/*********************************************************************/
/*                                                                   */
/* Courtesy Jim Kurose and Keith Ross, from their text               */
/*                                                                   */
/* Computer Networking: A Top-Down Approach Featuring the Internet,  */
/* 3rd edition                                                       */
/*                                                                   */
/*********************************************************************/

#include <stdio.h>

extern struct rtpkt {
  int sourceid;       /* id of sending router sending this pkt */
  int destid;         /* id of router to which pkt being sent 
                         (must be an immediate neighbor) */
  int mincost[4];    /* min cost to node 0 ... 3 */
  };

extern int TRACE;
extern int YES;
extern int NO;

struct distance_table 
{
  int costs[4][4];
} dt0;


/* students to write the following two routines, and maybe some others */

void rtinit0() 
{

}


void rtupdate0(rcvdpkt)
  struct rtpkt *rcvdpkt;
{

}


printdt0(dtptr)
  struct distance_table *dtptr;
  
{
  printf("                via     \n");
  printf("   D0 |    1     2    3 \n");
  printf("  ----|-----------------\n");
  printf("     1|  %3d   %3d   %3d\n",dtptr->costs[1][1],
	 dtptr->costs[1][2],dtptr->costs[1][3]);
  printf("dest 2|  %3d   %3d   %3d\n",dtptr->costs[2][1],
	 dtptr->costs[2][2],dtptr->costs[2][3]);
  printf("     3|  %3d   %3d   %3d\n",dtptr->costs[3][1],
	 dtptr->costs[3][2],dtptr->costs[3][3]);
}

linkhandler0(linkid, newcost)   
  int linkid, newcost;

/* called when cost from 0 to linkid changes from current value to newcost*/
/* You can leave this routine empty if you're an undergrad. If you want */
/* to use this routine, you'll need to change the value of the LINKCHANGE */
/* constant definition in prog3.c from 0 to 1 */
	
{
}