_idx)
- {
- re_node_set_free (&fs->stack[fs_idx].eps_via_nodes);
- re_free (fs->stack[fs_idx].regs);
- }
- re_free (fs->stack);
- }
- return REG_NOERROR;
-}
-
-static void
-internal_function
-update_regs (const re_dfa_t *dfa, regmatch_t *pmatch,
- regmatch_t *prev_idx_match, int cur_node, int cur_idx, int nmatch)
-{
- int type = dfa->nodes[cur_node].type;
- if (type == OP_OPEN_SUBEXP)
- {
- int reg_num = dfa->nodes[cur_node].opr.idx + 1;
-
- /* We are at the first node of this sub expression. */
- if (reg_num < nmatch)
- {
- pmatch[reg_num].rm_so = cur_idx;
- pmatch[reg_num].rm_eo = -1;
- }
- }
- else if (type == OP_CLOSE_SUBEXP)
- {
- int reg_num = dfa->nodes[cur_node].opr.idx + 1;
- if (reg_num < nmatch)
- {
- /* We are at the last node of this sub expression. */
- if (pmatch[reg_num].rm_so < cur_idx)
- {
- pmatch[reg_num].rm_eo = cur_idx;
- /* This is a non-empty match or we are not inside an optional
- subexpression. Accept this right away. */
- memcpy (prev_idx_match, pmatch, sizeof (regmatch_t) * nmatch);
- }
- else
- {
- if (dfa->nodes[cur_node].opt_subexp
- && prev_idx_match[reg_num].rm_so != -1)
- /* We transited through an empty match for an optional
- subexpression, like (a?)*, and this is not the subexp's
- first match. Copy back the old content of the registers
- so that matches of an inner subexpression are undone as
- well, like in ((a?))*. */
- memcpy (pmatch, prev_idx_match, sizeof (regmatch_t) * nmatch);
- else
- /* We completed a subexpression, but it may be part of
- an optional one, so do not update PREV_IDX_MATCH. */
- pmatch[reg_num].rm_eo = cur_idx;
- }
- }
- }
-}
-
-/* This function checks the STATE_LOG from the SCTX->last_str_idx to 0
- and sift the nodes in each states according to the following rules.
- Updated state_log will be wrote to STATE_LOG.
-
- Rules: We throw away the Node `a' in the STATE_LOG[STR_IDX] if...
- 1. When STR_IDX == MATCH_LAST(the last index in the state_log):
- If `a' isn't the LAST_NODE and `a' can't epsilon transit to
- the LAST_NODE, we throw away the node `a'.
- 2. When 0 <= STR_IDX < MATCH_LAST and `a' accepts
- string `s' and transit to `b':
- i. If 'b' isn't in the STATE_LOG[STR_IDX+strlen('s')], we throw
- away the node `a'.
- ii. If 'b' is in the STATE_LOG[STR_IDX+strlen('s')] but 'b' is
- thrown away, we throw away the node `a'.
- 3. When 0 <= STR_IDX < MATCH_LAST and 'a' epsilon transit to 'b':
- i. If 'b' isn't in the STATE_LOG[STR_IDX], we throw away the
- node `a'.
- ii. If 'b' is in the STATE_LOG[STR_IDX] but 'b' is thrown away,
- we throw away the node `a'. */
-
-#define STATE_NODE_CONTAINS(state,node) \
- ((state) != NULL && re_node_set_contains (&(state)->nodes, node))
-
-static reg_errcode_t
-internal_function
-sift_states_backward (const re_match_context_t *mctx, re_sift_context_t *sctx)
-{
- reg_errcode_t err;
- int null_cnt = 0;
- int str_idx = sctx->last_str_idx;
- re_node_set cur_dest;
-
-#ifdef DEBUG
- assert (mctx->state_log != NULL && mctx->state_log[str_idx] != NULL);
-#endif
-
- /* Build sifted state_log[str_idx]. It has the nodes which can epsilon
- transit to the last_node and the last_node itself. */
- err = re_node_set_init_1 (&cur_dest, sctx->last_node);
- if (BE (err != REG_NOERROR, 0))
- return err;
- err = update_cur_sifted_state (mctx, sctx, str_idx, &cur_dest);
- if (BE (err != REG_NOERROR, 0))
- goto free_return;
-
- /* Then check each states in the state_log. */
- while (str_idx > 0)
- {
- /* Update counters. */
- null_cnt = (sctx->sifted_states[str_idx] == NULL) ? null_cnt + 1 : 0;
- if (null_cnt > mctx->max_mb_elem_len)
- {
- memset (sctx->sifted_states, '\0',
- sizeof (re_dfastate_t *) * str_idx);
- re_node_set_free (&cur_dest);
- return REG_NOERROR;
- }
- re_node_set_empty (&cur_dest);
- --str_idx;
-
- if (mctx->state_log[str_idx])
- {
- err = build_sifted_states (mctx, sctx, str_idx, &cur_dest);
- if (BE (err != REG_NOERROR, 0))
- goto free_return;
- }
-
- /* Add all the nodes which satisfy the following conditions:
- - It can epsilon transit to a node in CUR_DEST.
- - It is in CUR_SRC.
- And update state_log. */
- err = update_cur_sifted_state (mctx, sctx, str_idx, &cur_dest);
- if (BE (err != REG_NOERROR, 0))
- goto free_return;
- }
- err = REG_NOERROR;
- free_return:
- re_node_set_free (&cur_dest);
- return err;
-}
-
-static reg_errcode_t
-internal_function
-build_sifted_states (const re_match_context_t *mctx, re_sift_context_t *sctx,
- int str_idx, re_node_set *cur_dest)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- const re_node_set *cur_src = &mctx->state_log[str_idx]->non_eps_nodes;
- int i;
-
- /* Then build the next sifted state.
- We build the next sifted state on `cur_dest', and update
- `sifted_states[str_idx]' with `cur_dest'.
- Note:
- `cur_dest' is the sifted state from `state_log[str_idx + 1]'.
- `cur_src' points the node_set of the old `state_log[str_idx]'
- (with the epsilon nodes pre-filtered out). */
- for (i = 0; i < cur_src->nelem; i++)
- {
- int prev_node = cur_src->elems[i];
- int naccepted = 0;
- int ret;
-
-#ifdef DEBUG
- re_token_type_t type = dfa->nodes[prev_node].type;
- assert (!IS_EPSILON_NODE (type));
-#endif
-#ifdef RE_ENABLE_I18N
- /* If the node may accept `multi byte'. */
- if (dfa->nodes[prev_node].accept_mb)
- naccepted = sift_states_iter_mb (mctx, sctx, prev_node,
- str_idx, sctx->last_str_idx);
-#endif /* RE_ENABLE_I18N */
-
- /* We don't check backreferences here.
- See update_cur_sifted_state(). */
- if (!naccepted
- && check_node_accept (mctx, dfa->nodes + prev_node, str_idx)
- && STATE_NODE_CONTAINS (sctx->sifted_states[str_idx + 1],
- dfa->nexts[prev_node]))
- naccepted = 1;
-
- if (naccepted == 0)
- continue;
-
- if (sctx->limits.nelem)
- {
- int to_idx = str_idx + naccepted;
- if (check_dst_limits (mctx, &sctx->limits,
- dfa->nexts[prev_node], to_idx,
- prev_node, str_idx))
- continue;
- }
- ret = re_node_set_insert (cur_dest, prev_node);
- if (BE (ret == -1, 0))
- return REG_ESPACE;
- }
-
- return REG_NOERROR;
-}
-
-/* Helper functions. */
-
-static reg_errcode_t
-internal_function
-clean_state_log_if_needed (re_match_context_t *mctx, int next_state_log_idx)
-{
- int top = mctx->state_log_top;
-
- if (next_state_log_idx >= mctx->input.bufs_len
- || (next_state_log_idx >= mctx->input.valid_len
- && mctx->input.valid_len < mctx->input.len))
- {
- reg_errcode_t err;
- err = extend_buffers (mctx);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
-
- if (top < next_state_log_idx)
- {
- memset (mctx->state_log + top + 1, '\0',
- sizeof (re_dfastate_t *) * (next_state_log_idx - top));
- mctx->state_log_top = next_state_log_idx;
- }
- return REG_NOERROR;
-}
-
-static reg_errcode_t
-internal_function
-merge_state_array (const re_dfa_t *dfa, re_dfastate_t **dst,
- re_dfastate_t **src, int num)
-{
- int st_idx;
- reg_errcode_t err;
- for (st_idx = 0; st_idx < num; ++st_idx)
- {
- if (dst[st_idx] == NULL)
- dst[st_idx] = src[st_idx];
- else if (src[st_idx] != NULL)
- {
- re_node_set merged_set;
- err = re_node_set_init_union (&merged_set, &dst[st_idx]->nodes,
- &src[st_idx]->nodes);
- if (BE (err != REG_NOERROR, 0))
- return err;
- dst[st_idx] = re_acquire_state (&err, dfa, &merged_set);
- re_node_set_free (&merged_set);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
- }
- return REG_NOERROR;
-}
-
-static reg_errcode_t
-internal_function
-update_cur_sifted_state (const re_match_context_t *mctx,
- re_sift_context_t *sctx, int str_idx,
- re_node_set *dest_nodes)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- reg_errcode_t err = REG_NOERROR;
- const re_node_set *candidates;
- candidates = ((mctx->state_log[str_idx] == NULL) ? NULL
- : &mctx->state_log[str_idx]->nodes);
-
- if (dest_nodes->nelem == 0)
- sctx->sifted_states[str_idx] = NULL;
- else
- {
- if (candidates)
- {
- /* At first, add the nodes which can epsilon transit to a node in
- DEST_NODE. */
- err = add_epsilon_src_nodes (dfa, dest_nodes, candidates);
- if (BE (err != REG_NOERROR, 0))
- return err;
-
- /* Then, check the limitations in the current sift_context. */
- if (sctx->limits.nelem)
- {
- err = check_subexp_limits (dfa, dest_nodes, candidates, &sctx->limits,
- mctx->bkref_ents, str_idx);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
- }
-
- sctx->sifted_states[str_idx] = re_acquire_state (&err, dfa, dest_nodes);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
-
- if (candidates && mctx->state_log[str_idx]->has_backref)
- {
- err = sift_states_bkref (mctx, sctx, str_idx, candidates);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
- return REG_NOERROR;
-}
-
-static reg_errcode_t
-internal_function
-add_epsilon_src_nodes (const re_dfa_t *dfa, re_node_set *dest_nodes,
- const re_node_set *candidates)
-{
- reg_errcode_t err = REG_NOERROR;
- int i;
-
- re_dfastate_t *state = re_acquire_state (&err, dfa, dest_nodes);
- if (BE (err != REG_NOERROR, 0))
- return err;
-
- if (!state->inveclosure.alloc)
- {
- err = re_node_set_alloc (&state->inveclosure, dest_nodes->nelem);
- if (BE (err != REG_NOERROR, 0))
- return REG_ESPACE;
- for (i = 0; i < dest_nodes->nelem; i++)
- re_node_set_merge (&state->inveclosure,
- dfa->inveclosures + dest_nodes->elems[i]);
- }
- return re_node_set_add_intersect (dest_nodes, candidates,
- &state->inveclosure);
-}
-
-static reg_errcode_t
-internal_function
-sub_epsilon_src_nodes (const re_dfa_t *dfa, int node, re_node_set *dest_nodes,
- const re_node_set *candidates)
-{
- int ecl_idx;
- reg_errcode_t err;
- re_node_set *inv_eclosure = dfa->inveclosures + node;
- re_node_set except_nodes;
- re_node_set_init_empty (&except_nodes);
- for (ecl_idx = 0; ecl_idx < inv_eclosure->nelem; ++ecl_idx)
- {
- int cur_node = inv_eclosure->elems[ecl_idx];
- if (cur_node == node)
- continue;
- if (IS_EPSILON_NODE (dfa->nodes[cur_node].type))
- {
- int edst1 = dfa->edests[cur_node].elems[0];
- int edst2 = ((dfa->edests[cur_node].nelem > 1)
- ? dfa->edests[cur_node].elems[1] : -1);
- if ((!re_node_set_contains (inv_eclosure, edst1)
- && re_node_set_contains (dest_nodes, edst1))
- || (edst2 > 0
- && !re_node_set_contains (inv_eclosure, edst2)
- && re_node_set_contains (dest_nodes, edst2)))
- {
- err = re_node_set_add_intersect (&except_nodes, candidates,
- dfa->inveclosures + cur_node);
- if (BE (err != REG_NOERROR, 0))
- {
- re_node_set_free (&except_nodes);
