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

   This file is part of the GNU C Library.

   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 <string.h>

#include <netinet/ether.h>

#include <netinet/if_ether.h>

int

ether_line (const char *line, struct ether_addr *addr, char *hostname)

{

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

    {

      unsigned int number;

      char ch;

      ch = _tolower (*line++);

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

	return -1;

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

      ch = _tolower (*line);

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

	{

	  ++line;

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

	    return -1;

	  number <<= 4;

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

	  ch = *line;

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

	    return -1;

	}

      /* Store result.  */

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

      /* Skip ':'.  */

      if (ch != '\0')

	++line;

    }

  /* Skip initial whitespace.  */

  while (isspace (*line))

    ++line;

  if (*line == '#' || *line == '\0')

    /* No hostname.  */

    return -1;

  /* The hostname is up to the next non-space character.  */

  /* XXX This can cause trouble because the hostname might be too long

     but we have no possibility to check it here.  */

  while (*line != '\0' && *line != '#' && !isspace (*line))

    *hostname++ = *line++;

  *hostname = '\0';

  return 0;

}