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/* Complex sine function for double.

   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

__csin (__complex__ double x)

{

  __complex__ double retval;

  int negate = signbit (__real__ x);

  int rcls = fpclassify (__real__ x);

  int icls = fpclassify (__imag__ x);

  __real__ x = fabs (__real__ x);

  if (icls >= FP_ZERO)

    {

      /* Imaginary part is finite.  */

      if (rcls >= FP_ZERO)

        {

          /* Real part is finite.  */

          double sinh_val = __ieee754_sinh (__imag__ x);

          double cosh_val = __ieee754_cosh (__imag__ x);

          double sinix, cosix;

          __sincos (__real__ x, &sinix, &cosix);

          __real__ retval = cosh_val * sinix;

          __imag__ retval = sinh_val * cosix;

          if (negate)

            __real__ retval = -__real__ retval;

        }

      else

        {

          if (icls == FP_ZERO)

            {

              /* Imaginary part is 0.0.  */

              __real__ retval = __nan ("");

              __imag__ retval = __imag__ x;

#ifdef FE_INVALID

              if (rcls == FP_INFINITE)

                feraiseexcept (FE_INVALID);

#endif

            }

          else

            {

              __real__ retval = __nan ("");

              __imag__ retval = __nan ("");

#ifdef FE_INVALID

              feraiseexcept (FE_INVALID);

#endif

            }

        }

    }

  else if (icls == FP_INFINITE)

    {

      /* Imaginary part is infinite.  */

      if (rcls == FP_ZERO)

        {

          /* Real part is 0.0.  */

          __real__ retval = __copysign (0.0, negate ? -1.0 : 1.0);

          __imag__ retval = __imag__ x;

        }

      else if (rcls > FP_ZERO)

        {

          /* Real part is finite.  */

          double sinix, cosix;

          __sincos (__real__ x, &sinix, &cosix);

          __real__ retval = __copysign (HUGE_VAL, sinix);

          __imag__ retval = __copysign (HUGE_VAL, cosix);

          if (negate)

            __real__ retval = -__real__ retval;

          if (signbit (__imag__ x))

            __imag__ retval = -__imag__ retval;

        }

      else

        {

          /* The addition raises the invalid exception.  */

          __real__ retval = __nan ("");

          __imag__ retval = HUGE_VAL;

#ifdef FE_INVALID

          if (rcls == FP_INFINITE)

            feraiseexcept (FE_INVALID);

#endif

        }

    }

  else

    {

      if (rcls == FP_ZERO)

        __real__ retval = __copysign (0.0, negate ? -1.0 : 1.0);

      else

        __real__ retval = __nan ("");

      __imag__ retval = __nan ("");

    }

  return retval;

}

weak_alias (__csin, csin)

#ifdef NO_LONG_DOUBLE

strong_alias (__csin, __csinl)

weak_alias (__csin, csinl)

#endif