gitweb: use new Git::Repo API, and add optional caching
[git/gitweb-caching.git] / symlinks.c
blob5a5e781a15d7d9cb60797958433eca896b31ec85
1 #include "cache.h"
3 struct pathname {
4 int len;
5 char path[PATH_MAX];
6 };
8 /* Return matching pathname prefix length, or zero if not matching */
9 static inline int match_pathname(int len, const char *name, struct pathname *match)
11 int match_len = match->len;
12 return (len > match_len &&
13 name[match_len] == '/' &&
14 !memcmp(name, match->path, match_len)) ? match_len : 0;
17 static inline void set_pathname(int len, const char *name, struct pathname *match)
19 if (len < PATH_MAX) {
20 match->len = len;
21 memcpy(match->path, name, len);
22 match->path[len] = 0;
26 int has_symlink_leading_path(int len, const char *name)
28 static struct pathname link, nonlink;
29 char path[PATH_MAX];
30 struct stat st;
31 char *sp;
32 int known_dir;
35 * See if the last known symlink cache matches.
37 if (match_pathname(len, name, &link))
38 return 1;
41 * Get rid of the last known directory part
43 known_dir = match_pathname(len, name, &nonlink);
45 while ((sp = strchr(name + known_dir + 1, '/')) != NULL) {
46 int thislen = sp - name ;
47 memcpy(path, name, thislen);
48 path[thislen] = 0;
50 if (lstat(path, &st))
51 return 0;
52 if (S_ISDIR(st.st_mode)) {
53 set_pathname(thislen, path, &nonlink);
54 known_dir = thislen;
55 continue;
57 if (S_ISLNK(st.st_mode)) {
58 set_pathname(thislen, path, &link);
59 return 1;
61 break;
63 return 0;