/* Return arc sine of a complex float type.

   Copyright (C) 1997-2018 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>

#include <math_private.h>

CFLOAT

M_DECL_FUNC (__casin) (CFLOAT x)

{

  CFLOAT res;

  if (isnan (__real__ x) || isnan (__imag__ x))

    {

      if (__real__ x == 0)

	{

	  res = x;

	}

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

	{

	  __real__ res = M_NAN;

	  __imag__ res = M_COPYSIGN (M_HUGE_VAL, __imag__ x);

	}

      else

	{

	  __real__ res = M_NAN;

	  __imag__ res = M_NAN;

	}

    }

  else

    {

      CFLOAT y;

      __real__ y = -__imag__ x;

      __imag__ y = __real__ x;

      y = M_SUF (__casinh) (y);

      __real__ res = __imag__ y;

      __imag__ res = -__real__ y;

    }

  return res;

}

declare_mgen_alias (__casin, casin)