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 __cacoshl = cacoshl
31
32#include "libm.h"	/* fabsl/isnanl/isinfl/signbitl */
33#include "complex_wrapper.h"
34#include "longdouble.h"
35
36/* INDENT OFF */
37/*
38 * ldcomplex cacoshl(ldcomplex z);
39 *	cacosh z = +-i cacos z .
40 * In order to make conj(cacosh(z))=cacosh(conj(z)),
41 * we define
42 *	cacosh z = sign(Im(z))*i cacos z .
43 *
44 */
45/* INDENT ON */
46
47ldcomplex
48cacoshl(ldcomplex z) {
49	ldcomplex w, ans;
50	long double x, y;
51
52	w = cacosl(z);
53	x = LD_RE(z);
54	y = LD_IM(z);
55	if (isnanl(y)) {
56		LD_IM(ans) = y + y;
57		if (isinfl(x))
58			LD_RE(ans) = fabsl(x);
59		else
60			LD_RE(ans) = y;
61	} else if (signbitl(y) == 0) {
62		LD_RE(ans) = -LD_IM(w);
63		LD_IM(ans) = LD_RE(w);
64	} else {
65		LD_RE(ans) = LD_IM(w);
66		LD_IM(ans) = -LD_RE(w);
67	}
68	return (ans);
69}
70