stddef.h

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/***************************************************************************//**
 @file stddef.h
 
 @brief Common definitions for types and macros
*******************************************************************************/
#ifndef _STDDEF_H
#define _STDDEF_H
 
/* Type of the result of subtracting two pointers */
typedef signed long ptrdiff_t;
 
/* Type of the result of the sizeof operator */
#ifndef _SIZE_T
#define _SIZE_T
typedef unsigned long size_t;
#endif /* _SIZE_T */
 
/*
 * Type whose range of values can represent distinct codes for all members of the
 * largest extended character set specified among the supported locales
 */
typedef unsigned int wchar_t;
 
/* Null pointer constant */
#ifndef _NULL
#define _NULL
#define NULL ((void *) 0)
#endif /* _NULL */
 
/*
 * The offset, in bytes, to the structure member from the beginning of its
 * structure
 */
#define offsetof(type, member) ((size_t) &(type.member) - &type)
 
#endif /* _STDDEF_H */