Add Conway's Game of Life

libc/str/memfrob.c

@@ -24,7 +24,10 @@
  * without meeting its requirements concerning secrecy or length.
  */
 void *memfrob(void *buf, size_t size) {
-  unsigned char *p = (unsigned char *)buf;
-  for (size_t i = 0; i < size; ++i) p[i] ^= '*';
+  size_t i;
+  unsigned char *p;
+  for (p = buf, i = 0; i < size; ++i) {
+    p[i] ^= '*';
+  }
   return buf;
 }