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 "cache.h"
15#include "path.h"
 
16#include <linux/kernel.h>
17#include <limits.h>
18#include <stdio.h>
 
19#include <sys/types.h>
20#include <sys/stat.h>
21#include <dirent.h>
22#include <unistd.h>
23
24static char bad_path[] = "/bad-path/";
25/*
26 * One hack:
27 */
28static char *get_pathname(void)
29{
30	static char pathname_array[4][PATH_MAX];
31	static int idx;
32
33	return pathname_array[3 & ++idx];
34}
35
36static char *cleanup_path(char *path)
37{
38	/* Clean it up */
39	if (!memcmp(path, "./", 2)) {
40		path += 2;
41		while (*path == '/')
42			path++;
43	}
44	return path;
45}
46
47char *mkpath(const char *fmt, ...)
48{
49	va_list args;
50	unsigned len;
51	char *pathname = get_pathname();
52
53	va_start(args, fmt);
54	len = vsnprintf(pathname, PATH_MAX, fmt, args);
55	va_end(args);
56	if (len >= PATH_MAX)
57		return bad_path;
58	return cleanup_path(pathname);
59}
60
61int path__join(char *bf, size_t size, const char *path1, const char *path2)
62{
63	return scnprintf(bf, size, "%s%s%s", path1, path1[0] ? "/" : "", path2);
64}
65
66int path__join3(char *bf, size_t size, const char *path1, const char *path2, const char *path3)
67{
68	return scnprintf(bf, size, "%s%s%s%s%s", path1, path1[0] ? "/" : "",
69			 path2, path2[0] ? "/" : "", path3);
70}
71
72bool is_regular_file(const char *file)
73{
74	struct stat st;
75
76	if (stat(file, &st))
77		return false;
78
79	return S_ISREG(st.st_mode);
80}
81
82/* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
83bool is_directory(const char *base_path, const struct dirent *dent)
84{
85	char path[PATH_MAX];
86	struct stat st;
87
88	sprintf(path, "%s/%s", base_path, dent->d_name);
89	if (stat(path, &st))
90		return false;
91
92	return S_ISDIR(st.st_mode);
 
 
 
 
 
 
 
 
 
 
 
 
93}

  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	snprintf(path, sizeof(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}
 95
 96bool is_executable_file(const char *base_path, const struct dirent *dent)
 97{
 98	char path[PATH_MAX];
 99	struct stat st;
100
101	snprintf(path, sizeof(path), "%s/%s", base_path, dent->d_name);
102	if (stat(path, &st))
103		return false;
104
105	return !S_ISDIR(st.st_mode) && (st.st_mode & S_IXUSR);
106}