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Subversion Repositories openrisc_2011-10-31

[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [inet_addr.c] - Blame information for rev 173

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1 30 unneback
/*
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 * ++Copyright++ 1983, 1990, 1993
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 * -
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 * Copyright (c) 1983, 1990, 1993
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 *    The Regents of the University of California.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. All advertising materials mentioning features or use of this software
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 *    must display the following acknowledgement:
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 *      This product includes software developed by the University of
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 *      California, Berkeley and its contributors.
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 * 4. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 * -
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 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
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 *
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 * Permission to use, copy, modify, and distribute this software for any
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 * purpose with or without fee is hereby granted, provided that the above
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 * copyright notice and this permission notice appear in all copies, and that
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 * the name of Digital Equipment Corporation not be used in advertising or
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 * publicity pertaining to distribution of the document or software without
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 * specific, written prior permission.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
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 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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 * SOFTWARE.
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 * -
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 * --Copyright--
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 */
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
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static char rcsid[] = "$Id: inet_addr.c,v 1.2 2001-09-27 12:01:53 chris Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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/*
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 * Ascii internet address interpretation routine.
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 * The value returned is in network order.
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 */
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u_long
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inet_addr(cp)
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        register const char *cp;
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{
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        struct in_addr val;
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        if (inet_aton(cp, &val))
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                return (val.s_addr);
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        return (INADDR_NONE);
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}
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/*
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 * Check whether "cp" is a valid ascii representation
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 * of an Internet address and convert to a binary address.
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 * Returns 1 if the address is valid, 0 if not.
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 * This replaces inet_addr, the return value from which
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 * cannot distinguish between failure and a local broadcast address.
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 */
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int
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inet_aton(cp, addr)
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        register const char *cp;
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        struct in_addr *addr;
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{
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        register u_long val;
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        register int base, n;
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        register char c;
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        u_int parts[4];
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        register u_int *pp = parts;
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        c = *cp;
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        for (;;) {
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                /*
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                 * Collect number up to ``.''.
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                 * Values are specified as for C:
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                 * 0x=hex, 0=octal, isdigit=decimal.
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                 */
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                if (!isdigit((int)c))
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                        return (0);
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                val = 0; base = 10;
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                if (c == '0') {
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                        c = *++cp;
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                        if (c == 'x' || c == 'X')
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                                base = 16, c = *++cp;
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                        else
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                                base = 8;
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                }
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                for (;;) {
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                        if (isascii((int)c) && isdigit((int)c)) {
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                                val = (val * base) + (c - '0');
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                                c = *++cp;
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                        } else if (base == 16 && isascii((int)c) && isxdigit((int)c)) {
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                                val = (val << 4) |
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                                        (c + 10 - (islower((int)c) ? 'a' : 'A'));
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                                c = *++cp;
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                        } else
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                                break;
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                }
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                if (c == '.') {
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                        /*
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                         * Internet format:
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                         *      a.b.c.d
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                         *      a.b.c   (with c treated as 16 bits)
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                         *      a.b     (with b treated as 24 bits)
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                         */
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                        if (pp >= parts + 3)
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                                return (0);
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                        *pp++ = val;
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                        c = *++cp;
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                } else
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                        break;
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        }
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        /*
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         * Check for trailing characters.
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         */
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        if (c != '\0' && (!isascii((int)c) || !isspace((int)c)))
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                return (0);
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        /*
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         * Concoct the address according to
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         * the number of parts specified.
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         */
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        n = pp - parts + 1;
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        switch (n) {
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        case 0:
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                return (0);              /* initial nondigit */
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        case 1:                         /* a -- 32 bits */
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                break;
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        case 2:                         /* a.b -- 8.24 bits */
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                if (val > 0xffffff)
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                        return (0);
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                val |= parts[0] << 24;
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                break;
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        case 3:                         /* a.b.c -- 8.8.16 bits */
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                if (val > 0xffff)
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                        return (0);
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                val |= (parts[0] << 24) | (parts[1] << 16);
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                break;
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        case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
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                if (val > 0xff)
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                        return (0);
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                val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
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                break;
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        }
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        if (addr)
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                addr->s_addr = htonl(val);
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        return (1);
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}

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