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endian.h revision 1.3 
      1 /*
      2  * Copyright (c) 1987, 1991 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  *	@(#)endian.h	7.7 (Berkeley) 4/3/91
     34  */
     35 
     36 /*
     37  * Definitions for byte order, according to byte significance from low
     38  * address to high.
     39  */
     40 #define	LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
     41 #define	BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
     42 #define	PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */
     43 
     44 #define	BYTE_ORDER	BIG_ENDIAN
     45 
     46 #include <sys/cdefs.h>
     47 
     48 __BEGIN_DECLS
     49 unsigned long	htonl __P((unsigned long));
     50 unsigned short	htons __P((unsigned short));
     51 unsigned long	ntohl __P((unsigned long));
     52 unsigned short	ntohs __P((unsigned short));
     53 __END_DECLS
     54 
     55 /*
     56  * Macros for network/external number representation conversion.
     57  */
     58 #if BYTE_ORDER == BIG_ENDIAN && !defined(lint)
     59 #define	ntohl(x)	(x)
     60 #define	ntohs(x)	(x)
     61 #define	htonl(x)	(x)
     62 #define	htons(x)	(x)
     63 
     64 #define	NTOHL(x)	(x)
     65 #define	NTOHS(x)	(x)
     66 #define	HTONL(x)	(x)
     67 #define	HTONS(x)	(x)
     68 
     69 #else
     70 
     71 #define	NTOHL(x)	(x) = ntohl((u_long)x)
     72 #define	NTOHS(x)	(x) = ntohs((u_short)x)
     73 #define	HTONL(x)	(x) = htonl((u_long)x)
     74 #define	HTONS(x)	(x) = htons((u_short)x)
     75 #endif
     76