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      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 (at) 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