/*
* Bridge simulator
*/

#define NUM_OF_ADDRESSES 1000
#define SEG1_MAX         100
#define SEG2_MAX         200

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

void create_traffic (void);

/*
*
* Addresses 1-100 are on segment 1
* Addresses 101-200 are on segment 2
*
*/

int main(int argc, char **argv) {
  FILE *SEG1;
  FILE *SEG2;
  int i,addr,routed_to_1,routed_to_2;
  int stayed_on_1,stayed_on_2,invalid_on_1,invalid_on_2;

  create_traffic();
 
  SEG1 = fopen("segment1.dat","r");
  SEG2 = fopen("segment2.dat","r");
  routed_to_1 = 0;
  routed_to_2 = 0;
  stayed_on_1 = 0;
  stayed_on_2 = 0;
  invalid_on_1 = 0;
  invalid_on_2 = 0;
  
  for (i=1;i<=NUM_OF_ADDRESSES;i++) {
    /* from address in segment 1 */
    fscanf(SEG1,"%d",&addr);
    if (addr > 0 && addr <= SEG1_MAX) {
      stayed_on_1++;
      printf("%3d: remains on segment 1\n",addr);
    } else if (addr > SEG1_MAX && addr <= SEG2_MAX) {
      routed_to_2++;
      printf("%3d: routed to segment 2 from segment 1\n",addr);    
    } else {
      invalid_on_1++;
      printf("%3d: not a valid address\n",addr);
    }    
    
    /* from address in segment 2 */
    fscanf(SEG2,"%d",&addr);
    if (addr > 0 && addr <= SEG1_MAX) {
      routed_to_1++;
      printf("%3d: routed to segment 1 from segment 2\n",addr);
    } else if (addr > SEG1_MAX && addr <= SEG2_MAX) {
      stayed_on_2++;
      printf("%3d: remains on segment 2\n",addr);    
    } else {
      invalid_on_2++;
      printf("%3d: not a valid address\n",addr);
    } 
  }  
  
  fclose(SEG1);
  fclose(SEG2);

  printf("\n\n***Stats:***\n");
  printf("%d frames read from segment 1\n",NUM_OF_ADDRESSES);
  printf("Routed to segment 2 from segment 1: %d/%d\n",routed_to_2,NUM_OF_ADDRESSES);
  printf("Stayed on segment 1: %d/%d\n",stayed_on_1,NUM_OF_ADDRESSES);
  printf("Invalid from segment 1: %d/%d\n\n",invalid_on_1,NUM_OF_ADDRESSES);

  printf("%d frames read from segment 2\n",NUM_OF_ADDRESSES);
  printf("Routed to segment 1 from segment 2: %d/%d\n",routed_to_1,NUM_OF_ADDRESSES);
  printf("Stayed on segment 2: %d/%d\n",stayed_on_2,NUM_OF_ADDRESSES);
  printf("Invalid from segment 2: %d/%d\n",invalid_on_2,NUM_OF_ADDRESSES);

  return 0;
}

void create_traffic (void) {
  FILE *SEG1 = fopen("segment1.dat","w");
  FILE *SEG2 = fopen("segment2.dat","w");
  int i;
  int randnum;
  for (i=0;i<=NUM_OF_ADDRESSES;i++) {
    randnum = rand() % 200;
    (void) fprintf(SEG1,"%d\n",randnum);
    fflush(SEG1);  
    randnum = rand() % 200;
    (void) fprintf(SEG2,"%d\n",randnum);  
    fflush(SEG2);  
  }
  fclose(SEG1);
  fclose(SEG2);
}