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
29import java.io.*;
30
31public 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}
66