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+/* Produced by texiweb from libavl.w on 2003/01/06 at 18:07. */
+
+/* libavl - library for manipulation of binary trees.
+   Copyright (C) 1998-2002 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 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., 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.
+
+   The author may be contacted at <blp@gnu.org> on the Internet, or
+   write to Ben Pfaff, Stanford University, Computer Science Dept., 353
+   Serra Mall, Stanford CA 94305, USA.
+*/
+
+#ifndef AVL_H
+#define AVL_H 1
+
+#include <stddef.h>
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+/* Function types. */
+typedef int avl_comparison_func (const void *avl_a, const void *avl_b,
+                                 void *avl_param);
+typedef void avl_item_func (void *avl_item, void *avl_param);
+typedef void *avl_copy_func (void *avl_item, void *avl_param);
+
+#ifndef LIBAVL_ALLOCATOR
+#define LIBAVL_ALLOCATOR
+/* Memory allocator. */
+struct libavl_allocator
+  {
+    void *(*libavl_malloc) (struct libavl_allocator *, size_t libavl_size);
+    void (*libavl_free) (struct libavl_allocator *, void *libavl_block);
+  };
+#endif
+
+/* Default memory allocator. */
+extern struct libavl_allocator avl_allocator_default;
+void *avl_malloc (struct libavl_allocator *, size_t);
+void avl_free (struct libavl_allocator *, void *);
+
+/* Maximum AVL height. */
+#ifndef AVL_MAX_HEIGHT
+#define AVL_MAX_HEIGHT 32
+#endif
+
+/* Tree data structure. */
+struct avl_table
+  {
+    struct avl_node *avl_root;          /* Tree's root. */
+    avl_comparison_func *avl_compare;   /* Comparison function. */
+    void *avl_param;                    /* Extra argument to |avl_compare|. */
+    struct libavl_allocator *avl_alloc; /* Memory allocator. */
+    size_t avl_count;                   /* Number of items in tree. */
+    unsigned long avl_generation;       /* Generation number. */
+  };
+
+/* An AVL tree node. */
+struct avl_node
+  {
+    struct avl_node *avl_link[2];  /* Subtrees. */
+    void *avl_data;                /* Pointer to data. */
+    signed char avl_balance;       /* Balance factor. */
+  };
+
+/* AVL traverser structure. */
+struct avl_traverser
+  {
+    struct avl_table *avl_table;        /* Tree being traversed. */
+    struct avl_node *avl_node;          /* Current node in tree. */
+    struct avl_node *avl_stack[AVL_MAX_HEIGHT];
+                                        /* All the nodes above |avl_node|. */
+    size_t avl_height;                  /* Number of nodes in |avl_parent|. */
+    unsigned long avl_generation;       /* Generation number. */
+  };
+
+/* Table functions. */
+struct avl_table *avl_create (avl_comparison_func *, void *,
+                              struct libavl_allocator *);
+struct avl_table *avl_copy (const struct avl_table *, avl_copy_func *,
+                            avl_item_func *, struct libavl_allocator *);
+void avl_destroy (struct avl_table *, avl_item_func *);
+void **avl_probe (struct avl_table *, void *);
+void *avl_insert (struct avl_table *, void *);
+void *avl_replace (struct avl_table *, void *);
+void *avl_delete (struct avl_table *, const void *);
+void *avl_find (const struct avl_table *, const void *);
+void avl_assert_insert (struct avl_table *, void *);
+void *avl_assert_delete (struct avl_table *, void *);
+
+#define avl_count(table) ((size_t) (table)->avl_count)
+
+/* Table traverser functions. */
+void avl_t_init (struct avl_traverser *, struct avl_table *);
+void *avl_t_first (struct avl_traverser *, struct avl_table *);
+void *avl_t_last (struct avl_traverser *, struct avl_table *);
+void *avl_t_find (struct avl_traverser *, struct avl_table *, void *);
+void *avl_t_insert (struct avl_traverser *, struct avl_table *, void *);
+void *avl_t_copy (struct avl_traverser *, const struct avl_traverser *);
+void *avl_t_next (struct avl_traverser *);
+void *avl_t_prev (struct avl_traverser *);
+void *avl_t_cur (struct avl_traverser *);
+void *avl_t_replace (struct avl_traverser *, void *);
+
+#if defined(__cplusplus)
+}
+#endif  
+
+#endif /* avl.h */