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/*
* vercmp.c - Compare package version numbers using pacman's version
* comparison logic
*
* Copyright (c) 2006-2017 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 <stdlib.h>
#include <stdio.h> /* printf */
#include <string.h>
/* forward declaration, comes from version.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(void)
{
fprintf(stderr, "vercmp (pacman) v" PACKAGE_VERSION "\n\n"
"Compare package version numbers using pacman's version comparison logic.\n\n"
"Usage: vercmp <ver1> <ver2>\n\n"
"Output values:\n"
" < 0 : if ver1 < ver2\n"
" 0 : if ver1 == ver2\n"
" > 0 : if ver1 > ver2\n");
}
int main(int argc, char *argv[])
{
const char *s1 = "";
const char *s2 = "";
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 > 2) {
s2 = argv[2];
}
if(argc > 1) {
s1 = argv[1];
}
ret = alpm_pkg_vercmp(s1, s2);
printf("%d\n", ret);
return EXIT_SUCCESS;
}
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