TCP echo client

/* TCP echo client  tcp_echo_clnt.c */
#include "unp.h"

void
str_cli(FILE *fp, int sockfd)
{
char sendline[MAXLINE], recvline[MAXLINE];

while (Fgets(sendline, MAXLINE, fp) != NULL) {

Writen(sockfd, sendline, strlen(sendline));

if (Readline(sockfd, recvline, MAXLINE) == 0)
err_quit("str_cli: server terminated prematurely");

Fputs(recvline, stdout);
}
}

int
main(int argc, char **argv)
{
int sockfd;
struct sockaddr_in servaddr;

if (argc != 2)
err_quit("usage: tcpcli <IPaddress>");

sockfd = Socket(AF_INET, SOCK_STREAM, 0);

bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(SERV_PORT);
Inet_pton(AF_INET, argv[1], &servaddr.sin_addr);

Connect(sockfd, (SA *) &servaddr, sizeof(servaddr));

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

exit(0);
}