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/*

 * 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.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 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.

 *

 *  $Id: inet_network.c,v 1.2 2001-09-27 12:01:53 chris Exp $

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "@(#)inet_network.c      8.1 (Berkeley) 6/4/93";

#endif /* LIBC_SCCS and not lint */

#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.

 */

u_long

inet_network(cp)

        register const char *cp;

{

        register u_long val, base, n, i;

        register char c;

        u_long parts[4], *pp = parts;

again:

        val = 0; base = 10;

        if (*cp == '0')

                base = 8, cp++;

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

                base = 16, cp++;

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

                if (isdigit(c)) {

                        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 (*cp == '.') {

                if (pp >= parts + 3)

                        return (INADDR_NONE);

                *pp++ = val, cp++;

                goto again;

        }

        if (*cp && !isspace(*cp))

                return (INADDR_NONE);

        *pp++ = val;

        n = pp - parts;

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

                val <<= 8;

                val |= parts[i] & 0xff;

        }

        return (val);

}