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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2016-xxxx
license		=	bsd


%%	header

/**	@file	dk4fpe.h	Floating point exceptions.

	Note: Including this file disables optimization of
	floating point operations by use of compiler pragma directives.

	Use only in those modules in which you want to check for
	floating point exceptions.

	This header file should be the last file included by a module.
*/



/*	Pragmas differ on Windows and Unix/Linux to prevent optimization
	of floating point operations.
	At least one compiler bails out with error message for unknown
	pragma directives.
*/

#ifndef	_WIN32
/* +++ !Windows */
#ifdef __SUNPRO_C
/* +++ !Windows, SUN workshop compiler */
#if __SUNPRO_C > 0x570
#pragma	STDC FENV_ACCESS on
#endif
/* --- !Windows, SUN workshop compiler */
#else
/* +++ !Windows, ! SUN workshop compiler */
#pragma	STDC FENV_ACCESS on
/* --- !Windows, ! SUN workshop compiler */
#endif
/* --- !Windows */
#endif


#ifndef	DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif

#ifndef	DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif

#if	DK4_HAVE_MATH_H
#ifndef	MATH_H_INCLUDED
#ifdef	_WIN32
#define	_USE_MATH_DEFINES	1
#endif
#include <math.h>
#define	MATH_H_INCLUDED 1
#endif
#endif

#if	DK4_HAVE_FLOAT_H
#ifndef	FLOAT_H_INCLUDED
#include <float.h>
#define	FLOAT_H_INCLUDED 1
#endif
#endif

#ifndef	_WIN32
#if	DK4_HAVE_FENV_H
#ifndef	FENV_H_INCLUDED
#include <fenv.h>
#define	FENV_H_INCLUDED	1
#endif
#endif
#endif

#ifndef	DK4ERROR_H_INCLUDED
#include "dk4error.h"
#endif

#ifdef	_WIN32
/* +++ Windows */
#pragma fenv_access (on)
/* --- Windows */
#endif

#ifdef	_WIN32
/**	Floating point exception set.
*/
typedef	unsigned int	dk4_fpe_t;
#else
/**	Floating point exception set.
*/
typedef	int		dk4_fpe_t;
#endif

#ifdef	__cplusplus
extern "C" {
#endif


/**	Check floating point exception set for errors occured.
	@param	fpe	Floating point exception set.
	@param	erp	Error report, may be NULL.
	@return	1 if error exceptions are set, 0 if there is no
	error condition.

	Error codes:
	* DK4_E_MATH_INVALID<br>
	  if an invalid operation was performed,
	* DK4_E_MATH_DIVZERO<br>
	  if a division by zero (or small denominator) occured,
	* DK4_E_MATH_OVERFLOW<br>
	  if a range overflow occured (result too large),
	* DK4_E_MATH_UNDERFLOW<br>
	  if a range underflow occured (result too small).
*/

int
dk4fpe_check_error(dk4_fpe_t fpe, dk4_er_t *erp);


/**	Clear floating point exceptions.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.

	Error codes:
	* DK4_E_NOT_SUPPORTED<br>
	  if no functions for floating point exceptions are available,
	* DK4_E_SYSTEM<br>
	  if the feclearexcept() function indicated an error.
*/

int
dk4fpe_clear(dk4_er_t *erp);


/**	Obtain floating point exceptions.
	@param	dptr	Address of destination variable to store result.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.

	Error codes:
	* DK4_E_INVALID_ARGUMENTS<br>
	  if dptr is NULL,
	* DK4_E_NOT_SUPPORTED<br>
	  if no functions for floating point exceptions are available.
*/

int
dk4fpe_get(dk4_fpe_t *dptr, dk4_er_t *erp);


/**	Obtain and clear floating point exceptions.
	@param	dptr	Address of destination variable to store result.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.

	Error codes:
	* DK4_E_INVALID_ARGUMENTS<br>
	  if dptr is NULL,
	* DK4_E_NOT_SUPPORTED<br>
	  if no functions for floating point exceptions are available,
	* DK4_E_SYSTEM<br>
	  if the feclearexcept() function indicated an error.
*/

int
dk4fpe_get_clear(dk4_fpe_t *dptr, dk4_er_t *erp);


/**	Check a double value whether or not it is a finite number
	(not +/- INF, not NaN).
	@param	d	Value to check.
	@return	1 on success, 0 on error.
*/

int
dk4fpe_is_finite(double d) ;


/**	Check a double value whether or not it is a normalized number
	(not +/- INF, not NaN, not denormalized).
	@param	d	Value to check.
	@return	1 on success, 0 on error.
*/
int
dk4fpe_is_normal(double d);


#ifdef	__cplusplus
}
#endif


%%	module

#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;
}