/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/*******************************************************************************

 * The following function pr_inet_aton is based on the BSD function inet_aton

 * with some modifications. The license and copyright notices applying to this

 * function appear below. Modifications are also according to the license below.

 ******************************************************************************/

#include "prnetdb.h"

/*

 * 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.

 * 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 (c) 2004 by Internet Systems Consortium, Inc. ("ISC")

 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.

 *

 * 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.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC 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.

 */

#define XX 127

static const unsigned char index_hex[256] = {

    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,

    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,

    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, 0,  1,  2,  3,  4,  5,  6,  7,  8,

    9,  XX, XX, XX, XX, XX, XX, XX, 10, 11, 12, 13, 14, 15, XX, XX, XX, XX, XX,

    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,

    XX, XX, 10, 11, 12, 13, 14, 15, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,

    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,

    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,

    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,

    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,

    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,

    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,

    XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,

    XX, XX, XX, XX, XX, XX, XX, XX, XX,

};

static PRBool _isdigit(char c) { return c >= '0' && c <= '9'; }

static PRBool _isxdigit(char c) { return index_hex[(unsigned char)c] != XX; }

static PRBool _isspace(char c) { return c == ' ' || (c >= '\t' && c <= '\r'); }

#undef XX

int pr_inet_aton(const char* cp, PRUint32* addr) {

  PRUint32 val;

  int base, n;

  char c;

  PRUint8 parts[4];

  PRUint8* pp = parts;

  int digit;

  c = *cp;

  for (;;) {

    /*

     * Collect number up to ``.''.

     * Values are specified as for C:

     * 0x=hex, 0=octal, isdigit=decimal.

     */

    if (!_isdigit(c)) {

      return (0);

    }

    val = 0;

    base = 10;

    digit = 0;

    if (c == '0') {

      c = *++cp;

      if (c == 'x' || c == 'X') {

        base = 16, c = *++cp;

      } else {

        base = 8;

        digit = 1;

      }

    }

    for (;;) {

      if (_isdigit(c)) {

        if (base == 8 && (c == '8' || c == '9')) {

          return (0);

        }

        val = (val * base) + (c - '0');

        c = *++cp;

        digit = 1;

      } else if (base == 16 && _isxdigit(c)) {

        val = (val << 4) + index_hex[(unsigned char)c];

        c = *++cp;

        digit = 1;

      } 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 || val > 0xffU) {

        return (0);

      }

      *pp++ = val;

      c = *++cp;

    } else {

      break;

    }

  }

  /*

   * Check for trailing characters.

   */

  if (c != '\0' && !_isspace(c)) {

    return (0);

  }

  /*

   * Did we get a valid digit?

   */

  if (!digit) {

    return (0);

  }

  /*

   * Concoct the address according to

   * the number of parts specified.

   */

  n = pp - parts + 1;

  switch (n) {

    case 1: /*%< a -- 32 bits */

      break;

    case 2: /*%< a.b -- 8.24 bits */

      if (val > 0xffffffU) {

        return (0);

      }

      val |= (unsigned int)parts[0] << 24;

      break;

    case 3: /*%< a.b.c -- 8.8.16 bits */

      if (val > 0xffffU) {

        return (0);

      }

      val |= ((unsigned int)parts[0] << 24) | ((unsigned int)parts[1] << 16);

      break;

    case 4: /*%< a.b.c.d -- 8.8.8.8 bits */

      if (val > 0xffU) {

        return (0);

      }

      val |= ((unsigned int)parts[0] << 24) | ((unsigned int)parts[1] << 16) |

             ((unsigned int)parts[2] << 8);

      break;

  }

  *addr = PR_htonl(val);

  return (1);

}