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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2014-xxxx
license		=	bsd



%%	header

/**	@file	dk3madlc.h	Conversion from double to long,
	unsigned long, long long, unsigned long long, intmax_t, uintmax_t,
	dk3_im_t and dk3_um_t.
*/

#include <dk3conf.h>

#include <stdio.h>
#if DK3_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if DK3_HAVE_STDINT
#include <stdint.h>
#endif
#if DK3_HAVE_INTTYPES_H
#include <inttypes.h>
#endif
#if DK3_HAVE_LIMITS_H
#include <limits.h>
#endif
#if DK3_HAVE_MATH_H
#include <math.h>
#endif
#if DK3_HAVE_FLOAT_H
#include <float.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif

/**	Convert double number to size.
	@param	v	Value to convert.
	@param	ec	Pointer to error code variable, may be NULL.
	Set to DK3_ERROR_MATH_OUT_OF_RANGE for negative v values,
	DK3_ERROR_MATH_OVERFLOW for values too large.
	@return	Conversion result.
*/
size_t
dk3ma_d_to_sz_ok(double v, int *ec);

/**	Convert double value to long.
	@param	x	Double value.
	@param	ec	Pointer to error code variable.
	Set to DK3_ERROR_MATH_OVERFLOW if the absolute value is too large.
	@return	Conversion result.
*/
long
dk3ma_d_to_l_ok(double x, int *ec);

/**	Convert double value to unsigned long.
	@param	x	Double value.
	@param	ec	Pointer to error code variable.
	Set to DK3_ERROR_MATH_OUT_OF_RANGE for negative v values,
	DK3_ERROR_MATH_OVERFLOW for values too large.
	@return	Conversion result.
*/
unsigned long
dk3ma_d_to_ul_ok(double x, int *ec);

#if DK3_HAVE_LONG_LONG

/**	Convert double to long long.
	@param	x	Value to convert.
	@param	ec	Pointer to error code variable, may be NULL.
	Set to DK3_ERROR_MATH_OVERFLOW if the absolute value is too large.
	@return	Conversion result.
*/
long long
dk3ma_d_to_ll_ok(double x, int *ec);

/**	Convert double to unsigned long long.
	@param	x	Value to convert.
	@param	ec	Pointer to error code variable, may be NULL.
	Set to DK3_ERROR_MATH_OUT_OF_RANGE for negative v values,
	DK3_ERROR_MATH_OVERFLOW for values too large.
	@return	Conversion result.
*/
unsigned long long
dk3ma_d_to_ull_ok(double x, int *ec);

#endif


#if DK3_HAVE_INTMAX_T

/**	Convert double to intmax_t.
	@param	x	Value to convert.
	@param	ec	Pointer to error code variable, may be NULL.
	Set to DK3_ERROR_MATH_OVERFLOW if the absolute value is too large.
	@return	Conversion result.
*/
intmax_t
dk3ma_d_to_intmax_t_ok(double x, int *ec);

/**	Convert double to uintmax_t.
	@param	x	Value to convert.
	@param	ec	Pointer to error code variable, may be NULL.
	Set to DK3_ERROR_MATH_OUT_OF_RANGE for negative v values,
	DK3_ERROR_MATH_OVERFLOW for values too large.
	@return	Conversion result.
*/
uintmax_t
dk3ma_d_to_uintmax_t_ok(double x, int *ec);

#endif

/**	Convert double precision floating point number to dk3_im_t.
	@param	x	Value to convert.
	@param	ec	Pointer to error code variable, may be NULL.
	Set to DK3_ERROR_MATH_OVERFLOW if the absolute value is too large.
	@return	Conversion result.
*/
dk3_im_t
dk3ma_d_to_im_ok(double x, int *ec);

/**	Convert double precision floating point number to dk3_um_t.
	@param	x	Value to convert.
	@param	ec	Pointer to error code variable, may be NULL.
	Set to DK3_ERROR_MATH_OUT_OF_RANGE for negative v values,
	DK3_ERROR_MATH_OVERFLOW for values too large.
	@return	Conversion result.
*/
dk3_um_t
dk3ma_d_to_um_ok(double x, int *ec);

#ifdef __cplusplus
}
#endif

%%	module



#include "dk3ma.h"



