1 /* $NetBSD: cur_hash.c,v 1.12 2005/02/18 22:16:27 dsl Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. 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 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)cur_hash.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: cur_hash.c,v 1.12 2005/02/18 22:16:27 dsl Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/types.h> 42 43 #include "curses.h" 44 #include "curses_private.h" 45 46 /* 47 * __hash_more() is "hashpjw" from the Dragon Book, Aho, Sethi & Ullman, p.436. 48 */ 49 u_int 50 __hash_more(const void *v_s, size_t len, u_int h) 51 { 52 u_int g; 53 size_t i = 0; 54 const char *s = v_s; 55 56 while (i < len) { 57 h = (h << 4) + s[i]; 58 if ((g = h & 0xf0000000) != 0) { 59 h = h ^ (g >> 24); 60 h = h ^ g; 61 } 62 i++; 63 } 64 return h; 65 } 66