Merge branch 'jn/test-terminal-punt-on-osx-breakage' into maint
[git.git] / abspath.c
blobff140689ed2453809e7c3794c9989918e90df392
1 #include "cache.h"
3 /*
4 * Do not use this for inspecting *tracked* content. When path is a
5 * symlink to a directory, we do not want to say it is a directory when
6 * dealing with tracked content in the working tree.
7 */
8 int is_directory(const char *path)
10 struct stat st;
11 return (!stat(path, &st) && S_ISDIR(st.st_mode));
14 /* We allow "recursive" symbolic links. Only within reason, though. */
15 #define MAXDEPTH 5
17 const char *make_absolute_path(const char *path)
19 static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1];
20 char cwd[1024] = "";
21 int buf_index = 1;
23 int depth = MAXDEPTH;
24 char *last_elem = NULL;
25 struct stat st;
27 /* We've already done it */
28 if (path == buf || path == next_buf)
29 return path;
31 if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
32 die ("Too long path: %.*s", 60, path);
34 while (depth--) {
35 if (!is_directory(buf)) {
36 char *last_slash = strrchr(buf, '/');
37 if (last_slash) {
38 *last_slash = '\0';
39 last_elem = xstrdup(last_slash + 1);
40 } else {
41 last_elem = xstrdup(buf);
42 *buf = '\0';
46 if (*buf) {
47 if (!*cwd && !getcwd(cwd, sizeof(cwd)))
48 die_errno ("Could not get current working directory");
50 if (chdir(buf))
51 die_errno ("Could not switch to '%s'", buf);
53 if (!getcwd(buf, PATH_MAX))
54 die_errno ("Could not get current working directory");
56 if (last_elem) {
57 size_t len = strlen(buf);
58 if (len + strlen(last_elem) + 2 > PATH_MAX)
59 die ("Too long path name: '%s/%s'",
60 buf, last_elem);
61 if (len && buf[len-1] != '/')
62 buf[len++] = '/';
63 strcpy(buf + len, last_elem);
64 free(last_elem);
65 last_elem = NULL;
68 if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) {
69 ssize_t len = readlink(buf, next_buf, PATH_MAX);
70 if (len < 0)
71 die_errno ("Invalid symlink '%s'", buf);
72 if (PATH_MAX <= len)
73 die("symbolic link too long: %s", buf);
74 next_buf[len] = '\0';
75 buf = next_buf;
76 buf_index = 1 - buf_index;
77 next_buf = bufs[buf_index];
78 } else
79 break;
82 if (*cwd && chdir(cwd))
83 die_errno ("Could not change back to '%s'", cwd);
85 return buf;
88 static const char *get_pwd_cwd(void)
90 static char cwd[PATH_MAX + 1];
91 char *pwd;
92 struct stat cwd_stat, pwd_stat;
93 if (getcwd(cwd, PATH_MAX) == NULL)
94 return NULL;
95 pwd = getenv("PWD");
96 if (pwd && strcmp(pwd, cwd)) {
97 stat(cwd, &cwd_stat);
98 if (!stat(pwd, &pwd_stat) &&
99 pwd_stat.st_dev == cwd_stat.st_dev &&
100 pwd_stat.st_ino == cwd_stat.st_ino) {
101 strlcpy(cwd, pwd, PATH_MAX);
104 return cwd;
107 const char *make_nonrelative_path(const char *path)
109 static char buf[PATH_MAX + 1];
111 if (is_absolute_path(path)) {
112 if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
113 die("Too long path: %.*s", 60, path);
114 } else {
115 size_t len;
116 const char *fmt;
117 const char *cwd = get_pwd_cwd();
118 if (!cwd)
119 die_errno("Cannot determine the current working directory");
120 len = strlen(cwd);
121 fmt = (len > 0 && is_dir_sep(cwd[len-1])) ? "%s%s" : "%s/%s";
122 if (snprintf(buf, PATH_MAX, fmt, cwd, path) >= PATH_MAX)
123 die("Too long path: %.*s", 60, path);
125 return buf;