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 this notice is preserved and that due credit is given 7 * to the University of California at Berkeley. The name of the University 8 * may not be used to endorse or promote products derived from this 9 * software without specific prior written permission. This software 10 * is provided ``as is'' without express or implied warranty. 11 * 12 * @(#)endian.h 7.2 (Berkeley) 01/21/88 13 */ 14 15 /* 16 * Definitions for byte order, 17 * according to byte significance from low address to high. 18 */ 19 #define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */ 20 #define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */ 21 #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */ 22 23 #define BYTE_ORDER LITTLE_ENDIAN /* byte order on vax */ 24 25 /* 26 * Macros for network/external number representation conversion. 27 */ 28 #if BYTE_ORDER == BIG_ENDIAN && !defined(lint) 29 #define ntohl(x) (x) 30 #define ntohs(x) (x) 31 #define htonl(x) (x) 32 #define htons(x) (x) 33 #else 34 unsigned short ntohs(), htons(); 35 unsigned long ntohl(), htonl(); 36 #endif 37