source: trunk/libs/newlib/src/newlib/libc/sys/linux/net/inet_addr.c

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

/*
 * ++Copyright++ 1983, 1990, 1993
 * -
 * 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.
 * 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.
 * -
 * 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.
 * -
 * --Copyright--
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
#include <sys/types.h>
#include <machine/endian.h>

#include <sys/param.h>

#include <netinet/in.h>
#include <arpa/inet.h>

#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>

/*
 * ASCII internet address interpretation routine.
 * The value returned is in network order.
 */
in_addr_t               /* XXX should be struct in_addr :( */
inet_addr(cp)
        const char *cp;
{
        struct in_addr val;

        if (inet_aton(cp, &val))
                return (val.s_addr);
        return (INADDR_NONE);
}

/* 
 * 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(cp, addr)
        const char *cp;
        struct in_addr *addr;
{
        u_long parts[4];
        in_addr_t val;
        char *c;
        char *endptr;
        int gotend, n;

        c = (char *)cp;
        n = 0;
        /*
         * Run through the string, grabbing numbers until
         * the end of the string, or some error
         */
        gotend = 0;
        while (!gotend) {
                errno = 0;
                val = strtoul(c, &endptr, 0);

                if (errno == ERANGE)    /* Fail completely if it overflowed. */
                        return (0);
                
                /* 
                 * If the whole string is invalid, endptr will equal
                 * c.. this way we can make sure someone hasn't
                 * gone '.12' or something which would get past
                 * the next check.
                 */
                if (endptr == c)
                        return (0);
                parts[n] = val;
                c = endptr;

                /* Check the next character past the previous number's end */
                switch (*c) {
                case '.' :
                        /* Make sure we only do 3 dots .. */
                        if (n == 3)     /* Whoops. Quit. */
                                return (0);
                        n++;
                        c++;
                        break;

                case '\0':
                        gotend = 1;
                        break;

                default:
                        if (isspace((unsigned char)*c)) {
                                gotend = 1;
                                break;
                        } else
                                return (0);     /* Invalid character, so fail */
                }

        }

        /*
         * Concoct the address according to
         * the number of parts specified.
         */

        switch (n) {
        case 0:                         /* a -- 32 bits */
                /*
                 * Nothing is necessary here.  Overflow checking was
                 * already done in strtoul().
                 */
                break;
        case 1:                         /* a.b -- 8.24 bits */
                if (val > 0xffffff || parts[0] > 0xff)
                        return (0);
                val |= parts[0] << 24;
                break;

        case 2:                         /* a.b.c -- 8.8.16 bits */
                if (val > 0xffff || parts[0] > 0xff || parts[1] > 0xff)
                        return (0);
                val |= (parts[0] << 24) | (parts[1] << 16);
                break;

        case 3:                         /* a.b.c.d -- 8.8.8.8 bits */
                if (val > 0xff || parts[0] > 0xff || parts[1] > 0xff ||
                    parts[2] > 0xff)
                        return (0);
                val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
                break;
        }

        if (addr != NULL)
                addr->s_addr = htonl(val);
        return (1);
}

/*
 * Weak aliases for applications that use certain private entry points,
 * and fail to include <arpa/inet.h>.
 */
#undef inet_addr
__weak_reference(__inet_addr, inet_addr);
#undef inet_aton
__weak_reference(__inet_aton, inet_aton);