src/util/vercmp.c

   1 /*
   2  *  vercmp.c
   3  *
   4  *  Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org>
   5  *  Copyright (c) 2002-2005 by Judd Vinet <jvinet@zeroflux.org>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <stdlib.h>
  22 #include <stdio.h> /* printf */
  23 #include <string.h>
  24
  25 #define BASENAME "vercmp"
  26
  27 /* forward declaration, comes from version.o in libalpm source that is linked
  28  * in directly so we don't have any library deps */
  29 int alpm_pkg_vercmp(const char *a, const char *b);
  30
  31 static void usage(void)
  32 {
  33         fprintf(stderr, "usage: %s <ver1> <ver2>\n\n", BASENAME);
  34         fprintf(stderr, "output values:\n");
  35         fprintf(stderr, "  < 0 : if ver1 < ver2\n");
  36         fprintf(stderr, "    0 : if ver1 == ver2\n");
  37         fprintf(stderr, "  > 0 : if ver1 > ver2\n");
  38 }
  39
  40 int main(int argc, char *argv[])
  41 {
  42         const char *s1 = "";
  43         const char *s2 = "";
  44         int ret;
  45
  46         if(argc == 1) {
  47                 usage();
  48                 return 2;
  49         }
  50         if(argc > 1 &&
  51                         (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0
  52                          || strcmp(argv[1], "--usage") == 0)) {
  53                 usage();
  54                 return 0;
  55         }
  56         if(argc > 2) {
  57                 s2 = argv[2];
  58         }
  59         if(argc > 1) {
  60                 s1 = argv[1];
  61         }
  62
  63         ret = alpm_pkg_vercmp(s1, s2);
  64         printf("%d\n", ret);
  65         return EXIT_SUCCESS;
  66 }