usr/src/cmd/sgs/tools/common/strhash.c

   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 <sgs.h>
  30
  31 /*
  32  * classic Bernstein k=33 hash function
  33  *
  34  * This routine is to be used for internal hashing of strings.  It's not
  35  * to be confused with elf_hash() which is the required ELF hashing
  36  * tool for ELF structures.
  37  */
  38 uint_t
  39 sgs_str_hash(const char *str)
  40 {
  41         uint_t  hash = 5381;
  42         int             c;
  43
  44         while ((c = *str++) != 0)
  45                 hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
  46         return (hash);
  47 }