Rework source layout in preparation for modular sudo.

plugins/sudoers/redblack.h

@@ -0,0 +1,58 @@
+/*
+ * 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 */