/*

 * Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/* @test

   @bug 4093646

   @summary Make sure readLine would not push back -1.

   */

import java.io.*;

public class ReadLinePushback {

    public static void main(String args[]) throws Exception {

        PushbackInputStream pis = new PushbackInputStream

            ((new StringBufferInputStream("\r")));

        DataInputStream dis = new DataInputStream(pis);

        String line = dis.readLine();

        if (line == null) {

            throw new Exception ("Got null, should return empty line");

        }

        int count = pis.available();

        if (count != 0) {

            throw new Exception ("Test failed: available() returns "

                                 + count + "when the file is empty");

        }

    }

}