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 __cproj = cproj
31
32/* INDENT OFF */
33/*
34 * dcomplex cproj(dcomplex z);
35 *
36 * If one of the component of z = (x,y) is an inf, then
37 *	cproj(z) = (+inf, copysign(0,y));
38 * otherwise,
39 *	cproj(z) = z
40 */
41/* INDENT ON */
42
43#include "libm.h"			/* fabs */
44#include "complex_wrapper.h"
45
46static const double zero = 0.0;
47
48dcomplex
49cproj(dcomplex z) {
50	double x, y;
51	int ix, iy, hx, hy, lx, ly;
52
53	x = D_RE(z);
54	y = D_IM(z);
55	hx = HI_WORD(x);
56	lx = LO_WORD(x);
57	hy = HI_WORD(y);
58	ly = LO_WORD(y);
59	ix = hx & 0x7fffffff;
60	iy = hy & 0x7fffffff;
61	if (ISINF(iy, ly)) {
62		D_RE(z) = fabs(y);
63		D_IM(z) = hy >= 0 ? zero : -zero;
64	} else if (ISINF(ix, lx)) {
65		D_RE(z) = fabs(x);
66		D_IM(z) = hy >= 0 ? zero : -zero;
67	}
68	return (z);
69}
70