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Commit | Line | Data |
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5b8e6f85 DP |
1 | #include "cache.h" |
2 | ||
3 | /* We allow "recursive" symbolic links. Only within reason, though. */ | |
4 | #define MAXDEPTH 5 | |
5 | ||
6 | const char *make_absolute_path(const char *path) | |
7 | { | |
8 | static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1]; | |
9 | char cwd[1024] = ""; | |
10 | int buf_index = 1, len; | |
11 | ||
12 | int depth = MAXDEPTH; | |
13 | char *last_elem = NULL; | |
14 | struct stat st; | |
15 | ||
16 | if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX) | |
17 | die ("Too long path: %.*s", 60, path); | |
18 | ||
19 | while (depth--) { | |
20 | if (stat(buf, &st) || !S_ISDIR(st.st_mode)) { | |
21 | char *last_slash = strrchr(buf, '/'); | |
22 | if (last_slash) { | |
23 | *last_slash = '\0'; | |
24 | last_elem = xstrdup(last_slash + 1); | |
25 | } else { | |
26 | last_elem = xstrdup(buf); | |
27 | *buf = '\0'; | |
28 | } | |
29 | } | |
30 | ||
31 | if (*buf) { | |
32 | if (!*cwd && !getcwd(cwd, sizeof(cwd))) | |
33 | die ("Could not get current working directory"); | |
34 | ||
35 | if (chdir(buf)) | |
36 | die ("Could not switch to '%s'", buf); | |
37 | } | |
38 | if (!getcwd(buf, PATH_MAX)) | |
39 | die ("Could not get current working directory"); | |
40 | ||
41 | if (last_elem) { | |
42 | int len = strlen(buf); | |
43 | if (len + strlen(last_elem) + 2 > PATH_MAX) | |
44 | die ("Too long path name: '%s/%s'", | |
45 | buf, last_elem); | |
46 | buf[len] = '/'; | |
47 | strcpy(buf + len + 1, last_elem); | |
48 | free(last_elem); | |
49 | last_elem = NULL; | |
50 | } | |
51 | ||
52 | if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) { | |
53 | len = readlink(buf, next_buf, PATH_MAX); | |
54 | if (len < 0) | |
55 | die ("Invalid symlink: %s", buf); | |
56 | next_buf[len] = '\0'; | |
57 | buf = next_buf; | |
58 | buf_index = 1 - buf_index; | |
59 | next_buf = bufs[buf_index]; | |
60 | } else | |
61 | break; | |
62 | } | |
63 | ||
64 | if (*cwd && chdir(cwd)) | |
65 | die ("Could not change back to '%s'", cwd); | |
66 | ||
67 | return buf; | |
68 | } |