// client.c
// November 10, 2000
// Lisa Frye
// Based on Stevens, UNIX Network Programming, Vol 1, page 113
// Server for socket program to add two integers pass from client


#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>


#define SERV_PORT 9877
#define LISTENQ   1024
#define MAXLINE   512

struct args
{
  long arg1;
  long arg2;
};

struct result
{
  long sum;
};


void str_cli2(FILE *fp, int sockfd);


int
main(int argc, char **argv)
{
	int   sockfd;
	struct sockaddr_in	servaddr;
	struct hostent *hostEnt = 
	             (struct hostent *)malloc(sizeof(struct hostent));
	struct in_addr *IPaddr = 
	             (struct in_addr *)malloc(sizeof(struct in_addr));

	if (argc != 2)
	  {
		printf("usage: tcpcli <hostname>");
		exit(1);
	  }

	sockfd = socket(AF_INET, SOCK_STREAM, 0);

	bzero(&servaddr, sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_port = htons(SERV_PORT);
	hostEnt = gethostbyname(argv[1]);
	IPaddr = (struct in_addr *)hostEnt->h_addr;
	servaddr.sin_addr = *IPaddr;

	connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr));

	str_cli2(stdin, sockfd);		/* do it all */

	exit(0);
}



void str_cli2(FILE *fp, int sockfd)
{
	char			sendline[MAXLINE];
	struct args		args;
	struct result	result;

	while (fgets(sendline, MAXLINE, fp) != NULL) {
		if (sscanf(sendline, "%ld%ld", &args.arg1, &args.arg2) != 2) {
			printf("invalid input: %s", sendline);
			continue;
		}
		writen(sockfd, &args, sizeof(args));

		if (readn(sockfd, &result, sizeof(result)) == 0)
		  {
			perror("str_cli: server terminated prematurely");
			exit(-1);
		  }   // end if

		printf("%ld\n", result.sum);
	}
}