doc: one of the fixes for an ambiguous grammar was ambiguous too

[bison.git] / src / relation.c

diff --git a/src/relation.c b/src/relation.c
index 441b0076e8d4ea6cdfceb6951a38fe8dff416976..49424c083ced16f7f74f914dd35458b7bc5a0177 100644 (file)
--- a/src/relation.c
+++ b/src/relation.c
@@ -1,23 +1,24 @@
 /* Binary relations.
-   Copyright (C) 2002, 2004 Free Software Foundation, Inc.
+
+   Copyright (C) 2002, 2004-2005, 2009-2012 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/>.  */
 
+#include <config.h>
 #include "system.h"
 
 #include <bitsetv.h>
@@ -123,6 +124,7 @@ relation_digraph (relation r, relation_node size, bitsetv *function)
 void
 relation_transpose (relation *R_arg, relation_node n)
 {
+  relation r = *R_arg;
   /* The result. */
   relation new_R = xnmalloc (n, sizeof *new_R);
   /* END_R[I] -- next entry of NEW_R[I]. */
@@ -135,14 +137,14 @@ relation_transpose (relation *R_arg, relation_node n)
   if (trace_flag & trace_sets)
     {
       fputs ("relation_transpose: input\n", stderr);
-      relation_print (*R_arg, n, stderr);
+      relation_print (r, n, stderr);
     }
 
   /* Count. */
   for (i = 0; i < n; i++)
-    if ((*R_arg)[i])
-      for (j = 0; (*R_arg)[i][j] != END_NODE; ++j)
-       ++nedges[(*R_arg)[i][j]];
+    if (r[i])
+      for (j = 0; r[i][j] != END_NODE; ++j)
+       ++nedges[r[i][j]];
 
   /* Allocate. */
   for (i = 0; i < n; i++)
@@ -159,20 +161,17 @@ relation_transpose (relation *R_arg, relation_node n)
 
   /* Store. */
   for (i = 0; i < n; i++)
-    if ((*R_arg)[i])
-      for (j = 0; (*R_arg)[i][j] != END_NODE; ++j)
-       {
-         *end_R[(*R_arg)[i][j]] = i;
-         ++end_R[(*R_arg)[i][j]];
-       }
+    if (r[i])
+      for (j = 0; r[i][j] != END_NODE; ++j)
+       *end_R[r[i][j]]++ = i;
 
   free (nedges);
   free (end_R);
 
   /* Free the input: it is replaced with the result. */
   for (i = 0; i < n; i++)
-    free ((*R_arg)[i]);
-  free (*R_arg);
+    free (r[i]);
+  free (r);
 
   if (trace_flag & trace_sets)
     {