new build method for macway

util.c

@@ -0,0 +1,18 @@
+#include "util.h"
+
+int bitpop(uint8_t bits)
+{
+    int c;
+    for (c = 0; bits; c++)
+        bits &= bits -1;
+    return c;
+}
+
+int biton(uint8_t bits)
+{
+    int n = 0;
+    if (bits >> 4) { bits >>= 4; n += 4;}
+    if (bits >> 2) { bits >>= 2; n += 2;}
+    if (bits >> 1) { bits >>= 1; n += 1;}
+    return n;
+}