diff options
Diffstat (limited to 'nasmlib/rbtree.c')
-rw-r--r-- | nasmlib/rbtree.c | 36 |
1 files changed, 26 insertions, 10 deletions
diff --git a/nasmlib/rbtree.c b/nasmlib/rbtree.c index 8b74c0c4..510f34b1 100644 --- a/nasmlib/rbtree.c +++ b/nasmlib/rbtree.c @@ -208,17 +208,36 @@ _rb_insert(struct rbtree *tree, struct rbtree *node) return tree; } +struct rbtree *rb_first(const struct rbtree *tree) +{ + if (unlikely(!tree)) + return NULL; + + while (!(tree->m.flags & RBTREE_NODE_PRED)) + tree = tree->m.left; + + return (struct rbtree *)tree; +} + +struct rbtree *rb_last(const struct rbtree *tree) +{ + if (unlikely(!tree)) + return NULL; + + while (!(tree->m.flags & RBTREE_NODE_SUCC)) + tree = tree->m.right; + + return (struct rbtree *)tree; +} + struct rbtree *rb_prev(const struct rbtree *node) { struct rbtree *np = node->m.left; if (node->m.flags & RBTREE_NODE_PRED) return np; - - while (!(np->m.flags & RBTREE_NODE_SUCC)) - np = np->m.right; - - return np; + else + return rb_last(np); } struct rbtree *rb_next(const struct rbtree *node) @@ -227,9 +246,6 @@ struct rbtree *rb_next(const struct rbtree *node) if (node->m.flags & RBTREE_NODE_SUCC) return np; - - while (!(np->m.flags & RBTREE_NODE_PRED)) - np = np->m.left; - - return np; + else + return rb_first(np); } |