1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * I'm tired of doing "vsnprintf()" etc just to open a
 4 * file, so here's a "return static buffer with printf"
 5 * interface for paths.
 6 *
 7 * It's obviously not thread-safe. Sue me. But it's quite
 8 * useful for doing things like
 9 *
10 *   f = open(mkpath("%s/%s.perf", base, name), O_RDONLY);
11 *
12 * which is what it's designed for.
13 */
14#include "path.h"
15#include "cache.h"
16#include <linux/kernel.h>
17#include <limits.h>
18#include <stdio.h>
19#include <string.h>
20#include <sys/types.h>
21#include <sys/stat.h>
22#include <dirent.h>
23#include <unistd.h>
24
25static char bad_path[] = "/bad-path/";
26/*
27 * One hack:
28 */
29static char *get_pathname(void)
30{
31	static char pathname_array[4][PATH_MAX];
32	static int idx;
33
34	return pathname_array[3 & ++idx];
35}
36
37static char *cleanup_path(char *path)
38{
39	/* Clean it up */
40	if (!memcmp(path, "./", 2)) {
41		path += 2;
42		while (*path == '/')
43			path++;
44	}
45	return path;
46}
47
48char *mkpath(const char *fmt, ...)
49{
50	va_list args;
51	unsigned len;
52	char *pathname = get_pathname();
53
54	va_start(args, fmt);
55	len = vsnprintf(pathname, PATH_MAX, fmt, args);
56	va_end(args);
57	if (len >= PATH_MAX)
58		return bad_path;
59	return cleanup_path(pathname);
60}
61
62int path__join(char *bf, size_t size, const char *path1, const char *path2)
63{
64	return scnprintf(bf, size, "%s%s%s", path1, path1[0] ? "/" : "", path2);
65}
66
67int path__join3(char *bf, size_t size, const char *path1, const char *path2, const char *path3)
68{
69	return scnprintf(bf, size, "%s%s%s%s%s", path1, path1[0] ? "/" : "",
70			 path2, path2[0] ? "/" : "", path3);
71}
72
73bool is_regular_file(const char *file)
74{
75	struct stat st;
76
77	if (stat(file, &st))
78		return false;
79
80	return S_ISREG(st.st_mode);
81}
82
83/* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
84bool is_directory(const char *base_path, const struct dirent *dent)
85{
86	char path[PATH_MAX];
87	struct stat st;
88
89	sprintf(path, "%s/%s", base_path, dent->d_name);
90	if (stat(path, &st))
91		return false;
92
93	return S_ISDIR(st.st_mode);
94}

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * I'm tired of doing "vsnprintf()" etc just to open a
 4 * file, so here's a "return static buffer with printf"
 5 * interface for paths.
 6 *
 7 * It's obviously not thread-safe. Sue me. But it's quite
 8 * useful for doing things like
 9 *
10 *   f = open(mkpath("%s/%s.perf", base, name), O_RDONLY);
11 *
12 * which is what it's designed for.
13 */
14#include "path.h"
15#include "cache.h"
16#include <linux/kernel.h>
17#include <limits.h>
18#include <stdio.h>
19#include <string.h>
20#include <sys/types.h>
21#include <sys/stat.h>
22#include <dirent.h>
23#include <unistd.h>
24
25static char bad_path[] = "/bad-path/";
26/*
27 * One hack:
28 */
29static char *get_pathname(void)
30{
31	static char pathname_array[4][PATH_MAX];
32	static int idx;
33
34	return pathname_array[3 & ++idx];
35}
36
37static char *cleanup_path(char *path)
38{
39	/* Clean it up */
40	if (!memcmp(path, "./", 2)) {
41		path += 2;
42		while (*path == '/')
43			path++;
44	}
45	return path;
46}
47
48char *mkpath(const char *fmt, ...)
49{
50	va_list args;
51	unsigned len;
52	char *pathname = get_pathname();
53
54	va_start(args, fmt);
55	len = vsnprintf(pathname, PATH_MAX, fmt, args);
56	va_end(args);
57	if (len >= PATH_MAX)
58		return bad_path;
59	return cleanup_path(pathname);
60}
61
62int path__join(char *bf, size_t size, const char *path1, const char *path2)
63{
64	return scnprintf(bf, size, "%s%s%s", path1, path1[0] ? "/" : "", path2);
65}
66
67int path__join3(char *bf, size_t size, const char *path1, const char *path2, const char *path3)
68{
69	return scnprintf(bf, size, "%s%s%s%s%s", path1, path1[0] ? "/" : "",
70			 path2, path2[0] ? "/" : "", path3);
71}
72
73bool is_regular_file(const char *file)
74{
75	struct stat st;
76
77	if (stat(file, &st))
78		return false;
79
80	return S_ISREG(st.st_mode);
81}
82
83/* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
84bool is_directory(const char *base_path, const struct dirent *dent)
85{
86	char path[PATH_MAX];
87	struct stat st;
88
89	sprintf(path, "%s/%s", base_path, dent->d_name);
90	if (stat(path, &st))
91		return false;
92
93	return S_ISDIR(st.st_mode);
94}