xref: /illumos-gate/usr/src/cmd/sgs/common/strhash.c (revision 74e12c43fe52f2c30f36e65a4d0fb0e8dfd7068a)
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 #include <sgs.h>
28 
29 /*
30  * classic Bernstein k=33 hash function
31  *
32  * This routine is to be used for internal hashing of strings.  It's not
33  * to be confused with elf_hash() which is the required ELF hashing
34  * tool for ELF structures.
35  */
36 uint_t
37 sgs_str_hash(const char *str)
38 {
39 	uint_t	hash = 5381;
40 	int		c;
41 
42 	while ((c = *str++) != 0)
43 		hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
44 	return (hash);
45 }
46