1 /* $NetBSD: citrus_db_hash.c,v 1.5 2008/02/09 14:56:20 junyoung Exp $ */ 2 /* $DragonFly: src/lib/libc/citrus/citrus_db_hash.c,v 1.2 2008/04/10 10:21:01 hasso Exp $ */ 3 4 5 /*- 6 * Copyright (c)2003 Citrus Project, 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <assert.h> 32 #include <stdio.h> 33 #include <string.h> 34 #include <sys/types.h> 35 36 #include "citrus_namespace.h" 37 #include "citrus_types.h" 38 #include "citrus_bcs.h" 39 #include "citrus_region.h" 40 #include "citrus_db_hash.h" 41 42 uint32_t 43 /*ARGSUSED*/ 44 _citrus_db_hash_std(void *closure __unused, struct _region *r) 45 { 46 const uint8_t *p = _region_head(r); 47 uint32_t hash = 0, tmp; 48 size_t i; 49 50 for (i = _region_size(r); i > 0; i--) { 51 hash <<= 4; 52 hash += _bcs_tolower(*p); 53 tmp = hash & 0xF0000000; 54 if (tmp != 0) { 55 hash ^= tmp; 56 hash ^= tmp >> 24; 57 } 58 p++; 59 } 60 return hash; 61 } 62