$!trace-include



/* formerly DK3_HAVE_COMPILER_CONVERSIONS */
#if 1



size_t
dk3ma_d_to_sz_ok(double v, int *ec)
{
  size_t	back	= 0;
  $? "+ dk3ma_d_to_sz_ok %lg", v
  if (0.0 <= v) {
    if ((double)DK3_SIZE_T_MAX >= v) {	$? ". size ok"
      back = (size_t)v;
    } else {
      if (NULL != ec) {			$? "! overflow"
        *ec = DK3_ERROR_MATH_OVERFLOW;
      }
    }
  } else {
    if (NULL != ec) {			$? "! out of range"
      *ec = DK3_ERROR_MATH_OUT_OF_RANGE;
    }
  } $? "- dk3ma_d_to_sz_ok %lu", (unsigned long)back
  return back;
}


 
long
dk3ma_d_to_l_ok(double x, int *ec)
{
  long		back	= 0L;
  $? "+ dk3ma_d_to_l_ok %lg", x
  if ((double)DK3_L_MIN <= x) {
    if ((double)DK3_L_MAX >= x) {
      back = (long)x;
    } else {
      back = DK3_L_MAX;
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    }
  } else {
    back = DK3_L_MIN;
    if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
  } $? "- dk3ma_d_to_l_ok %ld", back
  return back;
}



unsigned long
dk3ma_d_to_ul_ok(double x, int *ec)
{
  unsigned long	back	= 0UL;
  $? "+ dk3ma_d_to_ul_ok %lg", x
  if (0.0 <= x) {
    if ((double)DK3_UL_MAX >= x) {
      back = (unsigned long)x;
    } else {
      back = DK3_UL_MAX;
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OUT_OF_RANGE; }
    }
  } else {
    back = 0UL;
    if (NULL != ec) { *ec = DK3_ERROR_MATH_OUT_OF_RANGE; }
  } $? "- dk3ma_d_to_ul_ok %lu", back
  return back;
}



#if DK3_HAVE_LONG_LONG

long long
dk3ma_d_to_ll_ok(double x, int *ec)
{
  long long	back	= 0LL;
  $? "+ dk3ma_d_to_ll_ok %lg", x
  if ((double)DK3_LL_MIN <= x) {
    if ((double)DK3_LL_MAX >= x) {
      back = (long long)x;
    } else {
      back = DK3_LL_MAX;
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    }
  } else {
    back = DK3_LL_MIN;
    if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
  } $? "- dk3ma_d_to_ll_ok %lld", back
  return back;
}



unsigned long long
dk3ma_d_to_ull_ok(double x, int *ec)
{
  unsigned long long	back	= 0ULL;
  $? "+ dk3ma_d_to_ull_ok %lg", x
  if (0.0 <= x) {
    if ((double)DK3_ULL_MAX >= x) {
      back = (unsigned long long)x;
    } else {
      back = DK3_ULL_MAX;
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    }
  } else {
    if (NULL != ec) { *ec = DK3_ERROR_MATH_OUT_OF_RANGE; }
  } $? "- dk3ma_d_to_ull_ok %llu", back
  return back;
}

#endif


#if DK3_HAVE_INTMAX_T

intmax_t
dk3ma_d_to_intmax_t_ok(double x, int *ec)
{
  intmax_t	back	= DK3_INTMAX_T_0;
  $? "+ dk3ma_d_to_intmax_t_ok %lg", x
  if ((double)DK3_INTMAX_T_MIN <= x) {
    if ((double)DK3_INTMAX_T_MAX >= x) {
      back = (intmax_t)x;
    } else {
      back = DK3_INTMAX_T_MAX;
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    }
  } else {
    back = DK3_INTMAX_T_MIN;
    if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
  } $? "- dk3ma_d_to_intmax_t_ok %jd", back
  return back;
}



uintmax_t
dk3ma_d_to_uintmax_t_ok(double x, int *ec)
{
  uintmax_t	back	=	DK3_UINTMAX_T_0;
  $? "+ dk3ma_d_to_uintmax_t_ok %lg", x
  if (0.0 <= x) {
    if ((double)DK3_UINTMAX_T_MAX >= x) {
      back = (uintmax_t)x;
    } else {
      back = DK3_UINTMAX_T_MAX;
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    }
  } else {
    if (NULL != ec) { *ec = DK3_ERROR_MATH_OUT_OF_RANGE; }
  } $? "- dk3ma_d_to_uintmax_t_ok %ju", back
  return back;
}

