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/* Return arc sine of complex __float128 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 "quadmath-imp.h"

__complex128

casinq (__complex128 x)

{

  __complex128 res;

  if (isnanq (__real__ x) || isnanq (__imag__ x))

    {

      if (__real__ x == 0.0)

        {

          res = x;

        }

      else if (isinfq (__real__ x) || isinfq (__imag__ x))

        {

          __real__ res = nanq ("");

          __imag__ res = copysignq (HUGE_VALQ, __imag__ x);

        }

      else

        {

          __real__ res = nanq ("");

          __imag__ res = nanq ("");

        }

    }

  else

    {

      __complex128 y;

      __real__ y = -__imag__ x;

      __imag__ y = __real__ x;

      y = casinhq (y);

      __real__ res = __imag__ y;

      __imag__ res = -__real__ y;

    }

  return res;

}