NetBSD/usr.sbin/tcpdump/extract.h

51 lines
2.0 KiB
C

/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#) Header: extract.h,v 1.4 92/05/25 14:28:36 mccanne Exp (LBL)
* $Id: extract.h,v 1.1 1993/11/14 21:20:08 deraadt Exp $
*/
#ifdef TCPDUMP_ALIGN
#if BYTEORDER == LITTLE_ENDIAN
#define EXTRACT_SHORT(p)\
((u_short)\
((u_short)*((u_char *)p+1)<<8|\
(u_short)*((u_char *)p+0)<<0))
#define EXTRACT_LONG(p)\
((u_long)*((u_char *)p+3)<<24|\
(u_long)*((u_char *)p+2)<<16|\
(u_long)*((u_char *)p+1)<<8|\
(u_long)*((u_char *)p+0)<<0)
#else
#define EXTRACT_SHORT(p)\
((u_short)\
((u_short)*((u_char *)p+0)<<8|\
(u_short)*((u_char *)p+1)<<0))
#define EXTRACT_LONG(p)\
((u_long)*((u_char *)p+0)<<24|\
(u_long)*((u_char *)p+1)<<16|\
(u_long)*((u_char *)p+2)<<8|\
(u_long)*((u_char *)p+3)<<0)
#endif
#else
#define EXTRACT_SHORT(p) ((u_short)ntohs(*(u_short *)p))
#define EXTRACT_LONG(p) (ntohl(*(u_long *)p))
#endif