/* Complex hyperbole tangent for long 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 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> #include "math_private.h" __complex__ long double __ctanhl (__complex__ long double x) { __complex__ long double res; if (!isfinite (__real__ x) || !isfinite (__imag__ x)) { if (__isinfl (__real__ x)) { __real__ res = __copysignl (1.0, __real__ x); __imag__ res = __copysignl (0.0, __imag__ x); } else if (__imag__ x == 0.0) { res = x; } else { __real__ res = __nanl (""); __imag__ res = __nanl (""); #ifdef FE_INVALID if (__isinfl (__imag__ x)) feraiseexcept (FE_INVALID); #endif } } else { long double sin2ix, cos2ix; long double den; __sincosl (2.0 * __imag__ x, &sin2ix, &cos2ix); den = (__ieee754_coshl (2.0 * __real__ x) + cos2ix); __real__ res = __ieee754_sinhl (2.0 * __real__ x) / den; __imag__ res = sin2ix / den; } return res; } weak_alias (__ctanhl, ctanhl)