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234 lines
8.4 KiB
C
234 lines
8.4 KiB
C
/*
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* Harbour Project source code:
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* Harbour floating point math macros
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*
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* Copyright 2009 Przemyslaw Czerpak <druzus / at / priv.onet.pl>
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* www - http://harbour-project.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING.txt. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
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*
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* As a special exception, the Harbour Project gives permission for
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* additional uses of the text contained in its release of Harbour.
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*
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* The exception is that, if you link the Harbour libraries with other
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* files to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the Harbour library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the Harbour
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* Project under the name Harbour. If you copy code from other
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* Harbour Project or Free Software Foundation releases into a copy of
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* Harbour, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for Harbour, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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*
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*/
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#ifndef HB_FLOAT_H_
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#define HB_FLOAT_H_
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#ifndef _GNU_SOURCE
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# define _GNU_SOURCE
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#endif
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#ifndef __EXTENSIONS__
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# define __EXTENSIONS__
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#endif
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/* workaround for some missing C99 math macros in SunOS GCC
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* used in C++ mode
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*/
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#if ! defined( __C99FEATURES__ ) && defined( __GNUC__ ) && defined( __sun__ )
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# define __C99FEATURES__
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#endif
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#if defined( __TINYC__ )
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#define __NO_ISOCEXT
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#endif
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#include "hbapi.h"
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#if defined( __DJGPP__ )
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# include <libm/math.h>
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/* _LIB_VERSION_TYPE _LIB_VERSION = _XOPEN_; */
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#else
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# include <math.h>
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# if defined( __BORLANDC__ ) || defined( __WATCOMC__ ) || defined( _MSC_VER ) || defined( HB_OS_MINIX )
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# include <float.h>
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# elif defined( HB_OS_SUNOS )
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# include <ieeefp.h> /* for finite() */
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# endif
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#endif
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#if defined( HB_LONG_DOUBLE_OFF ) && ! defined( __NO_LONGDOUBLE__ )
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# define __NO_LONGDOUBLE__
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#endif
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#define _HB_NUM_NAN 1
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#define _HB_NUM_PINF 2
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#define _HB_NUM_NINF 4
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#if defined( __BORLANDC__ ) && 0
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/* do not use Borland C _fpclass[l]() function.
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* it switches internal logic used for floating point calculation
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* in this compiler reducing the precision to 'float' type.
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*/
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# ifdef __NO_LONGDOUBLE__
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# define hb_fpclassify( d ) _fpclass( d )
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# else
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# define hb_fpclassify( d ) ( sizeof( d ) == sizeof( double ) ? \
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_fpclass( d ) : _fpclassl( d ) )
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# endif
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#endif
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/* on some platforms signbit() needs _GNU_SOURCE defined.
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* If it's not available on given platform then it can be replaced by
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* 'value < 0' but in such case -0.0 will be shown as 0.0
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*/
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#if defined( _ISOC99_SOURCE ) || defined( _STDC_C99 ) || defined( signbit )
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# define hb_signbit( d ) signbit( d )
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#elif defined( __BORLANDC__ ) && defined( hb_fpclassify )
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# define hb_signbit( d ) ( ( hb_fpclassify( d ) & ( _FPCLASS_NINF | _FPCLASS_NZ ) ) != 0 )
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#elif 0 /* TODO: add other C compilers here (check their version number) */
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#else
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# define hb_signbit( d ) ( d < 0 )
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#endif
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#if defined( _ISOC99_SOURCE ) || defined( _STDC_C99 ) || \
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( defined( isfinite ) && defined( isnan ) && defined( isinf ) )
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/* use C99 macros */
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# define hb_isfinite( d ) isfinite( d )
