stddef.h

王朝百科·作者佚名 2011-01-27

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C语言头文件。

VC中stddef.h的内容：

/***

*stddef.h - definitions/declarations for common constants, types, variables

*Purpose:

* This file contains definitions and declarations for some commonly

* used constants, types, and variables.

* [ANSI]

* [Public]

****/

#if _MSC_VER > 1000

#pragma once

#endif

#ifndef _INC_STDDEF

#define _INC_STDDEF

#if !defined(_WIN32) && !defined(_MAC)

#error ERROR: Only Mac or Win32 targets supported!

#endif

#ifdef __cplusplus

extern "C" {

#endif

/* Define _CRTIMP */

#ifndef _CRTIMP

#ifdef _DLL

#define _CRTIMP __declspec(dllimport)

#else /* ndef _DLL */

#define _CRTIMP

#endif /* _DLL */

#endif /* _CRTIMP */

/* Define __cdecl for non-Microsoft compilers */

#if ( !defined(_MSC_VER) && !defined(__cdecl) )

#define __cdecl

#endif

/* Define _CRTAPI1 (for compatibility with the NT SDK) */

#ifndef _CRTAPI1

#if _MSC_VER >= 800 && _M_IX86 >= 300

#define _CRTAPI1 __cdecl

#else

#define _CRTAPI1

#endif

/* Define NULL pointer value and the offset() macro */

#ifndef NULL

#ifdef __cplusplus

#define NULL 0

#else

#define NULL ((void *)0)

#endif

#define offsetof(s,m) (size_t)&(((s *)0)->m)

/* Declare reference to errno */

#if (defined(_MT) || defined(_DLL)) && !defined(_MAC)

_CRTIMP extern int * __cdecl _errno(void);

#define errno (*_errno())

#else /* ndef _MT && ndef _DLL */

_CRTIMP extern int errno;

#endif /* _MT || _DLL */

/* define the implementation dependent size types */

#ifndef _PTRDIFF_T_DEFINED

typedef int ptrdiff_t;

#define _PTRDIFF_T_DEFINED

#endif

#ifndef _SIZE_T_DEFINED

typedef unsigned int size_t;

#define _SIZE_T_DEFINED

#endif

#ifndef _WCHAR_T_DEFINED

typedef unsigned short wchar_t;

#define _WCHAR_T_DEFINED

#endif

#ifdef _MT

_CRTIMP extern unsigned long __cdecl __threadid(void);

#define _threadid (__threadid())

_CRTIMP extern unsigned long __cdecl __threadhandle(void);

#endif

#ifdef __cplusplus

}

#endif

#endif /* _INC_STDDEF */