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);
  16 int which_main(int argc, char **argv)
  17 {
  18         int status = EXIT_SUCCESS;
  19         char *p;
  20
  21         if (argc <= 1 || argv[1][0] == '-') {
  22                 bb_show_usage();
  23         }
  24
  25         if (!getenv("PATH")) {
  26                 setenv("PATH", "/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin", 1);
  27         }
  28
  29         while (--argc > 0) {
  30                 argv++;
  31                 if (strchr(*argv, '/')) {
  32                         if (execable_file(*argv)) {
  33                                 puts(*argv);
  34                                 continue;
  35                         }
  36                 } else {
  37                         p = find_execable(*argv);
  38                         if (p) {
  39                                 puts(p);
  40                                 free(p);
  41                                 continue;
  42                         }
  43                 }
  44                 status = EXIT_FAILURE;
  45         }
  46
  47         fflush_stdout_and_exit(status);
  48 }