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 static int file_exists(char *file)
  30 {
  31         struct stat filestat;
  32
  33         if (stat(file, &filestat) == 0 && filestat.st_mode & S_IXUSR)
  34                 return 1;
  35         else
  36                 return 0;
  37 }
  38
  39 extern int which_main(int argc, char **argv)
  40 {
  41         char *path_list, *path_n;
  42         int i, count=1, found, status = EXIT_SUCCESS;
  43
  44         if (argc <= 1 || **(argv + 1) == '-')
  45                 bb_show_usage();
  46         argc--;
  47
  48         path_list = getenv("PATH");
  49         if (path_list != NULL) {
  50                 for(i=strlen(path_list); i > 0; i--)
  51                         if (path_list[i]==':') {
  52                                 path_list[i]=0;
  53                                 count++;
  54                         }
  55         } else {
  56                 path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin";
  57                 count = 5;
  58         }
  59
  60         while(argc-- > 0) {
  61                 char *buf;
  62                 path_n = path_list;
  63                 argv++;
  64                 found = 0;
  65
  66                 /*
  67                  * Check if we were given the full path, first.
  68                  * Otherwise see if the file exists in our $PATH.
  69                  */
  70                 buf = *argv;
  71                 if (file_exists(buf)) {
  72                         puts(buf);
  73                         found = 1;
  74                 } else {
  75                         for (i = 0; i < count; i++) {
  76                                 buf = concat_path_file(path_n, *argv);
  77                                 if (file_exists(buf)) {
  78                                         puts(buf);
  79                                         found = 1;
  80                                         break;
  81                                 }
  82                                 free(buf);
  83                                 path_n += (strlen(path_n) + 1);
  84                         }
  85                 }
  86                 if (!found)
  87                         status = EXIT_FAILURE;
  88         }
  89         return status;
  90 }
  91
  92 /*
  93 Local Variables:
  94 c-file-style: "linux"
  95 c-basic-offset: 4
  96 tab-width: 4
  97 End:
  98 */