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/* Return cosine of complex double value.
Copyright (C) 1997 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <complex.h>
#include <fenv.h>
#include <math.h>
__complex__ double
__ccos (__complex__ double x)
{
__complex__ double res;
if (!isfinite (__real__ x) || __isnan (__imag__ x))
{
if (__real__ x == 0.0 || __imag__ x == 0.0)
{
__real__ res = __nan ("");
__imag__ res = 0.0;
#ifdef FE_INVALID
if (__isinf (__real__ x))
feraiseexcept (FE_INVALID);
#endif
}
else if (__isinf (__imag__ x))
{
__real__ res = HUGE_VAL;
__imag__ res = __nan ("");
#ifdef FE_INVALID
if (__isinf (__real__ x))
feraiseexcept (FE_INVALID);
#endif
}
else
{
__real__ res = __nan ("");
__imag__ res = __nan ("");
#ifdef FE_INVALID
if (isfinite (__imag__ x))
feraiseexcept (FE_INVALID);
#endif
}
}
else
{
__complex__ double y;
__real__ y = -__imag__ x;
__imag__ y = __real__ x;
res = __ccosh (y);
}
return res;
}
weak_alias (__ccos, ccos)
#ifdef NO_LONG_DOUBLE
strong_alias (__ccos, __ccosl)
weak_alias (__ccos, ccosl)
#endif
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