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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
license		=	bsd


%%	header

/**	@file
	Arithmetic operations on long.
	
	CRT on Windows: Optional.
*/

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

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

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



#ifdef __cplusplus
extern "C" {
#endif

/**	Absolute value.
	@param	a	Operand.
	@param	erp	Error report, may be NULL.
	@return	Result on success, LONG_MAX if a is LONG_MIN
	(overflow is reported in erp).
	
	Error codes: DK4_E_OVERFLOW.
*/
long
dk4ma_long_abs(long a, dk4_er_t *erp);

/**	Addition.
	@param	a	Left operand.
	@param	b	Right operand.
	@param	erp	Error report, may be NULL.
	@return	Result on success, least significant result bits
	on overflow (see ec component of erp).
	
	Error codes: DK4_E_OVERFLOW.
*/
long
dk4ma_long_add(long a, long b, dk4_er_t *erp);

/**	Subtraction.
	@param	a	Left operand.
	@param	b	Right operand.
	@param	erp	Error report, may be NULL.
	@return	Result on success, least significant result bits
	on overflow (see ec component of erp).
	
	Error codes: DK4_E_OVERFLOW.
*/
long
dk4ma_long_sub(long a, long b, dk4_er_t *erp);

/**	Multiplication.
	@param	a	Left factor.
	@param	b	right factor.
	@param	erp	Error report, may be NULL.
	@return	Result on success, least significant
	bits on overflow (see ec component of erp).
	
	Error codes: DK4_E_OVERFLOW.
*/
long
dk4ma_long_mul(long a, long b, dk4_er_t *erp);

/**	Division.
	@param	a	Counter (left operand).
	@param	b	Denominator (right operand).
	@param	erp	Error report, may be NULL.
	@return	Division result on success,
	LONG_MIN, LONG_MAX, or 0 on division by zero or overflow
	(see the ec component of erp).
	
	Error codes: DK4_E_OVERFLOW, DK4_E_DIVZERO.
*/
long
dk4ma_long_div(long a, long b, dk4_er_t *erp);

#ifdef __cplusplus
}
#endif


%%	module

#include "dk4conf.h"
#include "dk4types.h"
#include "dk4error.h"
#include "dk4numco.h"
#include "dk4maal.h"



long
dk4ma_long_abs(long a, dk4_er_t *erp)
{
  if (LONG_MIN == a) {
    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
  }
  return ((0L <= a) ? a : ((LONG_MIN == a) ? LONG_MAX : (0L - a)));
}



long
dk4ma_long_add(long a, long b, dk4_er_t *erp)
{
  if ((0L < a) && (0L < b)) {
    if ((LONG_MAX - a) < b) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
  } else {
    if ((0L > a) && (0L > b)) {
      if (LONG_MIN == a) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      } else {
        if ((LONG_MIN - a) > b) {
	  dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	}
      }
    }
  }
  return (a + b);
}



long
dk4ma_long_sub(long a, long b, dk4_er_t *erp)
{
  if ((0L < a) && (0L > b)) {
    if ((LONG_MAX + b) < a) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
  } else {
    if ((0L > a) && (0L < b)) {
      if ((LONG_MIN + b) > a) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      }
    }
  }
  return (a - b);
}



long
dk4ma_long_mul(long a, long b, dk4_er_t *erp)
{
  if ((0L != a) && (0L != b)) {
    if (LONG_MIN == a) {
      if (1L != b) {
        dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
      }
    } else {
      if (LONG_MIN == b) {
        if (1L != a) {
	  dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	}
      } else {
        if (0L < a) {
	  if (0L < b) {
	    if ((LONG_MAX / a) < b) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  } else {
	    if ((LONG_MIN / a) > b) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  }
	} else {
	  if (0L < b) {
	    if ((LONG_MIN / b) > a) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  } else {
	    if ((LONG_MAX / (0L - a)) < (0L - b)) {
	      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
	    }
	  }
	}
      }
    }
  }
  return (a * b);
}



long
dk4ma_long_div(long a, long b, dk4_er_t *erp)
{
  long		back	=	0;
  if (0L != b) {
    if ((LONG_MIN == a) && (-1L == b)) {
      back = LONG_MAX;
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    } else {
      back = a / b;
    }
  } else {
    if (0L < a) {
      back = LONG_MAX;
    } else {
      if (0L > a) {
        back = LONG_MIN;
      }
    }
    dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO);
  }
  return back;
}