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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 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., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include <complex.h>

#include <fenv.h>

#include <math.h>

#include "math_private.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