source: branches/2.2.5/mindi-busybox/libbb/execable.c @ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 13 years ago

Update to busybox 1.7.2

  • Property svn:eol-style set to native
File size: 1.4 KB
Line 
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 */
16int 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 $PATH for an executable file;
23 * return allocated string containing full path if found;
24 * return NULL otherwise;
25 */
26char *find_execable(const char *filename)
27{
28    char *path, *p, *n;
29
30    p = path = xstrdup(getenv("PATH"));
31    while (p) {
32        n = strchr(p, ':');
33        if (n)
34            *n++ = '\0';
35        if (*p != '\0') { /* it's not a PATH="foo::bar" situation */
36            p = concat_path_file(p, filename);
37            if (execable_file(p)) {
38                free(path);
39                return p;
40            }
41            free(p);
42        }
43        p = n;
44    }
45    free(path);
46    return NULL;
47}
48
49/* search $PATH for an executable file;
50 * return 1 if found;
51 * return 0 otherwise;
52 */
53int exists_execable(const char *filename)
54{
55    char *ret = find_execable(filename);
56    if (ret) {
57        free(ret);
58        return 1;
59    }
60    return 0;
61}
62
63#if ENABLE_FEATURE_PREFER_APPLETS
64/* just like the real execvp, but try to launch an applet named 'file' first
65 */
66int bb_execvp(const char *file, char *const argv[])
67{
68    return execvp(find_applet_by_name(file) ? bb_busybox_exec_path : file,
69                    argv);
70}
71#endif
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