Program for stop and wait protocol in c language?

Answer 1

/*************************************************************************************/

/* C program to implement stop and wait protocol*/

/* Download more programs at http://sourcecode4u.com/ */

/*************************************************************************************/

#include<stdio.h>

#include<conio.h>

#define MAXSIZE 100

typedef struct

{

unsigned char data[MAXSIZE];

}packet;

typedef enum{data,ack}frame_kind;

typedef struct

{

frame_kind kind;

int sq_no;

int ack;

packet info;

}frame;

typedef enum{frame_arrival}event_type;

typedef enum{true_false}boolean;

void frame_network_layer(packet *p)

{

printf("\n from network arrival");

}

void to_physical_layer(frame *f)

{

printf("\n to physical layer");

}

void wait_for_event(event_type *e)

{

printf("\n waiting for event n");

}

void sender(void)

{

frame s;

packet buffer;

event_type event;

printf("\n ***SENDER***");

frame_network_layer(&buffer);

s.info=buffer;

to_physical_layer(&s);

wait_for_event(&event);

}

void from_physical_layer(frame *f)

{

printf("from physical layer");

}

void to_network_layer(packet *p)

{

printf("\n to network layer");

}

void receiver(void)

{

frame r,s;

event_type event;

printf("\n ***RECEIVER***");

wait_for_event(&event);

from_physical_layer(&r);

to_network_layer(&r.info);

to_physical_layer(&s);

}

main()

{

sender();

receiver();

getch();

}

Answer 2

/* Stop and Wait Protocol ( Flow Control ) */

#include<stdio.h>

#include<bios.h>

#include<conio.h>

#define COM1 0

#define SETTINGS 0x82

#define DTR 0x100

void main()

{

int ch,status,i=0,true=1;

char msg[100],ack,rec;

clrscr();

bioscom(0,SETTINGS,COM1);

printf("\n 1.Transmit\n 2.Receive");

printf("\n\n Enter the operation code : ");

scanf("%d",&ch);

switch(ch)

{

case 1 : printf("\n Enter the Message \n ");

scanf("%s",&msg);

while(msg[i]!='\0')

{

bioscom(1,msg[i],COM1);

printf("\n%c",msg[i]);

do

{

while(1)

{

status=bioscom(3,0,COM1);

if(status & DTR)

{

ack=bioscom(2,0,COM1) & 0x7F;

if(ack=='0')

{

bioscom(1,msg[i],COM1);

printf("\n%c - retransmitted ",msg[i]);

}

break;

}

}

}while(ack!='1');

i++;

}

break;

case 2 : printf("\n Receiver \t Press Escape to quit\n\n");

do

{

status=bioscom(3,0,COM1);

if(status & DTR)

{

rec=bioscom(2,0,COM1);

printf("\n%c -- Enter ACK(1 for +ve, 0 for -ve) :",rec);

ack=getche();

bioscom(1,ack,COM1);

}

if(kbhit())

if(getch()=='\x1b')

true=0;

}while(true);

break;

default : printf("\n Invalid Selection");

}

}