debianutils/which.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Which implementation for busybox
   4  *
   5  * Copyright (C) 1999-2004 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  * Based on which from debianutils
  22  */
  23
  24
  25 #include <string.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <unistd.h>
  29
  30 #include "busybox.h"
  31
  32
  33 extern int which_main(int argc, char **argv)
  34 {
  35         char *path_list;
  36         int i, count=1, status = EXIT_SUCCESS;
  37
  38         if (argc <= 1 || **(argv + 1) == '-') {
  39                 bb_show_usage();
  40         }
  41         argc--;
  42
  43         path_list = getenv("PATH");
  44         if (path_list != NULL) {
  45                 for (i=strlen(path_list); i > 0; i--) {
  46                         if (path_list[i]==':') {
  47                                 path_list[i]=0;
  48                                 count++;
  49                         }
  50                 }
  51         } else {
  52                 path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin";
  53                 count = 5;
  54         }
  55
  56         while (argc-- > 0) {
  57                 char *buf;
  58                 char *path_n;
  59                 char found = 0;
  60                 argv++;
  61
  62                 /*
  63                  * Check if we were given the full path, first.
  64                  * Otherwise see if the file exists in our $PATH.
  65                  */
  66                 path_n = path_list;
  67                 buf = *argv;
  68                 if (access(buf, X_OK) == 0) {
  69                         found = 1;
  70                 } else {
  71                         for (i = 0; i < count; i++) {
  72                                 buf = concat_path_file(path_n, *argv);
  73                                 if (access(buf, X_OK) == 0) {
  74                                         found = 1;
  75                                         break;
  76                                 }
  77                                 free(buf);
  78                                 path_n += (strlen(path_n) + 1);
  79                         }
  80                 }
  81                 if (found) {
  82                         puts(buf);
  83                 } else {
  84                         status = EXIT_FAILURE;
  85                 }
  86         }
  87         return status;
  88 }
  89
  90 /*
  91 Local Variables:
  92 c-file-style: "linux"
  93 c-basic-offset: 4
  94 tab-width: 4
  95 End:
  96 */