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
|
/* vi: set sw=4 ts=4: */
/*
* Which implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*
* Based on which from debianutils
*/
#include "busybox.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
static int is_executable_file(char *a, struct stat *b)
{
return (!access(a,X_OK) && !stat(a, b) && S_ISREG(b->st_mode));
}
int which_main(int argc, char **argv)
{
int status;
size_t i, count;
char *path_list, *p;
if (argc <= 1 || argv[1][0] == '-') {
bb_show_usage();
}
argc--;
path_list = getenv("PATH");
if (path_list != NULL) {
count = 1;
p = path_list;
while ((p = strchr(p, ':')) != NULL) {
*p++ = 0;
count++;
}
} else {
path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin";
count = 5;
}
status = EXIT_SUCCESS;
while (argc-- > 0) {
struct stat stat_b;
char *buf;
argv++;
buf = argv[0];
/* If filename is either absolute or contains slashes,
* stat it */
if (strchr(buf, '/')) {
if (is_executable_file(buf, &stat_b)) {
puts(buf);
goto next;
}
} else {
/* File doesn't contain slashes */
p = path_list;
for (i = 0; i < count; i++) {
/* Empty component in PATH is treated as . */
buf = concat_path_file(p[0] ? p : ".", argv[0]);
if (is_executable_file(buf, &stat_b)) {
puts(buf);
free(buf);
goto next;
}
free(buf);
p += strlen(p) + 1;
}
}
status = EXIT_FAILURE;
next: /* nothing */;
}
bb_fflush_stdout_and_exit(status);
}
|
