Nim/tinyc/include/stddef.h

#ifndef _STDDEF_H
#define _STDDEF_H

typedef __SIZE_TYPE__ size_t;
typedef __PTRDIFF_TYPE__ ssize_t;
typedef __WCHAR_TYPE__ wchar_t;
typedef __PTRDIFF_TYPE__ ptrdiff_t;
typedef __PTRDIFF_TYPE__ intptr_t;
typedef __SIZE_TYPE__ uintptr_t;

#ifndef __int8_t_defined
#define __int8_t_defined
typedef signed char int8_t;
typedef signed short int int16_t;
typedef signed int int32_t;
#ifdef __LP64__
typedef signed long int int64_t;
#else
typedef signed long long int int64_t;
#endif
typedef unsigned char uint8_t;
typedef unsigned short int uint16_t;
typedef unsigned int uint32_t;
#ifdef __LP64__
typedef unsigned long int uint64_t;
#else
typedef unsigned long long int uint64_t;
#endif
#endif

#ifndef NULL
#define NULL ((void*)0)
#endif

#define offsetof(type, field) ((size_t)&((type *)0)->field)

void *alloca(size_t size);

#endif

/* Older glibc require a wint_t from <stddef.h> (when requested
   by __need_wint_t, as otherwise stddef.h isn't allowed to
   define this type).   Note that this must be outside the normal
   _STDDEF_H guard, so that it works even when we've included the file
   already (without requiring wint_t).  Some other libs define _WINT_T
   if they've already provided that type, so we can use that as guard.
   TCC defines __WINT_TYPE__ for us.  */
#if defined (__need_wint_t)
#ifndef _WINT_T
#define _WINT_T
typedef __WINT_TYPE__ wint_t;
#endif
#undef __need_wint_t
#endif