63d094a7e2
didn't already have them. This is because the ternary expression will return int, due to the Usual Arithmetic Conversions. Such casts are not needed for the 32 and 64 bit variants. While here, add additional parentheses around the x86 variant, to protect against unintended consequences. MFC after: 2 weeks
140 lines
4.5 KiB
C
140 lines
4.5 KiB
C
/*-
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* Copyright (c) 1987, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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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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* @(#)endian.h 8.1 (Berkeley) 6/10/93
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* $FreeBSD$
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*/
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#ifndef _MACHINE_ENDIAN_H_
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#define _MACHINE_ENDIAN_H_
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#include <sys/cdefs.h>
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#include <sys/_types.h>
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/*
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* Define the order of 32-bit words in 64-bit words.
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*/
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#define _QUAD_HIGHWORD 0
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#define _QUAD_LOWWORD 1
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/*
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* GCC defines _BIG_ENDIAN and _LITTLE_ENDIAN equal to __BIG_ENDIAN__
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* and __LITTLE_ENDIAN__ (resp).
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*/
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#ifdef _BIG_ENDIAN
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#undef _BIG_ENDIAN
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#endif
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#ifdef _LITTLE_ENDIAN
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#undef _LITTLE_ENDIAN
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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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#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
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#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
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#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
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#ifdef __LITTLE_ENDIAN__
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#define _BYTE_ORDER _LITTLE_ENDIAN
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#else
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#define _BYTE_ORDER _BIG_ENDIAN
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#endif
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/*
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* Deprecated variants that don't have enough underscores to be useful in more
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* strict namespaces.
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*/
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#if __BSD_VISIBLE
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#define LITTLE_ENDIAN _LITTLE_ENDIAN
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#define BIG_ENDIAN _BIG_ENDIAN
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#define PDP_ENDIAN _PDP_ENDIAN
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#define BYTE_ORDER _BYTE_ORDER
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#endif
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#if defined(__GNUCLIKE_BUILTIN_CONSTANT_P)
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#define __is_constant(x) __builtin_constant_p(x)
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#else
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#define __is_constant(x) 0
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#endif
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#define __bswap16_const(x) ((((__uint16_t)(x) >> 8) & 0xff) | \
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(((__uint16_t)(x) << 8) & 0xff00))
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#define __bswap32_const(x) ((((__uint32_t)(x) >> 24) & 0xff) | \
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(((__uint32_t)(x) >> 8) & 0xff00) | \
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(((__uint32_t)(x)<< 8) & 0xff0000) | \
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(((__uint32_t)(x) << 24) & 0xff000000))
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#define __bswap64_const(x) ((((__uint64_t)(x) >> 56) & 0xff) | \
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(((__uint64_t)(x) >> 40) & 0xff00) | \
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(((__uint64_t)(x) >> 24) & 0xff0000) | \
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(((__uint64_t)(x) >> 8) & 0xff000000) | \
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(((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) | \
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(((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) | \
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(((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) | \
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(((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56)))
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static __inline __uint16_t
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__bswap16_var(__uint16_t _x)
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{
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return ((_x >> 8) | ((_x << 8) & 0xff00));
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}
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static __inline __uint32_t
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__bswap32_var(__uint32_t _x)
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{
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return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
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((_x << 24) & 0xff000000));
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}
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static __inline __uint64_t
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__bswap64_var(__uint64_t _x)
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{
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return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
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((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
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((_x << 24) & ((__uint64_t)0xff << 40)) |
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((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
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}
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#define __bswap16(x) ((__uint16_t)(__is_constant(x) ? __bswap16_const(x) : \
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__bswap16_var(x)))
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#define __bswap32(x) (__is_constant(x) ? __bswap32_const(x) : \
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__bswap32_var(x))
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#define __bswap64(x) (__is_constant(x) ? __bswap64_const(x) : \
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__bswap64_var(x))
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#define __htonl(x) ((__uint32_t)(x))
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#define __htons(x) ((__uint16_t)(x))
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#define __ntohl(x) ((__uint32_t)(x))
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#define __ntohs(x) ((__uint16_t)(x))
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#endif /* !_MACHINE_ENDIAN_H_ */
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