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authorJohannes Schindelin <Johannes.Schindelin@gmx.de>2007-08-01 01:28:59 +0100
committerJunio C Hamano <gitster@pobox.com>2007-08-01 00:38:30 -0700
commite5392c51469c25851f9c6e53165d75fc61901768 (patch)
tree9fc9e6a7b22c40694e5bb6994c599da1a159d96e /path.c
parent73a7a65663223d08d8cabac8d873de21b7e9678d (diff)
downloadgit-e5392c51469c25851f9c6e53165d75fc61901768.tar.gz
Add is_absolute_path() and make_absolute_path()
This patch adds convenience functions to work with absolute paths. The function is_absolute_path() should help the efforts to integrate the MinGW fork. Note that make_absolute_path() returns a pointer to a static buffer. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'path.c')
-rw-r--r--path.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/path.c b/path.c
index dfff41f626..42609524a5 100644
--- a/path.c
+++ b/path.c
@@ -288,3 +288,68 @@ int adjust_shared_perm(const char *path)
return -2;
return 0;
}
+
+/* We allow "recursive" symbolic links. Only within reason, though. */
+#define MAXDEPTH 5
+
+const char *make_absolute_path(const char *path)
+{
+ static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1];
+ char cwd[1024] = "";
+ int buf_index = 1, len;
+
+ int depth = MAXDEPTH;
+ char *last_elem = NULL;
+ struct stat st;
+
+ if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
+ die ("Too long path: %.*s", 60, path);
+
+ while (depth--) {
+ if (stat(buf, &st) || !S_ISDIR(st.st_mode)) {
+ char *last_slash = strrchr(buf, '/');
+ if (last_slash) {
+ *last_slash = '\0';
+ last_elem = xstrdup(last_slash + 1);
+ } else
+ last_elem = xstrdup(buf);
+ }
+
+ if (*buf) {
+ if (!*cwd && !getcwd(cwd, sizeof(cwd)))
+ die ("Could not get current working directory");
+
+ if (chdir(buf))
+ die ("Could not switch to '%s'", buf);
+ }
+ if (!getcwd(buf, PATH_MAX))
+ die ("Could not get current working directory");
+
+ if (last_elem) {
+ int len = strlen(buf);
+ if (len + strlen(last_elem) + 2 > PATH_MAX)
+ die ("Too long path name: '%s/%s'",
+ buf, last_elem);
+ buf[len] = '/';
+ strcpy(buf + len + 1, last_elem);
+ free(last_elem);
+ last_elem = NULL;
+ }
+
+ if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) {
+ len = readlink(buf, next_buf, PATH_MAX);
+ if (len < 0)
+ die ("Invalid symlink: %s", buf);
+ next_buf[len] = '\0';
+ buf = next_buf;
+ buf_index = 1 - buf_index;
+ next_buf = bufs[buf_index];
+ } else
+ break;
+ }
+
+ if (*cwd && chdir(cwd))
+ die ("Could not change back to '%s'", cwd);
+
+ return buf;
+}