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# define HB_NUMTYPE( v, d ) do { \
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v = ( isfinite( d ) ? 0 : \
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( isnan( d ) ? _HB_NUM_NAN : \
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( isinf( d ) < 0 ? _HB_NUM_NINF : \
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_HB_NUM_PINF ) ) ); \
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} while( 0 )
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#elif ( defined( __GNUC__ ) || \
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defined( __SUNPRO_C ) || defined( __SUNPRO_CC ) ) && \
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( defined( _BSD_SOURCE ) || defined( _SVID_SOURCE ) || \
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defined( _XOPEN_SOURCE ) )
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/* use BSD floating point functions */
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# define hb_isfinite( d ) finite( d )
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# define HB_NUMTYPE( v, d ) do { \
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v = ( finite( d ) ? 0 : \
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( isnan( d ) ? _HB_NUM_NAN : \
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( isinf( d ) < 0 ? _HB_NUM_NINF : \
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_HB_NUM_PINF ) ) ); \
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} while( 0 )
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# if ! defined( __NO_LONGDOUBLE__ ) && ! defined( HB_OS_SUNOS )
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# define HB_NUMTYPEL( v, d ) do { \
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v = ( finitel( d ) ? 0 : \
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( isnanl( d ) ? _HB_NUM_NAN : \
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( isinfl( d ) < 0 ? _HB_NUM_NINF : \
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_HB_NUM_PINF ) ) ); \
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} while( 0 )
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# endif
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#elif defined( __BORLANDC__ )
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# define hb_isfinite( d ) _finite( d )
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# if defined( hb_fpclassify )
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# define HB_NUMTYPE( v, d ) do { \
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int t = hb_fpclassify( d ); \
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v = ( ( t & ( _FPCLASS_UNSUP | _FPCLASS_SNAN | _FPCLASS_QNAN ) ) ? _HB_NUM_NAN : \
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( ( t & _FPCLASS_NINF ) ? _HB_NUM_NINF : \
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( ( t & _FPCLASS_PINF ) ? _HB_NUM_PINF : 0 ) ) ); \
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} while( 0 )
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# else
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# define HB_NUMTYPE( v, d ) do { \
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v = ( _finite( d ) ? 0 : \
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( _isnan( d ) ? _HB_NUM_NAN : \
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_HB_NUM_PINF ) ); \
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} while( 0 )
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# if ! defined( __NO_LONGDOUBLE__ )
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# define HB_NUMTYPEL( v, d ) do { \
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v = ( _finitel( d ) ? 0 : \
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( _isnanl( d ) ? _HB_NUM_NAN : \
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_HB_NUM_PINF ) ); \
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} while( 0 )
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# endif
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# endif
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#elif 0 /* TODO: add other C compilers here (check their version number) */
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#else
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# if defined( __RSXNT__ ) || defined( __EMX__ ) || \
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defined( __XCC__ ) || defined( __POCC__ ) || \
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defined( __MINGW32__ ) || defined( HB_OS_HPUX ) || defined( HB_OS_MINIX )
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# define hb_isfinite( d ) isfinite( d )
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# elif defined( _MSC_VER )
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# define hb_isfinite( d ) _finite( ( double ) d )
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# elif defined( __BORLANDC__ ) || defined( __WATCOMC__ )
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# define hb_isfinite( d ) _finite( d )
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# elif defined( __GNUC__ ) || defined( __DJGPP__ ) || defined( __LCC__ ) || \
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defined( HB_OS_SUNOS )
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# define hb_isfinite( d ) finite( d )
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# endif
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# if defined( hb_isfinite )
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# define HB_NUMTYPE( v, d ) do { \
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v = hb_isfinite( d ) ? 0 : _HB_NUM_NAN ; \
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} while( 0 )
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# else
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# define hb_isfinite( d ) HB_TRUE
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# define HB_NUMTYPE( v, d ) do { \
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int iTODO; \
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v = hb_isfinite( d ) ? 0 : _HB_NUM_NAN ; \
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} while( 0 )
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# endif
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#endif
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#if ! defined( HB_NUMTYPEL )
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# define HB_NUMTYPEL( v, d ) HB_NUMTYPE( v, d )
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#endif
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/* NOTE: Workaround for Pellec C 5.00 not having an 'inf' (HUGE_VAL)
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in '-Tarm-coff' mode. [vszakats] */
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#if defined( __POCC__ ) && defined( HB_OS_WIN_CE )
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#undef HUGE_VAL
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#define HUGE_VAL ( 1.0 / ( 1.0, 0.0 ) )
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#endif
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#endif /* HB_FLOAT_H_ */
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