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/* MACRO-CODED FAST FIXED AVL TREES IMPLEMENTATION IN C */
/* COPYRIGHT (C) 1998 VALERY SHCHEDRIN */
/* IT IS DISTRIBUTED UNDER GLPL (GNU GENERAL LIBRARY PUBLIC LICENSE) */
/*
* Manuel Novoa III Jan 2001
*
* Modified to decrease object size.
* Tree balancing is now done in a fuction rather than inline.
* Removed common code in balance by use of a goto.
* Added macro Avl_Tree_no_replace since ptrs_replace was not used.
* Prepended may symbols with "__" for possible conversion to extern.
*/
#define __Avl_balance_proto(objname, pr, root) \
static int __Avl_##objname##pr##balance(objname **root) \
{ \
objname *p; \
int ht_changed; \
p = *root; \
if (p->bal_##pr < -1) \
{ \
if (p->l_##pr->bal_##pr == 1) \
{ \
objname *pp; \
pp=p->l_##pr; *root=p->l_##pr->r_##pr; p->l_##pr = (*root)->r_##pr; \
(*root)->r_##pr = p; pp->r_##pr = (*root)->l_##pr; \
p = *root; p->l_##pr = pp; \
goto pr_common_ht_changed; \
} \
else \
{ \
ht_changed = (p->l_##pr ->bal_##pr)?1:0; \
*root = p->l_##pr ; \
p->l_##pr = (*root)->r_##pr ; (*root)->r_##pr = p; \
p->bal_##pr = - (++((*root)->bal_##pr )); \
} \
} \
else if (p->bal_##pr > 1) \
{ \
if (p->r_##pr->bal_##pr == -1) \
{ \
objname *pp; \
pp=p->r_##pr ; *root=p->r_##pr ->l_##pr ; p->r_##pr =(*root)->l_##pr ; \
(*root)->l_##pr = p; pp->l_##pr = (*root)->r_##pr ; \
p = *root; p->r_##pr = pp; \
pr_common_ht_changed: \
if (p->bal_##pr > 0) p->l_##pr ->bal_##pr = -p->bal_##pr ; \
else p->l_##pr ->bal_##pr = 0; \
if (p->bal_##pr < 0) p->r_##pr ->bal_##pr = -p->bal_##pr ; \
else p->r_##pr ->bal_##pr = 0; \
p->bal_##pr = 0; \
ht_changed = 1; \
} \
else \
{ \
ht_changed = (p->r_##pr ->bal_##pr)?1:0; \
*root = p->r_##pr ; \
p->r_##pr = (*root)->l_##pr ; (*root)->l_##pr = p; \
p->bal_##pr = - (--((*root)->bal_##pr )); \
} \
} else ht_changed = 0; \
return ht_changed; \
}
#define balance(objname, pr, root) \
__Avl_##objname##pr##balance(root)
#define __Avl_r_insert_proto(objname, pr, COMPARE) \
static int __Avl_##objname##pr##_r_insert(objname **root) \
{ \
int i; /* height increase */ \
if (!*root) \
{ \
*root = __Avl_##objname##pr##_new_node; \
__Avl_##objname##pr##_new_node = NULL; \
return 1; \
} \
COMPARE(i, __Avl_##objname##pr##_new_node, *root); \
\
if (i < 0) \
{ /* insert into the left subtree */ \
i = -__Avl_##objname##pr##_r_insert(&((*root)->l_##pr)); \
if (__Avl_##objname##pr##_new_node != NULL) return 0; /* already there */ \
} \
else if (i > 0) \
{ /* insert into the right subtree */ \
i = __Avl_##objname##pr##_r_insert(&((*root)->r_##pr)); \
if (__Avl_##objname##pr##_new_node != NULL) return 0; /* already there */ \
} \
else \
{ /* found */ \
__Avl_##objname##pr##_new_node = *root; \
return 0; \
} \
if (!i) return 0; \
(*root)->bal_##pr += i; /* update balance factor */ \
if ((*root)->bal_##pr) \
{ \
return 1 - balance(objname,pr,root); \
} \
else return 0; \
}
#define __Avl_r_delete_proto(objname,pr,COMPARE) \
