[PATCH] fix tutorial typo
[git/dscho.git] / path.c
blob142e575e5c293b92ff8a5612c7acc86d050c1119
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.
6 * It's obviously not thread-safe. Sue me. But it's quite
7 * useful for doing things like
9 * f = open(mkpath("%s/%s.git", base, name), O_RDONLY);
11 * which is what it's designed for.
13 #include "cache.h"
15 static char pathname[PATH_MAX];
16 static char bad_path[] = "/bad-path/";
18 static char *cleanup_path(char *path)
20 /* Clean it up */
21 if (!memcmp(path, "./", 2)) {
22 path += 2;
23 while (*path == '/')
24 path++;
26 return path;
29 char *mkpath(const char *fmt, ...)
31 va_list args;
32 unsigned len;
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);
42 char *git_path(const char *fmt, ...)
44 const char *git_dir;
45 va_list args;
46 unsigned len;
48 git_dir = gitenv(GIT_DIR_ENVIRONMENT);
49 if (!git_dir) git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
50 len = strlen(git_dir);
51 if (len > PATH_MAX-100)
52 return bad_path;
53 memcpy(pathname, git_dir, len);
54 if (len && git_dir[len-1] != '/')
55 pathname[len++] = '/';
56 va_start(args, fmt);
57 len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
58 va_end(args);
59 if (len >= PATH_MAX)
60 return bad_path;
61 return cleanup_path(pathname);
65 /* git_mkstemp() - create tmp file honoring TMPDIR variable */
66 int git_mkstemp(char *path, size_t len, const char *template)
68 char *env, *pch = path;
70 if ((env = getenv("TMPDIR")) == NULL) {
71 strcpy(pch, "/tmp/");
72 len -= 5;
73 pch += 5;
74 } else {
75 size_t n = snprintf(pch, len, "%s/", env);
77 len -= n;
78 pch += n;
81 safe_strncpy(pch, template, len);
83 return mkstemp(path);
87 char *safe_strncpy(char *dest, const char *src, size_t n)
89 strncpy(dest, src, n);
90 dest[n - 1] = '\0';
92 return dest;