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%% options
copyright owner = Dirk Krause
copyright year = 2014-xxxx
SPDX-License-Identifier: BSD-3-Clause
%% header
/** @file dk3maui.h Mathematical operations on unsigned int.
*/
#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
/** Addition.
@param a Left operand.
@param b Right operand.
@param ec Pointer to error code variable, may be NULL.
The variable may be set to DK3_ERROR_MATH_OVERFLOW when returning.
@return Summary of a and b.
*/
unsigned
dk3ma_ui_add_ok(unsigned a, unsigned b, int *ec);
/** Substraction.
@param a Left operand.
@param b Right operand.
@param ec Pointer to error code variable, may be NULL.
The variable may be set to DK3_ERROR_MATH_OVERFLOW when returning.
@return Difference of a and b.
*/
unsigned
dk3ma_ui_sub_ok(unsigned a, unsigned b, int *ec);
/** Multiplication.
@param a Left operand.
@param b Right operand.
@param ec Pointer to error code variable, may be NULL.
The variable may be set to DK3_ERROR_MATH_OVERFLOW when returning.
@return Product of a and b.
*/
unsigned
dk3ma_ui_mul_ok(unsigned a, unsigned b, int *ec);
/** Division.
@param a Left operand (nominator).
@param b Right operand (denominator).
@param ec Pointer to error code variable, may be NULL.
The variable may be set to DK3_ERROR_MATH_OVERFLOW or
DK3_ERROR_MATH_DIVZERO when returning.
@return Fraction of a and b.
*/
unsigned
dk3ma_ui_div_ok(unsigned a, unsigned b, int *ec);
/** Greatest common divisor.
@param a Left operand.
@param b Right operand.
The variable may be set to DK3_ERROR_MATH_OVERFLOW when returning.
@return Greatest common divisor of a and b.
*/
unsigned
dk3ma_ui_gcd(unsigned a, unsigned b);
#ifdef __cplusplus
}
#endif
%% module
#include "dk3ma.h"
$!trace-include
unsigned
dk3ma_ui_add_ok(unsigned a, unsigned b, int *ec)
{
if (NULL != ec) {
if ((DK3_U_MAX - a) < b) { *ec = DK3_ERROR_MATH_OVERFLOW; }
}
return (a + b);
}
unsigned
dk3ma_ui_sub_ok(unsigned a, unsigned b, int *ec)
{
if (NULL != ec) { if (b > a) { *ec = DK3_ERROR_MATH_OVERFLOW; } }
return (a - b);
}
unsigned
dk3ma_ui_mul_ok(unsigned a, unsigned b, int *ec)
{
if (NULL != ec) {
if (0U != a) {
if ((DK3_U_MAX / a) < b) { *ec = DK3_ERROR_MATH_OVERFLOW; }
}
}
return (a * b);
}
unsigned
dk3ma_ui_div_ok(unsigned a, unsigned b, int *ec)
{
unsigned back = (unsigned)0;
if (0U != b) {
back = a / b;
} else {
if (NULL != ec) { *ec = DK3_ERROR_MATH_DIVZERO; }
back = DK3_U_MAX;
}
return back;
}
unsigned
dk3ma_ui_gcd(unsigned a, unsigned b)
{
unsigned h;
while (0U < b) {
h = a % b;
a = b;
b = h;
}
if (0U == a) { a = 1U; }
return a;
}
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