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POSIX.1-2008 tightened the definition of NULL to be 0 cast to the type 'void *'. Defining NULL as 0 is problematic, because it requires users to cast NULL to a pointer type before passing it to variadic functions. Using POSIX's definition is safer, because NULL can be used in all contexts without a cast, due to the alignment of 'void *' and 'char *' being the same. It also helps the compiler be able to detect when NULL is being used in an integer context. Link: <http://ewontfix.com/11/> Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
71 lines
3.0 KiB
C
71 lines
3.0 KiB
C
/*****************************************************************************/
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/* */
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/* stddef.h */
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/* */
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/* Common definitions */
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/* */
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/* */
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/* */
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/* (C) 1998-2009, Ullrich von Bassewitz */
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/* Roemerstrasse 52 */
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/* D-70794 Filderstadt */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#ifndef _STDDEF_H
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#define _STDDEF_H
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/* Standard data types */
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#ifndef _HAVE_ptrdiff_t
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#define _HAVE_ptrdiff_t
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typedef int ptrdiff_t;
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#endif
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#ifndef _HAVE_wchar_t
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#define _HAVE_wchar_t
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typedef char wchar_t;
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#endif
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#ifndef _HAVE_size_t
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#define _HAVE_size_t
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typedef unsigned size_t;
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#endif
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/* NULL pointer */
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#ifndef _HAVE_NULL
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#define NULL ((void *) 0)
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#define _HAVE_NULL
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#endif
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/* offsetof macro */
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#define offsetof(type, member) (size_t) (&((type*) 0)->member)
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/* End of stddef.h */
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#endif
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