1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
24 */
25/*
26 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
27 * Use is subject to license terms.
28 */
29
30#pragma weak __catanh = catanh
31
32/* INDENT OFF */
33/*
34 * z := x + iy
35 * catanh(z)	= -i catan(iz)
36 *		= -i catan(-y+ix)
37 *		= (Im(catan(-y+ix)), -Re(catan(-y+ix)))
38 */
39/* INDENT ON */
40
41#include "libm.h"
42#include "complex_wrapper.h"
43
44dcomplex
45catanh(dcomplex z) {
46	double x, y;
47	dcomplex ans, ct;
48
49	x = D_RE(z);
50	y = D_IM(z);
51	D_RE(z) = -y;
52	D_IM(z) = x;
53	ct = catan(z);
54	D_RE(ans) = D_IM(ct);
55	D_IM(ans) = -D_RE(ct);
56	return (ans);
57}
58