util: add macro for iterating through all prefixes of a path

[elogind.git] / src / shared / path-util.h

diff --git a/src/shared/path-util.h b/src/shared/path-util.h
index 9452931586836e007d19e5dc861e60d5e8a76eb2..03f2cf273cdd0e8de63b21560fc21e2d04e66c38 100644 (file)
--- a/src/shared/path-util.h
+++ b/src/shared/path-util.h
@@ -51,3 +51,6 @@ int path_is_read_only_fs(const char *path);
 int path_is_os_tree(const char *path);
 
 int find_binary(const char *name, char **filename);
+
+#define PATH_FOREACH_PREFIX(prefix, path) \
+        for (char *_slash = strrchr(path_kill_slashes(strcpy(prefix, path)), '/'); _slash && !(*_slash = 0); _slash = strrchr((prefix), '/'))