Copyright (C) 1988 The Institute of Software, Academia Sinica. Correspondence Address: P.O.Box 8718, Beijing, China 100080. Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notices appear in all copies and that both those copyright notices and this permission notice appear in supporting documentation, and that the name of "the Institute of Software, Academia Sinica" not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. The Institute of Software, Academia Sinica, makes no representations about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty. THE INSTITUTE OF SOFTWARE, ACADEMIA SINICA, DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE INSTITUTE OF SOFTWARE, ACADEMIA SINICA, BE LIABLE FOR ANY SPECIAL, 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.