Contents of /tags/mkinitrd-6_1_8/busybox/libbb/execable.c
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Wed Oct 28 00:17:50 2009 UTC (14 years, 11 months ago) by niro
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Wed Oct 28 00:17:50 2009 UTC (14 years, 11 months ago) by niro
File MIME type: text/plain
File size: 1814 byte(s)
tagged 'mkinitrd-6_1_8'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Utility routines. |
4 | * |
5 | * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu> |
6 | * |
7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
8 | */ |
9 | |
10 | #include "libbb.h" |
11 | |
12 | /* check if path points to an executable file; |
13 | * return 1 if found; |
14 | * return 0 otherwise; |
15 | */ |
16 | int FAST_FUNC execable_file(const char *name) |
17 | { |
18 | struct stat s; |
19 | return (!access(name, X_OK) && !stat(name, &s) && S_ISREG(s.st_mode)); |
20 | } |
21 | |
22 | /* search (*PATHp) for an executable file; |
23 | * return allocated string containing full path if found; |
24 | * PATHp points to the component after the one where it was found |
25 | * (or NULL), |
26 | * you may call find_execable again with this PATHp to continue |
27 | * (if it's not NULL). |
28 | * return NULL otherwise; (PATHp is undefined) |
29 | * in all cases (*PATHp) contents will be trashed (s/:/NUL/). |
30 | */ |
31 | char* FAST_FUNC find_execable(const char *filename, char **PATHp) |
32 | { |
33 | char *p, *n; |
34 | |
35 | p = *PATHp; |
36 | while (p) { |
37 | n = strchr(p, ':'); |
38 | if (n) |
39 | *n++ = '\0'; |
40 | if (*p != '\0') { /* it's not a PATH="foo::bar" situation */ |
41 | p = concat_path_file(p, filename); |
42 | if (execable_file(p)) { |
43 | *PATHp = n; |
44 | return p; |
45 | } |
46 | free(p); |
47 | } |
48 | p = n; |
49 | } /* on loop exit p == NULL */ |
50 | return p; |
51 | } |
52 | |
53 | /* search $PATH for an executable file; |
54 | * return 1 if found; |
55 | * return 0 otherwise; |
56 | */ |
57 | int FAST_FUNC exists_execable(const char *filename) |
58 | { |
59 | char *path = xstrdup(getenv("PATH")); |
60 | char *tmp = path; |
61 | char *ret = find_execable(filename, &tmp); |
62 | free(path); |
63 | if (ret) { |
64 | free(ret); |
65 | return 1; |
66 | } |
67 | return 0; |
68 | } |
69 | |
70 | #if ENABLE_FEATURE_PREFER_APPLETS |
71 | /* just like the real execvp, but try to launch an applet named 'file' first |
72 | */ |
73 | int FAST_FUNC bb_execvp(const char *file, char *const argv[]) |
74 | { |
75 | return execvp(find_applet_by_name(file) >= 0 ? bb_busybox_exec_path : file, |
76 | argv); |
77 | } |
78 | #endif |