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/* Copyright (C) 2000, 2004, 2008 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, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

/* 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 char *

outdigit_value (char *s, int n)

{

  const char *outdigit;

  size_t dlen;

  assert (0 <= n && n <= 9);

  outdigit = nl_langinfo (_NL_CTYPE_OUTDIGIT0_MB + n);

  dlen = strlen (outdigit);

  s -= dlen;

  while (dlen-- > 0)

    s[dlen] = outdigit[dlen];

  return s;

}

/* 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 wchar_t

outdigitwc_value (int n)

{

  assert (0 <= n && n <= 9);

  return nl_langinfo_wc (_NL_CTYPE_OUTDIGIT0_WC + n);

}

static char *

_i18n_number_rewrite (char *w, char *rear_ptr, char *end)

{

  char decimal[MB_LEN_MAX + 1];

  char thousands[MB_LEN_MAX + 1];

  /* "to_outpunct" is a map from ASCII decimal point and thousands-sep

     to their equivalent in locale. This is defined for locales which

     use extra decimal point and thousands-sep.  */

  wctrans_t map = wctrans ("to_outpunct");

  wint_t wdecimal = towctrans (L_('.'), map);

  wint_t wthousands = towctrans (L_(','), map);

  if (__builtin_expect (map != NULL, 0))

    {

      mbstate_t state;

      memset (&state, '\0', sizeof (state));

      size_t n = wcrtomb (decimal, wdecimal, &state);

      if (n == (size_t) -1)

        memcpy (decimal, ".", 2);

      else

        decimal[n] = '\0';

      memset (&state, '\0', sizeof (state));

      n = wcrtomb (thousands, wthousands, &state);

      if (n == (size_t) -1)

        memcpy (thousands, ",", 2);

      else

        thousands[n] = '\0';

    }

  /* Copy existing string so that nothing gets overwritten.  */

  char *src;

  int use_alloca = (rear_ptr - w) < 4096;

  if (__builtin_expect (use_alloca, 1))

    src = (char *) alloca (rear_ptr - w);

  else

    {

      src = (char *) malloc (rear_ptr - w);

      if (src == NULL)

        /* If we cannot allocate the memory don't rewrite the string.

           It is better than nothing.  */

        return w;

    }

  memcpy (src, w, rear_ptr - w);

  char *s = src + (rear_ptr - w);

  w = end;

  /* Process all characters in the string.  */

  while (--s >= src)

    {

      if (*s >= '0' && *s <= '9')

        {

          if (sizeof (char) == 1)

            w = (char *) outdigit_value ((char *) w, *s - '0');

          else

            *--w = (char) outdigitwc_value (*s - '0');

        }

      else if (__builtin_expect (map == NULL, 1) || (*s != '.' && *s != ','))

        *--w = *s;

      else

        {

          if (sizeof (char) == 1)

            {

              const char *outpunct = *s == '.' ? decimal : thousands;

              size_t dlen = strlen (outpunct);

              w -= dlen;

              while (dlen-- > 0)

                w[dlen] = outpunct[dlen];

            }

          else

            *--w = *s == '.' ? (char) wdecimal : (char) wthousands;

        }

    }

  if (! use_alloca)

    free (src);

  return w;

}