swversion.cpp

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/******************************************************************************
 *
 *  swversion.cpp - SWVersion: version number utility class
 *
 * $Id: swversion.cpp 2980 2013-09-14 21:51:47Z scribe $
 *
 * Copyright 2001-2013 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 <swversion.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


SWORD_NAMESPACE_START


SWVersion SWVersion::currentVersion( SWORD_VERSION_STR );


/******************************************************************************
 * SWVersion c-tor - Constructs a new SWVersion
 *
 * ENT: version - const version string
 */

SWVersion::SWVersion(const char *version) {
    char *buf = new char[ strlen(version) + 1 ];
    char *tok;
    major = minor = minor2 = minor3 = -1;
        
    strcpy(buf, version);
    tok = strtok(buf, ".");
    if (tok)
        major = atoi(tok);
    tok = strtok(0, ".");
    if (tok)
        minor = atoi(tok);
    tok = strtok(0, ".");
    if (tok)
        minor2 = atoi(tok);
    tok = strtok(0, ".");
    if (tok)
        minor3 = atoi(tok);
    delete [] buf;
}


/******************************************************************************
 * compare - compares this version to another version
 *
 * ENT: vi  - other version with which to compare
 *
 * RET: = 0 if equal;
 *      < 0 if this version is less than other version;
 *      > 0 if this version is greater than other version
 */

int SWVersion::compare(const SWVersion &vi) const {
    if (major == vi.major)
        if (minor == vi.minor)
            if (minor2 == vi.minor2)
                if (minor3 == vi.minor3)
                    return 0;
                else return minor3 - vi.minor3;
            else    return minor2 - vi.minor2;
        else    return minor - vi.minor;
    else    return major - vi.major;
}


const char *SWVersion::getText() const {

    // 255 is safe because there is no way 4 integers (plus 3 '.'s) can have
    // a string representation that will overrun this buffer
    static char buf[255];

    if (minor > -1) {
        if (minor2 > -1) {
            if (minor3 > -1) {
                sprintf(buf, "%d.%d.%d.%d", major, minor, minor2, minor3);
            }
            else    sprintf(buf, "%d.%d.%d", major, minor, minor2);
        }
        else    sprintf(buf, "%d.%d", major, minor);
    }
    else    sprintf(buf, "%d", major);

    return buf;
}


SWORD_NAMESPACE_END