no13.c

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/******************************************************************************
 *
 *  no13.c -    Strips ascii 13 chars out of a file
 *
 * $Id: no13.c 2833 2013-06-29 06:40:28Z chrislit $
 *
 * Copyright 1996-2013 CrossWire Bible Society (http://www.crosswire.org)
 *  CrossWire Bible Society
 *  P. O. Box 2528
 *  Tempe, AZ  85280-2528
 *
 * 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 version 2.
 *
 * 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.
 *
 */
#include <fcntl.h>
#include <stdio.h>

main(int argc, char **argv)
{
    int fd, loop;
    char ch;
    char breakcnt = 0;

    if (argc != 2) {
        fprintf(stderr, "This program writes to stdout, so to be useful,\n\tit should be redirected (e.g no13 bla > bla.dat)\nusage: %s <filename>\n", argv[0]);
        exit(1);
    }
    fd = open(argv[1], O_RDONLY, S_IREAD|S_IWRITE|S_IRGRP|S_IROTH);
    while (read(fd, &ch, 1) == 1) {
        if (ch == 0x0d) {   // CR
            breakcnt++;
            continue;
        }
        if (ch == 0x1a) // Ctrl-Z
            continue;

        if (ch != 0x0a) {   // LF
            if (breakcnt > 1) {
                for (loop = breakcnt; loop > 0; loop--)
                    putchar(0x0d);
                putchar(0x0a);
            }
            breakcnt=0;
        }
        putchar(ch);
    }
    close(fd);
}