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/*
Copyright (C) 2002 John W. Eaton
This file is part of Octave.
Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
Octave is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING. If not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <float.h>
#include <math.h>
#if defined (HAVE_FLOATINGPOINT_H)
#include <floatingpoint.h>
#endif
#if defined (HAVE_IEEEFP_H)
#include <ieeefp.h>
#endif
#if defined (HAVE_NAN_H)
#if defined (SCO)
#define _IEEE 1
#endif
#include <nan.h>
#if defined (SCO)
#undef _IEEE
#endif
#endif
#include "lo-ieee.h"
#if defined (_AIX) && defined (__GNUG__)
#undef finite
#define finite(x) ((x) < DBL_MAX && (x) > -DBL_MAX)
#endif
/* Octave's idea of infinity. */
double octave_Inf;
/* Octave's idea of a missing value. */
double octave_NA;
/* Octave's idea of not a number. */
double octave_NaN;
int lo_ieee_hw;
int lo_ieee_lw;
#if defined (SCO)
int
isnan (double x)
{
return (IsNANorINF (x) && NaN (x) && ! IsINF (x)) ? 1 : 0;
}
int
isinf (double x)
{
return (IsNANorINF (x) && IsINF (x)) ? 1 : 0;
}
#endif
int
lo_ieee_isnan (double x)
{
#if defined (HAVE_ISNAN)
return isnan (x) ? ! lo_ieee_is_NA (x) : 0;
#else
return 0;
#endif
}
int
lo_ieee_finite (double x)
{
#if defined (HAVE_FINITE)
return finite (x) != 0 && ! lo_ieee_is_NaN_or_NA (x);
#elif defined (HAVE_ISINF)
return (! isinf (x) && ! lo_ieee_is_NaN_or_NA (x));
#else
return ! lo_ieee_is_NaN_or_NA (x);
#endif
}
int
lo_ieee_isinf (double x)
{
#if defined (HAVE_ISINF)
return isinf (x);
#elif defined (HAVE_FINITE)
return (! (finite (x) || lo_ieee_is_NaN_or_NA (x)));
#else
return 0;
#endif
}
int
lo_ieee_is_NA (double x)
{
#if defined HAVE_ISNAN
lo_ieee_double t;
t.value = x;
return (isnan (x) && t.word[lo_ieee_lw] == LO_IEEE_NA_LW) ? 1 : 0;
#else
return 0;
#endif
}
int
lo_ieee_is_NaN_or_NA (double x)
{
/* Although NA really is an IEEE NaN value, lo_ieee_isnan pretends
it is not, so we much check both... */
return lo_ieee_isnan (x) || lo_ieee_is_NA (x);
}
double
lo_ieee_inf_value (void)
{
return octave_Inf;
}
double
lo_ieee_na_value (void)
{
return octave_NA;
}
double
lo_ieee_nan_value (void)
{
return octave_NaN;
}
#if ! (defined (signbit) || defined (HAVE_DECL_SIGNBIT)) && defined (HAVE_SIGNBIT)
extern int signbit (double);
#endif
int
lo_ieee_signbit (double x)
{
/* In the following definitions, only check x < 0 explicitly to avoid
a function call when it looks like signbit or copysign are actually
functions. */
#if defined (signbit)
return signbit (x);
#elif defined (HAVE_SIGNBIT)
return (x < 0 || signbit (x));
#elif defined (copysign)
return (copysign (1.0, x) < 0);
#elif defined (HAVE_COPYSIGN)
return (x < 0 || copysign (1.0, x) < 0);
#else
return x < 0;
#endif
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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