mirror of
https://github.com/reactos/reactos.git
synced 2024-09-22 18:45:51 +00:00
c424146e2c
svn path=/branches/cmake-bringup/; revision=48236
98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
/* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include <precomp.h>
|
|
|
|
|
|
/*
|
|
* @implemented
|
|
*/
|
|
int _isnan(double __x)
|
|
{
|
|
union
|
|
{
|
|
double* __x;
|
|
double_s* x;
|
|
} x;
|
|
x.__x = &__x;
|
|
return ( x.x->exponent == 0x7ff && ( x.x->mantissah != 0 || x.x->mantissal != 0 ));
|
|
}
|
|
|
|
int _isnanl(long double __x)
|
|
{
|
|
/* Intel's extended format has the normally implicit 1 explicit
|
|
present. Sigh! */
|
|
union
|
|
{
|
|
long double* __x;
|
|
long_double_s* x;
|
|
} x;
|
|
x.__x = &__x;
|
|
|
|
|
|
/* IEEE 854 NaN's have the maximum possible
|
|
exponent and a nonzero mantissa. */
|
|
|
|
return (( x.x->exponent == 0x7fff)
|
|
&& ( (x.x->mantissah & 0x80000000) != 0)
|
|
&& ( (x.x->mantissah & (unsigned int)0x7fffffff) != 0 || x.x->mantissal != 0 ));
|
|
}
|
|
|
|
int _isinf(double __x)
|
|
{
|
|
union
|
|
{
|
|
double* __x;
|
|
double_s* x;
|
|
} x;
|
|
|
|
x.__x = &__x;
|
|
return ( x.x->exponent == 0x7ff && ( x.x->mantissah == 0 && x.x->mantissal == 0 ));
|
|
}
|
|
|
|
/*
|
|
* @implemented
|
|
*/
|
|
int _finite( double x )
|
|
{
|
|
return !_isinf(x);
|
|
}
|
|
|
|
int _isinfl(long double __x)
|
|
{
|
|
/* Intel's extended format has the normally implicit 1 explicit
|
|
present. Sigh! */
|
|
union
|
|
{
|
|
long double* __x;
|
|
long_double_s* x;
|
|
} x;
|
|
|
|
x.__x = &__x;
|
|
|
|
|
|
/* An IEEE 854 infinity has an exponent with the
|
|
maximum possible value and a zero mantissa. */
|
|
|
|
|
|
if ( x.x->exponent == 0x7fff && ( (x.x->mantissah == 0x80000000 ) && x.x->mantissal == 0 ))
|
|
return x.x->sign ? -1 : 1;
|
|
return 0;
|
|
}
|