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|
%% options
copyright owner = Dirk Krause
copyright year = 2015-xxxx
license = bsd
%% header
/** @file
Arithmetic operations on 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
/** Absolute value.
@param a Operand.
@param erp Error report, may be NULL.
@return Result on success, LLONG_MAX if a is LLONG_MIN
(overflow is reported in erp).
Error codes: DK4_E_OVERFLOW.
*/
long long
dk4ma_ll_abs(long long a, dk4_er_t *erp);
/** 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.
*/
long long
dk4ma_ll_add(long long a, 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.
*/
long long
dk4ma_ll_sub(long long a, 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.
*/
long long
dk4ma_ll_mul(long long a, 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,
LLONG_MIN, LLONG_MAX, or 0 on division by zero or overflow
(see the ec component of erp).
Error codes: DK4_E_OVERFLOW, DK4_E_DIVZERO.
*/
long long
dk4ma_ll_div(long long a, 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 "dk4maall.h"
#if DK4_HAVE_LONG_LONG
long long
dk4ma_ll_abs(long long a, dk4_er_t *erp)
{
if (LLONG_MIN == a) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
return ((0LL <= a) ? a : ((LLONG_MIN == a) ? LLONG_MAX : (0LL - a)));
}
long long
dk4ma_ll_add(long long a, long long b, dk4_er_t *erp)
{
if ((0LL < a) && (0LL < b)) {
if ((LLONG_MAX - a) < b) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
} else {
if ((0LL > a) && (0LL > b)) {
if (LLONG_MIN == a) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
} else {
if ((LLONG_MIN - a) > b) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
}
}
}
return (a + b);
}
long long
dk4ma_ll_sub(long long a, long long b, dk4_er_t *erp)
{
if ((0LL < a) && (0LL > b)) {
if ((LLONG_MAX + b) < a) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
} else {
if ((0LL > a) && (0LL < b)) {
if ((LLONG_MIN + b) > a) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
}
}
return (a - b);
}
long long
dk4ma_ll_mul(long long a, long long b, dk4_er_t *erp)
{
if ((0LL != a) && (0LL != b)) {
if (LLONG_MIN == a) {
if (1LL != b) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
} else {
if (LLONG_MIN == b) {
if (1LL != a) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
} else {
if (0LL < a) {
if (0LL < b) {
if ((LLONG_MAX / a) < b) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
} else {
if ((LLONG_MIN / a) > b) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
}
} else {
if (0LL < b) {
if ((LLONG_MIN / b) > a) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
} else {
if ((LLONG_MAX / (0LL - a)) < (0LL - b)) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
}
}
}
}
}
return (a * b);
}
long long
dk4ma_ll_div(long long a, long long b, dk4_er_t *erp)
{
long long back = 0;
if (0LL != b) {
if ((LLONG_MIN == a) && (-1LL == b)) {
back = LLONG_MAX;
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
} else {
back = a / b;
}
} else {
if (0LL < a) {
back = LLONG_MAX;
} else {
if (0LL > a) {
back = LLONG_MIN;
}
}
dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO);
}
return back;
}
#endif
|
