1 /* vi: set sw=4 ts=4: */
2 /*
3 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
4 * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
5 *
6 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
7 */
8 //config:config WHICH
9 //config: bool "which (3.8 kb)"
10 //config: default y
11 //config: help
12 //config: which is used to find programs in your PATH and
13 //config: print out their pathnames.
14
15 //applet:IF_WHICH(APPLET_NOFORK(which, which, BB_DIR_USR_BIN, BB_SUID_DROP, which))
16
17 //kbuild:lib-$(CONFIG_WHICH) += which.o
18
19 //usage:#define which_trivial_usage
20 //usage: "[-a] COMMAND..."
21 //usage:#define which_full_usage "\n\n"
22 //usage: "Locate COMMAND\n"
23 //usage: "\n -a Show all matches"
24 //usage:
25 //usage:#define which_example_usage
26 //usage: "$ which login\n"
27 //usage: "/bin/login\n"
28
29 #include "libbb.h"
30
31 int which_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
which_main(int argc UNUSED_PARAM,char ** argv)32 int which_main(int argc UNUSED_PARAM, char **argv)
33 {
34 char *env_path;
35 int status = 0;
36 /* This sizeof(): bb_default_root_path is shorter than BB_PATH_ROOT_PATH */
37 char buf[sizeof(BB_PATH_ROOT_PATH)];
38
39 env_path = getenv("PATH");
40 if (!env_path)
41 /* env_path must be writable, and must not alloc, so... */
42 env_path = strcpy(buf, bb_default_root_path);
43
44 getopt32(argv, "^" "a" "\0" "-1"/*at least one arg*/);
45 argv += optind;
46
47 do {
48 int missing = 1;
49
50 /* If file contains a slash don't use PATH */
51 if (strchr(*argv, '/')) {
52 if (file_is_executable(*argv)) {
53 missing = 0;
54 puts(*argv);
55 }
56 } else {
57 char *path;
58 char *p;
59
60 path = env_path;
61 /* NOFORK NB: xmalloc inside find_executable(), must have no allocs above! */
62 while ((p = find_executable(*argv, &path)) != NULL) {
63 missing = 0;
64 puts(p);
65 free(p);
66 if (!option_mask32) /* -a not set */
67 break;
68 }
69 }
70 status |= missing;
71 } while (*++argv);
72
73 return status;
74 }
75