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%%	options

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



%%	header

/**	@file
	Arithmetic operations on unsigned int.
	
	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

/**	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.
*/
unsigned
dk4ma_uint_add(unsigned a, unsigned 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.
*/
unsigned
dk4ma_uint_sub(unsigned a, unsigned 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.
*/
unsigned
dk4ma_uint_mul(unsigned a, unsigned 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,
        UINT_MAX on division by zero
        (see the ec component of erp).
        
	Error codes: DK4_E_DIVZERO.
*/
unsigned
dk4ma_uint_div(unsigned a, unsigned b, dk4_er_t *erp);

#ifdef __cplusplus
}
#endif


%%	module

#include "dk4conf.h"
#include "dk4types.h"
#include "dk4error.h"
#include "dk4numco.h"
#include "dk4maaui.h"


unsigned
dk4ma_uint_add(unsigned a, unsigned b, dk4_er_t *erp)
{
  if ((UINT_MAX - a) < b) {
    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
  }
  return (unsigned)(a + b);
}



unsigned
dk4ma_uint_sub(unsigned a, unsigned b, dk4_er_t *erp)
{
  if (b > a) {
    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
  }
  return (unsigned)(a - b);
}



unsigned
dk4ma_uint_mul(unsigned a, unsigned b, dk4_er_t *erp)
{
  if (0U < a) {
    if ((UINT_MAX / a) < b) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
  }
  return (unsigned)(a * b);
}



unsigned
dk4ma_uint_div(unsigned a, unsigned b, dk4_er_t *erp)
{
  if (0U < b) {
    return (unsigned)(a / b);
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO);
    return (unsigned)(UINT_MAX);
  }
}