util-linux/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  * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
   7  *
   8  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
   9  *
  10  * Based on which from debianutils
  11  */
  12
  13 #include "libbb.h"
  14
  15 int which_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  16 int which_main(int argc UNUSED_PARAM, char **argv)
  17 {
  18         IF_DESKTOP(int opt;)
  19         int status = EXIT_SUCCESS;
  20         char *path;
  21         char *p;
  22
  23         opt_complementary = "-1"; /* at least one argument */
  24         IF_DESKTOP(opt =) getopt32(argv, "a");
  25         argv += optind;
  26
  27         /* This matches what is seen on e.g. ubuntu.
  28          * "which" there is a shell script. */
  29         path = getenv("PATH");
  30         if (!path) {
  31                 path = (char*)bb_PATH_root_path;
  32                 putenv(path);
  33                 path += 5; /* skip "PATH=" */
  34         }
  35
  36         do {
  37 #if ENABLE_DESKTOP
  38 /* Much bloat just to support -a */
  39                 if (strchr(*argv, '/')) {
  40                         if (execable_file(*argv)) {
  41                                 puts(*argv);
  42                                 continue;
  43                         }
  44                         status = EXIT_FAILURE;
  45                 } else {
  46                         char *path2 = xstrdup(path);
  47                         char *tmp = path2;
  48
  49                         p = find_execable(*argv, &tmp);
  50                         if (!p)
  51                                 status = EXIT_FAILURE;
  52                         else {
  53  print:
  54                                 puts(p);
  55                                 free(p);
  56                                 if (opt) {
  57                                         /* -a: show matches in all PATH components */
  58                                         if (tmp) {
  59                                                 p = find_execable(*argv, &tmp);
  60                                                 if (p)
  61                                                         goto print;
  62                                         }
  63                                 }
  64                         }
  65                         free(path2);
  66                 }
  67 #else
  68 /* Just ignoring -a */
  69                 if (strchr(*argv, '/')) {
  70                         if (execable_file(*argv)) {
  71                                 puts(*argv);
  72                                 continue;
  73                         }
  74                 } else {
  75                         char *path2 = xstrdup(path);
  76                         char *tmp = path2;
  77                         p = find_execable(*argv, &tmp);
  78                         free(path2);
  79                         if (p) {
  80                                 puts(p);
  81                                 free(p);
  82                                 continue;
  83                         }
  84                 }
  85                 status = EXIT_FAILURE;
  86 #endif
  87         } while (*(++argv) != NULL);
  88
  89         fflush_stdout_and_exit(status);
  90 }