//////////////////////////  Server.c ////////////////

#include<io.h>
#include<stdio.h>
#include<winsock2.h>

#define MY_PORT		8989
#define MAXBUF		256

int main(int argc , char *argv[])
{
    WSADATA wsa;
    SOCKET sockfd , clientfd;
    struct sockaddr_in self;
	char buffer[MAXBUF];

    printf("\nInitialising Winsock...");
    if (WSAStartup(MAKEWORD(2,2),&wsa) != 0)
    {
        printf("Failed. Error Code : %d",WSAGetLastError());
        return 1;
    }

    printf("Initialised.\n");

	/*---create streaming socket---*/
    if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 )
	{
		perror("Socket");
		exit(errno);
	}

        printf("Socket created.\n");

	/*---initialize address/port structure---*/
	/* bzero(&self, sizeof(self));*/
	self.sin_family = AF_INET;
	self.sin_port = htons(MY_PORT);	  // Host to Network Short (16-bit)
	self.sin_addr.s_addr = INADDR_ANY;

	/*---assign a port number to the socket---*/
    if ( bind(sockfd, (struct sockaddr*)&self, sizeof(self)) != 0 )
	{
		perror("socket--bind");
		exit(errno);
	}

        puts("Bind done");

	/*---make it a "listening socket"---*/
	if ( listen(sockfd, 20) != 0 )
	{
		perror("socket--listen");
		exit(errno);
	}

        puts("Waiting for incoming connections...");

	/*---forever... ---*/
	while (1)
	{	struct sockaddr_in client_addr;
		int addrlen=sizeof(client_addr);

		/*---accept a connection (creating a data pipe)---*/
		clientfd = accept(sockfd, (struct sockaddr*)&client_addr, &addrlen);

		/*---To show the client's IP address and port number---*/
		printf("The IP address is : %s\n",inet_ntoa(client_addr.sin_addr));
		printf("The port number is : %u\n",htons(self.sin_port));

		/*---Loop for client's multiple requests*/
		while(1)
		{
		/*---memset is used to fill a block of memory or lse there will be garbage value---*/
		memset (buffer, 0, MAXBUF);

		/*---Receive data on socket---*/
		recv(clientfd, buffer, MAXBUF, 0);

		/*---Change string to reverse---*/
		strrev(buffer);

		/*---Change string to uppercase---*/
	    strupr(buffer);

		/*---Send string to server---*/
		send (clientfd, buffer, sizeof(buffer), 0);
		//send(clientfd, buffer, recv(clientfd, buffer, MAXBUF, 0), 0);

		/*---Find the legth of string---*/
		strlen(buffer);
		printf("number of bytes sent : %ld \n",strlen(buffer));

			while(1)
			{
				if (strlen(buffer) == 0)
				printf("client terminated\n");
				break;
			}

		}

		/*---close connection---*/
		close(clientfd);

	}

	/*---clean up (should never get here!)---*/
	close(sockfd);
    WSACleanup();
	return 0;
}