- return err;
- }
- }
- }
- }
- for (ecl_idx = 0; ecl_idx < inv_eclosure->nelem; ++ecl_idx)
- {
- int cur_node = inv_eclosure->elems[ecl_idx];
- if (!re_node_set_contains (&except_nodes, cur_node))
- {
- int idx = re_node_set_contains (dest_nodes, cur_node) - 1;
- re_node_set_remove_at (dest_nodes, idx);
- }
- }
- re_node_set_free (&except_nodes);
- return REG_NOERROR;
-}
-
-static int
-internal_function
-check_dst_limits (const re_match_context_t *mctx, re_node_set *limits,
- int dst_node, int dst_idx, int src_node, int src_idx)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- int lim_idx, src_pos, dst_pos;
-
- int dst_bkref_idx = search_cur_bkref_entry (mctx, dst_idx);
- int src_bkref_idx = search_cur_bkref_entry (mctx, src_idx);
- for (lim_idx = 0; lim_idx < limits->nelem; ++lim_idx)
- {
- int subexp_idx;
- struct re_backref_cache_entry *ent;
- ent = mctx->bkref_ents + limits->elems[lim_idx];
- subexp_idx = dfa->nodes[ent->node].opr.idx;
-
- dst_pos = check_dst_limits_calc_pos (mctx, limits->elems[lim_idx],
- subexp_idx, dst_node, dst_idx,
- dst_bkref_idx);
- src_pos = check_dst_limits_calc_pos (mctx, limits->elems[lim_idx],
- subexp_idx, src_node, src_idx,
- src_bkref_idx);
-
- /* In case of:
- <src> <dst> ( <subexp> )
- ( <subexp> ) <src> <dst>
- ( <subexp1> <src> <subexp2> <dst> <subexp3> ) */
- if (src_pos == dst_pos)
- continue; /* This is unrelated limitation. */
- else
- return 1;
- }
- return 0;
-}
-
-static int
-internal_function
-check_dst_limits_calc_pos_1 (const re_match_context_t *mctx, int boundaries,
- int subexp_idx, int from_node, int bkref_idx)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- const re_node_set *eclosures = dfa->eclosures + from_node;
- int node_idx;
-
- /* Else, we are on the boundary: examine the nodes on the epsilon
- closure. */
- for (node_idx = 0; node_idx < eclosures->nelem; ++node_idx)
- {
- int node = eclosures->elems[node_idx];
- switch (dfa->nodes[node].type)
- {
- case OP_BACK_REF:
- if (bkref_idx != -1)
- {
- struct re_backref_cache_entry *ent = mctx->bkref_ents + bkref_idx;
- do
- {
- int dst, cpos;
-
- if (ent->node != node)
- continue;
-
- if (subexp_idx < BITSET_WORD_BITS
- && !(ent->eps_reachable_subexps_map
- & ((bitset_word_t) 1 << subexp_idx)))
- continue;
-
- /* Recurse trying to reach the OP_OPEN_SUBEXP and
- OP_CLOSE_SUBEXP cases below. But, if the
- destination node is the same node as the source
- node, don't recurse because it would cause an
- infinite loop: a regex that exhibits this behavior
- is ()\1*\1* */
- dst = dfa->edests[node].elems[0];
- if (dst == from_node)
- {
- if (boundaries & 1)
- return -1;
- else /* if (boundaries & 2) */
- return 0;
- }
-
- cpos =
- check_dst_limits_calc_pos_1 (mctx, boundaries, subexp_idx,
- dst, bkref_idx);
- if (cpos == -1 /* && (boundaries & 1) */)
- return -1;
- if (cpos == 0 && (boundaries & 2))
- return 0;
-
- if (subexp_idx < BITSET_WORD_BITS)
- ent->eps_reachable_subexps_map
- &= ~((bitset_word_t) 1 << subexp_idx);
- }
- while (ent++->more);
- }
- break;
-
- case OP_OPEN_SUBEXP:
- if ((boundaries & 1) && subexp_idx == dfa->nodes[node].opr.idx)
- return -1;
- break;
-
- case OP_CLOSE_SUBEXP:
- if ((boundaries & 2) && subexp_idx == dfa->nodes[node].opr.idx)
- return 0;
- break;
-
- default:
- break;
- }
- }
-
- return (boundaries & 2) ? 1 : 0;
-}
-
-static int
-internal_function
-check_dst_limits_calc_pos (const re_match_context_t *mctx, int limit,
- int subexp_idx, int from_node, int str_idx,
- int bkref_idx)
-{
- struct re_backref_cache_entry *lim = mctx->bkref_ents + limit;
- int boundaries;
-
- /* If we are outside the range of the subexpression, return -1 or 1. */
- if (str_idx < lim->subexp_from)
- return -1;
-
- if (lim->subexp_to < str_idx)
- return 1;
-
- /* If we are within the subexpression, return 0. */
- boundaries = (str_idx == lim->subexp_from);
- boundaries |= (str_idx == lim->subexp_to) << 1;
- if (boundaries == 0)
- return 0;
-
- /* Else, examine epsilon closure. */
- return check_dst_limits_calc_pos_1 (mctx, boundaries, subexp_idx,
- from_node, bkref_idx);
-}
-
-/* Check the limitations of sub expressions LIMITS, and remove the nodes
- which are against limitations from DEST_NODES. */
-
-static reg_errcode_t
-internal_function
-check_subexp_limits (const re_dfa_t *dfa, re_node_set *dest_nodes,
- const re_node_set *candidates, re_node_set *limits,
- struct re_backref_cache_entry *bkref_ents, int str_idx)
-{
- reg_errcode_t err;
- int node_idx, lim_idx;
-
- for (lim_idx = 0; lim_idx < limits->nelem; ++lim_idx)
- {
- int subexp_idx;
- struct re_backref_cache_entry *ent;
- ent = bkref_ents + limits->elems[lim_idx];
-
- if (str_idx <= ent->subexp_from || ent->str_idx < str_idx)
- continue; /* This is unrelated limitation. */
-
- subexp_idx = dfa->nodes[ent->node].opr.idx;
- if (ent->subexp_to == str_idx)
- {
- int ops_node = -1;
- int cls_node = -1;
- for (node_idx = 0; node_idx < dest_nodes->nelem; ++node_idx)
- {
- int node = dest_nodes->elems[node_idx];
- re_token_type_t type = dfa->nodes[node].type;
- if (type == OP_OPEN_SUBEXP
- && subexp_idx == dfa->nodes[node].opr.idx)
- ops_node = node;
- else if (type == OP_CLOSE_SUBEXP
- && subexp_idx == dfa->nodes[node].opr.idx)
- cls_node = node;
- }
-
- /* Check the limitation of the open subexpression. */
- /* Note that (ent->subexp_to = str_idx != ent->subexp_from). */
- if (ops_node >= 0)
- {
- err = sub_epsilon_src_nodes (dfa, ops_node, dest_nodes,
- candidates);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
-
- /* Check the limitation of the close subexpression. */
- if (cls_node >= 0)
- for (node_idx = 0; node_idx < dest_nodes->nelem; ++node_idx)
- {
- int node = dest_nodes->elems[node_idx];
- if (!re_node_set_contains (dfa->inveclosures + node,
- cls_node)
- && !re_node_set_contains (dfa->eclosures + node,
- cls_node))
- {
- /* It is against this limitation.
- Remove it form the current sifted state. */
- err = sub_epsilon_src_nodes (dfa, node, dest_nodes,
- candidates);
- if (BE (err != REG_NOERROR, 0))
- return err;
- --node_idx;
- }
- }
- }
- else /* (ent->subexp_to != str_idx) */
- {
- for (node_idx = 0; node_idx < dest_nodes->nelem; ++node_idx)
- {
- int node = dest_nodes->elems[node_idx];
- re_token_type_t type = dfa->nodes[node].type;
- if (type == OP_CLOSE_SUBEXP || type == OP_OPEN_SUBEXP)
- {
- if (subexp_idx != dfa->nodes[node].opr.idx)
- continue;
- /* It is against this limitation.
- Remove it form the current sifted state. */
- err = sub_epsilon_src_nodes (dfa, node, dest_nodes,
- candidates);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
- }
- }
- }
- return REG_NOERROR;
-}
-
-static reg_errcode_t
-internal_function
-sift_states_bkref (const re_match_context_t *mctx, re_sift_context_t *sctx,
- int str_idx, const re_node_set *candidates)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- reg_errcode_t err;
- int node_idx, node;
- re_sift_context_t local_sctx;
- int first_idx = search_cur_bkref_entry (mctx, str_idx);
-
- if (first_idx == -1)
- return REG_NOERROR;
-
- local_sctx.sifted_states = NULL; /* Mark that it hasn't been initialized. */
-
- for (node_idx = 0; node_idx < candidates->nelem; ++node_idx)
- {
- int enabled_idx;
- re_token_type_t type;
- struct re_backref_cache_entry *entry;
- node = candidates->elems[node_idx];
- type = dfa->nodes[node].type;
- /* Avoid infinite loop for the REs like "()\1+". */
- if (node == sctx->last_node && str_idx == sctx->last_str_idx)
- continue;
- if (type != OP_BACK_REF)
- continue;
-
- entry = mctx->bkref_ents + first_idx;
- enabled_idx = first_idx;
- do
- {
- int subexp_len;
- int to_idx;
- int dst_node;
- int ret;
- re_dfastate_t *cur_state;
-
- if (entry->node != node)
- continue;
- subexp_len = entry->subexp_to - entry->subexp_from;
- to_idx = str_idx + subexp_len;
- dst_node = (subexp_len ? dfa->nexts[node]
- : dfa->edests[node].elems[0]);
-
- if (to_idx > sctx->last_str_idx
- || sctx->sifted_states[to_idx] == NULL
- || !STATE_NODE_CONTAINS (sctx->sifted_states[to_idx], dst_node)
- || check_dst_limits (mctx, &sctx->limits, node,
- str_idx, dst_node, to_idx))
- continue;
-
- if (local_sctx.sifted_states == NULL)
- {
- local_sctx = *sctx;
- err = re_node_set_init_copy (&local_sctx.limits, &sctx->limits);
- if (BE (err != REG_NOERROR, 0))
- goto free_return;
- }
- local_sctx.last_node = node;
- local_sctx.last_str_idx = str_idx;
- ret = re_node_set_insert (&local_sctx.limits, enabled_idx);
- if (BE (ret < 0, 0))
- {
- err = REG_ESPACE;
- goto free_return;
- }
- cur_state = local_sctx.sifted_states[str_idx];
- err = sift_states_backward (mctx, &local_sctx);
- if (BE (err != REG_NOERROR, 0))
- goto free_return;
- if (sctx->limited_states != NULL)
- {
- err = merge_state_array (dfa, sctx->limited_states,
- local_sctx.sifted_states,
- str_idx + 1);
- if (BE (err != REG_NOERROR, 0))
- goto free_return;
- }
- local_sctx.sifted_states[str_idx] = cur_state;
- re_node_set_remove (&local_sctx.limits, enabled_idx);
-
- /* mctx->bkref_ents may have changed, reload the pointer. */
- entry = mctx->bkref_ents + enabled_idx;
- }
- while (enabled_idx++, entry++->more);
- }
- err = REG_NOERROR;
- free_return:
- if (local_sctx.sifted_states != NULL)
- {
- re_node_set_free (&local_sctx.limits);
- }
-
- return err;
-}
-
-
-#ifdef RE_ENABLE_I18N
-static int
-internal_function
-sift_states_iter_mb (const re_match_context_t *mctx, re_sift_context_t *sctx,
- int node_idx, int str_idx, int max_str_idx)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- int naccepted;
- /* Check the node can accept `multi byte'. */
- naccepted = check_node_accept_bytes (dfa, node_idx, &mctx->input, str_idx);
- if (naccepted > 0 && str_idx + naccepted <= max_str_idx &&
- !STATE_NODE_CONTAINS (sctx->sifted_states[str_idx + naccepted],
- dfa->nexts[node_idx]))
- /* The node can't accept the `multi byte', or the
- destination was already thrown away, then the node
- could't accept the current input `multi byte'. */
- naccepted = 0;
- /* Otherwise, it is sure that the node could accept
- `naccepted' bytes input. */
- return naccepted;
-}
-#endif /* RE_ENABLE_I18N */
-
-
-/* Functions for state transition. */
-
-/* Return the next state to which the current state STATE will transit by
- accepting the current input byte, and update STATE_LOG if necessary.
