02d450964f
argument in parentheses so these macros are safe to use and invocations with an expression as the argument like __bswap32_const(42 << 23 | 13) work as expected. Additionally, mask all the individually shifted bytes as appropriate so the bytes which exceed the width of the respective __bswapN_const() macro in invocations like __bswap16_const(0xdead600d) are ignored like it's the case with the corresponding __bswapN_var() function. MFC after: 3 days
123 lines
4.1 KiB
C
123 lines
4.1 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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* 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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#define _BYTE_ORDER _BIG_ENDIAN
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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) && defined(__OPTIMIZE__)
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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) ((((x) >> 8) & 0xff) | \
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(((x) << 8) & 0xff00))
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#define __bswap32_const(x) ((((x) >> 24) & 0xff) | \
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(((x) >> 8) & 0xff00) | (((x) << 8) & 0xff0000) | \
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(((x) << 24) & 0xff000000))
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#define __bswap64_const(x) ((((x) >> 56) & 0xff) | \
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(((x) >> 40) & 0xff00) | (((x) >> 24) & 0xff0000) | \
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(((x) >> 8) & 0xff000000) | \
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(((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)) | \
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(((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) (__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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