src/util/vercmp.c


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/*
 *  vercmp.c
 *
 *  Copyright (c) 2006-2010 Pacman Development Team <pacman-dev@archlinux.org>
 *  Copyright (c) 2002-2005 by Judd Vinet <jvinet@zeroflux.org>
 *
 *  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 of the License, 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, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <stdio.h> /* printf */
#include <string.h> /* strncpy */

#define BASENAME "vercmp"

#define MAX_LEN 255

/* forward declaration, comes from vercmp.o in libalpm source that is linked in
 * directly so we don't have any library deps */
int alpm_pkg_vercmp(const char *a, const char *b);

static void usage()
{
        fprintf(stderr, "usage: %s <ver1> <ver2>\n\n", BASENAME);
        fprintf(stderr, "return values:\n");
        fprintf(stderr, "  < 0 : if ver1 < ver2\n");
        fprintf(stderr, "    0 : if ver1 == ver2\n");
        fprintf(stderr, "  > 0 : if ver1 > ver2\n");
}

int main(int argc, char *argv[])
{
        char s1[MAX_LEN] = "";
        char s2[MAX_LEN] = "";
        int ret;

        if(argc == 1) {
                usage();
                return(2);
        }
        if(argc > 1 &&
                        (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0
                         || strcmp(argv[1], "--usage") == 0)) {
                usage();
                return(0);
        }
        if(argc > 1) {
                strncpy(s1, argv[1], MAX_LEN);
                s1[MAX_LEN -1] = '\0';
        }
        if(argc > 2) {
                strncpy(s2, argv[2], MAX_LEN);
                s2[MAX_LEN -1] = '\0';
        } else {
                printf("0\n");
                return(0);
        }

        ret = alpm_pkg_vercmp(s1, s2);
        printf("%d\n", ret);
        return(ret);
}