cpp_programming/stopNwait.cpp at main · Kartik8559/cpp_programming · GitHub

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#include<iostream>
#include<stdio.h>
#include<cstdlib>
#include<termios.h>
#include<unistd.h>
#include<ncurses.h>
using namespace std;

#define time 5
#define max_seq 1
#define tot_pack 5

int randn(int n){
	return rand()%n+1;
}

typedef struct{
	int data;
}packet;

typedef struct{
	int kind;
	int seq;
	int ack;
	packet info;
}frame;

typedef enum{
	frame_arrival,error,time_out
}event_type;
frame data1;

void from_network_layer(packet*);
void to_physical_layer(frame*);
void to_network_layer(packet*);
void from_physical_layer(frame*);
void sender();
void receiver();
void wait_for_event_sender(event_type*);
void wait_for_event_receiver(event_type*);

#define inc(k) if(k<max_seq)k++;else k=0;

int i=1;
char turn;
int disc=0;

int main(){
	while(!disc){
		sender();
		//delay(400)
		receiver();
	}getchar();
}

void sender(){
	static int frame_to_send = 0;
	static frame s;
	packet buffer;
	event_type event;
	static int flag=0;
	if(flag==0){
		from_network_layer(&buffer);
		s.info=buffer;
		s.seq=frame_to_send;
		cout<<"\nsender information\t"<<s.info.data<<endl;
		cout<<"\nsequence no.\t"<<s.seq;

		turn='r';
		to_physical_layer(&s);
		flag=1;
	}

	wait_for_event_sender(&event);
	if(turn=='s'){
		if(event==frame_arrival){
			from_network_layer(&buffer);
			inc(frame_to_send);
			s.info=buffer;
			s.seq=frame_to_send;
			cout<<"\nsender information\t"<<s.info.data<<endl;
			cout<<"\nsequence no.\t"<<s.seq<<endl;

			getch();
			turn='r';
			to_physical_layer(&s);
		}

	}
}

void from_network_layer(packet *buffer){
	(*buffer).data=i;
	i++;
}

void to_physical_layer(frame *s){
	data1=*s;
}

void wait_for_event_sender(event_type *e){
	static int timer=0;
	if(turn=='s'){
		timer++;
		//timer=0;
		return;
	}
	else{
		timer=0;
		*e=frame_arrival;
	}
}

void receiver(){
	static int frame_expected=0;
	frame s,r;
	event_type event;
	wait_for_event_receiver(&event);
	if(turn=='r'){
		if(event==frame_arrival){
			from_physical_layer(&r);
			if(r.seq==frame_expected){
				to_network_layer(&r.info);
				inc(frame_expected);
			}
			else{
				cout<<"\nReceiver:Acknowledge resent\n";
				getch();
				turn='s';
				to_physical_layer(&s);
			}
		}
	}
}

void wait_for_event_receiver(event_type *e){
	if(turn=='r'){
		*e=frame_arrival;
	}
}

void from_physical_layer(frame *buffer){
	*buffer=data1;
}

void to_network_layer(packet *buffer){
	cout<<"\nReceiver:Packet received\t"<<i-1;
	cout<<"\nAcknoledge sent \t";
	getch();
	if(i>tot_pack){
		disc=1;
		cout<<"\ndiscontinue\n";
	}
}