1 /* 2 * Copyright (c) 1987 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 * 17 * @(#)endian.h 7.3 (Berkeley) 06/29/88 18 */ 19 20 /* 21 * Definitions for byte order, 22 * according to byte significance from low address to high. 23 */ 24 #define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */ 25 #define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */ 26 #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */ 27 28 #define BYTE_ORDER BIG_ENDIAN /* byte order on tahoe */ 29 30 /* 31 * Macros for network/external number representation conversion. 32 */ 33 #if BYTE_ORDER == BIG_ENDIAN && !defined(lint) 34 #define ntohl(x) (x) 35 #define ntohs(x) (x) 36 #define htonl(x) (x) 37 #define htons(x) (x) 38 #else 39 unsigned short ntohs(), htons(); 40 unsigned long ntohl(), htonl(); 41 #endif 42