2 /* Copyright (C) 1989, 1990, 1991, 1992, 2002 Free Software Foundation, Inc.
3 Written by James Clark (jjc@jclark.com)
5 This file is part of groff.
7 groff is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 groff is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License along
18 with groff; see the file COPYING. If not, write to the Free Software
19 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 #define MUST_ALREADY_EXIST 2
25 static const char **table
;
26 static int table_used
;
27 static int table_size
;
29 static int block_size
;
32 symbol(const char *p
, int how
= 0);
34 unsigned long hash() const;
35 int operator ==(symbol
) const;
36 int operator !=(symbol
) const;
37 const char *contents() const;
43 extern const symbol NULL_SYMBOL
;
44 extern const symbol EMPTY_SYMBOL
;
46 inline symbol::symbol() : s(0)
50 inline int symbol::operator==(symbol p
) const
55 inline int symbol::operator!=(symbol p
) const
60 inline unsigned long symbol::hash() const
62 return (unsigned long)s
;
65 inline const char *symbol::contents() const
70 inline int symbol::is_null() const
75 inline int symbol::is_empty() const
77 return s
!= 0 && *s
== 0;
80 symbol
concat(symbol
, symbol
);