1 /* 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * from: @(#)endian.h 7.7 (Berkeley) 4/3/91 36 * $Id: endian.h,v 1.2 1993/11/29 00:38:01 briggs Exp $ 37 */ 38 39 /* 40 ALICE 41 BG 05/24/92,17:10:58 42 I don't think we need to change this very much. 43 */ 44 45 /* 46 * Definitions for byte order, according to byte significance from low 47 * address to high. 48 */ 49 #define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 50 #define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 51 #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 52 53 #define BYTE_ORDER BIG_ENDIAN 54 55 #include <sys/cdefs.h> 56 57 #define __word_swap_long(x) \ 58 ({ register u_long X = (x); \ 59 asm ("swap %1" \ 60 : "=r" (X) \ 61 : "0" (X)); \ 62 X; }) 63 #if __GNUC__ >= 2 64 #define __byte_swap_long(x) \ 65 ({ register u_long X = (x); \ 66 asm ("xchgb %h1, %b1\n\tswap %1\n\txchgb %h1, %b1" \ 67 : "=q" (X) \ 68 : "0" (X)); \ 69 X; }) 70 #define __byte_swap_word(x) \ 71 ({ register u_short X = (x); \ 72 asm ("xchgb %h1, %b1" \ 73 : "=q" (X) \ 74 : "0" (X)); \ 75 X; }) 76 #else /* __GNUC__ >= 2 */ 77 #define __byte_swap_long(x) \ 78 ({ register u_long X = (x); \ 79 asm ("rorw #8, %w1\n\tswap %1\n\trorw #8, %w1" \ 80 : "=r" (X) \ 81 : "0" (X)); \ 82 X; }) 83 #define __byte_swap_word(x) \ 84 ({ register u_short X = (x); \ 85 asm ("rorw #8, %w1" \ 86 : "=r" (X) \ 87 : "0" (X)); \ 88 X; }) 89 #endif /* __GNUC__ >= 2 */ 90 91 __BEGIN_DECLS 92 unsigned long htonl __P((unsigned long)); 93 unsigned short htons __P((unsigned short)); 94 unsigned long ntohl __P((unsigned long)); 95 unsigned short ntohs __P((unsigned short)); 96 __END_DECLS 97 98 /* 99 * Macros for network/external number representation conversion. 100 */ 101 #if BYTE_ORDER == BIG_ENDIAN && !defined(lint) 102 #define ntohl(x) (x) 103 #define ntohs(x) (x) 104 #define htonl(x) (x) 105 #define htons(x) (x) 106 107 #define NTOHL(x) (x) 108 #define NTOHS(x) (x) 109 #define HTONL(x) (x) 110 #define HTONS(x) (x) 111 112 #else 113 114 #define ntohl __byte_swap_long 115 #define ntohs __byte_swap_word 116 #define htonl __byte_swap_long 117 #define htons __byte_swap_word 118 119 #define NTOHL(x) (x) = ntohl((u_long)x) 120 #define NTOHS(x) (x) = ntohs((u_short)x) 121 #define HTONL(x) (x) = htonl((u_long)x) 122 #define HTONS(x) (x) = htons((u_short)x) 123 #endif 124