11.1Schristos/* $NetBSD: catanl.c,v 1.1 2014/10/10 00:48:18 christos Exp $ */ 21.1Schristos 31.1Schristos/*- 41.1Schristos * Copyright (c) 2007 The NetBSD Foundation, Inc. 51.1Schristos * All rights reserved. 61.1Schristos * 71.1Schristos * This code is derived from software written by Stephen L. Moshier. 81.1Schristos * It is redistributed by the NetBSD Foundation by permission of the author. 91.1Schristos * 101.1Schristos * Redistribution and use in source and binary forms, with or without 111.1Schristos * modification, are permitted provided that the following conditions 121.1Schristos * are met: 131.1Schristos * 1. Redistributions of source code must retain the above copyright 141.1Schristos * notice, this list of conditions and the following disclaimer. 151.1Schristos * 2. Redistributions in binary form must reproduce the above copyright 161.1Schristos * notice, this list of conditions and the following disclaimer in the 171.1Schristos * documentation and/or other materials provided with the distribution. 181.1Schristos * 191.1Schristos * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 201.1Schristos * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 211.1Schristos * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 221.1Schristos * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 231.1Schristos * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 241.1Schristos * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 251.1Schristos * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 261.1Schristos * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 271.1Schristos * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 281.1Schristos * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 291.1Schristos * POSSIBILITY OF SUCH DAMAGE. 301.1Schristos */ 311.1Schristos 321.1Schristos#include "../src/namespace.h" 331.1Schristos#include <complex.h> 341.1Schristos#include <math.h> 351.1Schristos#include <float.h> 361.1Schristos#include "cephes_subrl.h" 371.1Schristos 381.1Schristos#ifdef __weak_alias 391.1Schristos__weak_alias(catanl, _catanl) 401.1Schristos#endif 411.1Schristos 421.1Schristos#define MAXNUM LDBL_MAX 431.1Schristos 441.1Schristoslong double complex 451.1Schristoscatanl(long double complex z) 461.1Schristos{ 471.1Schristos long double complex w; 481.1Schristos long double a, t, x, x2, y; 491.1Schristos 501.1Schristos x = creall(z); 511.1Schristos y = cimagl(z); 521.1Schristos 531.1Schristos if ((x == 0.0L) && (y > 1.0L)) 541.1Schristos goto ovrf; 551.1Schristos 561.1Schristos x2 = x * x; 571.1Schristos a = 1.0L - x2 - (y * y); 581.1Schristos if (a == 0.0) 591.1Schristos goto ovrf; 601.1Schristos 611.1Schristos t = 0.5L * atan2l(2.0L * x, a); 621.1Schristos w = _redupil(t); 631.1Schristos 641.1Schristos t = y - 1.0L; 651.1Schristos a = x2 + (t * t); 661.1Schristos if (a == 0.0L) 671.1Schristos goto ovrf; 681.1Schristos 691.1Schristos t = y + 1.0L; 701.1Schristos a = (x2 + (t * t))/a; 711.1Schristos w = w + (0.25L * logl(a)) * I; 721.1Schristos return w; 731.1Schristos 741.1Schristosovrf: 751.1Schristos#if 0 761.1Schristos mtherr ("catanl", OVERFLOW); 771.1Schristos#endif 781.1Schristos w = MAXNUM + MAXNUM * I; 791.1Schristos return w; 801.1Schristos} 81