/*

 * Copyright (c) 1997, 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 4085938

   @summary Check for the correct behaviour of DataInputStream.skipBytes

   */

import java.io.*;

public class SkipBytes{

    private static void dotest(DataInputStream dis, int pos, int total,

                               int toskip, int expected) {

        try {

            System.err.println("\n\nTotal bytes in the stream = " + total);

            System.err.println("Currently at position = " + pos);

            System.err.println("Bytes to skip = " + toskip);

            System.err.println("Expected result = " + expected);

            int skipped = dis.skipBytes(toskip);

            System.err.println("Actual skipped = " + skipped);

            if (skipped != expected) {

                throw new RuntimeException

                    ("DataInputStream.skipBytes does not return expected value");

            }

        } catch(EOFException e){

            throw new RuntimeException

                ("DataInputStream.skipBytes throws unexpected EOFException");

        } catch (IOException e) {

            System.err.println("IOException is thrown - possible result");

        }

    }

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

        DataInputStream dis = new DataInputStream(new MyInputStream());

        dotest(dis, 0, 11, -1, 0);

        dotest(dis, 0, 11, 5, 5);

        System.err.println("\n***CAUTION**** - may go into an infinite loop");

        dotest(dis, 5, 11, 20, 6);

    }

}

class MyInputStream extends InputStream {

    private int readctr = 0;

    public int read() {

        if (readctr > 10){

            return -1;

        }

        else{

            readctr++;

            return 0;

        }

    }

    public int available() { return 0; }

}