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inet_aton.c

/* $Id: inet_aton.c,v 1.3 1999/05/13 16:35:56 karls Exp $ */

#ifdef HAVE_CONFIG_H
#include "autoconf.h"
#endif  /* HAVE_CONFIG_H */

#include "common.h"

#if !HAVE_INET_ATON

/*    $OpenBSD: inet_addr.c,v 1.5 1997/04/05 21:13:10 millert 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)
#if 0
static char sccsid[] = "@(#)inet_addr.c   8.1 (Berkeley) 6/17/93";
static char rcsid[] = "$From: inet_addr.c,v 8.5 1996/08/05 08:31:35 vixie Exp $";
#else
static char rcsid[] = "$OpenBSD: inet_addr.c,v 1.5 1997/04/05 21:13:10 millert Exp $";
#endif
#endif /* LIBC_SCCS and not lint */

#ifndef _COMMON_H_
#include <sys/types.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#endif  /* !_COMMON_H_ */
#include <ctype.h>

/*
 * Ascii internet address interpretation routine.
 * The value returned is in network order.
 */
#if 0
in_addr_t
inet_addr(cp)
      register const char *cp;
{
      struct in_addr val;

      if (inet_aton(cp, &val))
            return (val.s_addr);
      return (INADDR_NONE);
}
#endif  /* 0 */
/*
 * 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 in_addr_t 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);
}
#else
static void avoid_error __P((void));
static void avoid_error()
{
      avoid_error();
}
#endif  /* !HAVE_INET_ATON */

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