Add original unix v6

source/iolib/wdleng.c

@@ -0,0 +1,10 @@
+wdleng ()
+/* returns number of bits in a machine integer */
+/* written so kernighan can tell where he is running */
+{
+int k, leng;
+k = leng = 1;
+while (k =<< 1)
+	leng++;
+return (leng);
+}