1 /*

     2  * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

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

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

    21  * questions.

    22  */

    23 

    24 /* @test

    25  * @bug 4175312

    26  * @summary Test StringReader.skip with negative param

    27  */

    28 

    29 import java.io.*;

    30 

    31 public class Skip {

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

    33         StringReader in = new StringReader("1234567");

    34 

    35         // Skip forward and read

    36         if (in.skip(3) != 3)

    37             throw new RuntimeException("skip(3) failed");

    38         if (in.read() != '4')

    39             throw new RuntimeException("post skip read failure");

    40 

    41         // Skip backward and read

    42         if (in.skip(-2) != -2)

    43             throw new RuntimeException("skip(-2) failed");

    44         if (in.read() != '3')

    45             throw new RuntimeException("read failed after negative skip");

    46 

    47         // Attempt to skip backward past the beginning and read

    48         if (in.skip(-6) != -3)

    49             throw new RuntimeException("skip(-6) failed");

    50         if (in.read() != '1')

    51             throw new RuntimeException("read after skip past beginning failed");

    52 

    53         // Skip beyond the end

    54         if (in.skip(30) != 6)

    55             throw new RuntimeException("skip(30) failed");

    56         if (in.read() != -1)

    57             throw new RuntimeException("read at EOF failed");

    58 

    59         // Test after reaching end of string

    60         if (in.skip(30) != 0)

    61             throw new RuntimeException("skip(30) failed");

    62         if (in.skip(-30) != 0)

    63             throw new RuntimeException("skip(30) failed");

    64     }

    65 }