keil-C51-v6.12-完全解密版-17.8M.zip
源代码在线查看： stddef.h
/*--------------------------------------------------------------------------
STDDEF.H
Standard definitions.
Copyright (c) 1988-2001 Keil Elektronik GmbH and Keil Software, Inc.
All rights reserved.
--------------------------------------------------------------------------*/
#ifndef NULL
#define NULL ((void *) 0)
#endif
#ifndef _SIZE_T
#define _SIZE_T
typedef unsigned int size_t;
#endif
#ifndef _STDDEF_INCLUDED
#define _STDDEF_INCLUDED
typedef int ptrdiff_t;
#define offsetof(s,m) (size_t)&(((s *)0)->m)
#endif
