/*	$KAME: inet_pton.c,v 1.5 2001/08/20 02:32:40 itojun Exp $	*/

/* © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 * Copyright (c) 1996 by Internet Software Consortium.

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS

 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE

 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL

 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR

 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS

 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS

 * SOFTWARE.

 */

#include <sys/cdefs.h>

#ifndef __SYMBIAN32__

__FBSDID("$FreeBSD: src/lib/libc/net/inet_pton.c,v 1.11.14.1 2005/07/29 16:10:35 ume Exp $");

#endif//__SYMBIAN32__

#include <sys/param.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <stdapis/netinet/in.h>

#include <stdapis/arpa/inet.h>

#include <stdapis/arpa/nameser.h>

#include <string.h>

#include <errno.h>

/*

 * WARNING: Don't even consider trying to compile this on a system where

 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.

 */

static int	inet_pton4(const char *src, u_char *dst);

static int	inet_pton6(const char *src, u_char *dst);

/* int

 * inet_pton(af, src, dst)

 *	convert from presentation format (which usually means ASCII printable)

 *	to network format (which is usually some kind of binary format).

 * return:

 *	1 if the address was valid for the specified address family

 *	0 if the address wasn't valid (`dst' is untouched in this case)

 *	-1 if some other error occurred (`dst' is untouched in this case, too)

 * author:

 *	Paul Vixie, 1996.

 */

EXPORT_C int

inet_pton(int af, const char * __restrict src, void * __restrict dst)

{

	switch (af) {

	case AF_INET:

		return (inet_pton4(src, dst));

	case AF_INET6:

		return (inet_pton6(src, dst));

	default:

		errno = EAFNOSUPPORT;

		return (-1);

	}

	/* NOTREACHED */

}

/* int

 * inet_pton4(src, dst)

 *	like inet_aton() but without all the hexadecimal and shorthand.

 * return:

 *	1 if `src' is a valid dotted quad, else 0.

 * notice:

 *	does not touch `dst' unless it's returning 1.

 * author:

 *	Paul Vixie, 1996.

 */

static int

inet_pton4(const char *src, u_char *dst)

{

	static const char digits[] = "0123456789";

	int saw_digit, octets, ch;

	u_char tmp[NS_INADDRSZ], *tp;

	saw_digit = 0;

	octets = 0;

	*(tp = tmp) = 0;

	while ((ch = *src++) != '\0') {

		const char *pch;

		if ((pch = strchr(digits, ch)) != NULL) {

			u_int new = *tp * 10 + (pch - digits);

			if (saw_digit && *tp == 0)

				return (0);

			if (new > 255)

				return (0);

			*tp = new;

			if (! saw_digit) {

				if (++octets > 4)

					return (0);

				saw_digit = 1;

			}

		} else if (ch == '.' && saw_digit) {

			if (octets == 4)

				return (0);

			*++tp = 0;

			saw_digit = 0;

		} else

			return (0);

	}

	if (octets < 4)

		return (0);

	memcpy(dst, tmp, NS_INADDRSZ);

	return (1);

}

/* int

 * inet_pton6(src, dst)

 *	convert presentation level address to network order binary form.

 * return:

 *	1 if `src' is a valid [RFC1884 2.2] address, else 0.

 * notice:

 *	(1) does not touch `dst' unless it's returning 1.

 *	(2) :: in a full address is silently ignored.

 * credit:

 *	inspired by Mark Andrews.

 * author:

 *	Paul Vixie, 1996.

 */

static int

inet_pton6(const char *src, u_char *dst)

{

	static const char xdigits_l[] = "0123456789abcdef",

			  xdigits_u[] = "0123456789ABCDEF";

	u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;

	const char *xdigits, *curtok;

	int ch, saw_xdigit;

	u_int val;

	memset((tp = tmp), '\0', NS_IN6ADDRSZ);

	endp = tp + NS_IN6ADDRSZ;

	colonp = NULL;

	/* Leading :: requires some special handling. */

	if (*src == ':')

		if (*++src != ':')

			return (0);

	curtok = src;

	saw_xdigit = 0;

	val = 0;

	while ((ch = *src++) != '\0') {

		const char *pch;

		if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)

			pch = strchr((xdigits = xdigits_u), ch);

		if (pch != NULL) {

			val <<= 4;

			val |= (pch - xdigits);

			if (val > 0xffff)

				return (0);

			saw_xdigit = 1;

			continue;

		}

		if (ch == ':') {

			curtok = src;

			if (!saw_xdigit) {

				if (colonp)

					return (0);

				colonp = tp;

				continue;

			}

			if (tp + NS_INT16SZ > endp)

				return (0);

			*tp++ = (u_char) (val >> 8) & 0xff;

			*tp++ = (u_char) val & 0xff;

			saw_xdigit = 0;

			val = 0;

			continue;

		}

		if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&

		    inet_pton4(curtok, tp) > 0) {

			tp += NS_INADDRSZ;

			saw_xdigit = 0;

			break;	/* '\0' was seen by inet_pton4(). */

		}

		return (0);

	}

	if (saw_xdigit) {

		if (tp + NS_INT16SZ > endp)

			return (0);

		*tp++ = (u_char) (val >> 8) & 0xff;

		*tp++ = (u_char) val & 0xff;

	}

	if (colonp != NULL) {

		/*

		 * Since some memmove()'s erroneously fail to handle

		 * overlapping regions, we'll do the shift by hand.

		 */

		const int n = tp - colonp;

		int i;

		if (tp == endp)

			return (0);

		for (i = 1; i <= n; i++) {

			endp[- i] = colonp[n - i];

			colonp[n - i] = 0;

		}

		tp = endp;

	}

	if (tp != endp)

		return (0);

	memcpy(dst, tmp, NS_IN6ADDRSZ);

	return (1);

}

/*

 * Weak aliases for applications that use certain private entry points,

 * and fail to include <arpa/inet.h>.

 */

#ifndef __SYMBIAN32__

#undef inet_pton

__weak_reference(__inet_pton, inet_pton);

#else

#define inet_pton __inet_pton

#endif//__SYMBIAN32__