- If STATE can accept a multibyte char/collating element/back reference
- update the destination of STATE_LOG. */
-
-static re_dfastate_t *
-internal_function
-transit_state (reg_errcode_t *err, re_match_context_t *mctx,
- re_dfastate_t *state)
-{
- re_dfastate_t **trtable;
- unsigned char ch;
-
-#ifdef RE_ENABLE_I18N
- /* If the current state can accept multibyte. */
- if (BE (state->accept_mb, 0))
- {
- *err = transit_state_mb (mctx, state);
- if (BE (*err != REG_NOERROR, 0))
- return NULL;
- }
-#endif /* RE_ENABLE_I18N */
-
- /* Then decide the next state with the single byte. */
-#if 0
- if (0)
- /* don't use transition table */
- return transit_state_sb (err, mctx, state);
-#endif
-
- /* Use transition table */
- ch = re_string_fetch_byte (&mctx->input);
- for (;;)
- {
- trtable = state->trtable;
- if (BE (trtable != NULL, 1))
- return trtable[ch];
-
- trtable = state->word_trtable;
- if (BE (trtable != NULL, 1))
- {
- unsigned int context;
- context
- = re_string_context_at (&mctx->input,
- re_string_cur_idx (&mctx->input) - 1,
- mctx->eflags);
- if (IS_WORD_CONTEXT (context))
- return trtable[ch + SBC_MAX];
- else
- return trtable[ch];
- }
-
- if (!build_trtable (mctx->dfa, state))
- {
- *err = REG_ESPACE;
- return NULL;
- }
-
- /* Retry, we now have a transition table. */
- }
-}
-
-/* Update the state_log if we need */
-re_dfastate_t *
-internal_function
-merge_state_with_log (reg_errcode_t *err, re_match_context_t *mctx,
- re_dfastate_t *next_state)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- int cur_idx = re_string_cur_idx (&mctx->input);
-
- if (cur_idx > mctx->state_log_top)
- {
- mctx->state_log[cur_idx] = next_state;
- mctx->state_log_top = cur_idx;
- }
- else if (mctx->state_log[cur_idx] == 0)
- {
- mctx->state_log[cur_idx] = next_state;
- }
- else
- {
- re_dfastate_t *pstate;
- unsigned int context;
- re_node_set next_nodes, *log_nodes, *table_nodes = NULL;
- /* If (state_log[cur_idx] != 0), it implies that cur_idx is
- the destination of a multibyte char/collating element/
- back reference. Then the next state is the union set of
- these destinations and the results of the transition table. */
- pstate = mctx->state_log[cur_idx];
- log_nodes = pstate->entrance_nodes;
- if (next_state != NULL)
- {
- table_nodes = next_state->entrance_nodes;
- *err = re_node_set_init_union (&next_nodes, table_nodes,
- log_nodes);
- if (BE (*err != REG_NOERROR, 0))
- return NULL;
- }
- else
- next_nodes = *log_nodes;
- /* Note: We already add the nodes of the initial state,
- then we don't need to add them here. */
-
- context = re_string_context_at (&mctx->input,
- re_string_cur_idx (&mctx->input) - 1,
- mctx->eflags);
- next_state = mctx->state_log[cur_idx]
- = re_acquire_state_context (err, dfa, &next_nodes, context);
- /* We don't need to check errors here, since the return value of
- this function is next_state and ERR is already set. */
-
- if (table_nodes != NULL)
- re_node_set_free (&next_nodes);
- }
-
- if (BE (dfa->nbackref, 0) && next_state != NULL)
- {
- /* Check OP_OPEN_SUBEXP in the current state in case that we use them
- later. We must check them here, since the back references in the
- next state might use them. */
- *err = check_subexp_matching_top (mctx, &next_state->nodes,
- cur_idx);
- if (BE (*err != REG_NOERROR, 0))
- return NULL;
-
- /* If the next state has back references. */
- if (next_state->has_backref)
- {
- *err = transit_state_bkref (mctx, &next_state->nodes);
- if (BE (*err != REG_NOERROR, 0))
- return NULL;
- next_state = mctx->state_log[cur_idx];
- }
- }
-
- return next_state;
-}
-
-/* Skip bytes in the input that correspond to part of a
- multi-byte match, then look in the log for a state
- from which to restart matching. */
-re_dfastate_t *
-internal_function
-find_recover_state (reg_errcode_t *err, re_match_context_t *mctx)
-{
- re_dfastate_t *cur_state;
- do
- {
- int max = mctx->state_log_top;
- int cur_str_idx = re_string_cur_idx (&mctx->input);
-
- do
- {
- if (++cur_str_idx > max)
- return NULL;
- re_string_skip_bytes (&mctx->input, 1);
- }
- while (mctx->state_log[cur_str_idx] == NULL);
-
- cur_state = merge_state_with_log (err, mctx, NULL);
- }
- while (*err == REG_NOERROR && cur_state == NULL);
- return cur_state;
-}
-
-/* Helper functions for transit_state. */
-
-/* From the node set CUR_NODES, pick up the nodes whose types are
- OP_OPEN_SUBEXP and which have corresponding back references in the regular
- expression. And register them to use them later for evaluating the
- correspoding back references. */
-
-static reg_errcode_t
-internal_function
-check_subexp_matching_top (re_match_context_t *mctx, re_node_set *cur_nodes,
- int str_idx)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- int node_idx;
- reg_errcode_t err;
-
- /* TODO: This isn't efficient.
- Because there might be more than one nodes whose types are
- OP_OPEN_SUBEXP and whose index is SUBEXP_IDX, we must check all
- nodes.
- E.g. RE: (a){2} */
- for (node_idx = 0; node_idx < cur_nodes->nelem; ++node_idx)
- {
- int node = cur_nodes->elems[node_idx];
- if (dfa->nodes[node].type == OP_OPEN_SUBEXP
- && dfa->nodes[node].opr.idx < BITSET_WORD_BITS
- && (dfa->used_bkref_map
- & ((bitset_word_t) 1 << dfa->nodes[node].opr.idx)))
- {
- err = match_ctx_add_subtop (mctx, node, str_idx);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
- }
- return REG_NOERROR;
-}
-
-#if 0
-/* Return the next state to which the current state STATE will transit by
- accepting the current input byte. */
-
-static re_dfastate_t *
-transit_state_sb (reg_errcode_t *err, re_match_context_t *mctx,
- re_dfastate_t *state)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- re_node_set next_nodes;
- re_dfastate_t *next_state;
- int node_cnt, cur_str_idx = re_string_cur_idx (&mctx->input);
- unsigned int context;
-
- *err = re_node_set_alloc (&next_nodes, state->nodes.nelem + 1);
- if (BE (*err != REG_NOERROR, 0))
- return NULL;
- for (node_cnt = 0; node_cnt < state->nodes.nelem; ++node_cnt)
- {
- int cur_node = state->nodes.elems[node_cnt];
- if (check_node_accept (mctx, dfa->nodes + cur_node, cur_str_idx))
- {
- *err = re_node_set_merge (&next_nodes,
- dfa->eclosures + dfa->nexts[cur_node]);
- if (BE (*err != REG_NOERROR, 0))
- {
- re_node_set_free (&next_nodes);
- return NULL;
- }
- }
- }
- context = re_string_context_at (&mctx->input, cur_str_idx, mctx->eflags);
- next_state = re_acquire_state_context (err, dfa, &next_nodes, context);
- /* We don't need to check errors here, since the return value of
- this function is next_state and ERR is already set. */
-
- re_node_set_free (&next_nodes);
- re_string_skip_bytes (&mctx->input, 1);
- return next_state;
-}
-#endif
-
-#ifdef RE_ENABLE_I18N
-static reg_errcode_t
-internal_function
-transit_state_mb (re_match_context_t *mctx, re_dfastate_t *pstate)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- reg_errcode_t err;
- int i;
-
- for (i = 0; i < pstate->nodes.nelem; ++i)
- {
- re_node_set dest_nodes, *new_nodes;
- int cur_node_idx = pstate->nodes.elems[i];
- int naccepted, dest_idx;
- unsigned int context;
- re_dfastate_t *dest_state;
-
- if (!dfa->nodes[cur_node_idx].accept_mb)
- continue;
-
- if (dfa->nodes[cur_node_idx].constraint)
- {
- context = re_string_context_at (&mctx->input,
- re_string_cur_idx (&mctx->input),
- mctx->eflags);
- if (NOT_SATISFY_NEXT_CONSTRAINT (dfa->nodes[cur_node_idx].constraint,
- context))
- continue;
- }
-
- /* How many bytes the node can accept? */
- naccepted = check_node_accept_bytes (dfa, cur_node_idx, &mctx->input,
- re_string_cur_idx (&mctx->input));
- if (naccepted == 0)
- continue;
-
- /* The node can accepts `naccepted' bytes. */
- dest_idx = re_string_cur_idx (&mctx->input) + naccepted;
- mctx->max_mb_elem_len = ((mctx->max_mb_elem_len < naccepted) ? naccepted
- : mctx->max_mb_elem_len);
- err = clean_state_log_if_needed (mctx, dest_idx);
- if (BE (err != REG_NOERROR, 0))
- return err;
-#ifdef DEBUG
- assert (dfa->nexts[cur_node_idx] != -1);
-#endif
- new_nodes = dfa->eclosures + dfa->nexts[cur_node_idx];
-
- dest_state = mctx->state_log[dest_idx];
- if (dest_state == NULL)
- dest_nodes = *new_nodes;
- else
- {
- err = re_node_set_init_union (&dest_nodes,
- dest_state->entrance_nodes, new_nodes);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
- context = re_string_context_at (&mctx->input, dest_idx - 1,
- mctx->eflags);
- mctx->state_log[dest_idx]
- = re_acquire_state_context (&err, dfa, &dest_nodes, context);
- if (dest_state != NULL)
- re_node_set_free (&dest_nodes);
- if (BE (mctx->state_log[dest_idx] == NULL && err != REG_NOERROR, 0))
- return err;
- }
- return REG_NOERROR;
-}
-#endif /* RE_ENABLE_I18N */
-
-static reg_errcode_t
-internal_function
-transit_state_bkref (re_match_context_t *mctx, const re_node_set *nodes)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- reg_errcode_t err;
- int i;
- int cur_str_idx = re_string_cur_idx (&mctx->input);
-
- for (i = 0; i < nodes->nelem; ++i)
- {
- int dest_str_idx, prev_nelem, bkc_idx;
- int node_idx = nodes->elems[i];
- unsigned int context;
- const re_token_t *node = dfa->nodes + node_idx;
- re_node_set *new_dest_nodes;
-
- /* Check whether `node' is a backreference or not. */
- if (node->type != OP_BACK_REF)
- continue;
-
- if (node->constraint)
- {
- context = re_string_context_at (&mctx->input, cur_str_idx,
- mctx->eflags);
- if (NOT_SATISFY_NEXT_CONSTRAINT (node->constraint, context))
- continue;
- }
-
- /* `node' is a backreference.
