#ifndef _STDDEF_H#define _STDDEF_H #define NULL ((void *)0)typedef __SIZE_TYPE__ size_t;typedef __WCHAR_TYPE__ wchar_t;typedef __PTRDIFF_TYPE__ ptrdiff_t;#define offsetof(type, field) ((size_t) &((type *)0)->field) /* need to do that because of glibc 2.1 bug (should have a way to test   presence of 'long long' without __GNUC__, or TCC should define   __GNUC__ ? */#if !defined(__int8_t_defined) && !defined(__dietlibc__)#define __int8_t_definedtypedef char int8_t;typedef short int int16_t;typedef int int32_t;typedef long long int int64_t;#endif #ifdef __i386__void *_alloca(size_t);#define alloca _alloca#endif #endif