/* Return arc hyperbole cosine for long double value. Copyright (C) 1997, 1998 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 <math.h> __complex__ long double __cacoshl (__complex__ long double x) { __complex__ long double res; int rcls = fpclassify (__real__ x); int icls = fpclassify (__imag__ x); if (rcls <= FP_INFINITE || icls <= FP_INFINITE) { if (icls == FP_INFINITE) { __real__ res = HUGE_VALL; if (rcls == FP_NAN) __imag__ res = __nanl (""); else __imag__ res = __copysignl ((rcls == FP_INFINITE ? (__real__ x < 0.0 ? M_PIl - M_PI_4l : M_PI_4l) : M_PI_2l), __imag__ x); } else if (rcls == FP_INFINITE) { __real__ res = HUGE_VALL; if (icls >= FP_ZERO) __imag__ res = __copysignl (signbit (__real__ x) ? M_PIl : 0.0, __imag__ x); else __imag__ res = __nanl (""); } else { __real__ res = __nanl (""); __imag__ res = __nanl (""); } } else if (rcls == FP_ZERO && icls == FP_ZERO) { __real__ res = 0.0; __imag__ res = __copysignl (M_PI_2l, __imag__ x); } else { __complex__ long double y; __real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) - 1.0; __imag__ y = 2.0 * __real__ x * __imag__ x; y = __csqrtl (y); __real__ y += __real__ x; __imag__ y += __imag__ x; res = __clogl (y); } return res; } weak_alias (__cacoshl, cacoshl)