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%%	options

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


%%	header

/**	@file
	Arithmetic operations on size_t.
	
	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 of size_t values.
	@param	a	Left operand.
	@param	b	Right operand.
	@param	erp	Error report, may be NULL.
	@return	Result.
*/
size_t
dk4ma_size_t_add(size_t a, size_t b, dk4_er_t *erp);

/**	Difference of size_t values.
	@param	a	Left operand.
	@param	b	Right operand.
	@param	erp	Error report, may be NULL.
	@return	Result.
*/
size_t
dk4ma_size_t_sub(size_t a, size_t b, dk4_er_t *erp);

/**	Multiplication of size_t values.
	@param	a	Left operand.
	@param	b	Right operand.
	@param	erp	Error report, may be NULL.
	@return	Result.
*/
size_t
dk4ma_size_t_mul(size_t a, size_t b, dk4_er_t *erp);

#ifdef __cplusplus
}
#endif

%%	module

#include "dk4conf.h"
#include "dk4types.h"

#if DK4_HAVE_LIMITS_H
#ifndef LIMITS_H_INCLUDED
#include <limits.h>
#define LIMITS_H_INCLUDED 1
#endif
#endif
#if DK4_HAVE_STDINT_H
#ifndef STDINT_H_INCLUDED
#if defined(__cplusplus) && (!defined(__STDC_LIMIT_MACROS))
#define __STDC_LIMIT_MACROS 1
#endif
#if defined(__cplusplus) && (!defined(__STDC_CONSTANT_MACROS))
#define __STDC_CONSTANT_MACROS 1
#endif
#include <stdint.h>
#define STDINT_H_INCLUDED 1
#endif
#endif

#include "dk4error.h"
#include "dk4maasz.h"
#include "dk4error.h"
#include "dk4numco.h"



size_t
dk4ma_size_t_add(size_t a, size_t b, dk4_er_t *erp)
{
  if ((SIZE_MAX - b) < a) {
    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
  }
  return (a + b);
}



size_t
dk4ma_size_t_sub(size_t a, size_t b, dk4_er_t *erp)
{
  if (b > a) {
    dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
  }
  return (a - b);
}



size_t
dk4ma_size_t_mul(size_t a, size_t b, dk4_er_t *erp)
{
  if ((0 < a) && (0 < b)) {
    if ((SIZE_MAX / a) < b) {
      dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
    }
  }
  return (a * b);
}