118 lines
3.8 KiB
C
118 lines
3.8 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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* @(#)endian.h 7.8 (Berkeley) 4/3/91
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*
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* PATCHES MAGIC LEVEL PATCH THAT GOT US HERE
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* -------------------- ----- ----------------------
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* CURRENT PATCH LEVEL: 1 00093
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* -------------------- ----- ----------------------
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*
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* 27 Feb 93 Charles Hannum Better byte-swapping macros for
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* i386/i486.
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*/
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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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#define __word_swap_long(x) \
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({ register u_long X = (x); \
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asm ("rorl $16, %1" \
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: "=r" (X) \
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: "0" (X)); \
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X; })
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#if __GNUC__ >= 2
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#define __byte_swap_long(x) \
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({ register u_long X = (x); \
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asm ("xchgb %h1, %b1\n\trorl $16, %1\n\txchgb %h1, %b1" \
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: "=q" (X) \
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: "0" (X)); \
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X; })
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#define __byte_swap_word(x) \
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({ register u_short X = (x); \
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asm ("xchgb %h1, %b1" \
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: "=q" (X) \
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: "0" (X)); \
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X; })
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#else /* __GNUC__ >= 2 */
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#define __byte_swap_long(x) \
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({ register u_long X = (x); \
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asm ("rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" \
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: "=r" (X) \
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: "0" (X)); \
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X; })
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#define __byte_swap_word(x) \
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({ register u_short X = (x); \
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asm ("rorw $8, %w1" \
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: "=r" (X) \
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: "0" (X)); \
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X; })
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#endif /* __GNUC__ >= 2 */
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/*
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* Macros for network/external number representation conversion.
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*/
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#if BYTE_ORDER == BIG_ENDIAN && !defined(lint)
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#define ntohl(x) (x)
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#define ntohs(x) (x)
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#define htonl(x) (x)
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#define htons(x) (x)
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#define NTOHL(x) (x)
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#define NTOHS(x) (x)
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#define HTONL(x) (x)
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#define HTONS(x) (x)
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#else
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#define ntohl __byte_swap_long
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#define ntohs __byte_swap_word
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#define htonl __byte_swap_long
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#define htons __byte_swap_word
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#define NTOHL(x) (x) = ntohl((u_long)x)
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#define NTOHS(x) (x) = ntohs((u_short)x)
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#define HTONL(x) (x) = htonl((u_long)x)
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#define HTONS(x) (x) = htons((u_short)x)
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#endif
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