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|
%% options
copyright owner = Dirk Krause
copyright year = 2015-xxxx
license = bsd
%% header
/** @file
Arithmetic operations on signed char.
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
/** Absolute value.
@param a Operand.
@param erp Error report, may be NULL.
@return Result on success, SCHAR_MAX if a is SCHAR_MIN
(overflow is reported in erp).
Error codes: DK4_E_OVERFLOW.
*/
signed char
dk4ma_char_abs(signed char 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.
*/
signed char
dk4ma_char_add(signed char a, signed char 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.
*/
signed char
dk4ma_char_sub(signed char a, signed char 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.
*/
signed char
dk4ma_char_mul(signed char a, signed char 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,
SCHAR_MIN, SCHAR_MAX, or 0 on division by zero or overflow
(see the ec component of erp).
Error codes: DK4_E_OVERFLOW, DK4_E_DIVZERO.
*/
signed char
dk4ma_char_div(signed char a, signed char b, dk4_er_t *erp);
#ifdef __cplusplus
}
#endif
%% module
#include "dk4conf.h"
#include "dk4types.h"
#include "dk4error.h"
#include "dk4numco.h"
#include "dk4maac.h"
$!trace-include
signed char
dk4ma_char_abs(signed char a, dk4_er_t *erp)
{
if (SCHAR_MIN == a) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
return (signed char)((0 <= a) ? a : ((SCHAR_MIN == a) ? SCHAR_MAX : (0 - a)));
}
signed char
dk4ma_char_add(signed char a, signed char b, dk4_er_t *erp)
{
if ((0 < a) && (0 < b)) {
if ((SCHAR_MAX - a) < b) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
} else {
if ((0 > a) && (0 > b)) {
if (SCHAR_MIN == a) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
} else {
if ((SCHAR_MIN - a) > b) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
}
}
}
return (signed char)(a + b);
}
signed char
dk4ma_char_sub(signed char a, signed char b, dk4_er_t *erp)
{
if ((0 < a) && (0 > b)) {
if ((SCHAR_MAX + b) < a) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
} else {
if ((0 > a) && (0 < b)) {
if ((SCHAR_MIN + b) > a) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
}
}
return (signed char)(a - b);
}
signed char
dk4ma_char_mul(signed char a, signed char b, dk4_er_t *erp)
{
$? "+ dk4ma_char_mul %d %d", (int)a, (int)b
if ((0 != a) && (0 != b)) {
if (SCHAR_MIN == a) {
if ((signed char)1 != b) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
} else {
if (SCHAR_MIN == b) {
if ((signed char)1 != a) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
} else {
if (0 < a) {
if (0 < b) {
if ((SCHAR_MAX / a) < b) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
} else {
if ((SCHAR_MIN / a) > b) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
}
} else {
if (0 < b) {
if ((SCHAR_MIN / b) > a) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
} else {
if ((SCHAR_MAX / (0 - a)) < (0 - b)) {
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
}
}
}
}
}
$? "- dk4ma_char_mul %d", (int)((signed char)(a * b))
return (signed char)(a * b);
}
signed char
dk4ma_char_div(signed char a, signed char b, dk4_er_t *erp)
{
signed char back = 0;
if (0 != b) {
if ((SCHAR_MIN == a) && (-1 == b)) {
back = SCHAR_MAX;
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
} else {
back = a / b;
}
} else {
if (0 < a) back = SCHAR_MAX;
if (0 > b) back = SCHAR_MIN;
dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO);
}
return back;
}
|
