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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
07800601 IM |
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" | |
9a3993d4 ACM |
15 | #include "path.h" |
16 | #include <linux/kernel.h> | |
175729fc | 17 | #include <limits.h> |
9a3993d4 ACM |
18 | #include <stdio.h> |
19 | #include <sys/types.h> | |
20 | #include <sys/stat.h> | |
21 | #include <unistd.h> | |
07800601 IM |
22 | |
23 | static char bad_path[] = "/bad-path/"; | |
24 | /* | |
814b3f51 | 25 | * One hack: |
07800601 | 26 | */ |
07800601 IM |
27 | static char *get_pathname(void) |
28 | { | |
29 | static char pathname_array[4][PATH_MAX]; | |
83a0944f IM |
30 | static int idx; |
31 | ||
32 | return pathname_array[3 & ++idx]; | |
07800601 IM |
33 | } |
34 | ||
35 | static char *cleanup_path(char *path) | |
36 | { | |
37 | /* Clean it up */ | |
38 | if (!memcmp(path, "./", 2)) { | |
39 | path += 2; | |
40 | while (*path == '/') | |
41 | path++; | |
42 | } | |
43 | return path; | |
44 | } | |
45 | ||
07800601 IM |
46 | char *mkpath(const char *fmt, ...) |
47 | { | |
48 | va_list args; | |
49 | unsigned len; | |
50 | char *pathname = get_pathname(); | |
51 | ||
52 | va_start(args, fmt); | |
53 | len = vsnprintf(pathname, PATH_MAX, fmt, args); | |
54 | va_end(args); | |
55 | if (len >= PATH_MAX) | |
56 | return bad_path; | |
57 | return cleanup_path(pathname); | |
58 | } | |
9a3993d4 ACM |
59 | |
60 | int path__join(char *bf, size_t size, const char *path1, const char *path2) | |
61 | { | |
62 | return scnprintf(bf, size, "%s%s%s", path1, path1[0] ? "/" : "", path2); | |
63 | } | |
64 | ||
65 | int path__join3(char *bf, size_t size, const char *path1, const char *path2, const char *path3) | |
66 | { | |
67 | return scnprintf(bf, size, "%s%s%s%s%s", path1, path1[0] ? "/" : "", | |
68 | path2, path2[0] ? "/" : "", path3); | |
69 | } | |
70 | ||
71 | bool is_regular_file(const char *file) | |
72 | { | |
73 | struct stat st; | |
74 | ||
75 | if (stat(file, &st)) | |
76 | return false; | |
77 | ||
78 | return S_ISREG(st.st_mode); | |
79 | } |