/* Copyright (C) 1996-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <ctype.h>

#include <stdlib.h>

#include <netinet/ether.h>

#include <netinet/if_ether.h>

struct ether_addr *

ether_aton_r (const char *asc, struct ether_addr *addr)

{

  size_t cnt;

  for (cnt = 0; cnt < 6; ++cnt)

    {

      unsigned int number;

      char ch;

      ch = _tolower (*asc++);

      if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f'))

	return NULL;

      number = isdigit (ch) ? (ch - '0') : (ch - 'a' + 10);

      ch = _tolower (*asc);

      if ((cnt < 5 && ch != ':') || (cnt == 5 && ch != '\0' && !isspace (ch)))

	{

	  ++asc;

	  if ((ch < '0' || ch > '9') && (ch < 'a' || ch > 'f'))

	    return NULL;

	  number <<= 4;

	  number += isdigit (ch) ? (ch - '0') : (ch - 'a' + 10);

	  ch = *asc;

	  if (cnt < 5 && ch != ':')

	    return NULL;

	}

      /* Store result.  */

      addr->ether_addr_octet[cnt] = (unsigned char) number;

      /* Skip ':'.  */

      ++asc;

    }

  return addr;

}

libc_hidden_def (ether_aton_r)