| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| */ |
| #ifndef __SYS_AVL_H__ |
| #define __SYS_AVL_H__ |
| |
| |
| typedef struct avlnode { |
| struct avlnode *avl_forw; /* pointer to right child (> parent) */ |
| struct avlnode *avl_back; /* pointer to left child (< parent) */ |
| struct avlnode *avl_parent; /* parent pointer */ |
| struct avlnode *avl_nextino; /* next in-order; NULL terminated list*/ |
| char avl_balance; /* tree balance */ |
| } avlnode_t; |
| |
| /* |
| * avl-tree operations |
| */ |
| typedef struct avlops { |
| uintptr_t (*avl_start)(avlnode_t *); |
| uintptr_t (*avl_end)(avlnode_t *); |
| } avlops_t; |
| |
| #define AVL_START(tree, n) (*(tree)->avl_ops->avl_start)(n) |
| #define AVL_END(tree, n) (*(tree)->avl_ops->avl_end)(n) |
| |
| /* |
| * tree descriptor: |
| * root points to the root of the tree. |
| * firstino points to the first in the ordered list. |
| */ |
| typedef struct avltree_desc { |
| avlnode_t *avl_root; |
| avlnode_t *avl_firstino; |
| avlops_t *avl_ops; |
| short avl_flags; |
| } avltree_desc_t; |
| |
| /* possible values for avl_balance */ |
| |
| #define AVL_BACK 1 |
| #define AVL_BALANCE 0 |
| #define AVL_FORW 2 |
| |
| /* possible values for avl_flags */ |
| |
| #define AVLF_DUPLICITY 0x0001 /* no warnings on insert dups */ |
| |
| /* |
| * 'Exported' avl tree routines |
| */ |
| avlnode_t |
| *avl_insert( |
| avltree_desc_t *tree, |
| avlnode_t *newnode); |
| |
| void |
| avl_delete( |
| avltree_desc_t *tree, |
| avlnode_t *np); |
| |
| void |
| avl_insert_immediate( |
| avltree_desc_t *tree, |
| avlnode_t *afterp, |
| avlnode_t *newnode); |
| |
| void |
| avl_init_tree( |
| avltree_desc_t *tree, |
| avlops_t *ops); |
| |
| static inline avlnode_t * |
| avl_findrange( |
| avltree_desc_t *tree, |
| uintptr_t value) |
| { |
| avlnode_t *np = tree->avl_root; |
| |
| while (np) { |
| if (value < AVL_START(tree, np)) { |
| np = np->avl_back; |
| continue; |
| } |
| if (value >= AVL_END(tree, np)) { |
| np = np->avl_forw; |
| continue; |
| } |
| ASSERT(AVL_START(tree, np) <= value && |
| value < AVL_END(tree, np)); |
| return np; |
| } |
| return NULL; |
| } |
| |
| avlnode_t * |
| avl_find( |
| avltree_desc_t *tree, |
| uintptr_t value); |
| |
| avlnode_t * |
| avl_findanyrange( |
| avltree_desc_t *tree, |
| uintptr_t start, |
| uintptr_t end, |
| int checklen); |
| |
| |
| avlnode_t * |
| avl_findadjacent( |
| avltree_desc_t *tree, |
| uintptr_t value, |
| int dir); |
| |
| void |
| avl_findranges( |
| avltree_desc_t *tree, |
| uintptr_t start, |
| uintptr_t end, |
| avlnode_t **startp, |
| avlnode_t **endp); |
| |
| avlnode_t * |
| avl_firstino( |
| avlnode_t *root); |
| |
| avlnode_t * |
| avl_lastino( |
| avlnode_t *root); |
| |
| |
| #define AVL_PRECEED 0x1 |
| #define AVL_SUCCEED 0x2 |
| |
| #define AVL_INCLUDE_ZEROLEN 0x0000 |
| #define AVL_EXCLUDE_ZEROLEN 0x0001 |
| |
| #endif /* __SYS_AVL_H__ */ |