- Check the substring which the substring matched. */
- bkc_idx = mctx->nbkref_ents;
- err = get_subexp (mctx, node_idx, cur_str_idx);
- if (BE (err != REG_NOERROR, 0))
- goto free_return;
-
- /* And add the epsilon closures (which is `new_dest_nodes') of
- the backreference to appropriate state_log. */
-#ifdef DEBUG
- assert (dfa->nexts[node_idx] != -1);
-#endif
- for (; bkc_idx < mctx->nbkref_ents; ++bkc_idx)
- {
- int subexp_len;
- re_dfastate_t *dest_state;
- struct re_backref_cache_entry *bkref_ent;
- bkref_ent = mctx->bkref_ents + bkc_idx;
- if (bkref_ent->node != node_idx || bkref_ent->str_idx != cur_str_idx)
- continue;
- subexp_len = bkref_ent->subexp_to - bkref_ent->subexp_from;
- new_dest_nodes = (subexp_len == 0
- ? dfa->eclosures + dfa->edests[node_idx].elems[0]
- : dfa->eclosures + dfa->nexts[node_idx]);
- dest_str_idx = (cur_str_idx + bkref_ent->subexp_to
- - bkref_ent->subexp_from);
- context = re_string_context_at (&mctx->input, dest_str_idx - 1,
- mctx->eflags);
- dest_state = mctx->state_log[dest_str_idx];
- prev_nelem = ((mctx->state_log[cur_str_idx] == NULL) ? 0
- : mctx->state_log[cur_str_idx]->nodes.nelem);
- /* Add `new_dest_node' to state_log. */
- if (dest_state == NULL)
- {
- mctx->state_log[dest_str_idx]
- = re_acquire_state_context (&err, dfa, new_dest_nodes,
- context);
- if (BE (mctx->state_log[dest_str_idx] == NULL
- && err != REG_NOERROR, 0))
- goto free_return;
- }
- else
- {
- re_node_set dest_nodes;
- err = re_node_set_init_union (&dest_nodes,
- dest_state->entrance_nodes,
- new_dest_nodes);
- if (BE (err != REG_NOERROR, 0))
- {
- re_node_set_free (&dest_nodes);
- goto free_return;
- }
- mctx->state_log[dest_str_idx]
- = re_acquire_state_context (&err, dfa, &dest_nodes, context);
- re_node_set_free (&dest_nodes);
- if (BE (mctx->state_log[dest_str_idx] == NULL
- && err != REG_NOERROR, 0))
- goto free_return;
- }
- /* We need to check recursively if the backreference can epsilon
- transit. */
- if (subexp_len == 0
- && mctx->state_log[cur_str_idx]->nodes.nelem > prev_nelem)
- {
- err = check_subexp_matching_top (mctx, new_dest_nodes,
- cur_str_idx);
- if (BE (err != REG_NOERROR, 0))
- goto free_return;
- err = transit_state_bkref (mctx, new_dest_nodes);
- if (BE (err != REG_NOERROR, 0))
- goto free_return;
- }
- }
- }
- err = REG_NOERROR;
- free_return:
- return err;
-}
-
-/* Enumerate all the candidates which the backreference BKREF_NODE can match
- at BKREF_STR_IDX, and register them by match_ctx_add_entry().
- Note that we might collect inappropriate candidates here.
- However, the cost of checking them strictly here is too high, then we
- delay these checking for prune_impossible_nodes(). */
-
-static reg_errcode_t
-internal_function
-get_subexp (re_match_context_t *mctx, int bkref_node, int bkref_str_idx)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- int subexp_num, sub_top_idx;
- const char *buf = (const char *) re_string_get_buffer (&mctx->input);
- /* Return if we have already checked BKREF_NODE at BKREF_STR_IDX. */
- int cache_idx = search_cur_bkref_entry (mctx, bkref_str_idx);
- if (cache_idx != -1)
- {
- const struct re_backref_cache_entry *entry
- = mctx->bkref_ents + cache_idx;
- do
- if (entry->node == bkref_node)
- return REG_NOERROR; /* We already checked it. */
- while (entry++->more);
- }
-
- subexp_num = dfa->nodes[bkref_node].opr.idx;
-
- /* For each sub expression */
- for (sub_top_idx = 0; sub_top_idx < mctx->nsub_tops; ++sub_top_idx)
- {
- reg_errcode_t err;
- re_sub_match_top_t *sub_top = mctx->sub_tops[sub_top_idx];
- re_sub_match_last_t *sub_last;
- int sub_last_idx, sl_str, bkref_str_off;
-
- if (dfa->nodes[sub_top->node].opr.idx != subexp_num)
- continue; /* It isn't related. */
-
- sl_str = sub_top->str_idx;
- bkref_str_off = bkref_str_idx;
- /* At first, check the last node of sub expressions we already
- evaluated. */
- for (sub_last_idx = 0; sub_last_idx < sub_top->nlasts; ++sub_last_idx)
- {
- int sl_str_diff;
- sub_last = sub_top->lasts[sub_last_idx];
- sl_str_diff = sub_last->str_idx - sl_str;
- /* The matched string by the sub expression match with the substring
- at the back reference? */
- if (sl_str_diff > 0)
- {
- if (BE (bkref_str_off + sl_str_diff > mctx->input.valid_len, 0))
- {
- /* Not enough chars for a successful match. */
- if (bkref_str_off + sl_str_diff > mctx->input.len)
- break;
-
- err = clean_state_log_if_needed (mctx,
- bkref_str_off
- + sl_str_diff);
- if (BE (err != REG_NOERROR, 0))
- return err;
- buf = (const char *) re_string_get_buffer (&mctx->input);
- }
- if (memcmp (buf + bkref_str_off, buf + sl_str, sl_str_diff) != 0)
- /* We don't need to search this sub expression any more. */
- break;
- }
- bkref_str_off += sl_str_diff;
- sl_str += sl_str_diff;
- err = get_subexp_sub (mctx, sub_top, sub_last, bkref_node,
- bkref_str_idx);
-
- /* Reload buf, since the preceding call might have reallocated
- the buffer. */
- buf = (const char *) re_string_get_buffer (&mctx->input);
-
- if (err == REG_NOMATCH)
- continue;
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
-
- if (sub_last_idx < sub_top->nlasts)
- continue;
- if (sub_last_idx > 0)
- ++sl_str;
- /* Then, search for the other last nodes of the sub expression. */
- for (; sl_str <= bkref_str_idx; ++sl_str)
- {
- int cls_node, sl_str_off;
- const re_node_set *nodes;
- sl_str_off = sl_str - sub_top->str_idx;
- /* The matched string by the sub expression match with the substring
- at the back reference? */
- if (sl_str_off > 0)
- {
- if (BE (bkref_str_off >= mctx->input.valid_len, 0))
- {
- /* If we are at the end of the input, we cannot match. */
- if (bkref_str_off >= mctx->input.len)
- break;
-
- err = extend_buffers (mctx);
- if (BE (err != REG_NOERROR, 0))
- return err;
-
- buf = (const char *) re_string_get_buffer (&mctx->input);
- }
- if (buf [bkref_str_off++] != buf[sl_str - 1])
- break; /* We don't need to search this sub expression
- any more. */
- }
- if (mctx->state_log[sl_str] == NULL)
- continue;
- /* Does this state have a ')' of the sub expression? */
- nodes = &mctx->state_log[sl_str]->nodes;
- cls_node = find_subexp_node (dfa, nodes, subexp_num,
- OP_CLOSE_SUBEXP);
- if (cls_node == -1)
- continue; /* No. */
- if (sub_top->path == NULL)
- {
- sub_top->path = calloc (sizeof (state_array_t),
- sl_str - sub_top->str_idx + 1);
- if (sub_top->path == NULL)
- return REG_ESPACE;
- }
- /* Can the OP_OPEN_SUBEXP node arrive the OP_CLOSE_SUBEXP node
- in the current context? */
- err = check_arrival (mctx, sub_top->path, sub_top->node,
- sub_top->str_idx, cls_node, sl_str,
- OP_CLOSE_SUBEXP);
- if (err == REG_NOMATCH)
- continue;
- if (BE (err != REG_NOERROR, 0))
- return err;
- sub_last = match_ctx_add_sublast (sub_top, cls_node, sl_str);
- if (BE (sub_last == NULL, 0))
- return REG_ESPACE;
- err = get_subexp_sub (mctx, sub_top, sub_last, bkref_node,
- bkref_str_idx);
- if (err == REG_NOMATCH)
- continue;
- }
- }
- return REG_NOERROR;
-}
-
-/* Helper functions for get_subexp(). */
-
-/* Check SUB_LAST can arrive to the back reference BKREF_NODE at BKREF_STR.
- If it can arrive, register the sub expression expressed with SUB_TOP
- and SUB_LAST. */
-
-static reg_errcode_t
-internal_function
-get_subexp_sub (re_match_context_t *mctx, const re_sub_match_top_t *sub_top,
- re_sub_match_last_t *sub_last, int bkref_node, int bkref_str)
-{
- reg_errcode_t err;
- int to_idx;
- /* Can the subexpression arrive the back reference? */
- err = check_arrival (mctx, &sub_last->path, sub_last->node,
- sub_last->str_idx, bkref_node, bkref_str,
- OP_OPEN_SUBEXP);
- if (err != REG_NOERROR)
- return err;
- err = match_ctx_add_entry (mctx, bkref_node, bkref_str, sub_top->str_idx,
- sub_last->str_idx);
- if (BE (err != REG_NOERROR, 0))
- return err;
- to_idx = bkref_str + sub_last->str_idx - sub_top->str_idx;
- return clean_state_log_if_needed (mctx, to_idx);
-}
-
-/* Find the first node which is '(' or ')' and whose index is SUBEXP_IDX.
- Search '(' if FL_OPEN, or search ')' otherwise.
- TODO: This function isn't efficient...
- Because there might be more than one nodes whose types are
- OP_OPEN_SUBEXP and whose index is SUBEXP_IDX, we must check all
- nodes.
- E.g. RE: (a){2} */
-
-static int
-internal_function
-find_subexp_node (const re_dfa_t *dfa, const re_node_set *nodes,
- int subexp_idx, int type)
-{
- int cls_idx;
- for (cls_idx = 0; cls_idx < nodes->nelem; ++cls_idx)
- {
- int cls_node = nodes->elems[cls_idx];
- const re_token_t *node = dfa->nodes + cls_node;
- if (node->type == type
- && node->opr.idx == subexp_idx)
- return cls_node;
- }
- return -1;
-}
-
-/* Check whether the node TOP_NODE at TOP_STR can arrive to the node
- LAST_NODE at LAST_STR. We record the path onto PATH since it will be
- heavily reused.
