// sample_client_ip.c                           //
// * compile : gcc -o sample sample_client_ip.c //
// * stdout :                                   //
//   client send : 200.201.202.1                //
//   recv data : 200.201.202.1                  //


#include <stdio.h>
#include <string.h> // strtok
#include <stdlib.h> // atoi

typedef union _CLIENT_IP{
    char client_ip_c[4];
    unsigned int client_ip_i;
}CLIENT_IP;


unsigned int
send_client_ip(char* client_ip)
{
    CLIENT_IP client_union = {};
    char* ptr = strtok(client_ip, ".");
    client_union.client_ip_c[0] = atoi(ptr);

    for( int i = 0 ; (ptr = strtok(NULL, ".")) != NULL ; i++ )
    {
        client_union.client_ip_c[i+1] = atoi(ptr);
    }

    return client_union.client_ip_i;
}

int
recv_client_ip(unsigned int data, char* client_ip)
{
    CLIENT_IP client_union = {};
    client_union.client_ip_i = data;

    sprintf(client_ip, "%d.%d.%d.%d",
        (unsigned char)client_union.client_ip_c[0],
        (unsigned char)client_union.client_ip_c[1],
        (unsigned char)client_union.client_ip_c[2],
        (unsigned char)client_union.client_ip_c[3]);
    return 1;
}

int
main()
{
    char client_ip[] = "200.201.202.1";
    unsigned int send_data = send_client_ip(client_ip);

    char recv_data[100] = {0,};

    printf("client send : %d.%d.%d.%d \n",
        send_data & 0xFF,
        ( send_data >> 8 ) & 0xFF,
        ( send_data >> 16 ) & 0xFF,
        ( send_data >> 24 ) & 0xFF );
    recv_client_ip(send_data, recv_data);
    printf("recv data : %s\n", recv_data);

    return 1;
}