/*  CS 555
 *  Programming Assignment #2
 *
 *  Simple routines to generate consistent output logs, printed to stdout.
 *
 */

#include <stdio.h>
#include <stdlib.h>


void ForwardUnicastPacket (int timestamp, int destination, int nexthop) 
{
    printf ("FU %d %d %d\n", timestamp, destination, nexthop);
}



void DropUnicastPacket (int timestamp, int destAddr) 
{
    printf ("DUP %d %d\n", timestamp, destAddr);
}


void DropMulticastPacket (int timestamp, int destAddr, int source) 
{
    printf ("DMP %d %d %d\n", timestamp, destAddr, source);
}


/*  Comparison function used by qsort ().  */
int intcmp (const void *x, const void *y) {

    int lop = * ((int *) x);
    int rop = * ((int *) y);

    if (lop < rop) return -1;
    else if (lop == rop) return 0;
    else return 1;

}


void ForwardMulticastPacket (int timestamp, int destAddr, int *ListOfNextHops, int listlen) 
{
    int i = 0; 

    /*  First, sort the list (to provide consistent output across programs). */
    qsort ((void *)ListOfNextHops, listlen, sizeof(int), intcmp);
  
    /*  Then print the list of forwarded packets. */
    for (i = 0; i < listlen; i ++) {
    	printf ("FMP %d %d %d\n", timestamp, destAddr, ListOfNextHops[i]);
    }
}