// Experiment 19: TCP client sends a string to the server; server returns its LENGTH
// CLIENT side
// Compile: gcc 19_tcp_string_length_client.c -o lenclient
// Run    : ./lenclient

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define PORT 2020
#define BUF  1024

int main() {
    int sock;
    struct sockaddr_in serv_addr;
    char buffer[BUF];

    sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock < 0) { perror("socket"); exit(1); }

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port   = htons(PORT);
    inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr);

    if (connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) < 0) {
        perror("connect"); exit(1);
    }

    printf("Enter a string: ");
    if (fgets(buffer, BUF, stdin) == NULL) return 1;
    buffer[strcspn(buffer, "\n")] = '\0';

    send(sock, buffer, strlen(buffer), 0);

    memset(buffer, 0, BUF);
    read(sock, buffer, BUF);
    printf("Server reply: %s\n", buffer);

    close(sock);
    return 0;
}