debianutils/which.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Which implementation for busybox
   4  *
   5  * Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.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 GNU
  15  * 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, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  *
  21  */
  22
  23 /* getopt not needed */
  24 #include <string.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include "busybox.h"
  28
  29 extern int which_main(int argc, char **argv)
  30 {
  31         char *path_list, *path_n;
  32         struct stat filestat;
  33         int i, count=1, found, status = EXIT_SUCCESS;
  34
  35         if (argc <= 1 || **(argv + 1) == '-')
  36                 bb_show_usage();
  37         argc--;
  38
  39         path_list = getenv("PATH");
  40         if (path_list != NULL) {
  41                 for(i=strlen(path_list); i > 0; i--)
  42                         if (path_list[i]==':') {
  43                                 path_list[i]=0;
  44                                 count++;
  45                         }
  46         } else {
  47                 path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin";
  48                 count = 5;
  49         }
  50
  51         while(argc-- > 0) {
  52                 path_n = path_list;
  53                 argv++;
  54                 found = 0;
  55                 for (i = 0; i < count; i++) {
  56                         char *buf;
  57                         buf = concat_path_file(path_n, *argv);
  58                         if (stat (buf, &filestat) == 0
  59                             && filestat.st_mode & S_IXUSR)
  60                         {
  61                                 puts(buf);
  62                                 found = 1;
  63                                 break;
  64                         }
  65                         free(buf);
  66                         path_n += (strlen(path_n) + 1);
  67                 }
  68                 if (!found)
  69                         status = EXIT_FAILURE;
  70         }
  71         return status;
  72 }
  73
  74 /*
  75 Local Variables:
  76 c-file-style: "linux"
  77 c-basic-offset: 4
  78 tab-width: 4
  79 End:
  80 */