- Return REG_NOERROR if it can arrive, or REG_NOMATCH otherwise. */
-
-static reg_errcode_t
-internal_function
-check_arrival (re_match_context_t *mctx, state_array_t *path, int top_node,
- int top_str, int last_node, int last_str, int type)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- reg_errcode_t err = REG_NOERROR;
- int subexp_num, backup_cur_idx, str_idx, null_cnt;
- re_dfastate_t *cur_state = NULL;
- re_node_set *cur_nodes, next_nodes;
- re_dfastate_t **backup_state_log;
- unsigned int context;
-
- subexp_num = dfa->nodes[top_node].opr.idx;
- /* Extend the buffer if we need. */
- if (BE (path->alloc < last_str + mctx->max_mb_elem_len + 1, 0))
- {
- re_dfastate_t **new_array;
- int old_alloc = path->alloc;
- path->alloc += last_str + mctx->max_mb_elem_len + 1;
- new_array = re_realloc (path->array, re_dfastate_t *, path->alloc);
- if (BE (new_array == NULL, 0))
- {
- path->alloc = old_alloc;
- return REG_ESPACE;
- }
- path->array = new_array;
- memset (new_array + old_alloc, '\0',
- sizeof (re_dfastate_t *) * (path->alloc - old_alloc));
- }
-
- str_idx = path->next_idx ?: top_str;
-
- /* Temporary modify MCTX. */
- backup_state_log = mctx->state_log;
- backup_cur_idx = mctx->input.cur_idx;
- mctx->state_log = path->array;
- mctx->input.cur_idx = str_idx;
-
- /* Setup initial node set. */
- context = re_string_context_at (&mctx->input, str_idx - 1, mctx->eflags);
- if (str_idx == top_str)
- {
- err = re_node_set_init_1 (&next_nodes, top_node);
- if (BE (err != REG_NOERROR, 0))
- return err;
- err = check_arrival_expand_ecl (dfa, &next_nodes, subexp_num, type);
- if (BE (err != REG_NOERROR, 0))
- {
- re_node_set_free (&next_nodes);
- return err;
- }
- }
- else
- {
- cur_state = mctx->state_log[str_idx];
- if (cur_state && cur_state->has_backref)
- {
- err = re_node_set_init_copy (&next_nodes, &cur_state->nodes);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
- else
- re_node_set_init_empty (&next_nodes);
- }
- if (str_idx == top_str || (cur_state && cur_state->has_backref))
- {
- if (next_nodes.nelem)
- {
- err = expand_bkref_cache (mctx, &next_nodes, str_idx,
- subexp_num, type);
- if (BE (err != REG_NOERROR, 0))
- {
- re_node_set_free (&next_nodes);
- return err;
- }
- }
- cur_state = re_acquire_state_context (&err, dfa, &next_nodes, context);
- if (BE (cur_state == NULL && err != REG_NOERROR, 0))
- {
- re_node_set_free (&next_nodes);
- return err;
- }
- mctx->state_log[str_idx] = cur_state;
- }
-
- for (null_cnt = 0; str_idx < last_str && null_cnt <= mctx->max_mb_elem_len;)
- {
- re_node_set_empty (&next_nodes);
- if (mctx->state_log[str_idx + 1])
- {
- err = re_node_set_merge (&next_nodes,
- &mctx->state_log[str_idx + 1]->nodes);
- if (BE (err != REG_NOERROR, 0))
- {
- re_node_set_free (&next_nodes);
- return err;
- }
- }
- if (cur_state)
- {
- err = check_arrival_add_next_nodes (mctx, str_idx,
- &cur_state->non_eps_nodes,
- &next_nodes);
- if (BE (err != REG_NOERROR, 0))
- {
- re_node_set_free (&next_nodes);
- return err;
- }
- }
- ++str_idx;
- if (next_nodes.nelem)
- {
- err = check_arrival_expand_ecl (dfa, &next_nodes, subexp_num, type);
- if (BE (err != REG_NOERROR, 0))
- {
- re_node_set_free (&next_nodes);
- return err;
- }
- err = expand_bkref_cache (mctx, &next_nodes, str_idx,
- subexp_num, type);
- if (BE (err != REG_NOERROR, 0))
- {
- re_node_set_free (&next_nodes);
- return err;
- }
- }
- context = re_string_context_at (&mctx->input, str_idx - 1, mctx->eflags);
- cur_state = re_acquire_state_context (&err, dfa, &next_nodes, context);
- if (BE (cur_state == NULL && err != REG_NOERROR, 0))
- {
- re_node_set_free (&next_nodes);
- return err;
- }
- mctx->state_log[str_idx] = cur_state;
- null_cnt = cur_state == NULL ? null_cnt + 1 : 0;
- }
- re_node_set_free (&next_nodes);
- cur_nodes = (mctx->state_log[last_str] == NULL ? NULL
- : &mctx->state_log[last_str]->nodes);
- path->next_idx = str_idx;
-
- /* Fix MCTX. */
- mctx->state_log = backup_state_log;
- mctx->input.cur_idx = backup_cur_idx;
-
- /* Then check the current node set has the node LAST_NODE. */
- if (cur_nodes != NULL && re_node_set_contains (cur_nodes, last_node))
- return REG_NOERROR;
-
- return REG_NOMATCH;
-}
-
-/* Helper functions for check_arrival. */
-
-/* Calculate the destination nodes of CUR_NODES at STR_IDX, and append them
- to NEXT_NODES.
- TODO: This function is similar to the functions transit_state*(),
- however this function has many additional works.
- Can't we unify them? */
-
-static reg_errcode_t
-internal_function
-check_arrival_add_next_nodes (re_match_context_t *mctx, int str_idx,
- re_node_set *cur_nodes, re_node_set *next_nodes)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- int result;
- int cur_idx;
- reg_errcode_t err = REG_NOERROR;
- re_node_set union_set;
- re_node_set_init_empty (&union_set);
- for (cur_idx = 0; cur_idx < cur_nodes->nelem; ++cur_idx)
- {
- int naccepted = 0;
- int cur_node = cur_nodes->elems[cur_idx];
-#ifdef DEBUG
- re_token_type_t type = dfa->nodes[cur_node].type;
- assert (!IS_EPSILON_NODE (type));
-#endif
-#ifdef RE_ENABLE_I18N
- /* If the node may accept `multi byte'. */
- if (dfa->nodes[cur_node].accept_mb)
- {
- naccepted = check_node_accept_bytes (dfa, cur_node, &mctx->input,
- str_idx);
- if (naccepted > 1)
- {
- re_dfastate_t *dest_state;
- int next_node = dfa->nexts[cur_node];
- int next_idx = str_idx + naccepted;
- dest_state = mctx->state_log[next_idx];
- re_node_set_empty (&union_set);
- if (dest_state)
- {
- err = re_node_set_merge (&union_set, &dest_state->nodes);
- if (BE (err != REG_NOERROR, 0))
- {
- re_node_set_free (&union_set);
- return err;
- }
- }
- result = re_node_set_insert (&union_set, next_node);
- if (BE (result < 0, 0))
- {
- re_node_set_free (&union_set);
- return REG_ESPACE;
- }
- mctx->state_log[next_idx] = re_acquire_state (&err, dfa,
- &union_set);
- if (BE (mctx->state_log[next_idx] == NULL
- && err != REG_NOERROR, 0))
- {
- re_node_set_free (&union_set);
- return err;
- }
- }
- }
-#endif /* RE_ENABLE_I18N */
- if (naccepted
- || check_node_accept (mctx, dfa->nodes + cur_node, str_idx))
- {
- result = re_node_set_insert (next_nodes, dfa->nexts[cur_node]);
- if (BE (result < 0, 0))
- {
- re_node_set_free (&union_set);
- return REG_ESPACE;
- }
- }
- }
- re_node_set_free (&union_set);
- return REG_NOERROR;
-}
-
-/* For all the nodes in CUR_NODES, add the epsilon closures of them to
- CUR_NODES, however exclude the nodes which are:
- - inside the sub expression whose number is EX_SUBEXP, if FL_OPEN.
- - out of the sub expression whose number is EX_SUBEXP, if !FL_OPEN.
-*/
-
-static reg_errcode_t
-internal_function
-check_arrival_expand_ecl (const re_dfa_t *dfa, re_node_set *cur_nodes,
- int ex_subexp, int type)
-{
- reg_errcode_t err;
- int idx, outside_node;
- re_node_set new_nodes;
-#ifdef DEBUG
- assert (cur_nodes->nelem);
-#endif
- err = re_node_set_alloc (&new_nodes, cur_nodes->nelem);
- if (BE (err != REG_NOERROR, 0))
- return err;
- /* Create a new node set NEW_NODES with the nodes which are epsilon
- closures of the node in CUR_NODES. */
-
- for (idx = 0; idx < cur_nodes->nelem; ++idx)
- {
- int cur_node = cur_nodes->elems[idx];
- const re_node_set *eclosure = dfa->eclosures + cur_node;
- outside_node = find_subexp_node (dfa, eclosure, ex_subexp, type);
- if (outside_node == -1)
- {
- /* There are no problematic nodes, just merge them. */
- err = re_node_set_merge (&new_nodes, eclosure);
- if (BE (err != REG_NOERROR, 0))
- {
- re_node_set_free (&new_nodes);
- return err;
- }
- }
- else
- {
- /* There are problematic nodes, re-calculate incrementally. */
- err = check_arrival_expand_ecl_sub (dfa, &new_nodes, cur_node,
- ex_subexp, type);
- if (BE (err != REG_NOERROR, 0))
- {
- re_node_set_free (&new_nodes);
- return err;
- }
- }
- }
- re_node_set_free (cur_nodes);
- *cur_nodes = new_nodes;
- return REG_NOERROR;
-}
-
-/* Helper function for check_arrival_expand_ecl.
- Check incrementally the epsilon closure of TARGET, and if it isn't
- problematic append it to DST_NODES. */
-
-static reg_errcode_t
-internal_function
-check_arrival_expand_ecl_sub (const re_dfa_t *dfa, re_node_set *dst_nodes,
- int target, int ex_subexp, int type)
-{
- int cur_node;
- for (cur_node = target; !re_node_set_contains (dst_nodes, cur_node);)
- {
- int err;
-
- if (dfa->nodes[cur_node].type == type
- && dfa->nodes[cur_node].opr.idx == ex_subexp)
- {
- if (type == OP_CLOSE_SUBEXP)
- {
- err = re_node_set_insert (dst_nodes, cur_node);
- if (BE (err == -1, 0))
- return REG_ESPACE;
- }
- break;
- }
- err = re_node_set_insert (dst_nodes, cur_node);
- if (BE (err == -1, 0))
- return REG_ESPACE;
- if (dfa->edests[cur_node].nelem == 0)
- break;
- if (dfa->edests[cur_node].nelem == 2)
- {
- err = check_arrival_expand_ecl_sub (dfa, dst_nodes,
- dfa->edests[cur_node].elems[1],
- ex_subexp, type);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
- cur_node = dfa->edests[cur_node].elems[0];
- }
- return REG_NOERROR;
-}
-
-
-/* For all the back references in the current state, calculate the
- destination of the back references by the appropriate entry
- in MCTX->BKREF_ENTS. */
-
-static reg_errcode_t
-internal_function
-expand_bkref_cache (re_match_context_t *mctx, re_node_set *cur_nodes,
- int cur_str, int subexp_num, int type)
-{
- const re_dfa_t *const dfa = mctx->dfa;
- reg_errcode_t err;
- int cache_idx_start = search_cur_bkref_entry (mctx, cur_str);
- struct re_backref_cache_entry *ent;
-
- if (cache_idx_start == -1)
- return REG_NOERROR;
-
- restart:
- ent = mctx->bkref_ents + cache_idx_start;
- do
- {
- int to_idx, next_node;
-
- /* Is this entry ENT is appropriate? */
- if (!re_node_set_contains (cur_nodes, ent->node))
- continue; /* No. */
-
- to_idx = cur_str + ent->subexp_to - ent->subexp_from;
- /* Calculate the destination of the back reference, and append it
- to MCTX->STATE_LOG. */
- if (to_idx == cur_str)
- {
- /* The backreference did epsilon transit, we must re-check all the
- node in the current state. */
- re_node_set new_dests;
- reg_errcode_t err2, err3;
- next_node = dfa->edests[ent->node].elems[0];
- if (re_node_set_contains (cur_nodes, next_node))
- continue;
- err = re_node_set_init_1 (&new_dests, next_node);
- err2 = check_arrival_expand_ecl (dfa, &new_dests, subexp_num, type);
- err3 = re_node_set_merge (cur_nodes, &new_dests);
- re_node_set_free (&new_dests);
- if (BE (err != REG_NOERROR || err2 != REG_NOERROR
- || err3 != REG_NOERROR, 0))
- {
- err = (err != REG_NOERROR ? err
- : (err2 != REG_NOERROR ? err2 : err3));
- return err;
- }
- /* TODO: It is still inefficient... */
- goto restart;
- }
- else
- {
- re_node_set union_set;
- next_node = dfa->nexts[ent->node];
- if (mctx->state_log[to_idx])
- {
- int ret;
- if (re_node_set_contains (&mctx->state_log[to_idx]->nodes,
- next_node))
- continue;
- err = re_node_set_init_copy (&union_set,
- &mctx->state_log[to_idx]->nodes);
- ret = re_node_set_insert (&union_set, next_node);
- if (BE (err != REG_NOERROR || ret < 0, 0))
- {
- re_node_set_free (&union_set);
- err = err != REG_NOERROR ? err : REG_ESPACE;
- return err;
- }
- }
- else
- {
- err = re_node_set_init_1 (&union_set, next_node);
- if (BE (err != REG_NOERROR, 0))
- return err;
- }
- mctx->state_log[to_idx] = re_acquire_state (&err, dfa, &union_set);
- re_node_set_free (&union_set);
- if (BE (mctx->state_log[to_idx] == NULL
- && err != REG_NOERROR, 0))
- return err;
- }
- }
- while (ent++->more);
- return REG_NOERROR;
-}
-
-/* Build transition table for the state.
