-// UNNEEDED bool path_equal_or_files_same(const char *a, const char *b);
-// UNNEEDED char* path_join(const char *root, const char *path, const char *rest);
+bool path_equal_or_files_same(const char *a, const char *b);
+#if 0 /// UNNEEDED by elogind
+char* path_join(const char *root, const char *path, const char *rest);
+
+static inline bool path_equal_ptr(const char *a, const char *b) {
+ return !!a == !!b && (!a || path_equal(a, b));
+}
+#endif // 0
+
+/* Note: the search terminates on the first NULL item. */
+#define PATH_IN_SET(p, ...) \
+ ({ \
+ char **s; \
+ bool _found = false; \
+ STRV_FOREACH(s, STRV_MAKE(__VA_ARGS__)) \
+ if (path_equal(p, *s)) { \
+ _found = true; \
+ break; \
+ } \
+ _found; \
+ })