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 /* We shouldn't do this. Ever. Not our business.
  26         if (!getenv("PATH")) {
  27                 putenv((char*)bb_PATH_root_path);
  28         }
  29 */
  30
  31         while (--argc > 0) {
  32                 argv++;
  33                 if (strchr(*argv, '/')) {
  34                         if (execable_file(*argv)) {
  35                                 puts(*argv);
  36                                 continue;
  37                         }
  38                 } else {
  39                         p = find_execable(*argv);
  40                         if (p) {
  41                                 puts(p);
  42                                 free(p);
  43                                 continue;
  44                         }
  45                 }
  46                 status = EXIT_FAILURE;
  47         }
  48
  49         fflush_stdout_and_exit(status);
  50 }