- Return 1 if succeeded, otherwise return NULL. */
-
-static int
-internal_function
-build_trtable (const re_dfa_t *dfa, re_dfastate_t *state)
-{
- reg_errcode_t err;
- int i, j, ch, need_word_trtable = 0;
- bitset_word_t elem, mask;
- bool dests_node_malloced = false;
- bool dest_states_malloced = false;
- int ndests; /* Number of the destination states from `state'. */
- re_dfastate_t **trtable;
- re_dfastate_t **dest_states = NULL, **dest_states_word, **dest_states_nl;
- re_node_set follows, *dests_node;
- bitset_t *dests_ch;
- bitset_t acceptable;
-
- struct dests_alloc
- {
- re_node_set dests_node[SBC_MAX];
- bitset_t dests_ch[SBC_MAX];
- } *dests_alloc;
-
- /* We build DFA states which corresponds to the destination nodes
- from `state'. `dests_node[i]' represents the nodes which i-th
- destination state contains, and `dests_ch[i]' represents the
- characters which i-th destination state accepts. */
- if (__libc_use_alloca (sizeof (struct dests_alloc)))
- dests_alloc = (struct dests_alloc *) alloca (sizeof (struct dests_alloc));
- else
- {
- dests_alloc = re_malloc (struct dests_alloc, 1);
- if (BE (dests_alloc == NULL, 0))
- return 0;
- dests_node_malloced = true;
- }
- dests_node = dests_alloc->dests_node;
- dests_ch = dests_alloc->dests_ch;
-
- /* Initialize transiton table. */
- state->word_trtable = state->trtable = NULL;
-
- /* At first, group all nodes belonging to `state' into several
- destinations. */
- ndests = group_nodes_into_DFAstates (dfa, state, dests_node, dests_ch);
- if (BE (ndests <= 0, 0))
- {
- if (dests_node_malloced)
- free (dests_alloc);
- /* Return 0 in case of an error, 1 otherwise. */
- if (ndests == 0)
- {
- state->trtable = (re_dfastate_t **)
- calloc (sizeof (re_dfastate_t *), SBC_MAX);
- return 1;
- }
- return 0;
- }
-
- err = re_node_set_alloc (&follows, ndests + 1);
- if (BE (err != REG_NOERROR, 0))
- goto out_free;
-
- if (__libc_use_alloca ((sizeof (re_node_set) + sizeof (bitset_t)) * SBC_MAX
- + ndests * 3 * sizeof (re_dfastate_t *)))
- dest_states = (re_dfastate_t **)
- alloca (ndests * 3 * sizeof (re_dfastate_t *));
- else
- {
- dest_states = (re_dfastate_t **)
- malloc (ndests * 3 * sizeof (re_dfastate_t *));
- if (BE (dest_states == NULL, 0))
- {
-out_free:
- if (dest_states_malloced)
- free (dest_states);
- re_node_set_free (&follows);
- for (i = 0; i < ndests; ++i)
- re_node_set_free (dests_node + i);
- if (dests_node_malloced)
- free (dests_alloc);
- return 0;
- }
- dest_states_malloced = true;
- }
- dest_states_word = dest_states + ndests;
- dest_states_nl = dest_states_word + ndests;
- bitset_empty (acceptable);
-
- /* Then build the states for all destinations. */
- for (i = 0; i < ndests; ++i)
- {
- int next_node;
- re_node_set_empty (&follows);
- /* Merge the follows of this destination states. */
- for (j = 0; j < dests_node[i].nelem; ++j)
- {
- next_node = dfa->nexts[dests_node[i].elems[j]];
- if (next_node != -1)
- {
- err = re_node_set_merge (&follows, dfa->eclosures + next_node);
- if (BE (err != REG_NOERROR, 0))
- goto out_free;
- }
- }
- dest_states[i] = re_acquire_state_context (&err, dfa, &follows, 0);
- if (BE (dest_states[i] == NULL && err != REG_NOERROR, 0))
- goto out_free;
- /* If the new state has context constraint,
- build appropriate states for these contexts. */
- if (dest_states[i]->has_constraint)
- {
- dest_states_word[i] = re_acquire_state_context (&err, dfa, &follows,
- CONTEXT_WORD);
- if (BE (dest_states_word[i] == NULL && err != REG_NOERROR, 0))
- goto out_free;
-
- if (dest_states[i] != dest_states_word[i] && dfa->mb_cur_max > 1)
- need_word_trtable = 1;
-
- dest_states_nl[i] = re_acquire_state_context (&err, dfa, &follows,
- CONTEXT_NEWLINE);
- if (BE (dest_states_nl[i] == NULL && err != REG_NOERROR, 0))
- goto out_free;
- }
- else
- {
- dest_states_word[i] = dest_states[i];
- dest_states_nl[i] = dest_states[i];
- }
- bitset_merge (acceptable, dests_ch[i]);
- }
-
- if (!BE (need_word_trtable, 0))
- {
- /* We don't care about whether the following character is a word
- character, or we are in a single-byte character set so we can
- discern by looking at the character code: allocate a
- 256-entry transition table. */
- trtable = state->trtable =
- (re_dfastate_t **) calloc (sizeof (re_dfastate_t *), SBC_MAX);
- if (BE (trtable == NULL, 0))
- goto out_free;
-
- /* For all characters ch...: */
- for (i = 0; i < BITSET_WORDS; ++i)
- for (ch = i * BITSET_WORD_BITS, elem = acceptable[i], mask = 1;
- elem;
- mask <<= 1, elem >>= 1, ++ch)
- if (BE (elem & 1, 0))
- {
- /* There must be exactly one destination which accepts
- character ch. See group_nodes_into_DFAstates. */
- for (j = 0; (dests_ch[j][i] & mask) == 0; ++j)
- ;
-
- /* j-th destination accepts the word character ch. */
- if (dfa->word_char[i] & mask)
- trtable[ch] = dest_states_word[j];
- else
- trtable[ch] = dest_states[j];
- }
- }
- else
- {
- /* We care about whether the following character is a word
- character, and we are in a multi-byte character set: discern
- by looking at the character code: build two 256-entry
- transition tables, one starting at trtable[0] and one
- starting at trtable[SBC_MAX]. */
- trtable = state->word_trtable =
- (re_dfastate_t **) calloc (sizeof (re_dfastate_t *), 2 * SBC_MAX);
- if (BE (trtable == NULL, 0))
- goto out_free;
-
- /* For all characters ch...: */
- for (i = 0; i < BITSET_WORDS; ++i)
- for (ch = i * BITSET_WORD_BITS, elem = acceptable[i], mask = 1;
- elem;
- mask <<= 1, elem >>= 1, ++ch)
- if (BE (elem & 1, 0))
- {
- /* There must be exactly one destination which accepts
- character ch. See group_nodes_into_DFAstates. */
- for (j = 0; (dests_ch[j][i] & mask) == 0; ++j)
- ;
-
- /* j-th destination accepts the word character ch. */
- trtable[ch] = dest_states[j];
- trtable[ch + SBC_MAX] = dest_states_word[j];
- }
- }
-
- /* new line */
- if (bitset_contain (acceptable, NEWLINE_CHAR))
- {
- /* The current state accepts newline character. */
- for (j = 0; j < ndests; ++j)
- if (bitset_contain (dests_ch[j], NEWLINE_CHAR))
- {
- /* k-th destination accepts newline character. */
- trtable[NEWLINE_CHAR] = dest_states_nl[j];
- if (need_word_trtable)
- trtable[NEWLINE_CHAR + SBC_MAX] = dest_states_nl[j];
- /* There must be only one destination which accepts
- newline. See group_nodes_into_DFAstates. */
- break;
- }
- }
-
- if (dest_states_malloced)
- free (dest_states);
-
- re_node_set_free (&follows);
- for (i = 0; i < ndests; ++i)
- re_node_set_free (dests_node + i);
-
- if (dests_node_malloced)
- free (dests_alloc);
-
- return 1;
-}
-
-/* Group all nodes belonging to STATE into several destinations.