#endif



dk3_im_t
dk3ma_d_to_im_ok(double x, int *ec)
{
#if DK3_HAVE_INTMAX_T
  return (dk3ma_d_to_intmax_t_ok(x, ec));
#else
#if DK3_HAVE_LONG_LONG
  return (dk3ma_d_to_ll_ok(x, ec));
#else
  return (dk3ma_d_to_l_ok(x, ec));
#endif
#endif
}



dk3_um_t
dk3ma_d_to_um_ok(double x, int *ec)
{
#if DK3_HAVE_INTMAX_T
  return (dk3ma_d_to_uintmax_t_ok(x, ec));
#else
#if DK3_HAVE_LONG_LONG
  return (dk3ma_d_to_ull_ok(x, ec));
#else
  return (dk3ma_d_to_ul_ok(x, ec));
#endif
#endif
}



#else
/* if 1, formerly if DK3_HAVE_COMPILER_CONVERSIONS */


/*	If you see the error message below during build process, you have
	disabled compiler conversions when running the configure script.
	During the last 10 year I did not see any compiler doing
	type casts from double to integers wrong, so the default is to
	enable compiler conversions.
	If you are really sure your compiler is doing type casts from
	double to integer types wrong, remove the error compiler directive
	below.
	Note: The code for manual conversion from double to integers
	is not well-tested as on all my systems the compilers type casts
	do fine. Make sure you know what you are doing.
*/
#error	"Compiler conversions turned off! See comment section above!"



#if DK3_HAVE_INTMAX_T
/* + uintmax_t */
#if DK3_SIZEOF_INTMAX_T > 2
#if DK3_SIZEOF_INTMAX_T > 4
#if DK3_SIZEOF_INTMAX_T > 8
#error "Can not handle such a large uintmax_t!"
#else
/*  8 */
#if DK3_HAVE_LONG_LONG
/**	First bit of a dk3_um_t.
*/
#define	DK3_UM_FIRST_BIT	(9223372036854775808ULL)
#else
/**	First bit of a dk3_um_t.
*/
#define	DK3_UM_FIRST_BIT	(9223372036854775808UL)
#endif
/**	First bit of a dk3_um_t written as double.
*/
#define	DK3_UM_FIRST_DOUBLE	(9223372036854775808.0)
#endif
#else
/*  4 */
#if DK3_HAVE_LONG_LONG
/**	First bit of a dk3_um_t.
*/
#define	DK3_UM_FIRST_BIT	(2147483648ULL)
#else
/**	First bit of a dk3_um_t.
*/
#define	DK3_UM_FIRST_BIT	(2147483648UL)
#endif
/**	First bit of a dk3_um_t written as double.
*/
#define	DK3_UM_FIRST_DOUBLE	(2147483648.0)
#endif
#else
/*  2 */
#if DK3_HAVE_LONG_LONG
/**	First bit of a dk3_um_t.
*/
#define	DK3_UM_FIRST_BIT	(32768ULL)
#else
/**	First bit of a dk3_um_t.
*/
#define	DK3_UM_FIRST_BIT	(32768UL)
#endif
/**	First bit of a dk3_um_t written as double.
*/
#define	DK3_UM_FIRST_DOUBLE	(32768.0)
#endif
/* - uintmax_t */
#else
#if DK3_HAVE_LONG_LONG
/* + unsigned long long */
#if DK3_SIZEOF_LONG_LONG > 2
#if DK3_SIZEOF_LONG_LONG > 4
#if DK3_SIZEOF_LONG_LONG > 8
#error "Can not handle such a large unsigned long long!"
#else
/*  8 */
/**	First bit of a dk3_um_t.
*/
#define	DK3_UM_FIRST_BIT	(9223372036854775808ULL)
/**	First bit of a dk3_um_t written as double.
*/
#define	DK3_UM_FIRST_DOUBLE	(9223372036854775808.0)
#endif
#else
/*  4 */
/**	First bit of a dk3_um_t.
*/
#define	DK3_UM_FIRST_BIT	(2147483648ULL)
/**	First bit of a dk3_um_t written as double.
*/
#define	DK3_UM_FIRST_DOUBLE	(2147483648.0)
#endif
#else
/*  2*/
/**	First bit of a dk3_um_t.
*/
#define	DK3_UM_FIRST_BIT	(32768ULL)
/**	First bit of a dk3_um_t written as double.
*/
#define	DK3_UM_FIRST_DOUBLE	(32768.0)
#endif
/* - unsigned long long */
#else
/* + unsigned long */
#if DK3_SIZEOF_LONG > 2
#if DK3_SIZEOF_LONG > 4
#if DK3_SIZEOF_LONG > 8
#error "Can not handle such a large unsigned long!"
#else
/*  8 */
/**	First bit of a dk3_um_t.
*/
#define	DK3_UM_FIRST_BIT	(9223372036854775808UL)
/**	First bit of a dk3_um_t written as double.
*/
#define	DK3_UM_FIRST_DOUBLE	(9223372036854775808.0)
#endif
#else
/*  4 */
#define	DK3_UM_FIRST_BIT	(2147483648UL)
#define	DK3_UM_FIRST_DOUBLE	(2147483648.0)
#endif
#else
/*  2 */
/**	First bit of a dk3_um_t.
*/
#define	DK3_UM_FIRST_BIT	(32768UL)
/**	First bit of a dk3_um_t written as double.
*/
#define	DK3_UM_FIRST_DOUBLE	(32768.0)
#endif
/* - unsigned long */
#endif
#endif



