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" | |
175729fc ACM |
14 | #include "util.h" |
15 | #include <limits.h> | |
07800601 IM |
16 | |
17 | static char bad_path[] = "/bad-path/"; | |
18 | /* | |
814b3f51 | 19 | * One hack: |
07800601 | 20 | */ |
07800601 IM |
21 | static char *get_pathname(void) |
22 | { | |
23 | static char pathname_array[4][PATH_MAX]; | |
83a0944f IM |
24 | static int idx; |
25 | ||
26 | return pathname_array[3 & ++idx]; | |
07800601 IM |
27 | } |
28 | ||
29 | static 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 | ||
07800601 IM |
40 | char *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 | } |