olsrd_copy.c

wifi 无线网络路由协议OLSR linux下C代码

/*
 * Copyright (c) 2005, Bruno Randolf <[e-mail]>
 * Copyright (c) 2004, Andreas T鴑nesen(andreto-at-olsr.org)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met:
 *
 * * Redistributions of source code must retain the above copyright notice, 
 *   this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright notice, 
 *   this list of conditions and the following disclaimer in the documentation 
 *   and/or other materials provided with the distribution.
 * * Neither the name of the UniK olsr daemon 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
 * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
 
/* $Id: olsrd_copy.c,v 1.4 2005/05/29 12:47:42 br1 Exp $ */
 
/*
 * Dynamic linked library for UniK OLSRd
 */
 
/*************************************************************
 *                 TOOLS COPIED FROM OLSRD                   *
 *************************************************************/

// these functions are copied from the main olsrd source
// TODO: there must be a better way!!!

#include <string.h>
#include "olsrd_plugin.h"
#include "olsrd_copy.h"

#include "defs.h"

/**
 *Checks if a timer has times out. That means
 *if it is smaller than present time.
 *@param timer the timeval struct to evaluate
 *@return positive if the timer has not timed out,
 *0 if it matches with present time and negative
 *if it is timed out.
 */
int
olsr_timed_out(struct timeval *timer)
{
  return(timercmp(timer, &now, <));
}


/**
 *Initiates a "timer", wich is a timeval structure,
 *with the value given in time_value.
 *@param time_value the value to initialize the timer with
 *@param hold_timer the timer itself
 *@return nada
 */
void
olsr_init_timer(olsr_u32_t time_value, struct timeval *hold_timer)
{ 
  olsr_u16_t  time_value_sec;
  olsr_u16_t  time_value_msec;

  time_value_sec = time_value/1000;
  time_value_msec = time_value-(time_value_sec*1000);

  hold_timer->tv_sec = time_value_sec;
  hold_timer->tv_usec = time_value_msec*1000;   
}


/**
 *Generates a timestamp a certain number of milliseconds
 *into the future.
 *
 *@param time_value how many milliseconds from now
 *@param hold_timer the timer itself
 *@return nada
 */
void
olsr_get_timestamp(olsr_u32_t delay, struct timeval *hold_timer)
{ 
  olsr_u16_t  time_value_sec;
  olsr_u16_t  time_value_msec;

  time_value_sec = delay/1000;
  time_value_msec= delay - (delay*1000);
  
  hold_timer->tv_sec = now.tv_sec + time_value_sec;
  hold_timer->tv_usec = now.tv_usec + (time_value_msec*1000);   
}