/* $NetBSD: catanl.c,v 1.1 2014/10/10 00:48:18 christos Exp $ */ /*- * Copyright (c) 2007 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software written by Stephen L. Moshier. * It is redistributed by the NetBSD Foundation by permission of the author. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include "cephes_subrl.h" #ifdef __weak_alias __weak_alias(catanl, _catanl) #endif long double complex catanl(long double complex z) { long double complex w; long double a, t, x, x2, y; x = creall(z); y = cimagl(z); if ((x == 0.0L) && (y > 1.0L)) goto ovrf; x2 = x * x; a = 1.0L - x2 - (y * y); t = 0.5L * atan2l(2.0L * x, a); w = _redupil(t); t = y - 1.0L; a = x2 + (t * t); if (a == 0.0L) goto ovrf; t = y + 1.0L; a = (x2 + (t * t))/a; w = w + (0.25L * logl(a)) * I; return w; ovrf: #if 0 mtherr ("catanl", OVERFLOW); #endif w = HUGE_VALL + HUGE_VALL * I; return w; }