103 lines
4.2 KiB
C
103 lines
4.2 KiB
C
/****************************************************************************
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* include/stddef.h
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*
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* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_STDDEF_H
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#define __INCLUDE_STDDEF_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/types.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* The <stddef.h> header shall define the following macros:
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*
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* NULL
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* The null pointer constant.
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*
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* NOTE: Currently the definition of NULL is in sys/types.h but should
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* be moved here sometime.
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*
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* offsetof(type, member-designator)
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* Integer constant expression of type size_t, the value of which is the
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* offset in bytes to the structure member (member-designator), from the
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* beginning of its structure (type).
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*
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* NOTE: This version of offsetof() depends on behaviors that could be
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* undefined for some compilers. It would be better to use a builtin
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* function if one exists.
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*
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* Reference: Opengroup.org
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*/
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#define offsetof(a, b) ((size_t)(&(((a *)(0))->b)))
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/****************************************************************************
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* Type Definitions
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****************************************************************************/
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/* The <stddef.h> header shall define the following types:
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*
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* ptrdiff_t
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* Signed integer type of the result of subtracting two pointers.
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*
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* wchar_t
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* Integer type whose range of values can represent distinct wide-character
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* codes for all members of the largest character set specified among the
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* locales supported by the compilation environment: the null character has
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* the code value 0 and each member of the portable character set has a
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* code value equal to its value when used as the lone character in an
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* integer character constant.
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*
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* size_t
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* Unsigned integer type of the result of the sizeof operator.
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*
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* NOTE: Currently the type definitions of ptrdiff_t, wchar_t, and size_t are
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* in sys/types.h but should be moved here sometime.
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*
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* The implementation shall support one or more programming environments in
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* which the widths of ptrdiff_t, size_t, and wchar_t are no greater than the
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* width of type long. The names of these programming environments can be
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* obtained using the confstr() function or the getconf utility.
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*
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* Reference: Opengroup.org
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*/
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#endif /* __INCLUDE_STDDEF_H */
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