1 /* $NetBSD: catanl.c,v 1.1 2014/10/10 00:48:18 christos Exp $ */
4 * Copyright (c) 2007 The NetBSD Foundation, Inc.
7 * This code is derived from software written by Stephen L. Moshier.
8 * It is redistributed by the NetBSD Foundation by permission of the author.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
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19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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35 #include "cephes_subrl.h"
37 #define MAXNUM LDBL_MAX
40 catanl(long double complex z)
42 long double complex w;
43 long double a, t, x, x2, y;
48 if ((x == 0.0L) && (y > 1.0L))
52 a = 1.0L - x2 - (y * y);
56 t = 0.5L * atan2l(2.0L * x, a);
66 w = w + (0.25L * logl(a)) * I;
70 w = MAXNUM + MAXNUM * I;