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|
%% options
copyright owner = Dirk Krause
copyright year = 2016-xxxx
license = bsd
%% header
/** @file dk4fpe.h Floating point exceptions.
Note: Including this file disables optimization of
floating point operations by use of compiler pragma directives.
Use only in those modules in which you want to check for
floating point exceptions.
This header file should be the last file included by a module.
*/
/* Pragmas differ on Windows and Unix/Linux to prevent optimization
of floating point operations.
At least one compiler bails out with error message for unknown
pragma directives.
*/
#ifndef _WIN32
/* +++ !Windows */
#ifdef __SUNPRO_C
/* +++ !Windows, SUN workshop compiler */
#if __SUNPRO_C > 0x570
#pragma STDC FENV_ACCESS on
#endif
/* --- !Windows, SUN workshop compiler */
#else
/* +++ !Windows, ! SUN workshop compiler */
#pragma STDC FENV_ACCESS on
/* --- !Windows, ! SUN workshop compiler */
#endif
/* --- !Windows */
#endif
#ifndef DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif
#ifndef DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif
#if DK4_HAVE_MATH_H
#ifndef MATH_H_INCLUDED
#ifdef _WIN32
#define _USE_MATH_DEFINES 1
#endif
#include <math.h>
#define MATH_H_INCLUDED 1
#endif
#endif
#if DK4_HAVE_FLOAT_H
#ifndef FLOAT_H_INCLUDED
#include <float.h>
#define FLOAT_H_INCLUDED 1
#endif
#endif
#ifndef _WIN32
#if DK4_HAVE_FENV_H
#ifndef FENV_H_INCLUDED
#include <fenv.h>
#define FENV_H_INCLUDED 1
#endif
#endif
#endif
#ifndef DK4ERROR_H_INCLUDED
#include "dk4error.h"
#endif
#ifdef _WIN32
/* +++ Windows */
#pragma fenv_access (on)
/* --- Windows */
#endif
#ifdef _WIN32
/** Floating point exception set.
*/
typedef unsigned int dk4_fpe_t;
#else
/** Floating point exception set.
*/
typedef int dk4_fpe_t;
#endif
#ifdef __cplusplus
extern "C" {
#endif
/** Check floating point exception set for errors occured.
@param fpe Floating point exception set.
@param erp Error report, may be NULL.
@return 1 if error exceptions are set, 0 if there is no
error condition.
Error codes:
* DK4_E_MATH_INVALID<br>
if an invalid operation was performed,
* DK4_E_MATH_DIVZERO<br>
if a division by zero (or small denominator) occured,
* DK4_E_MATH_OVERFLOW<br>
if a range overflow occured (result too large),
* DK4_E_MATH_UNDERFLOW<br>
if a range underflow occured (result too small).
*/
int
dk4fpe_check_error(dk4_fpe_t fpe, dk4_er_t *erp);
/** Clear floating point exceptions.
@param erp Error report, may be NULL.
@return 1 on success, 0 on error.
Error codes:
* DK4_E_NOT_SUPPORTED<br>
if no functions for floating point exceptions are available,
* DK4_E_SYSTEM<br>
if the feclearexcept() function indicated an error.
*/
int
dk4fpe_clear(dk4_er_t *erp);
/** Obtain floating point exceptions.
@param dptr Address of destination variable to store result.
@param erp Error report, may be NULL.
@return 1 on success, 0 on error.
Error codes:
* DK4_E_INVALID_ARGUMENTS<br>
if dptr is NULL,
* DK4_E_NOT_SUPPORTED<br>
if no functions for floating point exceptions are available.
*/
int
dk4fpe_get(dk4_fpe_t *dptr, dk4_er_t *erp);
/** Obtain and clear floating point exceptions.
@param dptr Address of destination variable to store result.
@param erp Error report, may be NULL.
@return 1 on success, 0 on error.
Error codes:
* DK4_E_INVALID_ARGUMENTS<br>
if dptr is NULL,
* DK4_E_NOT_SUPPORTED<br>
if no functions for floating point exceptions are available,
* DK4_E_SYSTEM<br>
if the feclearexcept() function indicated an error.
*/
int
dk4fpe_get_clear(dk4_fpe_t *dptr, dk4_er_t *erp);
/** Check a double value whether or not it is a finite number
(not +/- INF, not NaN).
@param d Value to check.
@return 1 on success, 0 on error.
