36 lines
840 B
C
36 lines
840 B
C
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/*
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* stddef.h - common definitions
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*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* $Header$ */
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#ifndef _STDDEF_HEADER_
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#define _STDDEF_HEADER_
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#ifndef NULL
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#define NULL 0
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#endif /* NULL */
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/* ??? cast to char pointer necessary? */
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#define offsetof(type, ident) \
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(size_t) &(((type *)0)->ident)
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#ifndef _TYPE_PTRDIFF_
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#define _TYPE_PTRDIFF_
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typedef int ptrdiff_t; /* result of substracting two pointers */
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#endif /* _TYPE_PTRDIFF_ */
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#ifndef _TYPE_SIZE_
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#define _TYPE_SIZE_
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typedef unsigned int size_t; /* type returned by sizeof */
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#endif /* _TYPE_SIZE_ */
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#ifndef _TYPE_WCHAR_
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#define _TYPE_WCHAR_
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typedef char wchar_t; /* type expanded character set */
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#endif /* _TYPE_WCHAR_ */
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#endif /* _STDEF_HEADER_ */
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