/**	Constant value 2 as dk3_um_t.
*/
static dk3_um_t const dk3ma_um2 =
#if DK3_HAVE_LONG_LONG
  (dk3_um_t)2ULL
#else
  (dk3_um_t)2UL
#endif
;


dk3_um_t
dk3ma_d_to_um_ok(double x, int *ec)
{
  dk3_um_t		back	=	DK3_UM_0;
  dk3_um_t		testu;
  double		testd;
  $? "+ dk3ma_d_to_um_ok %lg", x
  if (0.0 <= x) {
#if DK3_HAVE_LONG_DOUBLE
    if ((long double)DK3_UM_MAX >= (long double)x)
#else
    if ((double)DK3_UM_MAX >= x)
#endif
    {
      testd = DK3_UM_FIRST_DOUBLE;
      testu = DK3_UM_FIRST_BIT;
      for (i = 0; i < (8 * DK3_SIZEOF_UM); i++) {
        if (x >= testd) {
	  x = x - testd;
	  back = back + testu;
	}
        testd = testd / 2.0;
	testu = testu / dk3ma_um2;
      }
    }
    else
    {
      back = DK3_UM_MAX
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    }
  } else {
    if (NULL != ec) { *ec = DK3_ERROR_MATH_OUT_OF_RANGE; }
  }
  $? "- dk3ma_d_to_um_ok %ju", back
  return back;
}



dk3_im_t
dk3ma_d_to_im_ok(double x, int *ec)
{
  dk3_im_t	back	= DK3_IM_0;
  dk3_um_t	tmp;
  int		mec	= 0;

  if (x >= 0.0) {
    tmp = dk3ma_d_to_um_ok(x, &mec);
    if (0 == mec) {
      if ((dk3_um_t)DK3_IM_MAX >= tmp) {
        back = (dk3_im_t)tmp;
      } else {
        back = DK3_IM_MAX;
        if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
      }
    } else {
      if (NULL != ec) { *ec = mec; }
    }
  } else {
    if ((double)DK3_IM_MIN > x) {
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
      back = DK3_IM_MIN;
    } else {
      if ((double)(-DK3_IM_MAX) > x) {
        back = DK3_IM_MIN;
      } else {
        tmp = dk3ma_d_to_um_ok((0.0 - x), &mec);
	if (0 == mec) {
	  if ((dk3_um_t)DK3_IM_MAX >= tmp) {
	    back = DK3_IM_0 - (dk3_im_t)tmp;
	  } else {
	    back = DK3_IM_MIN;
	    if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
	  }
	} else {
	  if (NULL != ec) { *ec = mec; }
	}
      }
    }
  }
}



#if DK3_HAVE_INTMAX_T

uintmax_t
dk3ma_d_to_uintmax_t_ok(double x, int *ec)
{
  return (dk3ma_d_to_um_ok(x, ec));
}

intmax_t
dk3ma_d_to_intmax_t_ok(double x, int *ec)
{
  return (dk3ma_d_to_im_ok(x, ec));
}

