genode/base/include/util/avl_string.h

/*
 * \brief  Utility for handling strings as AVL-node keys
 * \author Norman Feske
 * \date   2006-07-12
 */

/*
 * Copyright (C) 2006-2011 Genode Labs GmbH
 *
 * This file is part of the Genode OS framework, which is distributed
 * under the terms of the GNU General Public License version 2.
 */

#ifndef _INCLUDE__UTIL__AVL_STRING_H_
#define _INCLUDE__UTIL__AVL_STRING_H_

#include <util/avl_tree.h>
#include <util/string.h>

namespace Genode {

	class Avl_string_base : public Avl_node<Avl_string_base>
	{
		private:

			const char *_str;

		protected:

			Avl_string_base(const char *str) : _str(str) { }

		public:

			const char *name() const { return _str; }


			/************************
			 ** Avl node interface **
			 ************************/

			bool higher(Avl_string_base *c) { return (strcmp(c->_str, _str) > 0); }

			/**
			 * Find by name
			 */
			Avl_string_base *find_by_name(const char *name)
			{
				if (strcmp(name, _str) == 0) return this;

				Avl_string_base *c = Avl_node<Avl_string_base>::child(strcmp(name, _str) > 0);
				return c ? c->find_by_name(name) : 0;
			}
	};


	/*
	 * The template pumps up the Avl_string_base object and
	 * provides the buffer for the actual string.
	 */
	template <int STR_LEN>
	class Avl_string : public Avl_string_base
	{
		private:

			char _str_buf[STR_LEN];

		public:

			Avl_string(const char *str) : Avl_string_base(_str_buf)
			{
				strncpy(_str_buf, str, sizeof(_str_buf));
				_str_buf[STR_LEN - 1] = 0;
			}
	};
}

#endif /* _INCLUDE__UTIL__AVL_STRING_H_ */