busybox/libbb/execable.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "libbb.h"

/* check if path points to an executable file;
 * return 1 if found;
 * return 0 otherwise;
 */
int execable_file(const char *name)
{
	struct stat s;
	return (!access(name, X_OK) && !stat(name, &s) && S_ISREG(s.st_mode));
}

/* search $PATH for an executable file;
 * return allocated string containing full path if found;
 * return NULL otherwise;
 */
char *find_execable(const char *filename)
{
	char *path, *p, *n;

	p = path = xstrdup(getenv("PATH"));
	while (p) {
		n = strchr(p, ':');
		if (n)
			*n++ = '\0';
		if (*p != '\0') { /* it's not a PATH="foo::bar" situation */
			p = concat_path_file(p, filename);
			if (execable_file(p)) {
				free(path);
				return p;
			}
			free(p);
		}
		p = n;
	}
	free(path);
	return NULL;
}

/* search $PATH for an executable file;
 * return 1 if found;
 * return 0 otherwise;
 */
int exists_execable(const char *filename)
{
	char *ret = find_execable(filename);
	if (ret) {
		free(ret);
		return 1;
	}
	return 0;
}
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 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	*/
26	char 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	*/
53	int 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	}