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diff --git a/avl-1.4.0/avl.h b/avl-1.4.0/avl.h
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-/* libavl - manipulates AVL trees.
- Copyright (C) 1998, 1999 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 <pfaffben@pilot.msu.edu> on the
- Internet, or as Ben Pfaff, 12167 Airport Rd, DeWitt MI 48820, USA
- through more mundane means. */
-
-/* This is file avl.h in libavl. */
-
-#if !avl_h
-#define avl_h 1
-
-/* The default maximum height of 32 allows for AVL trees having
- between 5,704,880 and 4,294,967,295 nodes, depending on order of
- insertion. You may change this compile-time constant as you
- wish. */
-#ifndef AVL_MAX_HEIGHT
-#define AVL_MAX_HEIGHT 32
-#endif
-
-/* Structure for a node in an AVL tree. */
-typedef struct avl_node
- {
- void *data; /* Pointer to data. */
- struct avl_node *link[2]; /* Subtrees. */
- signed char bal; /* Balance factor. */
- char cache; /* Used during insertion. */
- signed char pad[2]; /* Unused. Reserved for threaded trees. */
- }
-avl_node;
-
-/* Used for traversing an AVL tree. */
-typedef struct avl_traverser
- {
- int init; /* Initialized? */
- int nstack; /* Top of stack. */
- const avl_node *p; /* Used for traversal. */
- const avl_node *stack[AVL_MAX_HEIGHT];/* Descended trees. */
- }
-avl_traverser;
-
-/* Initializer for avl_traverser. */
-#define AVL_TRAVERSER_INIT {0}
-
-/* Function types. */
-#if !AVL_FUNC_TYPES
-#define AVL_FUNC_TYPES 1
-typedef int (*avl_comparison_func) (const void *a, const void *b, void *param);
-typedef void (*avl_node_func) (void *data, void *param);
-typedef void *(*avl_copy_func) (void *data, void *param);
-#endif
-
-/* Structure which holds information about an AVL tree. */
-typedef struct avl_tree
- {
-#if PSPP
- struct arena **owner; /* Arena to store nodes. */
-#endif
- avl_node root; /* Tree root node. */
- avl_comparison_func cmp; /* Used to compare keys. */
- int count; /* Number of nodes in the tree. */
- void *param; /* Arbitary user data. */
- }
-avl_tree;
-
-#if PSPP
-#define MAYBE_ARENA struct arena **owner,
-#else
-#define MAYBE_ARENA /* nothing */
-#endif
-
-/* General functions. */
-avl_tree *avl_create (MAYBE_ARENA avl_comparison_func, void *param);
-void avl_destroy (avl_tree *, avl_node_func);
-void avl_free (avl_tree *);
-int avl_count (const avl_tree *);
-avl_tree *avl_copy (MAYBE_ARENA const avl_tree *, avl_copy_func);
-
-/* Walk the tree. */
-void avl_walk (const avl_tree *, avl_node_func, void *param);
-void *avl_traverse (const avl_tree *, avl_traverser *);
-#define avl_init_traverser(TRAVERSER) ((TRAVERSER)->init = 0)
-
-/* Search for a given item. */
-void **avl_probe (avl_tree *, void *);
-void *avl_delete (avl_tree *, const void *);
-void *avl_find (const avl_tree *, const void *);
-void *avl_find_close (const avl_tree *, const void *);
-
-#if __GCC__ >= 2
-extern inline void *
-avl_insert (avl_tree *tree, void *item)
-{
- void **p = avl_probe (tree, item);
- return (*p == item) ? NULL : *p;
-}
-
-extern inline void *
-avl_replace (avl_tree *tree, void *item)
-{
- void **p = avl_probe (tree, item);
- if (*p == item)
- return NULL;
- else
- {
- void *r = *p;
- *p = item;
- return r;
- }
-}
-#else /* not gcc */
-void *avl_insert (avl_tree *tree, void *item);
-void *avl_replace (avl_tree *tree, void *item);
-#endif /* not gcc */
-
-/* Easy assertions on insertion & deletion. */
-#ifndef NDEBUG
-#define avl_force_insert(A, B) \
- do \
- { \
- void *r = avl_insert (A, B); \
- assert (r == NULL); \
- } \
- while (0)
-void *avl_force_delete (avl_tree *, void *);
-#else
-#define avl_force_insert(A, B) \
- avl_insert (A, B)
-#define avl_force_delete(A, B) \
- avl_delete (A, B)
-#endif
-
-#endif /* avl_h */