1 /* $NetBSD: ctanl.c,v 1.1 2014/10/10 00:48:18 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2007 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
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.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
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
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
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
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include "../src/namespace.h"
33 #include <complex.h>
34 #include <math.h>
35 #include <float.h>
36 #include "cephes_subrl.h"
37
38 #define MAXNUM LDBL_MAX
39
40 long double complex
ctanl(long double complex z)41 ctanl(long double complex z)
42 {
43 long double complex w;
44 long double d;
45
46 d = cosl(2.0L * creall(z)) + coshl(2.0L * cimagl(z));
47
48 if (fabsl(d) < 0.25L)
49 d = _ctansl(z);
50
51 if (d == 0.0L) {
52 /* mtherr ("ctan", OVERFLOW); */
53 w = MAXNUM + MAXNUM * I;
54 return w;
55 }
56
57 w = sinl(2.0L * creall(z)) / d + (sinhl(2.0L * cimagl(z)) / d) * I;
58 return w;
59 }
60