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- /****************************************************************************
- * include/stddef.h
- *
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership. The
- * ASF licenses this file to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance with the
- * License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations
- * under the License.
- *
- ****************************************************************************/
- #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 */
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