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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2017-xxxx
SPDX-License-Identifier:	BSD-3-Clause

%%	header

/**	@file	dk4math.h	Functions and macros not available on all platforms.

If some of the functions or macros rint(), isgreater(), isgreaterequal(),
isless() and islessequal() - typically defined in math.h - are missing,
this header file defines either
macros or static inline functions calling the provided fallback
functions dk4ma_rint(), dk4ma_isgreater(), dk4ma_isgreaterequal(),
dk4ma_isless() or dk4ma_islessequal().

Inline functions are used if both DK4_HAVE_INLINE and DK4_USE_INLINE
are enabled, macros are used otherwise.

Although the CERT C coding standard prefers use of inline functions over macros,
I prefer macros as the static inline functions
(a) create slightly larger object modules,
(b) create warnings for those static inline functions not used in the module and
(c) might create warnings if the compiler decides to use real functions
instead of generating inline code.

The dk4ma_rint() function in the module is always compiled to avoid
``empty compilation unit'' warnings. The other functions in this module
are only compiled if necessary.
*/

#ifndef	DK4CONF_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4conf.h"
#else
#include <dktools-4/dk4conf.h>
#endif
#endif

#if	DK4_HAVE_MATH_H
#ifndef	MATH_H_INCLUDED
#if	DK4_ON_WINDOWS
#ifndef	_USE_MATH_DEFINES
#define	_USE_MATH_DEFINES 1
#endif
#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

#ifdef	__cplusplus
extern "C" {
#endif

#if	(!(DK4_HAVE_RINT))
/**	Round value to next integer.
	@param	x	floating point valued.
	@return	Floating point value rounded to next integer.
*/
double
dk4ma_rint(double x);
#endif

#if	(!(DK4_HAVE_ISGREATER))
/**	Check whether a is greater than b.
	@param	a	Floating point value.
	@param	b	Floating point value.
	@return	Comparison result.
*/
int
dk4ma_isgreater(double a, double b);
#endif

#if	(!(DK4_HAVE_ISGREATEREQUAL))
/**	Check whether a is greater than or equal to b.
	@param	a	Floating point value.
	@param	b	Floating point value.
	@return	Comparison result.
*/
int
dk4ma_isgreaterequal(double a, double b);
#endif

#if (!(DK4_HAVE_ISLESS))
/**	Check whether a is less than b.
	@param	a	Floating point value.
	@param	b	Floating point value.
	@return	Comparison result.
*/
int
dk4ma_isless(double a, double b);
#endif

#if	(!(DK4_HAVE_ISLESSEQUAL))
/**	Check whether a is less than or equal to b.
	@param	a	Floating point value.
	@param	b	Floating point value.
	@return	Comparison result.
*/
int
dk4ma_islessequal(double a, double b);
#endif

/**	Check whether or not a double value is finite.
	@param	d	Value to check.
	@return	Nonzero for finite value, zero for infinite value or NaN.
*/
int
dk4ma_is_finite(double d);

/**	Check whether double value is in normalized representation.
	@param	d	Value to check.
	@return	Nonzero for normalized value, zero for non-normalized value.
*/
int
dk4ma_is_normal(double d);

#ifdef	__cplusplus
}
#endif




#if	(!(DK4_HAVE_RINT))
#if	DK4_HAVE_INLINE && DK4_USE_INLINE
static
inline
double
rint(double x)
{
	return (dk4ma_rint(x));
}
#else
/**	The rint() function rounds to next integer.
*/
#define	rint(x)	dk4ma_rint(x)
#endif
#endif


#if (!(DK4_HAVE_ISGREATER))
#if	DK4_HAVE_INLINE && DK4_USE_INLINE
/**	Compare two double values, check if left value is greater than right value.
	@param	a	Left value.
	@param	b	Right value.
	@return	Comparison result.
*/
static
inline
int
isgreater(double a, double b)
{
	return (dk4ma_isgreater(a,b));
}
#else
/**	Compare to values.
*/
#define	isgreater(a,b)	dk4ma_isgreater(a,b)
#endif
#endif


