add missing files

macro.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#define ARRSZ(arr) (sizeof(arr) / sizeof(*arr))
+
+#define SWAP(a, b, type) do {					\
+	type tmp;						\
+	tmp = a;						\
+	a = b;							\
+	b = tmp;						\
+} while(0)
+
+
+#define ARR_FOREACH(arr, item) \
+	for (item = arr; item != arr + ARRSZ(arr) *  sizeof(*item); item++)
+