1// SPDX-License-Identifier: GPL-2.0
 2#include "path.h"
 
 
 
 
 
 
 
 
 
 
 3#include "cache.h"
 4#include <linux/kernel.h>
 5#include <limits.h>
 6#include <stdio.h>
 7#include <string.h>
 8#include <sys/types.h>
 9#include <sys/stat.h>
10#include <dirent.h>
11#include <unistd.h>
 
 
 
 
 
 
12
13static char *cleanup_path(char *path)
14{
15	/* Clean it up */
16	if (!memcmp(path, "./", 2)) {
17		path += 2;
18		while (*path == '/')
19			path++;
20	}
21	return path;
22}
23
24char *mkpath(char *path_buf, size_t sz, const char *fmt, ...)
25{
26	va_list args;
27	unsigned len;
 
28
29	va_start(args, fmt);
30	len = vsnprintf(path_buf, sz, fmt, args);
31	va_end(args);
32	if (len >= sz)
33		strncpy(path_buf, "/bad-path/", sz);
34	return cleanup_path(path_buf);
35}
36
37int path__join(char *bf, size_t size, const char *path1, const char *path2)
38{
39	return scnprintf(bf, size, "%s%s%s", path1, path1[0] ? "/" : "", path2);
40}
41
42int path__join3(char *bf, size_t size, const char *path1, const char *path2, const char *path3)
43{
44	return scnprintf(bf, size, "%s%s%s%s%s", path1, path1[0] ? "/" : "",
45			 path2, path2[0] ? "/" : "", path3);
46}
47
48bool is_regular_file(const char *file)
49{
50	struct stat st;
51
52	if (stat(file, &st))
53		return false;
54
55	return S_ISREG(st.st_mode);
56}
57
58/* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
59bool is_directory(const char *base_path, const struct dirent *dent)
60{
61	char path[PATH_MAX];
62	struct stat st;
63
64	snprintf(path, sizeof(path), "%s/%s", base_path, dent->d_name);
65	if (stat(path, &st))
66		return false;
67
68	return S_ISDIR(st.st_mode);
69}
70
71bool is_executable_file(const char *base_path, const struct dirent *dent)
72{
73	char path[PATH_MAX];
74	struct stat st;
75
76	snprintf(path, sizeof(path), "%s/%s", base_path, dent->d_name);
77	if (stat(path, &st))
78		return false;
79
80	return !S_ISDIR(st.st_mode) && (st.st_mode & S_IXUSR);
81}

 1/*
 2 * I'm tired of doing "vsnprintf()" etc just to open a
 3 * file, so here's a "return static buffer with printf"
 4 * interface for paths.
 5 *
 6 * It's obviously not thread-safe. Sue me. But it's quite
 7 * useful for doing things like
 8 *
 9 *   f = open(mkpath("%s/%s.perf", base, name), O_RDONLY);
10 *
11 * which is what it's designed for.
12 */
13#include "cache.h"
14#include "util.h"
15#include <limits.h>
16
17static char bad_path[] = "/bad-path/";
18/*
19 * One hack:
20 */
21static char *get_pathname(void)
22{
23	static char pathname_array[4][PATH_MAX];
24	static int idx;
25
26	return pathname_array[3 & ++idx];
27}
28
29static char *cleanup_path(char *path)
30{
31	/* Clean it up */
32	if (!memcmp(path, "./", 2)) {
33		path += 2;
34		while (*path == '/')
35			path++;
36	}
37	return path;
38}
39
40char *mkpath(const char *fmt, ...)
41{
42	va_list args;
43	unsigned len;
44	char *pathname = get_pathname();
45
46	va_start(args, fmt);
47	len = vsnprintf(pathname, PATH_MAX, fmt, args);
48	va_end(args);
49	if (len >= PATH_MAX)
50		return bad_path;
51	return cleanup_path(pathname);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
52}