/* Convert string for NaN payload to corresponding NaN.

   Copyright (C) 1997-2018 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 <ieee754.h>

#include <locale.h>

#include <math.h>

#include <stdlib.h>

#include <wchar.h>

/* If STR starts with an optional n-char-sequence as defined by ISO C

   (a sequence of ASCII letters, digits and underscores), followed by

   ENDC, return a NaN whose payload is set based on STR.  Otherwise,

   return a default NAN.  If ENDPTR is not NULL, set *ENDPTR to point

   to the character after the initial n-char-sequence.  */

FLOAT

STRTOD_NAN (const STRING_TYPE *str, STRING_TYPE **endptr, STRING_TYPE endc)

{

  const STRING_TYPE *cp = str;

  while ((*cp >= L_('0') && *cp <= L_('9'))

	 || (*cp >= L_('A') && *cp <= L_('Z'))

	 || (*cp >= L_('a') && *cp <= L_('z'))

	 || *cp == L_('_'))

    ++cp;

  FLOAT retval = NAN;

  if (*cp != endc)

    goto out;

  /* This is a system-dependent way to specify the bitmask used for

     the NaN.  We expect it to be a number which is put in the

     mantissa of the number.  */

  STRING_TYPE *endp;

  unsigned long long int mant;

  mant = STRTOULL (str, &endp, 0);

  if (endp == cp)

    SET_NAN_PAYLOAD (retval, mant);

 out:

  if (endptr != NULL)

    *endptr = (STRING_TYPE *) cp;

  return retval;

}

libc_hidden_def (STRTOD_NAN)