X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Flibpspp%2Fabt.c;h=ae746183021203605efa169e6989c7cc05844ec3;hb=5b5099296b3c7212623991de8920e1459e234922;hp=12da494a025fbc81c003b788b88aac9ca76c1669;hpb=f5c108becd49d78f4898cab11352291f5689d24e;p=pspp

diff --git a/src/libpspp/abt.c b/src/libpspp/abt.c
index 12da494a02..ae74618302 100644
--- a/src/libpspp/abt.c
+++ b/src/libpspp/abt.c
@@ -1,20 +1,18 @@
-/* PSPP - computes sample statistics.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+/* PSPP - a program for statistical analysis.
+   Copyright (C) 2007, 2009, 2011 Free Software Foundation, Inc.
 
-   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 of the
-   License, or (at your option) any later version.
+   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.
+   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, 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/>. */
 
 /* Augmented binary tree (ABT) data structure. */
 
@@ -30,11 +28,12 @@
 #include <config.h>
 #endif
 
-#include <libpspp/abt.h>
+#include "libpspp/abt.h"
 
 #include <stdbool.h>
 
-#include <libpspp/assertion.h>
+#include "libpspp/cast.h"
+#include "libpspp/assertion.h"
 
 static struct abt_node **down_link (struct abt *, struct abt_node *);
 static struct abt_node *skew (struct abt *, struct abt_node *);
@@ -120,7 +119,7 @@ abt_insert (struct abt *abt, struct abt_node *node)
    the tree, if AFTER is true, or the last node, if AFTER is
    false. */
 static inline void
-insert_relative (struct abt *abt, struct abt_node *p, bool after,
+insert_relative (struct abt *abt, const struct abt_node *p, bool after,
                  struct abt_node *node)
 {
   node->down[0] = NULL;
@@ -147,8 +146,8 @@ insert_relative (struct abt *abt, struct abt_node *p, bool after,
           p = p->down[dir];
           dir = !after;
         }
-      p->down[dir] = node;
-      node->up = p;
+      CONST_CAST (struct abt_node *, p)->down[dir] = node;
+      node->up = CONST_CAST (struct abt_node *, p);
       abt_reaugmented (abt, node);
     }
 
@@ -169,7 +168,7 @@ abt_insert_after (struct abt *abt,
                   const struct abt_node *p, struct abt_node *node)
 {
   assert (abt->compare == NULL);
-  insert_relative (abt, (struct abt_node *) p, true, node);
+  insert_relative (abt, p, true, node);
 }
 
 /* Inserts NODE before node P in ABT.
@@ -182,7 +181,7 @@ abt_insert_before (struct abt *abt,
                    const struct abt_node *p, struct abt_node *node)
 {
   assert (abt->compare == NULL);
-  insert_relative (abt, (struct abt_node *) p, false, node);
+  insert_relative (abt, p, false, node);
 }
 
 /* Deletes P from ABT. */
@@ -282,7 +281,7 @@ abt_find (const struct abt *abt, const struct abt_node *target)
     {
       cmp = abt->compare (target, p, abt->aux);
       if (cmp == 0)
-        return (struct abt_node *) p;
+        return CONST_CAST (struct abt_node *, p);
     }
 
   return NULL;
@@ -309,7 +308,7 @@ abt_next (const struct abt *abt, const struct abt_node *p)
       p = p->down[1];
       while (p->down[0] != NULL)
         p = p->down[0];
-      return (struct abt_node *) p;
+      return CONST_CAST (struct abt_node *, p);
     }
 }
 
@@ -334,7 +333,7 @@ abt_prev (const struct abt *abt, const struct abt_node *p)
       p = p->down[0];
       while (p->down[1] != NULL)
         p = p->down[1];
-      return (struct abt_node *) p;
+      return CONST_CAST (struct abt_node *, p);
     }
 }
 
@@ -352,7 +351,7 @@ void
 abt_reaugmented (const struct abt *abt, struct abt_node *p)
 {
   for (; p != NULL; p = p->up)
-    abt->reaugment (p, p->down[0], p->down[1], abt->aux);
+    abt->reaugment (p, abt->aux);
 }
 
 /* Moves P around in ABT to compensate for its key having
@@ -453,8 +452,8 @@ skew (struct abt *abt, struct abt_node *a)
       b->up = a->up;
       a->up = b;
 
-      abt->reaugment (a, a->down[0], a->down[1], abt->aux);
-      abt->reaugment (b, b->down[0], b->down[1], abt->aux);
+      abt->reaugment (a, abt->aux);
+      abt->reaugment (b, abt->aux);
 
       return b;
     }
@@ -484,8 +483,8 @@ split (struct abt *abt, struct abt_node *a)
 
       b->level++;
 
-      abt->reaugment (a, a->down[0], a->down[1], abt->aux);
-      abt->reaugment (b, b->down[0], b->down[1], abt->aux);
+      abt->reaugment (a, abt->aux);
+      abt->reaugment (b, abt->aux);
 
       return b;
     }