/* We allow "recursive" symbolic links. Only within reason, though. */
#define MAXDEPTH 5
-const char *make_absolute_path(const char *path)
+/*
+ * Use this to get the real path, i.e. resolve links. If you want an
+ * absolute path but don't mind links, use absolute_path.
+ *
+ * If path is our buffer, then return path, as it's already what the
+ * user wants.
+ */
+const char *real_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 buf_index = 1;
int depth = MAXDEPTH;
char *last_elem = NULL;
struct stat st;
+ /* We've already done it */
+ if (path == buf || path == next_buf)
+ return path;
+
if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
die ("Too long path: %.*s", 60, path);
while (depth--) {
if (!is_directory(buf)) {
- char *last_slash = strrchr(buf, '/');
+ char *last_slash = find_last_dir_sep(buf);
if (last_slash) {
*last_slash = '\0';
last_elem = xstrdup(last_slash + 1);
if (*buf) {
if (!*cwd && !getcwd(cwd, sizeof(cwd)))
- die ("Could not get current working directory");
+ die_errno ("Could not get current working directory");
if (chdir(buf))
- die ("Could not switch to '%s'", buf);
+ die_errno ("Could not switch to '%s'", buf);
}
if (!getcwd(buf, PATH_MAX))
- die ("Could not get current working directory");
+ die_errno ("Could not get current working directory");
if (last_elem) {
- int len = strlen(buf);
+ size_t 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);
+ if (len && !is_dir_sep(buf[len-1]))
+ buf[len++] = '/';
+ strcpy(buf + len, last_elem);
free(last_elem);
last_elem = NULL;
}
if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) {
- len = readlink(buf, next_buf, PATH_MAX);
+ ssize_t len = readlink(buf, next_buf, PATH_MAX);
if (len < 0)
- die ("Invalid symlink: %s", buf);
+ die_errno ("Invalid symlink '%s'", buf);
if (PATH_MAX <= len)
die("symbolic link too long: %s", buf);
next_buf[len] = '\0';
}
if (*cwd && chdir(cwd))
- die ("Could not change back to '%s'", cwd);
+ die_errno ("Could not change back to '%s'", cwd);
return buf;
}
pwd = getenv("PWD");
if (pwd && strcmp(pwd, cwd)) {
stat(cwd, &cwd_stat);
- if (!stat(pwd, &pwd_stat) &&
+ if ((cwd_stat.st_dev || cwd_stat.st_ino) &&
+ !stat(pwd, &pwd_stat) &&
pwd_stat.st_dev == cwd_stat.st_dev &&
pwd_stat.st_ino == cwd_stat.st_ino) {
strlcpy(cwd, pwd, PATH_MAX);
return cwd;
}
-const char *make_nonrelative_path(const char *path)
+/*
+ * Use this to get an absolute path from a relative one. If you want
+ * to resolve links, you should use real_path.
+ *
+ * If the path is already absolute, then return path. As the user is
+ * never meant to free the return value, we're safe.
+ */
+const char *absolute_path(const char *path)
{
static char buf[PATH_MAX + 1];
if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
die("Too long path: %.*s", 60, path);
} else {
+ size_t len;
+ const char *fmt;
const char *cwd = get_pwd_cwd();
if (!cwd)
- die("Cannot determine the current working directory");
- if (snprintf(buf, PATH_MAX, "%s/%s", cwd, path) >= PATH_MAX)
+ die_errno("Cannot determine the current working directory");
+ len = strlen(cwd);
+ fmt = (len > 0 && is_dir_sep(cwd[len-1])) ? "%s%s" : "%s/%s";
+ if (snprintf(buf, PATH_MAX, fmt, cwd, path) >= PATH_MAX)
die("Too long path: %.*s", 60, path);
}
return buf;
}
+
+/*
+ * Unlike prefix_path, this should be used if the named file does
+ * not have to interact with index entry; i.e. name of a random file
+ * on the filesystem.
+ */
+const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
+{
+ static char path[PATH_MAX];
+#ifndef WIN32
+ if (!pfx_len || is_absolute_path(arg))
+ return arg;
+ memcpy(path, pfx, pfx_len);
+ strcpy(path + pfx_len, arg);
+#else
+ char *p;
+ /* don't add prefix to absolute paths, but still replace '\' by '/' */
+ if (is_absolute_path(arg))
+ pfx_len = 0;
+ else if (pfx_len)
+ memcpy(path, pfx, pfx_len);
+ strcpy(path + pfx_len, arg);
+ for (p = path + pfx_len; *p; p++)
+ if (*p == '\\')
+ *p = '/';
+#endif
+ return path;
+}