*/
int
dk4fpe_is_finite(double d) ;
/** Check a double value whether or not it is a normalized number
(not +/- INF, not NaN, not denormalized).
@param d Value to check.
@return 1 on success, 0 on error.
*/
int
dk4fpe_is_normal(double d);
#ifdef __cplusplus
}
#endif
%% module
#include "dk4fpe.h"
#ifdef _WIN32
/** Exception set for errors.
*/
static const unsigned int dk4fpe_errors =
_SW_ZERODIVIDE | _SW_INVALID | _SW_OVERFLOW | _SW_UNDERFLOW;
#else
/** Exception set for errors.
*/
static const int dk4fpe_errors =
FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW;
#endif
int
dk4fpe_check_error(dk4_fpe_t fpe, dk4_er_t *erp)
{
int back = 0;
if ((dk4_fpe_t)0 != (dk4fpe_errors & fpe)) {
back = 1;
#ifdef _WIN32
if ((dk4_fpe_t)0 != (_SW_INVALID & fpe))
#else
if ((dk4_fpe_t)0 != (FE_INVALID & fpe))
#endif
{
dk4error_set_simple_error_code(erp, DK4_E_MATH_INVALID);
}
else
{
#ifdef _WIN32
if ((dk4_fpe_t)0 != (_SW_ZERODIVIDE & fpe))
#else
if ((dk4_fpe_t)0 != (FE_DIVBYZERO & fpe))
#endif
{
dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO);
}
else
{
#ifdef _WIN32
if ((dk4_fpe_t)0 != (_SW_OVERFLOW & fpe))
#else
if ((dk4_fpe_t)0 != (FE_OVERFLOW & fpe))
#endif
{
dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
}
else
{
#ifdef _WIN32
if ((dk4_fpe_t)0 != (_SW_UNDERFLOW & fpe))
#else
if ((dk4_fpe_t)0 != (FE_UNDERFLOW & fpe))
#endif
{
dk4error_set_simple_error_code(erp, DK4_E_MATH_UNDERFLOW);
}
}
}
}
}
return back;
}
int
dk4fpe_clear(dk4_er_t *erp)
{
#ifdef _WIN32
_clearfp();
return 1;
#else
#if DK4_HAVE_FETESTEXCEPT
int back = 0;
if (0 == feclearexcept(FE_ALL_EXCEPT)) {
back = 1;
} else {
dk4error_set_simple_error_code(erp, DK4_E_SYSTEM);
}
return back;
#else
dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
return 0;
#endif
#endif
}
int
dk4fpe_get(dk4_fpe_t *dptr, dk4_er_t *erp)
{
int back = 0;
if (NULL != dptr) {
#ifdef _WIN32
*dptr = (dk4_fpe_t)_statusfp();
back = 1;
#else
#if DK4_HAVE_FETESTEXCEPT
*dptr = (dk4_fpe_t)fetestexcept(FE_ALL_EXCEPT);
back = 1;
#else
dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
#endif
#endif
} else {
dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
}
return back;
}
int
dk4fpe_get_clear(dk4_fpe_t *dptr, dk4_er_t *erp)
{
int back = 0;
if (NULL != dptr) {
#ifdef _WIN32
*dptr = _clearfp();
back = 1;
#else
#if DK4_HAVE_FETESTEXCEPT
*dptr = (dk4_fpe_t)fetestexcept(FE_ALL_EXCEPT);
if (0 == feclearexcept(FE_ALL_EXCEPT)) {
back = 1;
} else {
dk4error_set_simple_error_code(erp, DK4_E_SYSTEM);
}
#else
dk4error_set_simple_error_code(erp, DK4_E_NOT_SUPPORTED);
#endif
#endif
} else {
dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
}
return back;
}
int
dk4fpe_is_finite(double d)
{
int back = 0;
#ifdef _WIN32
back = ((0 != _finite(d)) ? 1 : 0);
#else
back = ((0 != isfinite(d)) ? 1 : 0);
#endif
return back;
}
int
dk4fpe_is_normal(double d)
{
int back = 0;
#ifdef _WIN32
switch (_fpclass(d)) {
case _FPCLASS_NN : case _FPCLASS_NZ :
case _FPCLASS_PZ : case _FPCLASS_PN :
{
back = 1;
} break;
}
#else
back = ((0 != isnormal(d)) ? 1 : 0);
#endif
return back;
}
|