Add path utilities

include/path_utils.h

@@ -0,0 +1,18 @@
+#ifndef PATH_UTILS_H
+#define PATH_UTILS_H
+
+#include "aliases.h"
+
+#define NUMPARTS(...)                                                          \
+  (sizeof((const char *[]){"", __VA_ARGS__}) / sizeof(const char *) - 1)
+
+#define JOIN_PATH(DST, ...) join_path(DST, NUMPARTS(__VA_ARGS__), __VA_ARGS__)
+
+void join_path(char *dst, u64 count, ...);
+
+#define DIRNAME(DST, PATH) dirup(DST, 1, PATH)
+#define DIRUP(DST, COUNT, PATH) dirup(DST, COUNT, PATH)
+
+void dirup(char *dst, u64 levels, const char *path);
+
+#endif // !PATH_UTILS_H