1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate * Copyright (c) 1994-1997, by Sun Microsystems, Inc.
24*0Sstevel@tonic-gate * All rights reserved.
25*0Sstevel@tonic-gate */
26*0Sstevel@tonic-gate
27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI"
28*0Sstevel@tonic-gate
29*0Sstevel@tonic-gate /*
30*0Sstevel@tonic-gate * __dtoul(x) converts double x to unsigned long.
31*0Sstevel@tonic-gate */
32*0Sstevel@tonic-gate unsigned long
__dtoul(double x)33*0Sstevel@tonic-gate __dtoul(double x)
34*0Sstevel@tonic-gate {
35*0Sstevel@tonic-gate union {
36*0Sstevel@tonic-gate double d;
37*0Sstevel@tonic-gate unsigned long l;
38*0Sstevel@tonic-gate } u;
39*0Sstevel@tonic-gate
40*0Sstevel@tonic-gate u.d = x;
41*0Sstevel@tonic-gate
42*0Sstevel@tonic-gate /* handle cases for which double->unsigned long differs from */
43*0Sstevel@tonic-gate /* double->signed long */
44*0Sstevel@tonic-gate if ((u.l >> 52) == 0x43e) {
45*0Sstevel@tonic-gate /* 2^63 <= x < 2^64 */
46*0Sstevel@tonic-gate return (0x8000000000000000ul | (u.l << 11));
47*0Sstevel@tonic-gate }
48*0Sstevel@tonic-gate
49*0Sstevel@tonic-gate /* for all other cases, just convert to signed long */
50*0Sstevel@tonic-gate return ((long)x);
51*0Sstevel@tonic-gate }
52