/***
*stddef.h - definitions/declarations for common constants, types, variables
*
*   Copyright (c) 1985-1992, Microsoft Corporation.  All rights reserved.
*
*Purpose:
*   This file contains definitions and declarations for some commonly
*   used constants, types, and variables.
*   [ANSI]
*
****/

#ifndef _INC_STDDEF

#ifdef __cplusplus
extern "C" {
#endif 

#if (_MSC_VER <= 600)
#define __cdecl     _cdecl
#define __far       _far
#define __near      _near
#endif 

/* define the NULL pointer value and the offsetof() macro */

#ifndef NULL
#ifdef __cplusplus
#define NULL    0
#else 
#define NULL    ((void *)0)
#endif 
#endif 


/* offset of field m in a struct s */

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


/* errno declaration */

#ifdef _MT
extern int __far * __cdecl __far volatile _errno(void);
#define errno   (*_errno())
#else 
extern int __near __cdecl volatile errno;
#endif 


/* 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
/* define pointer to thread id value */

extern int __far *_threadid;
#endif 

#ifdef __cplusplus
}
#endif 

#define _INC_STDDEF
#endif