1 /* $NetBSD: common.cpp,v 1.1.1.1 2016/01/13 18:41:48 christos Exp $ */ 2 3 /* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc. 4 Written by James Clark (jjc@jclark.com) 5 6 This file is part of groff. 7 8 groff is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free 10 Software Foundation; either version 2, or (at your option) any later 11 version. 12 13 groff is distributed in the hope that it will be useful, but WITHOUT ANY 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16 for more details. 17 18 You should have received a copy of the GNU General Public License along 19 with groff; see the file COPYING. If not, write to the Free Software 20 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */ 21 22 unsigned hash(const char *s, int len) 23 { 24 #if 0 25 unsigned h = 0, g; 26 while (*s != '\0') { 27 h <<= 4; 28 h += *s++; 29 if ((g = h & 0xf0000000) != 0) { 30 h ^= g >> 24; 31 h ^= g; 32 } 33 } 34 #endif 35 unsigned h = 0; 36 while (--len >= 0) 37 h = *s++ + 65587*h; 38 return h; 39 } 40 41