/* 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 <stdbool.h>

#include <wchar.h>

#include <wctype.h>

#include <scratch_buffer.h>

#include "../locale/outdigits.h"

#include "../locale/outdigitswc.h"

static CHAR_T *

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

{

#ifdef COMPILE_WPRINTF

# define decimal NULL

# define thousands NULL

#else

  char decimal[MB_LEN_MAX + 1];

  char thousands[MB_LEN_MAX + 1];

#endif

  /* "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);

#ifndef COMPILE_WPRINTF

  if (__glibc_unlikely (map != NULL))

    {

      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';

    }

#endif

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

  CHAR_T *src;

  struct scratch_buffer buffer;

  scratch_buffer_init (&buffer);

  if (!scratch_buffer_set_array_size (&buffer, rear_ptr - w, sizeof (CHAR_T)))

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

       It is better than nothing.  */

    return w;

  src = buffer.data;

  CHAR_T *s = (CHAR_T *) __mempcpy (src, w,

				    (rear_ptr - w) * sizeof (CHAR_T));

  w = end;

  /* Process all characters in the string.  */

  while (--s >= src)

    {

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

	{

	  if (sizeof (CHAR_T) == 1)

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

	  else

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

	}

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

	*--w = *s;

      else

	{

	  if (sizeof (CHAR_T) == 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_T) wdecimal : (CHAR_T) wthousands;

	}

    }

  scratch_buffer_free (&buffer);

  return w;

}