Pacify "gcc -Wunused" for the input function from Flex.

[bison.git] / src / uniqstr.h

diff --git a/src/uniqstr.h b/src/uniqstr.h
index ab482bebab55dc5defcd565af79d7839ae61289b..04600e941187a24af5919511592d08078373a7c1 100644 (file)
--- a/src/uniqstr.h
+++ b/src/uniqstr.h
@@ -1,23 +1,21 @@
 /* Keeping a unique copy of strings.
 
-   Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2003, 2008, 2009 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
-   Bison is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
 
-   Bison is distributed in the hope that it will be useful,
+   This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with Bison; see the file COPYING.  If not, write to
-   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #ifndef UNIQSTR_H_
 # define UNIQSTR_H_
@@ -34,6 +32,10 @@ uniqstr uniqstr_new (char const *str);
 /* Two uniqstr values have the same value iff they are the same.  */
 #define UNIQSTR_EQ(USTR1, USTR2) ((USTR1) == (USTR2))
 
+/* Compare two uniqstr a la strcmp: negative for <, nul for =, and
+   positive for >.  Undefined order, relies on addresses.  */
+#define UNIQSTR_CMP(USTR1, USTR2) ((USTR1) - (USTR2))
+
 /*--------------------------------------.
 | Initializing, destroying, debugging.  |
 `--------------------------------------*/