byteorder.c

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· C语言 代码 · 共 85 行

#ifndef lint
static	char	*sccsid = "@(#)byteorder.c	4.1	(ULTRIX)	7/2/90";
#endif lint

/************************************************************************
 *									*
 *			Copyright (c) 1988 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/
/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *static char sccsid[] = "@(#)byteorder.c	2.4 (Berkeley) 5/20/86";
 */


#include "globals.h"
#include <protocols/timed.h>

/*
 * Two routines to do the necessary byte swapping for timed protocol
 * messages. Protocol is defined in /usr/include/protocols/timed.h
 */

bytenetorder(ptr)
struct tsp *ptr;
{
	ptr->tsp_seq = htons((u_short)ptr->tsp_seq);
	switch (ptr->tsp_type) {

	case TSP_SETTIME:
	case TSP_ADJTIME:
	case TSP_SETDATE:
	case TSP_SETDATEREQ:
		ptr->tsp_time.tv_sec = htonl((u_long)ptr->tsp_time.tv_sec);
		ptr->tsp_time.tv_usec = htonl((u_long)ptr->tsp_time.tv_usec);
		break;
	
	default:
		break;		/* nothing more needed */
	}
}

bytehostorder(ptr)
struct tsp *ptr;
{
	ptr->tsp_seq = ntohs((u_short)ptr->tsp_seq);
	switch (ptr->tsp_type) {

	case TSP_SETTIME:
	case TSP_ADJTIME:
	case TSP_SETDATE:
	case TSP_SETDATEREQ:
		ptr->tsp_time.tv_sec = ntohl((u_long)ptr->tsp_time.tv_sec);
		ptr->tsp_time.tv_usec = ntohl((u_long)ptr->tsp_time.tv_usec);
		break;
	
	default:
		break;		/* nothing more needed */
	}
}