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%%	options

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


%%	header

/**	@file	dk4maau16.h	Operations on uint16_t data.
*/


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

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

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

#if DK4_HAVE_STDLIB_H
#ifndef	DK4_STDLIB_H_INCLUDED
#include <stdlib.h>
#define	DK4_STDLIB_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_SYS_TYPES_H
#ifndef	DK4_SYS_TYPES_H_INCLUDED
#include <sys/types.h>
#define	DK4_SYS_TYPES_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_STDINT_H
#ifndef	DK4_STDINT_H_INCLUDED
#include <stdint.h>
#define	DK4_STDINT_H_INCLUDED 1
#endif
#endif

#ifdef	__cplusplus
extern "C" {
#endif

/**	Addition of uint16_t.
	@param	a	Left operand.
	@param	b	Right operand.
	@param	erp	Error report, may be NULL.
	@return	Operation result.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if a or b is out of range
	- DK4_E_MATH_OVERFLOW<br>
	  if a mathematical overfow occured.
*/
uint16_t
dk4ma_uint16_t_add(uint16_t a, uint16_t b, dk4_er_t *erp);

/**	Substraction of uint16_t.
	@param	a	Left operand.
	@param	b	Right operand.
	@param	erp	Error report, may be NULL.
	@return	Operation result.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if a or b is out of range
	- DK4_E_MATH_OVERFLOW<br>
	  if a mathematical overfow occured.
*/
uint16_t
dk4ma_uint16_t_sub(uint16_t a, uint16_t b, dk4_er_t *erp);

/**	Multiplication of uint16_t.
	@param	a	Left operand.
	@param	b	Right operand.
	@param	erp	Error report, may be NULL.
	@return	Operation result.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if a or b is out of range
	- DK4_E_MATH_OVERFLOW<br>
	  if a mathematical overfow occured.
*/
uint16_t
dk4ma_uint16_t_mul(uint16_t a, uint16_t b, dk4_er_t *erp);

/**	Division of uint16_t.
	@param	a	Left operand.
	@param	b	Right operand.
	@param	erp	Error report, may be NULL.
	@return	Operation result.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if a or b is out of range
	- DK4_E_MATH_OVERFLOW<br>
	  if a mathematical overfow occured,
	- DK4_E_MATH_DIVZERO<br>
	  if b is 0.
*/
uint16_t
dk4ma_uint16_t_div(uint16_t a, uint16_t b, dk4_er_t *erp);

#ifdef	__cplusplus
}
#endif


%%	module

#include "dk4maau16.h"



$!trace-include



uint16_t
dk4ma_uint16_t_add(uint16_t a, uint16_t b, dk4_er_t *erp)
{
  if (DK4_U16_MAX < a) {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
    goto finished;
  }
  if (DK4_U16_MAX < b) {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
    goto finished;
  }
  if ((DK4_U16_MAX - a) < b) {
    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
  }
finished:
  return (a + b);
}



uint16_t
dk4ma_uint16_t_sub(uint16_t a, uint16_t b, dk4_er_t *erp)
{
  if (DK4_U16_MAX < a) {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
    goto finished;
  }
  if (DK4_U16_MAX < b) {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
    goto finished;
  }
  if (b > a) {
    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
  }
finished:
  return (a - b);
}



uint16_t
dk4ma_uint16_t_mul(uint16_t a, uint16_t b, dk4_er_t *erp)
{
  if (DK4_U16_MAX < a) {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
    goto finished;
  }
  if (DK4_U16_MAX < b) {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
    goto finished;
  }
  if ((0 < a) && (0 < b)) {
    if ((DK4_U16_MAX / a) < b) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
  }
finished:
  return (a * b);
}



uint16_t
dk4ma_uint16_t_div(uint16_t a, uint16_t b, dk4_er_t *erp)
{
  uint16_t	back	= 0;
  if (DK4_U16_MAX < a) {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
    goto finished;
  }
  if (DK4_U16_MAX < b) {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
    goto finished;
  }
finished:
  if (0 != b) {
    back = a / b;
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO);
  }
  return back;
}