static int __Avl_##objname##pr##_r_delete(objname **root) \
{ \
int i; /* height decrease */ \
\
if (!*root) return 0; /* not found */ \
\
COMPARE(i, __Avl_##objname##pr##_new_node, *root); \
\
if (i < 0) \
i = -__Avl_##objname##pr##_r_delete(&((*root)->l_##pr)); \
else if (i > 0) \
i = __Avl_##objname##pr##_r_delete(&((*root)->r_##pr)); \
else \
{ \
if (!(*root)->l_##pr) \
{ \
*root = (*root)->r_##pr; \
return 1; \
} \
else if (!(*root)->r_##pr) \
{ \
*root = (*root)->l_##pr; \
return 1; \
} \
else \
{ \
i = __Avl_##objname##pr##_r_delfix(&((*root)->r_##pr)); \
__Avl_##objname##pr##_new_node->l_##pr = (*root)->l_##pr; \
__Avl_##objname##pr##_new_node->r_##pr = (*root)->r_##pr; \
__Avl_##objname##pr##_new_node->bal_##pr = (*root)->bal_##pr; \
*root = __Avl_##objname##pr##_new_node; \
} \
} \
if (!i) return 0; \
(*root)->bal_##pr -= i; \
if ((*root)->bal_##pr) \
{ \
return balance(objname,pr,root); \
} \
return 1; \
}
#define __Avl_r_delfix_proto(objname,pr) \
static int __Avl_##objname##pr##_r_delfix(objname **root) \
{ \
int i; /* height decrease */ \
\
if (!(*root)->l_##pr) \
{ \
__Avl_##objname##pr##_new_node = *root; \
*root = (*root)->r_##pr; \
return 1; \
} \
i = -__Avl_##objname##pr##_r_delfix(&((*root)->l_##pr)); \
if (!i) return 0; \
(*root)->bal_##pr -= i; \
if ((*root)->bal_##pr) \
{ \
return balance(objname,pr,root); \
} \
return 1; \
}
#define __Avl_ins_proto(alias,objname,pr) \
objname *__##alias##_ins(objname *data) \
{ \
__Avl_##objname##pr##_new_node = data; \
(data)->l_##pr = NULL; \
(data)->r_##pr = NULL; \
(data)->bal_##pr = 0; \
__Avl_##objname##pr##_r_insert(&__Avl_##objname##pr##_tree); \
if (__Avl_##objname##pr##_new_node) \
return __Avl_##objname##pr##_new_node; \
return NULL; \
}
#define __Avl_del_proto(alias,objname,pr) \
void __##alias##_del(objname *data) \
{ \
__Avl_##objname##pr##_new_node = data; \
__Avl_##objname##pr##_r_delete(&__Avl_##objname##pr##_tree); \
}
#define __Avl_replace_proto(alias,objname,pr,COMPARE) \
void __##alias##_replace(objname *data) \
{ \
objname **p = &__Avl_##objname##pr##_tree; \
int cmp; \
while (*p) \
{ \
COMPARE(cmp, data, *p); \
if (cmp < 0) \
p = &((*p)->l_##pr); \
else if (cmp > 0) \
p = &((*p)->r_##pr); \
else \
{ \
(data)->l_##pr = (*p)->l_##pr; \
(data)->r_##pr = (*p)->r_##pr; \
(data)->bal_##pr = (*p)->bal_##pr; \
*p = data; \
return; \
} \
} \
}
#define Avl_Root(objname,pr) __Avl_##objname##pr##_tree
#define Avl_Tree_no_replace(alias,objname,pr,COMPARE) \
objname *__Avl_##objname##pr##_tree = NULL; \
static objname *__Avl_##objname##pr##_new_node; \
__Avl_balance_proto(objname, pr, root) \
__Avl_r_insert_proto(objname,pr,COMPARE) \
__Avl_r_delfix_proto(objname,pr) \
__Avl_r_delete_proto(objname,pr,COMPARE) \
__Avl_ins_proto(alias,objname,pr) \
__Avl_del_proto(alias,objname,pr)
#define Avl_Tree(alias,objname,pr,COMPARE) \
Avl_Tree_no_replace(alias,objname,pr,COMPARE) \
__Avl_replace_proto(alias,objname,pr,COMPARE)
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