#endif



#if DK3_HAVE_LONG_LONG

unsigned long long
dk3ma_d_to_ull_ok(double x, int *ec)
{
#if (!(DK3_HAVE_INTMAX_T))
  return (dk3ma_d_to_um_ok(x, ec));
#else
  dk3_um_t		tmp;
  unsigned long long	back	=	0ULL;
  int			mec	=	0;
  if (0.0 <= x) {
    tmp = dk3ma_d_to_um_ok(x, &mec);
    if (0 == mec) {
#if DK3_SIZEOF_LONG_LONG >= DK3_SIZEOF_UM
      back = (unsigned long long)tmp;
#else
      if ((dk3_um_t)DK3_ULL_MAX >= tmp) {
        back = (unsigned long long)tmp;
      } else {
        back = DK3_ULL_MAX;
	if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
      }
#endif
    } else {
      if (NULL != ec) { *ec = mec; }
    }
  } else {
    if (NULL != ec) { *ec = DK3_ERROR_MATH_OUT_OF_RANGE; }
  }
  return back;
#endif
}



long long
dk3ma_d_to_ll_ok(double x, int *ec)
{
#if (!(DK3_HAVE_INTMAX_T))
  return (dk3ma_d_to_im_ok(x, ec));
#else
  dk3_im_t	tmp;
  long long	back	=	0LL;
  int		mec	=	0;

  tmp = dk3ma_d_to_im_ok(x, &mec);
  if (0 == mec) {
#if DK3_SIZEOF_LONG_LONG >= DK3_SIZEOF_UM
    back = (long long)tmp;
#else
    if ((dk3_im_t)DK3_LL_MIN <= tmp) {
      if ((dk3_im_t)DK3_LL_MAX >= tmp) {
        back = (long long)tmp;
      } else {
        back = DK3_LL_MAX;
	if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
      }
    } else {
      back = DK3_LL_MIN;
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    }
#endif
  } else {
    if (NULL != ec) { *ec = mec; }
  }
#endif
}

#endif



unsigned long
dk3ma_d_to_ul_ok(double x, int *ec)
{
#if (!((DK3_HAVE_INTMAX_T) || (DK3_HAVE_LONG_LONG)))
  return (dk3ma_d_to_um_ok(x, ec));
#else
  dk3_um_t		tmp;
  unsigned long		back	=	0UL;
  int			mec	=	0;

  tmp = dk3ma_d_to_um_ok(x, &mec);
  if (0 == mec) {
#if DK3_SIZEOF_LONG >= DK3_SIZEOF_UM
    back = (unsigned long)tmp;
#else
    if ((dk3_um_t)DK3_UL_MAX >= tmp) {
      back = (unsigned long)tmp;
    } else {
      back = DK3_UL_MAX;
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    }
#endif
  } else {
    if (NULL != ec) { *ec = mec; }
  }
  return back;
#endif
}



long
dk3ma_d_to_l_ok(double x, int *ec)
{
#if (!((DK3_HAVE_INTMAX_T) || (DK3_HAVE_LONG_LONG)))
  return (dk3ma_d_to_im_ok(x, ec));
#else
  dk3_im_t	tmp;
  long		back	=	0L;
  int		mec	=	0;
  tmp = dk3ma_d_to_im_ok(x, &mec);
  if (0 == mec) {
#if DK3_SIZEOF_LONG >= DK3_SIZEOF_UM
    back = (long)tmp;
#else
    if ((dk3_im_t)DK3_L_MIN <= tmp) {
      if ((dk3_im_t)DK3_L_MAX >= tmp) {
        back = (dk3_im_t)tmp;
      } else {
        back = DK3_L_MAX;
	if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
      }
    } else {
      back = DK3_L_MIN;
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    }
#endif
  } else {
    if (NULL != ec) { *ec = mec; }
  }
  return back;
#endif
}



size_t
dk3ma_d_to_sz_ok(double v, int *ec)
{
  dk3_um_t	tmp;
  size_t	back	=	0;
  int		mec	=	0;
  
  tmp = dk3ma_d_to_um_ok(v, &mec);
  if (0 == mec) {
#if DK3_SIZEOF_SIZE_T >= DK3_SIZEOF_UM
    back = (size_t)tmp;
#else
    if ((dk3_um_t)DK3_SIZE_T_MAX >= tmp) {
      back = (size_t)tmp;
    } else {
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    }
#endif
  } else {
    if (NULL != ec) { *ec = mec; }
  }
  return back;
}



#endif
/* if 1, formerly if DK3_HAVE_COMPILER_CONVERSIONS */