%%	options

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


%%	header


/**	@file	dk3madsc.h	Conversion from double to short and
	unsigned short.
*/

#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 value to short.
	@param	x	Double value to convert.
	@param	ec	Pointer to error code variable.
	Set to DK3_ERROR_MATH_OVERFLOW if the absolute value of x is too large.
	@return	Conversion result.
*/
short
dk3ma_d_to_s_ok(double x, int *ec);

/**	Convert double value to unsigned short.
	@param	x	Double value to convert.
	@param	ec	Pointer to error code variable.
	Set to DK3_ERROR_MATH_OVERFLOW if the absolute value of x is too large,
	DK3_ERROR_MATH_OUT_OF_RANGE for negative x.
	@return	Conversion result.
*/
unsigned short
dk3ma_d_to_us_ok(double x, int *ec);

#ifdef __cplusplus
}
#endif



%%	module



#include "dk3ma.h"



$!trace-include



short
dk3ma_d_to_s_ok(double x, int *ec)
{
  short	back	= 0;
  if ((double)DK3_S_MIN <= x) {
    if ((double)DK3_S_MAX >= x) {
      back = (short)x;
    } else {
      back = DK3_S_MAX;
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    }
  } else {
    back = DK3_S_MIN;
    if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
  }
  return back;
}



unsigned short
dk3ma_d_to_us_ok(double x, int *ec)
{
  unsigned short	back	= 0U;
  if (0.0 <= x) {
    if ((double)DK3_US_MAX >= x) {
      back = (unsigned short)x;
    } else {
      back = DK3_US_MAX;
      if (NULL != ec) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    }
  } else {
    if (NULL != ec) { *ec = DK3_ERROR_MATH_OUT_OF_RANGE; }
  }
  return back;
}