X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Flibpspp%2Fabt.c;h=b776612922f2579b290f3a3657f12adb8efee0fe;hb=20ab4257de9330d8ad358fd8f66ebcd75bd1846a;hp=53e66f5118f677516b9bb358bfa6acc026f762d2;hpb=43b1296aafe7582e7dbe6c2b6a8b478d7d9b0fcf;p=pspp

diff --git a/src/libpspp/abt.c b/src/libpspp/abt.c
index 53e66f5118..b776612922 100644
--- a/src/libpspp/abt.c
+++ b/src/libpspp/abt.c
@@ -1,5 +1,5 @@
 /* PSPP - a program for statistical analysis.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+   Copyright (C) 2007, 2009 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
@@ -29,6 +29,7 @@
 #endif
 
 #include <libpspp/abt.h>
+#include <libpspp/cast.h>
 
 #include <stdbool.h>
 
@@ -118,7 +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;
@@ -145,8 +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);
     }
 
@@ -167,7 +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.
@@ -180,7 +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. */
@@ -280,7 +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;
@@ -307,7 +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);
     }
 }
 
@@ -332,7 +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);
     }
 }