/*

 * Copyright (c) 1983, 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.

 */

/* Copyright (C) 2013-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <sys/types.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <ctype.h>

/*

 * Internet network address interpretation routine.

 * The library routines call this routine to interpret

 * network numbers.

 */

uint32_t

inet_network (const char *cp)

{

	uint32_t val, base, n, i;

	char c;

	uint32_t parts[4], *pp = parts;

	int digit;

again:

	val = 0; base = 10; digit = 0;

	if (*cp == '0')

		digit = 1, base = 8, cp++;

	if (*cp == 'x' || *cp == 'X')

		digit = 0, base = 16, cp++;

	while ((c = *cp) != 0) {

		if (isdigit(c)) {

			if (base == 8 && (c == '8' || c == '9'))

				return (INADDR_NONE);

			val = (val * base) + (c - '0');

			cp++;

			digit = 1;

			continue;

		}

		if (base == 16 && isxdigit(c)) {

			val = (val << 4) + (tolower (c) + 10 - 'a');

			cp++;

			digit = 1;

			continue;

		}

		break;

	}

	if (!digit)

		return (INADDR_NONE);

	if (pp >= parts + 4 || val > 0xff)

		return (INADDR_NONE);

	if (*cp == '.') {

		*pp++ = val, cp++;

		goto again;

	}

	while (isspace(*cp))

		cp++;

	if (*cp)

		return (INADDR_NONE);

	if (pp >= parts + 4 || val > 0xff)

		return (INADDR_NONE);

	*pp++ = val;

	n = pp - parts;

	for (val = 0, i = 0; i < n; i++) {

		val <<= 8;

		val |= parts[i] & 0xff;

	}

	return (val);

}