address_end

SFL
Version 2.11

`address_end_point`

#include "sflsock.h"
int
address_end_point (
    const char *host,                   /*  Name of host, "" = localhost     */
    const char *service,                /*  Service name or port as string   */
    const char *protocol,               /*  Protocol "tcp" or "udp"          */
    struct sockaddr_in *sin             /*  Block for formatted address      */
)

Synopsis

Formats an address block (struct sockaddr_in) for the specified host and service (port) information. Returns 0 if okay, SOCKET_ERROR if there was an error, in which case you can call connect error () to get the reason for the error. This may be one of:

IP NOSOCKETS Sockets not supported on this system
IP BADHOST Host is not known

Source Code - (sflsock.c)

{
#if (defined (DOES_SOCKETS))
    struct hostent
        *phe;                           /*  Host information entry           */
    struct servent
        *pse;                           /*  Service information entry        */
    char
        hostname [MAXHOSTNAMELEN + 1];  /*  Name of this system              */
    int
        feedback = 0;                   /*  Assume everything works          */

    ASSERT (service && *service);
    ASSERT (protocol && *protocol);
    ASSERT (sin);

    connect_error_value = IP_NOERROR;   /*  Assume no errors                 */
    memset ((void *) sin, 0, sizeof (*sin));
    sin-> sin_family = AF_INET;

    /*  Map service name to a port number                                    */
    pse = getservbyname (service, protocol);
    if (pse)
        sin-> sin_port = htons ((short) (ntohs (pse-> s_port)));
    else
        sin-> sin_port = htons ((short) (atoi (service)));

    /*  Map host name to IP address, allowing for dotted decimal             */
    if (host && strused (host))
        strcpy (hostname, host);
    else
        strcpy (hostname, "127.0.0.1");

    /*  Check if it's a valid IP address first                               */
    sin-> sin_addr.s_addr = inet_addr (hostname);
    if (sin-> sin_addr.s_addr == INADDR_NONE)
      {
        /*  Not a dotted address -- try to translate the name                */
        phe = gethostbyname (hostname);
        if (phe)
            memcpy ((void *) &sin-> sin_addr, phe-> h_addr, phe-> h_length);
        else
          {                             /*  Cannot map to host               */
            connect_error_value = IP_BADHOST;
            feedback = (int) SOCKET_ERROR;
          }
      }
    return (feedback);

#else
    connect_error_value = IP_NOSOCKETS;
    return ((int) SOCKET_ERROR);        /*  Sockets not supported            */
#endif
}

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IP NOSOCKETS	Sockets not supported on this system
IP BADHOST	Host is not known