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%% options
copyright owner = Dirk Krause
copyright year = 2015-xxxx
SPDX-License-Identifier: BSD-3-Clause
%% header
/** @file
Arithmetic operations on unsigned long.
CRT on Windows: Optional.
*/
#ifndef DK4CONF_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4conf.h"
#else
#include <dktools-4/dk4conf.h>
#endif
#endif
#ifndef DK4TYPES_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4types.h"
#else
#include <dktools-4/dk4types.h>
#endif
#endif
#ifndef DK4ERROR_H_INCLUDED
#if DK4_BUILDING_DKTOOLS4
#include "dk4error.h"
#else
#include <dktools-4/dk4error.h>
#endif
#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 long
dk4ma_ulong_add(unsigned long a, unsigned 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.
*/
unsigned long
dk4ma_ulong_sub(unsigned long a, unsigned 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.
*/
unsigned long
dk4ma_ulong_mul(unsigned long a, unsigned 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,
ULONG_MAX on division by zero
(see the ec component of erp).
Error codes: DK4_E_MATH_DIVZERO.
*/
unsigned long
dk4ma_ulong_div(unsigned long a, unsigned long b, dk4_er_t *erp);
/** Convert dk4_um_t value to unsigned long.
@param u Value to convert.
@param erp Error report, may be NULL.
@return Conversion result.
Error codes: DK4_E_MATH_OVERFLOW.
*/
unsigned long
dk4ma_ulong_from(dk4_um_t u, dk4_er_t *erp);
/** Convert double to signed char.
@param d Value to convert.
@param erp Error report, may be NULL.
@return Conversion result.
Error codes: DK4_E_OVERFLOW.
*/
unsigned long
dk4ma_ulong_from_double(double d, dk4_er_t *erp);
#ifdef __cplusplus
}
#endif
%% module
#include "dk4conf.h"
#include "dk4types.h"
#include "dk4error.h"
#include "dk4numco.h"
#include "dk4maaul.h"
$!trace-include
unsigned long
dk4ma_ulong_add(unsigned long a, unsigned long b, dk4_er_t *erp)
{
$? "+ dk4ma_ulong_add %lu %lu", a, b
$? ". ULONG_MAX = %lu", ULONG_MAX
$? ". ULONG_MAX - a = %lu", (ULONG_MAX - a)
$? ". b = %lu", b
if ((ULONG_MAX - a) < b) { $? "! overflow"
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
$? "- dk4ma_ulong_add %lu", (a+b)
return (a + b);
}
unsigned long
dk4ma_ulong_sub(unsigned long a, unsigned long b, dk4_er_t *erp)
{
if (b > a) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
return (a - b);
}
unsigned long
dk4ma_ulong_mul(unsigned long a, unsigned long b, dk4_er_t *erp)
{
if (0UL < a) {
if ((ULONG_MAX / a) < b) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
}
return (a * b);
}
unsigned long
dk4ma_ulong_div(unsigned long a, unsigned long b, dk4_er_t *erp)
{
if (0UL < b) {
return (a / b);
} else {
dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO);
return (unsigned long)(ULONG_MAX);
}
}
unsigned long
dk4ma_ulong_from(dk4_um_t u, dk4_er_t *erp)
{
if ((dk4_um_t)(ULONG_MAX) < u) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
return ((unsigned long)u);
}
unsigned long
dk4ma_ulong_from_double(double d, dk4_er_t *erp)
{
unsigned long back = 0UL;
if ((double)(ULONG_MAX) < d) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
back = ULONG_MAX;
}
else {
if (0.0 > d) {
dk4error_set_simple_error_code(erp,DK4_E_MATH_OVERFLOW);
}
else {
back = (unsigned long)d;
}
}
return back;
}
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