Commit | Line | Data |
---|---|---|
07800601 IM |
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 | ||
15 | static char bad_path[] = "/bad-path/"; | |
16 | /* | |
814b3f51 | 17 | * One hack: |
07800601 | 18 | */ |
07800601 IM |
19 | static char *get_pathname(void) |
20 | { | |
21 | static char pathname_array[4][PATH_MAX]; | |
83a0944f IM |
22 | static int idx; |
23 | ||
24 | return pathname_array[3 & ++idx]; | |
07800601 IM |
25 | } |
26 | ||
27 | static char *cleanup_path(char *path) | |
28 | { | |
29 | /* Clean it up */ | |
30 | if (!memcmp(path, "./", 2)) { | |
31 | path += 2; | |
32 | while (*path == '/') | |
33 | path++; | |
34 | } | |
35 | return path; | |
36 | } | |
37 | ||
07800601 IM |
38 | char *mkpath(const char *fmt, ...) |
39 | { | |
40 | va_list args; | |
41 | unsigned len; | |
42 | char *pathname = get_pathname(); | |
43 | ||
44 | va_start(args, fmt); | |
45 | len = vsnprintf(pathname, PATH_MAX, fmt, args); | |
46 | va_end(args); | |
47 | if (len >= PATH_MAX) | |
48 | return bad_path; | |
49 | return cleanup_path(pathname); | |
50 | } |