times.c

rstp for switch in vxworks

/************************************************************************ 
 * RSTP library - Rapid Spanning Tree (802.1t, 802.1w) 
 * Copyright (C) 2001-2003 Optical Access 
 * Author: Alex Rozin 
 * 
 * This file is part of RSTP library. 
 * 
 * RSTP library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by the 
 * Free Software Foundation; version 2.1 
 * 
 * RSTP library is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser 
 * General Public License for more details. 
 * 
 * You should have received a copy of the GNU Lesser General Public License 
 * along with RSTP library; see the file COPYING.  If not, write to the Free 
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 
 * 02111-1307, USA. 
 **********************************************************************/

/* "Times" API : bridgeTime, rootTimes, portTimes, designatedTimes, msgTimes */

#include "base.h"
#include "in.h"

int STP_compare_times (IN TIMEVALUES_T * t1, IN TIMEVALUES_T * t2)
{
	if (t1->MessageAge < t2->MessageAge)
		return -1;
	if (t1->MessageAge > t2->MessageAge)
		return 1;

	if (t1->MaxAge < t2->MaxAge)
		return -2;
	if (t1->MaxAge > t2->MaxAge)
		return 2;

	if (t1->ForwardDelay < t2->ForwardDelay)
		return -3;
	if (t1->ForwardDelay > t2->ForwardDelay)
		return 3;

	if (t1->HelloTime < t2->HelloTime)
		return -4;
	if (t1->HelloTime > t2->HelloTime)
		return 4;

	return 0;
}

void STP_get_times (IN BPDU_BODY_T * b, OUT TIMEVALUES_T * v)
{
	v->MessageAge = ntohs (*((unsigned short *) b->message_age)) >> 8;
	v->MaxAge = ntohs (*((unsigned short *) b->max_age)) >> 8;
	v->ForwardDelay = ntohs (*((unsigned short *) b->forward_delay)) >> 8;
	v->HelloTime = ntohs (*((unsigned short *) b->hello_time)) >> 8;
}

/**********************************************************************************
   function:
   purpose: 将v中的四个timer拷贝给b
   input:
   output:
   return:
   remark:
      
 **********************************************************************************/
void STP_set_times (IN TIMEVALUES_T * v, OUT BPDU_BODY_T * b)
{
	unsigned short mt;

#define STP_SET_TIME(f, t)        \
     mt = htons (f << 8);           \
     memcpy (t, &mt, 2);

	STP_SET_TIME (v->MessageAge, b->message_age);
	STP_SET_TIME (v->MaxAge, b->max_age);
	STP_SET_TIME (v->ForwardDelay, b->forward_delay);
	STP_SET_TIME (v->HelloTime, b->hello_time);
}

void STP_copy_times (OUT TIMEVALUES_T * t, IN TIMEVALUES_T * f)
{
	t->MessageAge = f->MessageAge;
	t->MaxAge = f->MaxAge;
	t->ForwardDelay = f->ForwardDelay;
	t->HelloTime = f->HelloTime;
}