}
/*
- * If path ends with suffix (complete path components), returns the
- * part before suffix (sans trailing directory separators).
- * Otherwise returns NULL.
+ * If path ends with suffix (complete path components), returns the offset of
+ * the last character in the path before the suffix (sans trailing directory
+ * separators), and -1 otherwise.
*/
-char *strip_path_suffix(const char *path, const char *suffix)
+static ssize_t stripped_path_suffix_offset(const char *path, const char *suffix)
{
int path_len = strlen(path), suffix_len = strlen(suffix);
while (suffix_len) {
if (!path_len)
- return NULL;
+ return -1;
if (is_dir_sep(path[path_len - 1])) {
if (!is_dir_sep(suffix[suffix_len - 1]))
- return NULL;
+ return -1;
path_len = chomp_trailing_dir_sep(path, path_len);
suffix_len = chomp_trailing_dir_sep(suffix, suffix_len);
}
else if (path[--path_len] != suffix[--suffix_len])
- return NULL;
+ return -1;
}
if (path_len && !is_dir_sep(path[path_len - 1]))
- return NULL;
- return xstrndup(path, chomp_trailing_dir_sep(path, path_len));
+ return -1;
+ return chomp_trailing_dir_sep(path, path_len);
+}
+
+/*
+ * Returns true if the path ends with components, considering only complete path
+ * components, and false otherwise.
+ */
+int ends_with_path_components(const char *path, const char *components)
+{
+ return stripped_path_suffix_offset(path, components) != -1;
+}
+
+/*
+ * If path ends with suffix (complete path components), returns the
+ * part before suffix (sans trailing directory separators).
+ * Otherwise returns NULL.
+ */
+char *strip_path_suffix(const char *path, const char *suffix)
+{
+ ssize_t offset = stripped_path_suffix_offset(path, suffix);
+
+ return offset == -1 ? NULL : xstrndup(path, offset);
}
int daemon_avoid_alias(const char *p)