#if (!(DK4_HAVE_ISGREATEREQUAL))
#if	DK4_HAVE_INLINE && DK4_USE_INLINE
/**	Compare two double values, check if left value is greater than
	or equal to right value.
	@param	a	Left value.
	@param	b	Right value.
	@return	Comparison result.
*/
static
inline
int
isgreaterequal(double a, double b)
{
	return (dk4ma_isgreaterequal(a,b));
}
#else
/**	Compare to values.
*/
#define	isgreaterequal(a,b)	dk4ma_isgreaterequal(a,b)
#endif
#endif


#if (!(DK4_HAVE_ISLESS))
#if	DK4_HAVE_INLINE && DK4_USE_INLINE
/**	Compare two double values, check if left value is less than right value.
	@param	a	Left value.
	@param	b	Right value.
	@return	Comparison result.
*/
static
inline
int
isless(double a, double b)
{
	return (dk4ma_isless(a,b));
}
#else
/**	Compare to values.
*/
#define	isless(a,b)	dk4ma_isless(a,b)
#endif
#endif


#if (!(DK4_HAVE_ISLESSEQUAL))
#if	DK4_HAVE_INLINE && DK4_USE_INLINE
/**	Compare two double values, check if left value is less than
	or equal to right value.
	@param	a	Left value.
	@param	b	Right value.
	@return	Comparison result.
*/
static
inline
int
islessequal(double a, double b)
{
	return (dk4ma_islessequal(a,b));
}
#else
/**	Compare to values.
*/
#define	islessequal(a,b)	dk4ma_islessequal(a,b)
#endif
#endif



%%	module

#include "dk4conf.h"
#include "dk4math.h"



#if (!(DK4_HAVE_RINT))
double
dk4ma_rint(double x)
{
	return (floor(x+0.5));
}
#endif



#if	(!(DK4_HAVE_ISGREATER))
int
dk4ma_isgreater(double a, double b)
{
	int		back = 0;
#if DK4_HAVE_ISFINITE
	if ((isfinite(a)) && (isfinite(b))) {
#else
#if	DK4_HAVE__FINITE
	if ((_finite(a)) && (_finite(b))) {
#endif
#endif
		if (a > b) {
			back = 1;
		}
#if DK4_HAVE_ISFINITE
	}
#else
#if	DK4_HAVE__FINITE
	}
#endif
#endif
	return back;
}
#endif



#if	(!(DK4_HAVE_ISGREATEREQUAL))
int
dk4ma_isgreaterequal(double a, double b)
{
	int		back = 0;
#if DK4_HAVE_ISFINITE
	if ((isfinite(a)) && (isfinite(b))) {
#else
#if	DK4_HAVE__FINITE
	if ((_finite(a)) && (_finite(b))) {
#endif
#endif
		if (a >= b) {
			back = 1;
		}
#if DK4_HAVE_ISFINITE
	}
#else
#if	DK4_HAVE__FINITE
	}
#endif
#endif
	return back;
}
#endif



#if (!(DK4_HAVE_ISLESS))
int
dk4ma_isless(double a, double b)
{
	int		back = 0;
#if DK4_HAVE_ISFINITE
	if ((isfinite(a)) && (isfinite(b))) {
#else
#if	DK4_HAVE__FINITE
	if ((_finite(a)) && (_finite(b))) {
#endif
#endif
		if (a < b) {
			back = 1;
		}
#if DK4_HAVE_ISFINITE
	}
#else
#if	DK4_HAVE__FINITE
	}
#endif
#endif
	return back;
}
#endif



#if	(!(DK4_HAVE_ISLESSEQUAL))
int
dk4ma_islessequal(double a, double b)
{
	int		back = 0;
#if DK4_HAVE_ISFINITE
	if ((isfinite(a)) && (isfinite(b))) {
#else
#if	DK4_HAVE__FINITE
	if ((_finite(a)) && (_finite(b))) {
#endif
#endif
		if (a <= b) {
			back = 1;
		}
#if DK4_HAVE_ISFINITE
	}
#else
#if	DK4_HAVE__FINITE
	}
#endif
#endif
	return back;
}
#endif



int
dk4ma_is_finite(double d) 
{
  int		 back	= 0;
#if _WIN32
  back = ((0 != _finite(d)) ? 1 : 0);
#else
  back = ((0 != isfinite(d)) ? 1 : 0);
#endif
  return back;
}



int
dk4ma_is_normal(double d)
{
  int		 back = 0;
#if _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;
}



/* vim: set ai sw=4 ts=4 : */