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/*
	WARNING: This file was generated by dkct.
	Changes you make here will be lost if dkct is run again!
	You should modify the original source and run dkct on it.
	Original source: dk4fpe.ctr
*/

/*
Copyright (C) 2016-2017, Dirk Krause

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above opyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
* Neither the name of the author nor the names of contributors may be used
  to endorse or promote products derived from this software without specific
  prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/**	@file dk4fpe.c The dk4fpe module.
*/


#line 200 "dk4fpe.ctr"

#include "dk4fpe.h"



#ifdef	_WIN32

/**	Exception set for errors.
*/
static const unsigned int	dk4fpe_errors	=
_SW_ZERODIVIDE | _SW_INVALID | _SW_OVERFLOW | _SW_UNDERFLOW;

#else

/**	Exception set for errors.
*/
static const int		dk4fpe_errors	=
FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW;

#endif




int
dk4fpe_check_error(dk4_fpe_t fpe, dk4_er_t *erp)
{
  int		 back	= 0;
  if ((dk4_fpe_t)0 != (dk4fpe_errors & fpe)) {
    back = 1;
#ifdef _WIN32
    if ((dk4_fpe_t)0 != (_SW_INVALID & fpe))
#else
    if ((dk4_fpe_t)0 != (FE_INVALID & fpe))
#endif
    {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_INVALID);
    }
    else
    {
#ifdef _WIN32
      if ((dk4_fpe_t)0 != (_SW_ZERODIVIDE & fpe))
#else
      if ((dk4_fpe_t)0 != (FE_DIVBYZERO & fpe))
#endif
      {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO);
      }
      else
      {
#ifdef	_WIN32
	if ((dk4_fpe_t)0 != (_SW_OVERFLOW & fpe))
#else
        if ((dk4_fpe_t)0 != (FE_OVERFLOW & fpe))
#endif
	{
          dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	}
	else
	{
#ifdef	_WIN32
	  if ((dk4_fpe_t)0 != (_SW_UNDERFLOW & fpe))
#else
	  if ((dk4_fpe_t)0 != (FE_UNDERFLOW & fpe))
#endif
	  {
            dk4error_set_simple_error_code(erp, DK4_E_MATH_UNDERFLOW);
	  }
	}
      }
    }
  }
  return back;
}


int
dk4fpe_clear(dk4_er_t *erp)
{
#ifdef	_WIN32
  _clearfp();
  return 1;
#else
#if	DK4_HAVE_FETESTEXCEPT
  int	back = 0;
  if (0 == feclearexcept(FE_ALL_EXCEPT)) {
    back = 1;
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_SYSTEM);
  }
  return back;
#else
  dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
  return 0;
#endif
#endif
}



int
dk4fpe_get(dk4_fpe_t *dptr, dk4_er_t *erp)
{
  int		 back = 0;
  if (NULL != dptr) {
#ifdef	_WIN32
    *dptr = (dk4_fpe_t)_statusfp();
    back = 1;
#else
#if	DK4_HAVE_FETESTEXCEPT
    *dptr = (dk4_fpe_t)fetestexcept(FE_ALL_EXCEPT);
    back = 1;
#else
    dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
#endif
#endif
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}



int
dk4fpe_get_clear(dk4_fpe_t *dptr, dk4_er_t *erp)
{
  int	 back	= 0;
  if (NULL != dptr) {
#ifdef	_WIN32
    *dptr = _clearfp();
    back = 1;
#else
#if	DK4_HAVE_FETESTEXCEPT
    *dptr = (dk4_fpe_t)fetestexcept(FE_ALL_EXCEPT);
    if (0 == feclearexcept(FE_ALL_EXCEPT)) {
      back = 1;
    } else {
      dk4error_set_simple_error_code(erp, DK4_E_SYSTEM);
    }
#else
    dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
#endif
#endif
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}



int
dk4fpe_is_finite(double d) 
{
  int		 back	= 0;
#ifdef	_WIN32
  back = ((0 != _finite(d)) ? 1 : 0);
#else
  back = ((0 != isfinite(d)) ? 1 : 0);
#endif
  return back;
}



int
dk4fpe_is_normal(double d)
{
  int		 back = 0;
#ifdef	_WIN32
  switch (_fpclass(d)) {
    case _FPCLASS_NN : case _FPCLASS_NZ :
    case _FPCLASS_PZ : case _FPCLASS_PN :
    {
      back = 1;
    } break;
  }
#else
  back = ((0 != isnormal(d)) ? 1 : 0);
#endif
  return back;
}