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rbtree.h: Add a wine_rb_prev iteration helper function. 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2017-09-07 19:31:26 +02:00
parent 917d98a457
commit c1d46149e0
1 changed files with 14 additions and 0 deletions
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14
include/wine/rbtree.h
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@ -101,6 +101,13 @@ static inline struct wine_rb_entry *wine_rb_head(struct wine_rb_entry *iter)
return iter;
}
static inline struct wine_rb_entry *wine_rb_tail(struct wine_rb_entry *iter)
{
if (!iter) return NULL;
while (iter->right) iter = iter->right;
return iter;
}
static inline struct wine_rb_entry *wine_rb_next(struct wine_rb_entry *iter)
{
if (iter->right) return wine_rb_head(iter->right);
@ -108,6 +115,13 @@ static inline struct wine_rb_entry *wine_rb_next(struct wine_rb_entry *iter)
return iter->parent;
}
static inline struct wine_rb_entry *wine_rb_prev(struct wine_rb_entry *iter)
{
if (iter->left) return wine_rb_tail(iter->left);
while (iter->parent && iter->parent->left == iter) iter = iter->parent;
return iter->parent;
}
static inline struct wine_rb_entry *wine_rb_postorder_head(struct wine_rb_entry *iter)
{
if (!iter) return NULL;