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 http://www.opensolaris.org/os/licensing.
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 __csin = csin
3125c28e8Piotr Jasiukajtis
3225c28e8Piotr Jasiukajtis/* INDENT OFF */
3325c28e8Piotr Jasiukajtis/*
3425c28e8Piotr Jasiukajtis * dcomplex csin(dcomplex z);
3525c28e8Piotr Jasiukajtis *
3625c28e8Piotr Jasiukajtis * If z = x+iy, then since csin(iz) = i*csinh(z),  we have
3725c28e8Piotr Jasiukajtis *
3825c28e8Piotr Jasiukajtis * csin(z)	= csin((-1)*(-z)) = csin(i*i*(-z))
3925c28e8Piotr Jasiukajtis *		= i*csinh(i*(-z)) = i*csinh(i*(-x-yi))
4025c28e8Piotr Jasiukajtis *		= i*csinh(y-ix)
4125c28e8Piotr Jasiukajtis *		= -Im(csinh(y-ix))+i*Re(csinh(y-ix))
4225c28e8Piotr Jasiukajtis */
4325c28e8Piotr Jasiukajtis/* INDENT ON */
4425c28e8Piotr Jasiukajtis
4525c28e8Piotr Jasiukajtis#include "libm.h"
4625c28e8Piotr Jasiukajtis#include "complex_wrapper.h"
4725c28e8Piotr Jasiukajtis
4825c28e8Piotr Jasiukajtisdcomplex
4925c28e8Piotr Jasiukajtiscsin(dcomplex z) {
5025c28e8Piotr Jasiukajtis	double x, y;
5125c28e8Piotr Jasiukajtis	dcomplex ans, ct;
5225c28e8Piotr Jasiukajtis
5325c28e8Piotr Jasiukajtis	x = D_RE(z);
5425c28e8Piotr Jasiukajtis	y = D_IM(z);
5525c28e8Piotr Jasiukajtis	D_RE(z) = y;
5625c28e8Piotr Jasiukajtis	D_IM(z) = -x;
5725c28e8Piotr Jasiukajtis	ct = csinh(z);
5825c28e8Piotr Jasiukajtis	D_RE(ans) = -D_IM(ct);
5925c28e8Piotr Jasiukajtis	D_IM(ans) = D_RE(ct);
6025c28e8Piotr Jasiukajtis	return (ans);
6125c28e8Piotr Jasiukajtis}