| Linus Torvalds | 26c8a53 | 2005-07-08 23:20:59 | [diff] [blame] | 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.git", base, name), O_RDONLY); |
| 10 | * |
| 11 | * which is what it's designed for. |
| 12 | */ |
| 13 | #include "cache.h" |
| 14 | |
| 15 | static char pathname[PATH_MAX]; |
| 16 | static char bad_path[] = "/bad-path/"; |
| 17 | |
| 18 | static char *cleanup_path(char *path) |
| 19 | { |
| 20 | /* Clean it up */ |
| 21 | if (!memcmp(path, "./", 2)) { |
| 22 | path += 2; |
| 23 | while (*path == '/') |
| 24 | path++; |
| 25 | } |
| 26 | return path; |
| 27 | } |
| 28 | |
| 29 | char *mkpath(const char *fmt, ...) |
| 30 | { |
| 31 | va_list args; |
| 32 | unsigned len; |
| 33 | |
| 34 | va_start(args, fmt); |
| 35 | len = vsnprintf(pathname, PATH_MAX, fmt, args); |
| 36 | va_end(args); |
| 37 | if (len >= PATH_MAX) |
| 38 | return bad_path; |
| 39 | return cleanup_path(pathname); |
| 40 | } |
| 41 | |
| 42 | char *git_path(const char *fmt, ...) |
| 43 | { |
| Sven Verdoolaege | 5da1606 | 2005-09-26 20:54:01 | [diff] [blame] | 44 | const char *git_dir = get_git_dir(); |
| Linus Torvalds | 26c8a53 | 2005-07-08 23:20:59 | [diff] [blame] | 45 | va_list args; |
| 46 | unsigned len; |
| 47 | |
| 48 | len = strlen(git_dir); |
| 49 | if (len > PATH_MAX-100) |
| 50 | return bad_path; |
| 51 | memcpy(pathname, git_dir, len); |
| 52 | if (len && git_dir[len-1] != '/') |
| 53 | pathname[len++] = '/'; |
| 54 | va_start(args, fmt); |
| 55 | len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args); |
| 56 | va_end(args); |
| 57 | if (len >= PATH_MAX) |
| 58 | return bad_path; |
| 59 | return cleanup_path(pathname); |
| 60 | } |
| Holger Eitzenberger | f2db68e | 2005-08-04 20:43:03 | [diff] [blame] | 61 | |
| 62 | |
| 63 | /* git_mkstemp() - create tmp file honoring TMPDIR variable */ |
| 64 | int git_mkstemp(char *path, size_t len, const char *template) |
| 65 | { |
| 66 | char *env, *pch = path; |
| 67 | |
| 68 | if ((env = getenv("TMPDIR")) == NULL) { |
| 69 | strcpy(pch, "/tmp/"); |
| 70 | len -= 5; |
| Holger Eitzenberger | 35c3c62 | 2005-08-08 20:33:08 | [diff] [blame] | 71 | pch += 5; |
| 72 | } else { |
| 73 | size_t n = snprintf(pch, len, "%s/", env); |
| 74 | |
| 75 | len -= n; |
| 76 | pch += n; |
| 77 | } |
| Holger Eitzenberger | f2db68e | 2005-08-04 20:43:03 | [diff] [blame] | 78 | |
| 79 | safe_strncpy(pch, template, len); |
| 80 | |
| 81 | return mkstemp(path); |
| 82 | } |
| 83 | |
| 84 | |
| 85 | char *safe_strncpy(char *dest, const char *src, size_t n) |
| 86 | { |
| 87 | strncpy(dest, src, n); |
| 88 | dest[n - 1] = '\0'; |
| 89 | |
| 90 | return dest; |
| 91 | } |
