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