108 lines
3.8 KiB
C
108 lines
3.8 KiB
C
/****************************************************************************
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* include/stddef.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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/* Type whose alignment is supported in every context and is at least
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* as great as that of any standard type not using alignment specifiers.
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*/
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typedef struct
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{
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#if defined(CONFIG_HAVE_LONG_LONG)
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long long max_align_i;
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#else
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long max_align_i;
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#endif
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#if defined(CONFIG_HAVE_LONG_DOUBLE)
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long double max_align_f;
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#elif defined(CONFIG_HAVE_DOUBLE)
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double max_align_f;
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#elif defined(CONFIG_HAVE_FLOAT)
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float max_align_f;
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#endif
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} max_align_t;
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#endif /* __INCLUDE_STDDEF_H */
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