c tcp socket 域名解析

char * smtpIp(char * url)
{
    HOSTENT * iphost;
    char ipconfig[20];

if((iphost = gethostbyname(url)) != NULL)
    {
        int i = 0;

while(iphost->h_addr_list[i])
        {
            char ip[20];
            memcpy(&ip, inet_ntoa(*((struct in_addr *)iphost->h_addr_list[i])), 20);
            printf("%s", ip);

memset(ip, ‘\0‘, 20);
            i++;
        }
    }
}