blob: 15fd598b782f7076ab59dbf27730518affaf3d0c
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 GPLv2 or later, see file LICENSE in this source tree. |
9 | * |
10 | * Based on which from debianutils |
11 | */ |
12 | |
13 | //usage:#define which_trivial_usage |
14 | //usage: "[COMMAND]..." |
15 | //usage:#define which_full_usage "\n\n" |
16 | //usage: "Locate a COMMAND" |
17 | //usage: |
18 | //usage:#define which_example_usage |
19 | //usage: "$ which login\n" |
20 | //usage: "/bin/login\n" |
21 | |
22 | #include "libbb.h" |
23 | |
24 | int which_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
25 | int which_main(int argc UNUSED_PARAM, char **argv) |
26 | { |
27 | IF_DESKTOP(int opt;) |
28 | int status = EXIT_SUCCESS; |
29 | char *path; |
30 | char *p; |
31 | |
32 | opt_complementary = "-1"; /* at least one argument */ |
33 | IF_DESKTOP(opt =) getopt32(argv, "a"); |
34 | argv += optind; |
35 | |
36 | /* This matches what is seen on e.g. ubuntu. |
37 | * "which" there is a shell script. */ |
38 | path = getenv("PATH"); |
39 | if (!path) { |
40 | path = (char*)bb_PATH_root_path; |
41 | putenv(path); |
42 | path += 5; /* skip "PATH=" */ |
43 | } |
44 | |
45 | do { |
46 | #if ENABLE_DESKTOP |
47 | /* Much bloat just to support -a */ |
48 | if (strchr(*argv, '/')) { |
49 | if (execable_file(*argv)) { |
50 | puts(*argv); |
51 | continue; |
52 | } |
53 | status = EXIT_FAILURE; |
54 | } else { |
55 | char *path2 = xstrdup(path); |
56 | char *tmp = path2; |
57 | |
58 | p = find_execable(*argv, &tmp); |
59 | if (!p) |
60 | status = EXIT_FAILURE; |
61 | else { |
62 | print: |
63 | puts(p); |
64 | free(p); |
65 | if (opt) { |
66 | /* -a: show matches in all PATH components */ |
67 | if (tmp) { |
68 | p = find_execable(*argv, &tmp); |
69 | if (p) |
70 | goto print; |
71 | } |
72 | } |
73 | } |
74 | free(path2); |
75 | } |
76 | #else |
77 | /* Just ignoring -a */ |
78 | if (strchr(*argv, '/')) { |
79 | if (execable_file(*argv)) { |
80 | puts(*argv); |
81 | continue; |
82 | } |
83 | } else { |
84 | char *path2 = xstrdup(path); |
85 | char *tmp = path2; |
86 | p = find_execable(*argv, &tmp); |
87 | free(path2); |
88 | if (p) { |
89 | puts(p); |
90 | free(p); |
91 | continue; |
92 | } |
93 | } |
94 | status = EXIT_FAILURE; |
95 | #endif |
96 | } while (*(++argv) != NULL); |
97 | |
98 | fflush_stdout_and_exit(status); |
99 | } |
100 |