source: rtems/cpukit/libnetworking/libc/inet_addr.c @ b2b143f4

/*
 * ++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";
static char rcsid[] = "$Id$";
#endif /* LIBC_SCCS and not lint */

/* Since we compile with strict ANSI we need to undef it to get
 * prototypes for extensions
 */
#undef __STRICT_ANSI__

#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>

/*
 * Ascii internet address interpretation routine.
 * The value returned is in network order.
 */
u_long
inet_addr(cp)
        register 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)
        register const char *cp;
        struct in_addr *addr;
{
        register u_long val;
        register int base, n;
        register char c;
        u_int parts[4];
        register u_int *pp = parts;

        c = *cp;
        for (;;) {
                /*
                 * Collect number up to ``.''.
                 * Values are specified as for C:
                 * 0x=hex, 0=octal, isdigit=decimal.
                 */
                if (!isdigit((int)c))
                        return (0);
                val = 0; base = 10;
                if (c == '0') {
                        c = *++cp;
                        if (c == 'x' || c == 'X')
                                base = 16, c = *++cp;
                        else
                                base = 8;
                }
                for (;;) {
                        if (isascii((int)c) && isdigit((int)c)) {
                                val = (val * base) + (c - '0');
                                c = *++cp;
                        } else if (base == 16 && isascii((int)c) && isxdigit((int)c)) {
                                val = (val << 4) |
                                        (c + 10 - (islower((int)c) ? 'a' : 'A'));
                                c = *++cp;
                        } else
                                break;
                }
                if (c == '.') {
                        /*
                         * Internet format:
                         *      a.b.c.d
                         *      a.b.c   (with c treated as 16 bits)
                         *      a.b     (with b treated as 24 bits)
                         */
                        if (pp >= parts + 3)
                                return (0);
                        *pp++ = val;
                        c = *++cp;
                } else
                        break;
        }
        /*
         * Check for trailing characters.
         */
        if (c != '\0' && (!isascii((int)c) || !isspace((int)c)))
                return (0);
        /*
         * Concoct the address according to
         * the number of parts specified.
         */
        n = pp - parts + 1;
        switch (n) {

        case 0:
                return (0);             /* initial nondigit */

        case 1:                         /* a -- 32 bits */
                break;

        case 2:                         /* a.b -- 8.24 bits */
                if (val > 0xffffff)
                        return (0);
                val |= parts[0] << 24;
                break;

        case 3:                         /* a.b.c -- 8.8.16 bits */
                if (val > 0xffff)
                        return (0);
                val |= (parts[0] << 24) | (parts[1] << 16);
                break;

        case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
                if (val > 0xff)
                        return (0);
                val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
                break;
        }
        if (addr)
                addr->s_addr = htonl(val);
        return (1);
}