summaryrefslogtreecommitdiff
path: root/debianutils/which.c
blob: a82641909acb8ecad8f80922e5022097ad20d6a7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
/* vi: set sw=4 ts=4: */
/*
 * Which implementation for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 *
 * Based on which from debianutils
 */

#include "libbb.h"

int which_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int which_main(int argc UNUSED_PARAM, char **argv)
{
	IF_DESKTOP(int opt;)
	int status = EXIT_SUCCESS;
	char *path;
	char *p;

	opt_complementary = "-1"; /* at least one argument */
	IF_DESKTOP(opt =) getopt32(argv, "a");
	argv += optind;

	/* This matches what is seen on e.g. ubuntu.
	 * "which" there is a shell script. */
	path = getenv("PATH");
	if (!path) {
		path = (char*)bb_PATH_root_path;
		putenv(path);
		path += 5; /* skip "PATH=" */
	}

	do {
#if ENABLE_DESKTOP
/* Much bloat just to support -a */
		if (strchr(*argv, '/')) {
			if (execable_file(*argv)) {
				puts(*argv);
				continue;
			}
			status = EXIT_FAILURE;
		} else {
			char *path2 = xstrdup(path);
			char *tmp = path2;

			p = find_execable(*argv, &tmp);
			if (!p)
				status = EXIT_FAILURE;
			else {
 print:
				puts(p);
				free(p);
				if (opt) {
					/* -a: show matches in all PATH components */
					if (tmp) {
						p = find_execable(*argv, &tmp);
						if (p)
							goto print;
					}
				}
			}
			free(path2);
		}
#else
/* Just ignoring -a */
		if (strchr(*argv, '/')) {
			if (execable_file(*argv)) {
				puts(*argv);
				continue;
			}
		} else {
			char *path2 = xstrdup(path);
			char *tmp = path2;
			p = find_execable(*argv, &tmp);
			free(path2);
			if (p) {
				puts(p);
				free(p);
				continue;
			}
		}
		status = EXIT_FAILURE;
#endif
	} while (*(++argv) != NULL);

	fflush_stdout_and_exit(status);
}