Annotation of /tags/mkinitrd-6_1_12/busybox/libbb/execable.c
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Revision 816 -
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Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
Original Path: trunk/mkinitrd-magellan/busybox/libbb/execable.c
File MIME type: text/plain
File size: 1814 byte(s)
Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
Original Path: trunk/mkinitrd-magellan/busybox/libbb/execable.c
File MIME type: text/plain
File size: 1814 byte(s)
-updated to busybox-1.13.4
1 | niro | 532 | /* 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 | niro | 816 | int FAST_FUNC execable_file(const char *name) |
17 | niro | 532 | { |
18 | struct stat s; | ||
19 | return (!access(name, X_OK) && !stat(name, &s) && S_ISREG(s.st_mode)); | ||
20 | } | ||
21 | |||
22 | niro | 816 | /* search (*PATHp) for an executable file; |
23 | niro | 532 | * return allocated string containing full path if found; |
24 | niro | 816 | * 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 | niro | 532 | */ |
31 | niro | 816 | char* FAST_FUNC find_execable(const char *filename, char **PATHp) |
32 | niro | 532 | { |
33 | niro | 816 | char *p, *n; |
34 | niro | 532 | |
35 | niro | 816 | p = *PATHp; |
36 | niro | 532 | 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 | niro | 816 | *PATHp = n; |
44 | niro | 532 | return p; |
45 | } | ||
46 | free(p); | ||
47 | } | ||
48 | p = n; | ||
49 | niro | 816 | } /* on loop exit p == NULL */ |
50 | return p; | ||
51 | niro | 532 | } |
52 | |||
53 | /* search $PATH for an executable file; | ||
54 | * return 1 if found; | ||
55 | * return 0 otherwise; | ||
56 | */ | ||
57 | niro | 816 | int FAST_FUNC exists_execable(const char *filename) |
58 | niro | 532 | { |
59 | niro | 816 | char *path = xstrdup(getenv("PATH")); |
60 | char *tmp = path; | ||
61 | char *ret = find_execable(filename, &tmp); | ||
62 | free(path); | ||
63 | niro | 532 | if (ret) { |
64 | free(ret); | ||
65 | return 1; | ||
66 | } | ||
67 | return 0; | ||
68 | } | ||
69 | niro | 816 | |
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 |