Use 'unsigned char' instead of 'char' in many places, to reduce casts.

src/keyword.icc

@@ -0,0 +1,42 @@
+/* Inline Functions for keyword.{h,cc}.
+
+   Copyright (C) 1989-1998, 2000, 2002 Free Software Foundation, Inc.
+   Written by Douglas C. Schmidt <schmidt@ics.uci.edu>
+   and Bruno Haible <bruno@clisp.org>.
+
+   This file is part of GNU GPERF.
+
+   GNU GPERF 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.
+
+   GNU GPERF 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 this program; see the file COPYING.
+   If not, write to the Free Software Foundation, Inc.,
+   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* ----------------------------- Keyword class ----------------------------- */
+
+/* Constructor.  */
+INLINE
+Keyword::Keyword (const char *allchars, int allchars_length, const char *rest)
+  : _allchars (allchars), _allchars_length (allchars_length), _rest (rest)
+{
+}
+
+
+/* --------------------------- KeywordExt class --------------------------- */
+
+/* Constructor.  */
+INLINE
+KeywordExt::KeywordExt (const char *allchars, int allchars_length, const char *rest)
+  : Keyword (allchars, allchars_length, rest),
+    _final_index (-1)
+{
+}