42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
/* Compute projection of complex long double value to Riemann sphere.
|
|
Copyright (C) 1997-2013 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <complex.h>
|
|
#include <math.h>
|
|
|
|
|
|
__complex__ long double
|
|
__cprojl (__complex__ long double x)
|
|
{
|
|
if (isnan (__real__ x) && isnan (__imag__ x))
|
|
return x;
|
|
else if (!isfinite (__real__ x) || !isfinite (__imag__ x))
|
|
{
|
|
__complex__ long double res;
|
|
|
|
__real__ res = INFINITY;
|
|
__imag__ res = __copysignl (0.0, __imag__ x);
|
|
|
|
return res;
|
|
}
|
|
|
|
return x;
|
|
}
|
|
weak_alias (__cprojl, cprojl)
|