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%% options
copyright owner = Dirk Krause
copyright year = 2015-xxxx
license = bsd
%% header
/** @file
Arithmetic operations on unsigned long long.
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
#if DK4_HAVE_LONG_LONG
/** 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 long
dk4ma_ull_add(unsigned long long a, unsigned long 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 long
dk4ma_ull_sub(unsigned long long a, unsigned long 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 long
dk4ma_ull_mul(unsigned long long a, unsigned long 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,
ULLONG_MAX on division by zero
(see the ec component of erp).
Error codes: DK4_E_DIVZERO.
*/
unsigned long long
dk4ma_ull_div(unsigned long long a, unsigned long long b, dk4_er_t *erp);
#endif
#ifdef __cplusplus
}
#endif
%% module
#include "dk4conf.h"
#include "dk4types.h"
#include "dk4error.h"
#include "dk4numco.h"
#include "dk4maalu.h"
$!trace-include
#if DK4_HAVE_LONG_LONG
unsigned long long
dk4ma_ull_add(unsigned long long a, unsigned long long b, dk4_er_t *erp)
{
if ((ULLONG_MAX - a) < b) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
return (unsigned long long)(a + b);
}
unsigned long long
dk4ma_ull_sub(unsigned long long a, unsigned long long b, dk4_er_t *erp)
{
if (b > a) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
return (unsigned long long)(a - b);
}
unsigned long long
dk4ma_ull_mul(unsigned long long a, unsigned long long b, dk4_er_t *erp)
{
if (0ULL < a) {
if ((ULLONG_MAX / a) < b) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
}
return (unsigned long long)(a * b);
}
unsigned long long
dk4ma_ull_div(unsigned long long a, unsigned long long b, dk4_er_t *erp)
{
$? "+ dk4ma_ull_div %llu %llu", a, b
if (0ULL < b) {
$? "- dk4ma_ull_div (normal) %llu", (a / b)
return (unsigned long long)(a / b);
} else {
dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO);
$? "- dk4ma_ull_div (divzero) %llu", ULLONG_MAX
return (unsigned long long)(ULLONG_MAX);
}
}
#endif
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