- Then for all destinations, set the nodes belonging to the destination
- to DESTS_NODE[i] and set the characters accepted by the destination
- to DEST_CH[i]. This function return the number of destinations. */
-
-static int
-internal_function
-group_nodes_into_DFAstates (const re_dfa_t *dfa, const re_dfastate_t *state,
- re_node_set *dests_node, bitset_t *dests_ch)
-{
- reg_errcode_t err;
- int result;
- int i, j, k;
- int ndests; /* Number of the destinations from `state'. */
- bitset_t accepts; /* Characters a node can accept. */
- const re_node_set *cur_nodes = &state->nodes;
- bitset_empty (accepts);
- ndests = 0;
-
- /* For all the nodes belonging to `state', */
- for (i = 0; i < cur_nodes->nelem; ++i)
- {
- re_token_t *node = &dfa->nodes[cur_nodes->elems[i]];
- re_token_type_t type = node->type;
- unsigned int constraint = node->constraint;
-
- /* Enumerate all single byte character this node can accept. */
- if (type == CHARACTER)
- bitset_set (accepts, node->opr.c);
- else if (type == SIMPLE_BRACKET)
- {
- bitset_merge (accepts, node->opr.sbcset);
- }
- else if (type == OP_PERIOD)
- {
-#ifdef RE_ENABLE_I18N
- if (dfa->mb_cur_max > 1)
- bitset_merge (accepts, dfa->sb_char);
- else
-#endif
- bitset_set_all (accepts);
- if (!(dfa->syntax & RE_DOT_NEWLINE))
- bitset_clear (accepts, '\n');
- if (dfa->syntax & RE_DOT_NOT_NULL)
- bitset_clear (accepts, '\0');
- }
-#ifdef RE_ENABLE_I18N
- else if (type == OP_UTF8_PERIOD)
- {
- memset (accepts, '\xff', sizeof (bitset_t) / 2);
- if (!(dfa->syntax & RE_DOT_NEWLINE))
- bitset_clear (accepts, '\n');
- if (dfa->syntax & RE_DOT_NOT_NULL)
- bitset_clear (accepts, '\0');
- }
-#endif
- else
- continue;
-
- /* Check the `accepts' and sift the characters which are not
- match it the context. */
- if (constraint)
- {
- if (constraint & NEXT_NEWLINE_CONSTRAINT)
- {
- bool accepts_newline = bitset_contain (accepts, NEWLINE_CHAR);
- bitset_empty (accepts);
- if (accepts_newline)
- bitset_set (accepts, NEWLINE_CHAR);
- else
- continue;
- }
- if (constraint & NEXT_ENDBUF_CONSTRAINT)
- {
- bitset_empty (accepts);
- continue;
- }
-
- if (constraint & NEXT_WORD_CONSTRAINT)
- {
- bitset_word_t any_set = 0;
- if (type == CHARACTER && !node->word_char)
- {
- bitset_empty (accepts);
- continue;
- }
-#ifdef RE_ENABLE_I18N
- if (dfa->mb_cur_max > 1)
- for (j = 0; j < BITSET_WORDS; ++j)
- any_set |= (accepts[j] &= (dfa->word_char[j] | ~dfa->sb_char[j]));
- else
-#endif
- for (j = 0; j < BITSET_WORDS; ++j)
- any_set |= (accepts[j] &= dfa->word_char[j]);
- if (!any_set)
- continue;
- }
- if (constraint & NEXT_NOTWORD_CONSTRAINT)
- {
- bitset_word_t any_set = 0;
- if (type == CHARACTER && node->word_char)
- {
- bitset_empty (accepts);
- continue;
- }
-#ifdef RE_ENABLE_I18N
- if (dfa->mb_cur_max > 1)
- for (j = 0; j < BITSET_WORDS; ++j)
- any_set |= (accepts[j] &= ~(dfa->word_char[j] & dfa->sb_char[j]));
- else
-#endif
- for (j = 0; j < BITSET_WORDS; ++j)
- any_set |= (accepts[j] &= ~dfa->word_char[j]);
- if (!any_set)
- continue;
- }
- }
-
- /* Then divide `accepts' into DFA states, or create a new
- state. Above, we make sure that accepts is not empty. */
- for (j = 0; j < ndests; ++j)
- {
- bitset_t intersec; /* Intersection sets, see below. */
- bitset_t remains;
- /* Flags, see below. */
- bitset_word_t has_intersec, not_subset, not_consumed;
-
- /* Optimization, skip if this state doesn't accept the character. */
- if (type == CHARACTER && !bitset_contain (dests_ch[j], node->opr.c))
- continue;
-
- /* Enumerate the intersection set of this state and `accepts'. */
- has_intersec = 0;
- for (k = 0; k < BITSET_WORDS; ++k)
- has_intersec |= intersec[k] = accepts[k] & dests_ch[j][k];
- /* And skip if the intersection set is empty. */
- if (!has_intersec)
- continue;
-
- /* Then check if this state is a subset of `accepts'. */
- not_subset = not_consumed = 0;
- for (k = 0; k < BITSET_WORDS; ++k)
- {
- not_subset |= remains[k] = ~accepts[k] & dests_ch[j][k];
- not_consumed |= accepts[k] = accepts[k] & ~dests_ch[j][k];
- }
-
- /* If this state isn't a subset of `accepts', create a
- new group state, which has the `remains'. */
- if (not_subset)
- {
- bitset_copy (dests_ch[ndests], remains);
- bitset_copy (dests_ch[j], intersec);
- err = re_node_set_init_copy (dests_node + ndests, &dests_node[j]);
- if (BE (err != REG_NOERROR, 0))
- goto error_return;
- ++ndests;
- }
-
- /* Put the position in the current group. */
- result = re_node_set_insert (&dests_node[j], cur_nodes->elems[i]);
- if (BE (result < 0, 0))
- goto error_return;
-
- /* If all characters are consumed, go to next node. */
- if (!not_consumed)
- break;
- }
- /* Some characters remain, create a new group. */
- if (j == ndests)
- {
- bitset_copy (dests_ch[ndests], accepts);
- err = re_node_set_init_1 (dests_node + ndests, cur_nodes->elems[i]);
- if (BE (err != REG_NOERROR, 0))
- goto error_return;
- ++ndests;
- bitset_empty (accepts);
- }
- }
- return ndests;
- error_return:
- for (j = 0; j < ndests; ++j)
- re_node_set_free (dests_node + j);
- return -1;
-}
-
-#ifdef RE_ENABLE_I18N
-/* Check how many bytes the node `dfa->nodes[node_idx]' accepts.
- Return the number of the bytes the node accepts.
- STR_IDX is the current index of the input string.
-
- This function handles the nodes which can accept one character, or
- one collating element like '.', '[a-z]', opposite to the other nodes
- can only accept one byte. */
-
-static int
-internal_function
-check_node_accept_bytes (const re_dfa_t *dfa, int node_idx,
- const re_string_t *input, int str_idx)
-{
- const re_token_t *node = dfa->nodes + node_idx;
- int char_len, elem_len;
- int i;
-
- if (BE (node->type == OP_UTF8_PERIOD, 0))
- {
- unsigned char c = re_string_byte_at (input, str_idx), d;
- if (BE (c < 0xc2, 1))
- return 0;
-
- if (str_idx + 2 > input->len)
- return 0;
-
- d = re_string_byte_at (input, str_idx + 1);
- if (c < 0xe0)
- return (d < 0x80 || d > 0xbf) ? 0 : 2;
- else if (c < 0xf0)
- {
- char_len = 3;
- if (c == 0xe0 && d < 0xa0)
- return 0;
- }
- else if (c < 0xf8)
- {
- char_len = 4;
- if (c == 0xf0 && d < 0x90)
- return 0;
- }
- else if (c < 0xfc)
- {
- char_len = 5;
- if (c == 0xf8 && d < 0x88)
- return 0;
- }
- else if (c < 0xfe)
- {
- char_len = 6;
- if (c == 0xfc && d < 0x84)
- return 0;
- }
- else
- return 0;
-
- if (str_idx + char_len > input->len)
- return 0;
-
- for (i = 1; i < char_len; ++i)
- {
- d = re_string_byte_at (input, str_idx + i);
- if (d < 0x80 || d > 0xbf)
- return 0;
- }
- return char_len;
- }
-
- char_len = re_string_char_size_at (input, str_idx);
- if (node->type == OP_PERIOD)
- {
- if (char_len <= 1)
- return 0;
- /* FIXME: I don't think this if is needed, as both '\n'
- and '\0' are char_len == 1. */
- /* '.' accepts any one character except the following two cases. */
- if ((!(dfa->syntax & RE_DOT_NEWLINE) &&
- re_string_byte_at (input, str_idx) == '\n') ||
- ((dfa->syntax & RE_DOT_NOT_NULL) &&
- re_string_byte_at (input, str_idx) == '\0'))
- return 0;
- return char_len;
- }
-
- elem_len = re_string_elem_size_at (input, str_idx);
- if ((elem_len <= 1 && char_len <= 1) || char_len == 0)
- return 0;
-
- if (node->type == COMPLEX_BRACKET)
- {
- const re_charset_t *cset = node->opr.mbcset;
-# ifdef _LIBC
- const unsigned char *pin
- = ((const unsigned char *) re_string_get_buffer (input) + str_idx);
- int j;
- uint32_t nrules;
-# endif /* _LIBC */
- int match_len = 0;
- wchar_t wc = ((cset->nranges || cset->nchar_classes || cset->nmbchars)
- ? re_string_wchar_at (input, str_idx) : 0);
-
- /* match with multibyte character? */
- for (i = 0; i < cset->nmbchars; ++i)
- if (wc == cset->mbchars[i])
- {
- match_len = char_len;
- goto check_node_accept_bytes_match;
- }
- /* match with character_class? */
- for (i = 0; i < cset->nchar_classes; ++i)
- {
- wctype_t wt = cset->char_classes[i];
- if (__iswctype (wc, wt))
- {
- match_len = char_len;
- goto check_node_accept_bytes_match;
- }
- }
-
-# ifdef _LIBC
- nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
- if (nrules != 0)
- {
- unsigned int in_collseq = 0;
- const int32_t *table, *indirect;
- const unsigned char *weights, *extra;
- const char *collseqwc;
- /* This #include defines a local function! */
-# include <locale/weight.h>
-
- /* match with collating_symbol? */
- if (cset->ncoll_syms)
- extra = (const unsigned char *)
- _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB);
- for (i = 0; i < cset->ncoll_syms; ++i)
- {
- const unsigned char *coll_sym = extra + cset->coll_syms[i];
- /* Compare the length of input collating element and
- the length of current collating element. */
- if (*coll_sym != elem_len)
- continue;
- /* Compare each bytes. */
- for (j = 0; j < *coll_sym; j++)
- if (pin[j] != coll_sym[1 + j])
- break;
- if (j == *coll_sym)
- {
- /* Match if every bytes is equal. */
- match_len = j;
- goto check_node_accept_bytes_match;
- }
- }
-
- if (cset->nranges)
- {
- if (elem_len <= char_len)
- {
- collseqwc = _NL_CURRENT (LC_COLLATE, _NL_COLLATE_COLLSEQWC);
- in_collseq = __collseq_table_lookup (collseqwc, wc);
- }
- else
- in_collseq = find_collation_sequence_value (pin, elem_len);
- }
- /* match with range expression? */
- for (i = 0; i < cset->nranges; ++i)
- if (cset->range_starts[i] <= in_collseq
- && in_collseq <= cset->range_ends[i])
- {
- match_len = elem_len;
- goto check_node_accept_bytes_match;
- }
-
- /* match with equivalence_class? */
- if (cset->nequiv_classes)
- {
- const unsigned char *cp = pin;
- table = (const int32_t *)
- _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB);
- weights = (const unsigned char *)
- _NL_CURRENT (LC_COLLATE, _NL_COLLATE_WEIGHTMB);
- extra = (const unsigned char *)
- _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB);
- indirect = (const int32_t *)
- _NL_CURRENT (LC_COLLATE, _NL_COLLATE_INDIRECTMB);
- int32_t idx = findidx (&cp);
- if (idx > 0)
- for (i = 0; i < cset->nequiv_classes; ++i)
- {
- int32_t equiv_class_idx = cset->equiv_classes[i];
- size_t weight_len = weights[idx & 0xffffff];
- if (weight_len == weights[equiv_class_idx & 0xffffff]
- && (idx >> 24) == (equiv_class_idx >> 24))
- {
- int cnt = 0;
-
- idx &= 0xffffff;
- equiv_class_idx &= 0xffffff;
-
- while (cnt <= weight_len
- && (weights[equiv_class_idx + 1 + cnt]
- == weights[idx + 1 + cnt]))
- ++cnt;
- if (cnt > weight_len)
- {
- match_len = elem_len;
- goto check_node_accept_bytes_match;
- }
- }
- }
- }
- }
- else
-# endif /* _LIBC */
- {
- /* match with range expression? */
-#if __GNUC__ >= 2
- wchar_t cmp_buf[] = {L'\0', L'\0', wc, L'\0', L'\0', L'\0'};
-#else
- wchar_t cmp_buf[] = {L'\0', L'\0', L'\0', L'\0', L'\0', L'\0'};
- cmp_buf[2] = wc;
-#endif
- for (i = 0; i < cset->nranges; ++i)
- {
- cmp_buf[0] = cset->range_starts[i];
- cmp_buf[4] = cset->range_ends[i];
