* src/closure.h: New file.

* src/closure.c: Formatting changes, topological sort over the
functions, use of closure.h.
(initialize_closure, finalize_closure):  Rename as...
(new_closure, free_closure): these.  Adjust dependencies.
* src/LR0.c: Formatting changes, topological sort, use of
cloture.h.
(initialize_states): Rename as...
(new_states): this.
* src/Makefile.am (noinst_HEADERS): Adjust.

src/closure.h

@@ -0,0 +1,49 @@
+/* Subroutines for bison
+   Copyright (C) 1984, 1989, 2000 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 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.
+
+   Bison 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., 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.  */
+
+
+/* Subroutines of file LR0.c. */
+
+/* Allocates the itemset and ruleset vectors, and precomputes useful
+   data so that closure can be called.  n is the number of elements to
+   allocate for itemset.  */
+
+void new_closure PARAMS ((int n));
+
+
+/* Given a vector of item numbers ITEMS, of length N, set up ruleset
+   and itemset to indicate what rules could be run and which items
+   could be accepted when those items are the active ones.
+
+   ruleset contains a bit for each rule.  closure sets the bits for
+   all rules which could potentially describe the next input to be
+   read.
+
+   itemset is a vector of item numbers; itemsetend points to just
+   beyond the end of the part of it that is significant.  closure
+   places there the indices of all items which represent units of
+   input that could arrive next.  */
+
+void closure PARAMS ((short *items, int n));
+
+
+/* Frees itemset, ruleset and internal data.  */
+
+void free_closure PARAMS ((void));