sudo-1.7.4p4/redblack.h

/*
 * Copyright (c) 2004, 2007 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _SUDO_REDBLACK_H
#define _SUDO_REDBLACK_H

enum rbcolor {
    red,
    black
};

enum rbtraversal {
    preorder,
    inorder,
    postorder
};

struct rbnode {
    struct rbnode *left, *right, *parent;
    void *data;
    enum rbcolor color;
};

struct rbtree {
    int (*compar) __P((const void *, const void *));
    struct rbnode root;
    struct rbnode nil;
};

#define rbapply(t, f, c, o)	rbapply_node((t), (t)->root.left, (f), (c), (o))
#define rbisempty(t)		((t)->root.left == &(t)->nil && (t)->root.right == &(t)->nil)
#define rbfirst(t)		((t)->root.left)
#define rbroot(t)		(&(t)->root)
#define rbnil(t)		(&(t)->nil)

void *rbdelete			__P((struct rbtree *, struct rbnode *));
int rbapply_node		__P((struct rbtree *, struct rbnode *,
				    int (*)(void *, void *), void *,
				    enum rbtraversal));
struct rbnode *rbfind		__P((struct rbtree *, void *));
struct rbnode *rbinsert		__P((struct rbtree *, void *));
struct rbtree *rbcreate		__P((int (*)(const void *, const void *)));
void rbdestroy			__P((struct rbtree *, void (*)(void *)));

#endif /* _SUDO_REDBLACK_H */