1 /* $NetBSD: ptable.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 #include "ptable.h" 23 #include "errarg.h" 24 #include "error.h" 25 26 unsigned long hash_string(const char *s) 27 { 28 assert(s != 0); 29 unsigned long h = 0, g; 30 while (*s != 0) { 31 h <<= 4; 32 h += *s++; 33 if ((g = h & 0xf0000000) != 0) { 34 h ^= g >> 24; 35 h ^= g; 36 } 37 } 38 return h; 39 } 40 41 static const unsigned table_sizes[] = { 42 101, 503, 1009, 2003, 3001, 4001, 5003, 10007, 20011, 40009, 43 80021, 160001, 500009, 1000003, 2000003, 4000037, 8000009, 44 16000057, 32000011, 64000031, 128000003, 0 45 }; 46 47 unsigned next_ptable_size(unsigned n) 48 { 49 const unsigned *p; 50 for (p = table_sizes; *p <= n; p++) 51 if (*p == 0) 52 fatal("cannot expand table"); 53 return *p; 54 } 55