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/*
Copyright (C) 1996 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <cfloat>
#include <cmath>
#if defined (HAVE_FLOATINGPOINT_H)
#include <floatingpoint.h>
#endif
#if defined (HAVE_NAN_H)
#if defined (SCO)
#define _IEEE 1
#endif
#include <nan.h>
#if defined (SCO)
#undef _IEEE
#endif
#endif
#if defined (HAVE_INFINITY)
extern "C" double infinity ();
#endif
#if defined (HAVE_QUIET_NAN)
extern "C" double quiet_nan (long);
#endif
#include "lo-ieee.h"
// Octave's idea of infinity.
double octave_Inf;
// Octave's idea of not a number.
double octave_NaN;
void
octave_ieee_init (void)
{
#if defined (HAVE_ISINF) || defined (HAVE_FINITE)
// Some version of gcc on some old version of Linux used to crash when
// trying to make Inf and NaN.
#if defined (SCO)
double tmp = 1.0;
octave_Inf = 1.0 / (tmp - tmp);
#elif defined (linux)
octave_Inf = HUGE_VAL;
#elif defined (__alpha__)
extern unsigned int DINFINITY[2];
octave_Inf = (*((double *) (DINFINITY)));
#elif defined (HAVE_INFINITY)
octave_Inf = infinity ();
#else
double tmp = 1e+10;
octave_Inf = tmp;
for (;;)
{
octave_Inf *= 1e+10;
if (octave_Inf == tmp)
break;
tmp = octave_Inf;
}
#endif
#endif
#if defined (HAVE_ISNAN)
#if defined (linux)
octave_NaN = NAN;
#elif defined (__alpha__)
extern unsigned int DQNAN[2];
octave_NaN = (*((double *) (DQNAN)));
#elif defined (HAVE_QUIET_NAN)
octave_NaN = quiet_nan (0L);
#else
octave_NaN = octave_Inf / octave_Inf;
#endif
#endif
}
#if defined (SCO)
extern "C" int
isnan (double x)
{
return (IsNANorINF (x) && NaN (x) && ! IsINF (x)) ? 1 : 0;
}
extern "C" int
isinf (double x)
{
return (IsNANorINF (x) && IsINF (x)) ? 1 : 0;
}
#endif
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/
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