/*

 * Copyright (c) 2010, 2015, 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

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 */

/*

 * @test

 * @bug 6893943 6937318

 * @summary exit code from javah with no args is 0

 * @modules jdk.compiler

 */

import java.io.*;

import java.util.*;

public class T6893943 {

    static final String[] NO_ARGS = { };

    static final String[] HELP = { "-help" };

    static final String NEWLINE = System.getProperty("line.separator");

    public static void main(String... args) throws Exception {

        new T6893943().run();

    }

    void run() throws Exception {

        testSimpleAPI(NO_ARGS, 1);

        testSimpleAPI(HELP, 0);

        testCommand(NO_ARGS, 1);

        testCommand(HELP, 0);

    }

    void testSimpleAPI(String[] args, int expect_rc) throws Exception {

        System.err.println("Test simple api: " + Arrays.asList(args));

        StringWriter sw = new StringWriter();

        PrintWriter pw = new PrintWriter(sw);

        int rc = com.sun.tools.javah.Main.run(args, pw);

        pw.close();

        expect("testSimpleAPI", sw.toString(), rc, expect_rc);

    }

    void testCommand(String[] args, int expect_rc) throws Exception {

        System.err.println("Test command: " + Arrays.asList(args));

        File javaHome = new File(System.getProperty("java.home"));

        List<String> command = new ArrayList<String>();

        command.add(new File(new File(javaHome, "bin"), "javah").getPath());

        command.addAll(Arrays.asList(args));

        //System.err.println("command: " + command);

        ProcessBuilder pb = new ProcessBuilder(command);

        pb.redirectErrorStream(true);

        Process p = pb.start();

        p.getOutputStream().close();

        StringWriter sw = new StringWriter();

        String line;

        BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));

        while ((line = in.readLine()) != null)

            sw.write(line + NEWLINE);

        int rc = p.waitFor();

        expect("testCommand", sw.toString(), rc, expect_rc);

    }

    void expect(String name, String out, int actual_rc, int expect_rc) throws Exception {

        if (out.isEmpty())

            throw new Exception("No output from javah");

        if (!out.startsWith("Usage:")) {

            System.err.println(out);

            throw new Exception("Unexpected output from javah");

        }

        if (actual_rc != expect_rc)

            throw new Exception(name + ": unexpected exit: " + actual_rc + ", expected: " + expect_rc);

    }

}