/* Copyright (C) 2000-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@gnu.org>, 2000.

   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 <assert.h>

#include <langinfo.h>

#include <string.h>

/* Look up the value of the next multibyte character and return its numerical

   value if it is one of the digits known in the locale.  If *DECIDED is

   -1 this means it is not yet decided which form it is and we have to

   search through all available digits.  Otherwise we know which script

   the digits are from.  */

static inline int

indigit_value (const char **s, size_t *len, int *decided)

{

  int from_level;

  int to_level;

  const char *mbdigits[10];

  int i;

  int n;

  if (*decided != -1)

    from_level = to_level = *decided;

  else

    {

      from_level = 0;

      to_level = _NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_INDIGITS_MB_LEN) - 1;

      assert (from_level <= to_level);

    }

  /* In this round we get the pointer to the digit strings and also perform

     the first round of comparisons.  */

  for (n = 0; n < 10; ++n)

    {

      size_t dlen;

      /* Get the string for the digits with value N.  */

      mbdigits[n] = _NL_CURRENT (LC_CTYPE, _NL_CTYPE_INDIGITS0_MB + n);

      dlen = strlen (mbdigits[n]);

      if (from_level == 0 && dlen <= *len

	  && memcmp (*s, mbdigits[n], dlen) == 0)

	{

	  /* Found it.  */

	  *s += dlen;

	  *len -= dlen;

	  if (*decided == -1)

	    *decided = 0;

	  return n;

	}

      /* Advance the pointer to the next string.  */

      mbdigits[n] += dlen + 1;

    }

  /* Now perform the remaining tests.  */

  for (i = 1; i <= to_level; ++i)

    {

      /* Search all ten digits of this level.  */

      for (n = 0; n < 10; ++n)

	{

	  size_t dlen = strlen (mbdigits[n]);

	  if (i >= from_level && dlen <= *len

	      && memcmp (*s, mbdigits[n], dlen) == 0)

	    {

	      /* Found it.  */

	      *s += dlen;

	      *len -= dlen;

	      if (*decided == -1)

		*decided = from_level;

	      return n;

	    }

	  /* Advance the pointer to the next string.  */

	  mbdigits[n] += dlen + 1;

	}

    }

  /* If we reach this point no matching digit was found.  */

  return -1;

}