debianutils/which.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   4  * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
   5  *
   6  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   7  */
   8
   9 //usage:#define which_trivial_usage
  10 //usage:       "[COMMAND]..."
  11 //usage:#define which_full_usage "\n\n"
  12 //usage:       "Locate a COMMAND"
  13 //usage:
  14 //usage:#define which_example_usage
  15 //usage:       "$ which login\n"
  16 //usage:       "/bin/login\n"
  17
  18 #include "libbb.h"
  19
  20 int which_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  21 int which_main(int argc UNUSED_PARAM, char **argv)
  22 {
  23         const char *env_path;
  24         int status = 0;
  25
  26         env_path = getenv("PATH");
  27         if (!env_path)
  28                 env_path = bb_default_root_path;
  29
  30         opt_complementary = "-1"; /* at least one argument */
  31         getopt32(argv, "a");
  32         argv += optind;
  33
  34         do {
  35                 int missing = 1;
  36
  37                 /* If file contains a slash don't use PATH */
  38                 if (strchr(*argv, '/')) {
  39                         if (file_is_executable(*argv)) {
  40                                 missing = 0;
  41                                 puts(*argv);
  42                         }
  43                 } else {
  44                         char *path;
  45                         char *tmp;
  46                         char *p;
  47
  48                         path = tmp = xstrdup(env_path);
  49                         while ((p = find_executable(*argv, &tmp)) != NULL) {
  50                                 missing = 0;
  51                                 puts(p);
  52                                 free(p);
  53                                 if (!option_mask32) /* -a not set */
  54                                         break;
  55                         }
  56                         free(path);
  57                 }
  58                 status |= missing;
  59         } while (*++argv);
  60
  61         return status;
  62 }