update

stddef.h

@@ -1,9 +1,10 @@
 #ifndef _STDDEF_H
 #define _STDDEF_H
 
-/* TCC include file */
 #define NULL ((void *)0)
 typedef unsigned int size_t;
 typedef int wchar_t;
+typedef int ptrdiff_t;
+#define offsetof(type, field) ((size_t) &((type *)0)->field)
 
 #endif