projects / deliverable / linux.git / blame
| 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 | /* | |
| 17 | * Two hacks: | |
| 18 | */ | |
| 19 | ||
| 83a0944f | 20 | static const char *get_perf_dir(void) |
| 07800601 IM |
21 | { |
| 22 | return "."; | |
| 23 | } | |
| 24 | ||
| 07800601 IM |
25 | static char *get_pathname(void) |
| 26 | { | |
| 27 | static char pathname_array[4][PATH_MAX]; | |
| 83a0944f IM |
28 | static int idx; |
| 29 | ||
| 30 | return pathname_array[3 & ++idx]; | |
| 07800601 IM |
31 | } |
| 32 | ||
| 33 | static char *cleanup_path(char *path) | |
| 34 | { | |
| 35 | /* Clean it up */ | |
| 36 | if (!memcmp(path, "./", 2)) { | |
| 37 | path += 2; | |
| 38 | while (*path == '/') | |
| 39 | path++; | |
| 40 | } | |
| 41 | return path; | |
| 42 | } | |
| 43 | ||
| 07800601 IM |
44 | char *mkpath(const char *fmt, ...) |
| 45 | { | |
| 46 | va_list args; | |
| 47 | unsigned len; | |
| 48 | char *pathname = get_pathname(); | |
| 49 | ||
| 50 | va_start(args, fmt); | |
| 51 | len = vsnprintf(pathname, PATH_MAX, fmt, args); | |
| 52 | va_end(args); | |
| 53 | if (len >= PATH_MAX) | |
| 54 | return bad_path; | |
| 55 | return cleanup_path(pathname); | |
| 56 | } | |
| 57 | ||
| 58 | char *perf_path(const char *fmt, ...) | |
| 59 | { | |
| 60 | const char *perf_dir = get_perf_dir(); | |
| 61 | char *pathname = get_pathname(); | |
| 62 | va_list args; | |
| 63 | unsigned len; | |
| 64 | ||
| 65 | len = strlen(perf_dir); | |
| 66 | if (len > PATH_MAX-100) | |
| 67 | return bad_path; | |
| 68 | memcpy(pathname, perf_dir, len); | |
| 69 | if (len && perf_dir[len-1] != '/') | |
| 70 | pathname[len++] = '/'; | |
| 71 | va_start(args, fmt); | |
| 72 | len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args); | |
| 73 | va_end(args); | |
| 74 | if (len >= PATH_MAX) | |
| 75 | return bad_path; | |
| 76 | return cleanup_path(pathname); | |
| 77 | } | |
| 78 | ||
| 07800601 IM |
79 | /* strip arbitrary amount of directory separators at end of path */ |
| 80 | static inline int chomp_trailing_dir_sep(const char *path, int len) | |
| 81 | { | |
| 82 | while (len && is_dir_sep(path[len - 1])) | |
| 83 | len--; | |
| 84 | return len; | |
| 85 | } | |
| 86 | ||
| 87 | /* | |
| 88 | * If path ends with suffix (complete path components), returns the | |
| 89 | * part before suffix (sans trailing directory separators). | |
| 90 | * Otherwise returns NULL. | |
| 91 | */ | |
| 92 | char *strip_path_suffix(const char *path, const char *suffix) | |
| 93 | { | |
| 94 | int path_len = strlen(path), suffix_len = strlen(suffix); | |
| 95 | ||
| 96 | while (suffix_len) { | |
| 97 | if (!path_len) | |
| 98 | return NULL; | |
| 99 | ||
| 100 | if (is_dir_sep(path[path_len - 1])) { | |
| 101 | if (!is_dir_sep(suffix[suffix_len - 1])) | |
| 102 | return NULL; | |
| 103 | path_len = chomp_trailing_dir_sep(path, path_len); | |
| 104 | suffix_len = chomp_trailing_dir_sep(suffix, suffix_len); | |
| 105 | } | |
| 106 | else if (path[--path_len] != suffix[--suffix_len]) | |
| 107 | return NULL; | |
| 108 | } | |
| 109 | ||
| 110 | if (path_len && !is_dir_sep(path[path_len - 1])) | |
| 111 | return NULL; | |
| 151f85a4 | 112 | return strndup(path, chomp_trailing_dir_sep(path, path_len)); |
| 07800601 | 113 | } |