95 lines
3.0 KiB
C
95 lines
3.0 KiB
C
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/* libc/sys/linux/sys/cdefs.h - Helper macros for K&R vs. ANSI C compat. */
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/* Written 2000 by Werner Almesberger */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Berkeley Software Design, Inc.
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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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* 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 the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be 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 REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)cdefs.h 8.8 (Berkeley) 1/9/95
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* $FreeBSD$
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*/
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#ifndef _SYS_DEFS_H_
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#define _SYS_DEFS_H_
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#include "types.h"
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#include "compiler.h"
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#ifndef __DEQUALIFY
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#define __DEQUALIFY(type, var) ((type)(uintptr_t)(const volatile void *)(var))
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#endif
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#ifndef offsetof
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#define offsetof(type, field) \
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((size_t)(uintptr_t)((const volatile void *)&((type *)0)->field))
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#endif
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#ifndef __offsetof
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#define __offsetof(type, field) offsetof(type, field)
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#endif
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#ifndef __containerof
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#define __containerof(ptr, type, field) \
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__DEQUALIFY(type *, (const volatile char *)(ptr) - offsetof(type, field))
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#endif
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#ifndef container_of
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#define container_of(ptr, type, field) __containerof(ptr, type, field)
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#endif
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/*
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* Definitions for byte order, according to byte significance from low
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* address to high.
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*/
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#ifndef _LITTLE_ENDIAN
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#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
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#endif
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#ifndef _BIG_ENDIAN
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#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
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#endif
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#ifndef LITTLE_ENDIAN
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#define LITTLE_ENDIAN _LITTLE_ENDIAN
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#endif
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#ifndef BIG_ENDIAN
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#define BIG_ENDIAN _BIG_ENDIAN
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#endif
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#ifndef _BYTE_ORDER
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#define _BYTE_ORDER _LITTLE_ENDIAN
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#endif
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#ifndef BYTE_ORDER
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#define BYTE_ORDER _BYTE_ORDER
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#endif
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#endif /* _SYS_DEFS_H_ */
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