/*

 * Copyright (c) 1983, 1990, 1993

 *    The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

/*

 * Portions Copyright (c) 1993 by Digital Equipment Corporation.

 *

 * 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, and that

 * the name of Digital Equipment Corporation not be used in advertising or

 * publicity pertaining to distribution of the document or software without

 * specific, written prior permission.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL

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

 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT

 * CORPORATION 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.

 */

/*

 * Portions Copyright (c) 1996-1999 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/types.h>

#include <sys/param.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <ctype.h>

#include <endian.h>

#include <stdint.h>

#include <stdlib.h>

#include <limits.h>

#include <errno.h>

/*

 * Ascii internet address interpretation routine.

 * The value returned is in network order.

 */

in_addr_t

__inet_addr(const char *cp) {

	struct in_addr val;

	if (__inet_aton(cp, &val))

		return (val.s_addr);

	return (INADDR_NONE);

}

weak_alias (__inet_addr, inet_addr)

/*

 * Check whether "cp" is a valid ascii representation

 * of an Internet address and convert to a binary address.

 * Returns 1 if the address is valid, 0 if not.

 * This replaces inet_addr, the return value from which

 * cannot distinguish between failure and a local broadcast address.

 */

int

__inet_aton(const char *cp, struct in_addr *addr)

{

	static const in_addr_t max[4] = { 0xffffffff, 0xffffff, 0xffff, 0xff };

	in_addr_t val;

	char c;

	union iaddr {

	  uint8_t bytes[4];

	  uint32_t word;

	} res;

	uint8_t *pp = res.bytes;

	int digit;

	int saved_errno = errno;

	__set_errno (0);

	res.word = 0;

	c = *cp;

	for (;;) {

		/*

		 * Collect number up to ``.''.

		 * Values are specified as for C:

		 * 0x=hex, 0=octal, isdigit=decimal.

		 */

		if (!isdigit(c))

			goto ret_0;

		{

			char *endp;

			unsigned long ul = strtoul (cp, (char **) &endp, 0);

			if (ul == ULONG_MAX && errno == ERANGE)

				goto ret_0;

			if (ul > 0xfffffffful)

				goto ret_0;

			val = ul;

			digit = cp != endp;

			cp = endp;

		}

		c = *cp;

		if (c == '.') {

			/*

			 * Internet format:

			 *	a.b.c.d

			 *	a.b.c	(with c treated as 16 bits)

			 *	a.b	(with b treated as 24 bits)

			 */

			if (pp > res.bytes + 2 || val > 0xff)

				goto ret_0;

			*pp++ = val;

			c = *++cp;

		} else

			break;

	}

	/*

	 * Check for trailing characters.

	 */

	if (c != '\0' && (!isascii(c) || !isspace(c)))

		goto ret_0;

	/*

	 * Did we get a valid digit?

	 */

	if (!digit)

		goto ret_0;

	/* Check whether the last part is in its limits depending on

	   the number of parts in total.  */

	if (val > max[pp - res.bytes])

	  goto ret_0;

	if (addr != NULL)

		addr->s_addr = res.word | htonl (val);

	__set_errno (saved_errno);

	return (1);

ret_0:

	__set_errno (saved_errno);

	return (0);

}

weak_alias (__inet_aton, inet_aton)

libc_hidden_def (__inet_aton)

libc_hidden_weak (inet_aton)