1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Which implementation for busybox
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4 | *
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5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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6 | * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
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7 | *
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8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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9 | *
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10 | * Based on which from debianutils
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11 | */
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12 |
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13 | //usage:#define which_trivial_usage
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14 | //usage: "[COMMAND]..."
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15 | //usage:#define which_full_usage "\n\n"
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16 | //usage: "Locate a COMMAND"
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17 | //usage:
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18 | //usage:#define which_example_usage
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19 | //usage: "$ which login\n"
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20 | //usage: "/bin/login\n"
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21 |
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22 | #include "libbb.h"
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23 |
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24 | int which_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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25 | int which_main(int argc UNUSED_PARAM, char **argv)
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26 | {
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27 | IF_DESKTOP(int opt;)
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28 | int status = EXIT_SUCCESS;
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29 | char *path;
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30 | char *p;
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31 |
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32 | opt_complementary = "-1"; /* at least one argument */
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33 | IF_DESKTOP(opt =) getopt32(argv, "a");
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34 | argv += optind;
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35 |
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36 | /* This matches what is seen on e.g. ubuntu.
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37 | * "which" there is a shell script. */
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38 | path = getenv("PATH");
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39 | if (!path) {
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40 | path = (char*)bb_PATH_root_path;
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41 | putenv(path);
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42 | path += 5; /* skip "PATH=" */
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43 | }
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44 |
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45 | do {
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46 | #if ENABLE_DESKTOP
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47 | /* Much bloat just to support -a */
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48 | if (strchr(*argv, '/')) {
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49 | if (execable_file(*argv)) {
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50 | puts(*argv);
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51 | continue;
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52 | }
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53 | status = EXIT_FAILURE;
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54 | } else {
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55 | char *path2 = xstrdup(path);
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56 | char *tmp = path2;
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57 |
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58 | p = find_execable(*argv, &tmp);
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59 | if (!p)
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60 | status = EXIT_FAILURE;
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61 | else {
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62 | print:
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63 | puts(p);
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64 | free(p);
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65 | if (opt) {
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66 | /* -a: show matches in all PATH components */
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67 | if (tmp) {
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68 | p = find_execable(*argv, &tmp);
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69 | if (p)
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70 | goto print;
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71 | }
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72 | }
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73 | }
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74 | free(path2);
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75 | }
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76 | #else
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77 | /* Just ignoring -a */
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78 | if (strchr(*argv, '/')) {
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79 | if (execable_file(*argv)) {
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80 | puts(*argv);
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81 | continue;
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82 | }
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83 | } else {
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84 | char *path2 = xstrdup(path);
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85 | char *tmp = path2;
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86 | p = find_execable(*argv, &tmp);
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87 | free(path2);
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88 | if (p) {
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89 | puts(p);
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90 | free(p);
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91 | continue;
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92 | }
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93 | }
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94 | status = EXIT_FAILURE;
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95 | #endif
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96 | } while (*(++argv) != NULL);
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97 |
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98 | fflush_stdout_and_exit(status);
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99 | }
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