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b4edbce08c
are some good reasons for not doing this, even if the linting of the code breaks. 1) If lint were ever to understand the stuff inside the macros, that would break the checks. 2) There are ways to use __GNUC__ to exclude overly specific code. 3) (Not yet practical) Lint(1) needs to properlyu understand all of te code we actually run. Complained about by: bde Education by: jake, jhb, eivind
118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
/*
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* Copyright (c) 1987, 1991 Regents of the University of California.
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* 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* from: @(#)endian.h 7.8 (Berkeley) 4/3/91
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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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/*
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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 1
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#define _QUAD_LOWWORD 0
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#ifndef _POSIX_SOURCE
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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 LITTLE_ENDIAN
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#ifndef _KERNEL
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#include <sys/cdefs.h>
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#endif
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__BEGIN_DECLS
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unsigned long htonl(unsigned long);
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unsigned short htons(unsigned short);
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unsigned long ntohl(unsigned long);
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unsigned short ntohs(unsigned short);
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__END_DECLS
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#ifdef __GNUC__
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static __inline unsigned long
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__uint16_swap_uint32(unsigned long __x)
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{
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__asm ("rorl $16, %1" : "=r" (__x) : "0" (__x));
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return __x;
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}
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static __inline unsigned long
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__uint8_swap_uint32(unsigned long __x)
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{
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#if defined(_KERNEL) && (defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)) && !defined(I386_CPU)
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__asm ("bswap %0" : "=r" (__x) : "0" (__x));
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#else
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__asm ("xchgb %h1, %b1\n\trorl $16, %1\n\txchgb %h1, %b1"
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: "=q" (__x) : "0" (__x));
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#endif
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return __x;
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}
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static __inline unsigned short
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__uint8_swap_uint16(unsigned short __x)
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{
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__asm ("xchgb %h1, %b1" : "=q" (__x) : "0" (__x));
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return __x;
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}
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/*
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* Macros for network/external number representation conversion.
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*/
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#define ntohl __uint8_swap_uint32
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#define ntohs __uint8_swap_uint16
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#define htonl __uint8_swap_uint32
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#define htons __uint8_swap_uint16
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#endif /* __GNUC__ */
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#define NTOHL(x) ((x) = ntohl(x))
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#define NTOHS(x) ((x) = ntohs(x))
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#define HTONL(x) ((x) = htonl(x))
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#define HTONS(x) ((x) = htons(x))
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#endif /* ! _POSIX_SOURCE */
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#endif /* !_MACHINE_ENDIAN_H_ */
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