catanh.c revision ddc0e0b53c661f6e439e3b7072b3ef353eadb4af
125c28e8Piotr Jasiukajtis/*
225c28e8Piotr Jasiukajtis * CDDL HEADER START
325c28e8Piotr Jasiukajtis *
425c28e8Piotr Jasiukajtis * The contents of this file are subject to the terms of the
525c28e8Piotr Jasiukajtis * Common Development and Distribution License (the "License").
625c28e8Piotr Jasiukajtis * You may not use this file except in compliance with the License.
725c28e8Piotr Jasiukajtis *
825c28e8Piotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
925c28e8Piotr Jasiukajtis * or
1025c28e8Piotr Jasiukajtis * See the License for the specific language governing permissions
1125c28e8Piotr Jasiukajtis * and limitations under the License.
1225c28e8Piotr Jasiukajtis *
1325c28e8Piotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each
1425c28e8Piotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
1525c28e8Piotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the
1625c28e8Piotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying
1725c28e8Piotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner]
1825c28e8Piotr Jasiukajtis *
1925c28e8Piotr Jasiukajtis * CDDL HEADER END
2025c28e8Piotr Jasiukajtis */
2125c28e8Piotr Jasiukajtis
2225c28e8Piotr Jasiukajtis/*
2325c28e8Piotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
2425c28e8Piotr Jasiukajtis */
2525c28e8Piotr Jasiukajtis/*
2625c28e8Piotr Jasiukajtis * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
2725c28e8Piotr Jasiukajtis * Use is subject to license terms.
2825c28e8Piotr Jasiukajtis */
2925c28e8Piotr Jasiukajtis
30ddc0e0bRichard Lowe#pragma weak __catanh = catanh
3125c28e8Piotr Jasiukajtis
3225c28e8Piotr Jasiukajtis/* INDENT OFF */
3325c28e8Piotr Jasiukajtis/*
3425c28e8Piotr Jasiukajtis * z := x + iy
3525c28e8Piotr Jasiukajtis * catanh(z)	= -i catan(iz)
3625c28e8Piotr Jasiukajtis *		= -i catan(-y+ix)
3725c28e8Piotr Jasiukajtis *		= (Im(catan(-y+ix)), -Re(catan(-y+ix)))
3825c28e8Piotr Jasiukajtis */
3925c28e8Piotr Jasiukajtis/* INDENT ON */
4025c28e8Piotr Jasiukajtis
4125c28e8Piotr Jasiukajtis#include "libm.h"
4225c28e8Piotr Jasiukajtis#include "complex_wrapper.h"
4325c28e8Piotr Jasiukajtis
4425c28e8Piotr Jasiukajtisdcomplex
4525c28e8Piotr Jasiukajtiscatanh(dcomplex z) {
4625c28e8Piotr Jasiukajtis	double x, y;
4725c28e8Piotr Jasiukajtis	dcomplex ans, ct;
4825c28e8Piotr Jasiukajtis
4925c28e8Piotr Jasiukajtis	x = D_RE(z);
5025c28e8Piotr Jasiukajtis	y = D_IM(z);
5125c28e8Piotr Jasiukajtis	D_RE(z) = -y;
5225c28e8Piotr Jasiukajtis	D_IM(z) = x;
5325c28e8Piotr Jasiukajtis	ct = catan(z);
5425c28e8Piotr Jasiukajtis	D_RE(ans) = D_IM(ct);
5525c28e8Piotr Jasiukajtis	D_IM(ans) = -D_RE(ct);
5625c28e8Piotr Jasiukajtis	return (ans);
5725c28e8Piotr Jasiukajtis}