xref: /titanic_50/usr/src/cmd/sgs/tools/common/findprime.c (revision da14cebe459d3275048785f25bd869cb09b5307f)
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, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #include <sys/types.h>
30 
31 /*
32  * function that will find a prime'ish number.  Usefull for
33  * hashbuckets and related things.
34  */
35 uint_t
36 findprime(uint_t count)
37 {
38 	uint_t	h, f;
39 
40 	if (count <= 3)
41 		return (3);
42 
43 
44 	/*
45 	 * Check to see if divisible by two, if so
46 	 * increment.
47 	 */
48 	if ((count & 0x1) == 0)
49 		count++;
50 
51 	for (h = count, f = 2; f * f <= h; f++)
52 		if ((h % f) == 0)
53 			h += f = 1;
54 	return (h);
55 }
56