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
hash_string(const char * s)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
next_ptable_size(unsigned n)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