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From:	=?ISO-8859-1?Q?Ren=E9_Berber?= <rberber AT prodigy DOT net DOT mx>
Subject:	Re: inet_pton() error. Does Cygwin support inet_pton()?
Date:	Fri, 17 Jun 2005 09:35:59 -0500
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Fernando Barsoba wrote:
> 
> I'm trying to use the function inet_pton(), but I found the following
> error when trying to build the application with Eclipse/CDT on Cygwin:
[snip]

If you don't need IPv6 in your application you can add tbe following implementation:

#ifdef __CYGWIN__

/* From:
 *  UNIX Network Programming: Sockets Introduction
 *  By Andrew M. Rudoff, Bill Fenner, W. Richard Stevens.
 *  Prentice Hall PTR. Feb 27, 2004.
 */
#define INET_ADDRSTRLEN       16       /* for IPv4 dotted-decimal */

int inet_pton(int family, const char *strptr, void *addrptr)
{
    if (family == AF_INET) {
        struct in_addr in_val;

        if (inet_aton(strptr, &in_val)) {
            memcpy(addrptr, &in_val, sizeof(struct in_addr));
            return (1);
        }
        return (0);
    }
    errno = EAFNOSUPPORT;
    return (-1);
}

const char *inet_ntop(int family, const void *addrptr, char *strptr, size_t len)
{
    const u_char *p = (const u_char *) addrptr;

    if (family == AF_INET) {
        char    temp[INET_ADDRSTRLEN];

        snprintf(temp, sizeof(temp), "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
        if (strlen(temp) >= len) {
            errno = ENOSPC;
            return (NULL);
        }
        strcpy(strptr, temp);
        return (strptr);
    }
    errno = EAFNOSUPPORT;
    return (NULL);
}

#endif


I've used this and getaddrinfo() from the postgress port to compile clamsmtpd,
and it works fine.

HTH,
-- 
René Berber


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