- if (wcscoll (cmp_buf, cmp_buf + 2) <= 0
- && wcscoll (cmp_buf + 2, cmp_buf + 4) <= 0)
- {
- match_len = char_len;
- goto check_node_accept_bytes_match;
- }
- }
- }
- check_node_accept_bytes_match:
- if (!cset->non_match)
- return match_len;
- else
- {
- if (match_len > 0)
- return 0;
- else
- return (elem_len > char_len) ? elem_len : char_len;
- }
- }
- return 0;
-}
-
-# ifdef _LIBC
-static unsigned int
-internal_function
-find_collation_sequence_value (const unsigned char *mbs, size_t mbs_len)
-{
- uint32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
- if (nrules == 0)
- {
- if (mbs_len == 1)
- {
- /* No valid character. Match it as a single byte character. */
- const unsigned char *collseq = (const unsigned char *)
- _NL_CURRENT (LC_COLLATE, _NL_COLLATE_COLLSEQMB);
- return collseq[mbs[0]];
- }
- return UINT_MAX;
- }
- else
- {
- int32_t idx;
- const unsigned char *extra = (const unsigned char *)
- _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB);
- int32_t extrasize = (const unsigned char *)
- _NL_CURRENT (LC_COLLATE, _NL_COLLATE_SYMB_EXTRAMB + 1) - extra;
-
- for (idx = 0; idx < extrasize;)
- {
- int mbs_cnt, found = 0;
- int32_t elem_mbs_len;
- /* Skip the name of collating element name. */
- idx = idx + extra[idx] + 1;
- elem_mbs_len = extra[idx++];
- if (mbs_len == elem_mbs_len)
- {
- for (mbs_cnt = 0; mbs_cnt < elem_mbs_len; ++mbs_cnt)
- if (extra[idx + mbs_cnt] != mbs[mbs_cnt])
- break;
- if (mbs_cnt == elem_mbs_len)
- /* Found the entry. */
- found = 1;
- }
- /* Skip the byte sequence of the collating element. */
- idx += elem_mbs_len;
- /* Adjust for the alignment. */
- idx = (idx + 3) & ~3;
- /* Skip the collation sequence value. */
- idx += sizeof (uint32_t);
- /* Skip the wide char sequence of the collating element. */
- idx = idx + sizeof (uint32_t) * (extra[idx] + 1);
- /* If we found the entry, return the sequence value. */
- if (found)
- return *(uint32_t *) (extra + idx);
- /* Skip the collation sequence value. */
- idx += sizeof (uint32_t);
- }
- return UINT_MAX;
- }
-}
-# endif /* _LIBC */
-#endif /* RE_ENABLE_I18N */
-
-/* Check whether the node accepts the byte which is IDX-th
- byte of the INPUT. */
-
-static int
-internal_function
-check_node_accept (const re_match_context_t *mctx, const re_token_t *node,
- int idx)
-{
- unsigned char ch;
- ch = re_string_byte_at (&mctx->input, idx);
- switch (node->type)
- {
- case CHARACTER:
- if (node->opr.c != ch)
- return 0;
- break;
-
- case SIMPLE_BRACKET:
- if (!bitset_contain (node->opr.sbcset, ch))
- return 0;
- break;
-
-#ifdef RE_ENABLE_I18N
- case OP_UTF8_PERIOD:
- if (ch >= 0x80)
- return 0;
- /* FALLTHROUGH */
-#endif
- case OP_PERIOD:
- if ((ch == '\n' && !(mctx->dfa->syntax & RE_DOT_NEWLINE))
- || (ch == '\0' && (mctx->dfa->syntax & RE_DOT_NOT_NULL)))
- return 0;
- break;
-
- default:
- return 0;
- }
-
- if (node->constraint)
- {
- /* The node has constraints. Check whether the current context
- satisfies the constraints. */
- unsigned int context = re_string_context_at (&mctx->input, idx,
- mctx->eflags);
- if (NOT_SATISFY_NEXT_CONSTRAINT (node->constraint, context))
- return 0;
- }
-
- return 1;
-}
-
-/* Extend the buffers, if the buffers have run out. */
-
-static reg_errcode_t
-internal_function
-extend_buffers (re_match_context_t *mctx)
-{
- reg_errcode_t ret;
- re_string_t *pstr = &mctx->input;
-
- /* Double the lengthes of the buffers. */
- ret = re_string_realloc_buffers (pstr, pstr->bufs_len * 2);
- if (BE (ret != REG_NOERROR, 0))
- return ret;
-
- if (mctx->state_log != NULL)
- {
- /* And double the length of state_log. */
- /* XXX We have no indication of the size of this buffer. If this
- allocation fail we have no indication that the state_log array
- does not have the right size. */
- re_dfastate_t **new_array = re_realloc (mctx->state_log, re_dfastate_t *,
- pstr->bufs_len + 1);
- if (BE (new_array == NULL, 0))
- return REG_ESPACE;
- mctx->state_log = new_array;
- }
-
- /* Then reconstruct the buffers. */
- if (pstr->icase)
- {
-#ifdef RE_ENABLE_I18N
- if (pstr->mb_cur_max > 1)
- {
- ret = build_wcs_upper_buffer (pstr);
- if (BE (ret != REG_NOERROR, 0))
- return ret;
- }
- else
-#endif /* RE_ENABLE_I18N */
- build_upper_buffer (pstr);
- }
- else
- {
-#ifdef RE_ENABLE_I18N
- if (pstr->mb_cur_max > 1)
- build_wcs_buffer (pstr);
- else
-#endif /* RE_ENABLE_I18N */
- {
- if (pstr->trans != NULL)
- re_string_translate_buffer (pstr);
- }
- }
- return REG_NOERROR;
-}
-
-
-/* Functions for matching context. */
-
-/* Initialize MCTX. */
-
-static reg_errcode_t
-internal_function
-match_ctx_init (re_match_context_t *mctx, int eflags, int n)
-{
- mctx->eflags = eflags;
- mctx->match_last = -1;
- if (n > 0)
- {
- mctx->bkref_ents = re_malloc (struct re_backref_cache_entry, n);
- mctx->sub_tops = re_malloc (re_sub_match_top_t *, n);
- if (BE (mctx->bkref_ents == NULL || mctx->sub_tops == NULL, 0))
- return REG_ESPACE;
- }
- /* Already zero-ed by the caller.
- else
- mctx->bkref_ents = NULL;
- mctx->nbkref_ents = 0;
- mctx->nsub_tops = 0; */
- mctx->abkref_ents = n;
- mctx->max_mb_elem_len = 1;
- mctx->asub_tops = n;
- return REG_NOERROR;
-}
-
-/* Clean the entries which depend on the current input in MCTX.
- This function must be invoked when the matcher changes the start index
- of the input, or changes the input string. */
-
-static void
-internal_function
-match_ctx_clean (re_match_context_t *mctx)
-{
- int st_idx;
- for (st_idx = 0; st_idx < mctx->nsub_tops; ++st_idx)
- {
- int sl_idx;
- re_sub_match_top_t *top = mctx->sub_tops[st_idx];
- for (sl_idx = 0; sl_idx < top->nlasts; ++sl_idx)
- {
- re_sub_match_last_t *last = top->lasts[sl_idx];
- re_free (last->path.array);
- re_free (last);
- }
- re_free (top->lasts);
- if (top->path)
- {
- re_free (top->path->array);
- re_free (top->path);
- }
- free (top);
- }
-
- mctx->nsub_tops = 0;
- mctx->nbkref_ents = 0;
-}
-
-/* Free all the memory associated with MCTX. */
-
-static void
-internal_function
-match_ctx_free (re_match_context_t *mctx)
-{
- /* First, free all the memory associated with MCTX->SUB_TOPS. */
- match_ctx_clean (mctx);
- re_free (mctx->sub_tops);
- re_free (mctx->bkref_ents);
-}
-
-/* Add a new backreference entry to MCTX.
- Note that we assume that caller never call this function with duplicate
- entry, and call with STR_IDX which isn't smaller than any existing entry.
-*/
-
-static reg_errcode_t
-internal_function
-match_ctx_add_entry (re_match_context_t *mctx, int node, int str_idx, int from,
- int to)
-{
- if (mctx->nbkref_ents >= mctx->abkref_ents)
- {
- struct re_backref_cache_entry* new_entry;
- new_entry = re_realloc (mctx->bkref_ents, struct re_backref_cache_entry,
- mctx->abkref_ents * 2);
- if (BE (new_entry == NULL, 0))
- {
- re_free (mctx->bkref_ents);
- return REG_ESPACE;
- }
- mctx->bkref_ents = new_entry;
- memset (mctx->bkref_ents + mctx->nbkref_ents, '\0',
- sizeof (struct re_backref_cache_entry) * mctx->abkref_ents);
- mctx->abkref_ents *= 2;
- }
- if (mctx->nbkref_ents > 0
- && mctx->bkref_ents[mctx->nbkref_ents - 1].str_idx == str_idx)
- mctx->bkref_ents[mctx->nbkref_ents - 1].more = 1;
-
- mctx->bkref_ents[mctx->nbkref_ents].node = node;
- mctx->bkref_ents[mctx->nbkref_ents].str_idx = str_idx;
- mctx->bkref_ents[mctx->nbkref_ents].subexp_from = from;
- mctx->bkref_ents[mctx->nbkref_ents].subexp_to = to;
-
- /* This is a cache that saves negative results of check_dst_limits_calc_pos.
- If bit N is clear, means that this entry won't epsilon-transition to
- an OP_OPEN_SUBEXP or OP_CLOSE_SUBEXP for the N+1-th subexpression. If
- it is set, check_dst_limits_calc_pos_1 will recurse and try to find one
- such node.
-
- A backreference does not epsilon-transition unless it is empty, so set
- to all zeros if FROM != TO. */
- mctx->bkref_ents[mctx->nbkref_ents].eps_reachable_subexps_map
- = (from == to ? ~0 : 0);
-
- mctx->bkref_ents[mctx->nbkref_ents++].more = 0;
- if (mctx->max_mb_elem_len < to - from)
- mctx->max_mb_elem_len = to - from;
- return REG_NOERROR;
-}
-
-/* Search for the first entry which has the same str_idx, or -1 if none is
- found. Note that MCTX->BKREF_ENTS is already sorted by MCTX->STR_IDX. */
-
-static int
-internal_function
-search_cur_bkref_entry (const re_match_context_t *mctx, int str_idx)
-{
- int left, right, mid, last;
- last = right = mctx->nbkref_ents;
- for (left = 0; left < right;)
- {
- mid = (left + right) / 2;
- if (mctx->bkref_ents[mid].str_idx < str_idx)
- left = mid + 1;
- else
- right = mid;
- }
- if (left < last && mctx->bkref_ents[left].str_idx == str_idx)
- return left;
- else
- return -1;
-}
-
-/* Register the node NODE, whose type is OP_OPEN_SUBEXP, and which matches
- at STR_IDX. */
-
-static reg_errcode_t
-internal_function
-match_ctx_add_subtop (re_match_context_t *mctx, int node, int str_idx)
-{
-#ifdef DEBUG
- assert (mctx->sub_tops != NULL);
- assert (mctx->asub_tops > 0);
-#endif
- if (BE (mctx->nsub_tops == mctx->asub_tops, 0))
- {
- int new_asub_tops = mctx->asub_tops * 2;
- re_sub_match_top_t **new_array = re_realloc (mctx->sub_tops,
- re_sub_match_top_t *,
- new_asub_tops);
- if (BE (new_array == NULL, 0))
- return REG_ESPACE;
- mctx->sub_tops = new_array;
- mctx->asub_tops = new_asub_tops;
- }
- mctx->sub_tops[mctx->nsub_tops] = calloc (1, sizeof (re_sub_match_top_t));
- if (BE (mctx->sub_tops[mctx->nsub_tops] == NULL, 0))
- return REG_ESPACE;
- mctx->sub_tops[mctx->nsub_tops]->node = node;
- mctx->sub_tops[mctx->nsub_tops++]->str_idx = str_idx;
- return REG_NOERROR;
-}
-
-/* Register the node NODE, whose type is OP_CLOSE_SUBEXP, and which matches
- at STR_IDX, whose corresponding OP_OPEN_SUBEXP is SUB_TOP. */
-
-static re_sub_match_last_t *
-internal_function
-match_ctx_add_sublast (re_sub_match_top_t *subtop, int node, int str_idx)
-{
- re_sub_match_last_t *new_entry;
- if (BE (subtop->nlasts == subtop->alasts, 0))
- {
- int new_alasts = 2 * subtop->alasts + 1;
- re_sub_match_last_t **new_array = re_realloc (subtop->lasts,
- re_sub_match_last_t *,
- new_alasts);
- if (BE (new_array == NULL, 0))
- return NULL;
- subtop->lasts = new_array;
- subtop->alasts = new_alasts;
- }
- new_entry = calloc (1, sizeof (re_sub_match_last_t));
- if (BE (new_entry != NULL, 1))
- {
- subtop->lasts[subtop->nlasts] = new_entry;
- new_entry->node = node;
- new_entry->str_idx = str_idx;
- ++subtop->nlasts;
- }
- return new_entry;
-}
-
-static void
-internal_function
-sift_ctx_init (re_sift_context_t *sctx, re_dfastate_t **sifted_sts,
- re_dfastate_t **limited_sts, int last_node, int last_str_idx)
-{
- sctx->sifted_states = sifted_sts;
- sctx->limited_states = limited_sts;
- sctx->last_node = last_node;
- sctx->last_str_idx = last_str_idx;
- re_node_set_init_empty (&sctx->limits);
-}
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