/*

 * Copyright (c) 2008, 2016, 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 4876942 6715251

 * @summary javap invoked without args does not print help screen

 * @modules jdk.jdeps/com.sun.tools.javap

 */

import java.io.*;

import java.util.zip.*;

public class T4876942 {

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

        new T4876942().run();

    }

    public void run() throws IOException {

        String output = javap();

        verify(output, "-public", "-protected", "-private"); // check that some of the options are listed

        if (errors > 0)

            throw new Error(errors + " found.");

    }

    String javap(String... args) {

        StringWriter sw = new StringWriter();

        PrintWriter out = new PrintWriter(sw);

        //sun.tools.javap.Main.entry(args);

        int rc = com.sun.tools.javap.Main.run(args, out);

        if (rc != (args.length == 0 ? 2 : 0))

            throw new Error("javap failed. rc=" + rc);

        out.close();

        return sw.toString();

    }

    void verify(String output, String... expects) {

        for (String expect: expects) {

            if (output.indexOf(expect)< 0)

                error(expect + " not found");

        }

    }

    void error(String msg) {

        System.err.println(msg);

        errors++;

    }

    int errors;

}