| /* $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 "../src/namespace.h" |
| #include <complex.h> |
| #include <math.h> |
| #include <float.h> |
| #include "cephes_subrl.h" |
| |
| #ifdef __weak_alias |
| __weak_alias(catanl, _catanl) |
| #endif |
| |
| #define MAXNUM LDBL_MAX |
| |
| 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); |
| if (a == 0.0) |
| goto ovrf; |
| |
| 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 = MAXNUM + MAXNUM * I; |
| return w; |
| } |