ebtree/ebsttree.c

/*
 * Elastic Binary Trees - exported functions for String data nodes.
 * Version 5.1
 * (C) 2002-2009 - Willy Tarreau <w@1wt.eu>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

/* Consult ebsttree.h for more details about those functions */

#include "ebsttree.h"

/* Find the first occurence of a zero-terminated string <x> in the tree <root>.
 * It's the caller's reponsibility to use this function only on trees which
 * only contain zero-terminated strings. If none can be found, return NULL.
 */
REGPRM2 struct ebmb_node *ebst_lookup(struct eb_root *root, const char *x)
{
	return __ebst_lookup(root, x);
}

/* Find the first occurence of a length <len> string <x> in the tree <root>.
 * It's the caller's reponsibility to use this function only on trees which
 * only contain zero-terminated strings, and that no null character is present
 * in string <x> in the first <len> chars. If none can be found, return NULL.
 */
REGPRM3 struct ebmb_node *ebst_lookup_len(struct eb_root *root, const char *x, unsigned int len)
{
	struct ebmb_node *node;

	node = ebmb_lookup(root, x, len);
	if (!node || node->key[len] != 0)
		return NULL;
	return node;
}

/* Insert ebmb_node <new> into subtree starting at node root <root>. Only
 * new->key needs be set with the zero-terminated string key. The ebmb_node is
 * returned. If root->b[EB_RGHT]==1, the tree may only contain unique keys. The
 * caller is responsible for properly terminating the key with a zero.
 */
REGPRM2 struct ebmb_node *ebst_insert(struct eb_root *root, struct ebmb_node *new)
{
	return __ebst_insert(root, new);
}