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- /***
- *stddef.h - definitions/declarations for common constants, types, variables
- *
- * Copyright (c) 1985-1990, Microsoft Corporation. All rights reserved.
- *
- *Purpose:
- * This file contains definitions and declarations for some commonly
- * used constants, types, and variables.
- * [ANSI]
- *
- ****/
-
- #if defined(_DLL) && !defined(_MT)
- #error Cannot define _DLL without _MT
- #endif
-
- #ifdef _MT
- #define _FAR_ _far
- #else
- #define _FAR_
- #endif
-
- /* define the NULL pointer value and the offsetof() macro */
-
- #ifndef NULL
- #if (_MSC_VER >= 600)
- #define NULL ((void *)0)
- #elif (defined(M_I86SM) || defined(M_I86MM))
- #define NULL 0
- #else
- #define NULL 0L
- #endif
- #endif
-
- #define offsetof(s,m) (size_t)&(((s *)0)->m)
-
-
- /* declare reference to errno */
-
- #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
-
-
- #ifdef _MT
- /* define pointer to thread id value */
-
- extern int _far *_threadid;
- #endif
-