1 /* $NetBSD: strhash.c,v 1.3 2007/09/25 08:19:09 junyoung Exp $ */ 2 3 /*- 4 * Copyright (c)2003, 2004 Citrus Project, 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #if defined(LIBC_SCCS) && !defined(lint) 31 __RCSID("$NetBSD: strhash.c,v 1.3 2007/09/25 08:19:09 junyoung Exp $"); 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/param.h> 35 #include <sys/types.h> 36 37 #include "libintl_local.h" 38 39 /* 40 * string hash function by P.J.Weinberger. 41 * this implementation is derived from src/lib/libc/citrus/citrus_db_hash.c. 42 */ 43 uint32_t 44 /*ARGSUSED*/ 45 __intl_string_hash(const char *str) 46 { 47 const uint8_t *p; 48 uint32_t hash = 0, tmp; 49 50 for (p = (const uint8_t *)str; *p; p++) { 51 hash <<= 4; 52 hash += *p; 53 tmp = hash & 0xF0000000; 54 if (tmp != 0) { 55 hash ^= tmp; 56 hash ^= tmp >> 24; 57 } 58 } 59 return hash; 60 } 61