xref: /illumos-gate/usr/src/lib/libc/port/inet/inet_network.c (revision 8a7aa2a5)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2001 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	All Rights Reserved	*/

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#include "lint.h"

#include <sys/types.h>

#include <netinet/in.h>

#include <ctype.h>

/*
 * Internet network address interpretation routine.
 * The library routines call this routine to interpret
 * network numbers.
 */
in_addr_t
inet_network(const char *cp)
{
	in_addr_t val;
	int base;
	ptrdiff_t n;
	char c;
	in_addr_t parts[4], *pp = parts;
	int i;

again:
	val = 0; base = 10;
	if (*cp == '0') {
		if (*++cp == 'x' || *cp == 'X')
			base = 16, cp++;
		else
			base = 8;
	}
	while ((c = *cp) != NULL) {
		if (isdigit(c)) {
			if ((c - '0') >= base)
				break;
			val = (val * base) + (c - '0');
			cp++;
			continue;
		}
		if (base == 16 && isxdigit(c)) {
			val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
			cp++;
			continue;
		}
		break;
	}
	if (pp >= parts + 4 || val > 0xff)
		return ((in_addr_t)-1);
	*pp++ = val;
	if (*cp == '.') {
		cp++;
		goto again;
	}
	if (*cp != '\0' && !isspace(*cp))
		return ((in_addr_t)-1);
	n = pp - parts;
	for (val = 0, i = 0; i < n; i++) {
		val <<= 8;
		val |= parts[i];
	}
	return (val);
}