test/jdk/java/io/CharArrayReader/OverflowInSkip.java

/*
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 * 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.
 *
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 */

/* @test
 * @bug 8163518
 * @summary Integer overflow when skipping a lot
 */

import java.io.CharArrayReader;

public class OverflowInSkip {
    public static void main(String[] args) throws Exception {
        char[] a = "_123456789_123456789_123456789_123456789"
                .toCharArray(); // a.length > 33
        try (CharArrayReader car = new CharArrayReader(a)) {
            long small = 33;
            long big = Long.MAX_VALUE;

            long smallSkip = car.skip(small);
            if (smallSkip != small)
                throw new Exception("Expected to skip " + small
                        + " chars, but skipped " + smallSkip);

            long expSkip = a.length - small;
            long bigSkip = car.skip(big);
            if (bigSkip != expSkip)
                throw new Exception("Expected to skip " + expSkip
                        + " chars, but skipped " + bigSkip);
        }
    }
}