Add native Windows binary for bison.

bison/src/bison/2.4.1/bison-2.4.1-src/src/graphviz.c

+/* Output Graphviz specification of a state machine generated by Bison.
+
+   Copyright (C) 2006, 2007 Free Software Foundation, Inc.
+
+   This file is part of Bison, the GNU Compiler Compiler.
+
+   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 3 of the License, or
+   (at your option) any later version.
+
+   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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Paul Eggert and Satya Kiran Popuri.  */
+
+#include <config.h>
+#include "system.h"
+
+#include <quotearg.h>
+
+#include "graphviz.h"
+
+/* Return an unambiguous printable representation for NAME, suitable
+   for C strings.  Use slot 2 since the user may use slots 0 and 1.  */
+
+static char const *
+quote (char const *name)
+{
+  return quotearg_n_style (2, c_quoting_style, name);
+}
+
+void
+start_graph (FILE *fout)
+{
+  fputs ("digraph Automaton {\n", fout);
+}
+
+void
+output_node (int id, char const *label, FILE *fout)
+{
+  fprintf (fout, "  %d [label=%s]\n", id, quote (label));
+}
+
+void
+output_edge (int source, int destination, char const *label,
+             char const *style, FILE *fout)
+{
+  fprintf (fout, "  %d -> %d [style=%s", source, destination, style);
+  if (label)
+    fprintf (fout, " label=%s", quote (label));
+  fputs ("]\n", fout);
+}
+
+void
+finish_graph (FILE *fout)
+{
+  fputs ("}\n", fout);
+}