1/*
2 * Copyright (c) 1997, 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
25/* @test
26   @bug 4085939
27   @summary Check for the correct behaviour of LineNumberInputStream.skip
28   */
29
30import java.io.*;
31
32
33public class Skip{
34
35    private static void dotest(LineNumberInputStream in , int curpos ,
36                               long total , long toskip , long expected)
37        throws Exception
38    {
39
40        try {
41
42            System.err.println("\n\nCurrently at pos = " + curpos +
43                               "\nTotal bytes in the Stream = " + total +
44                               "\nNumber of bytes to skip = " + toskip +
45                               "\nNumber of bytes that should be skipped = " +
46                               expected);
47
48            long skipped = in.skip(toskip);
49
50            System.err.println("actual number skipped: "+ skipped);
51
52            if ((skipped < 0) || (skipped > expected)) {
53                throw new RuntimeException("Unexpected number of bytes skipped");
54            }
55
56        } catch (IOException e) {
57            System.err.println("IOException is thrown - possible result");
58        } catch (Throwable e) {
59            throw new RuntimeException("Unexpected "+e+" is thrown!");
60        }
61
62    }
63
64    public static void main( String argv[] ) throws Exception {
65
66        LineNumberInputStream in = new LineNumberInputStream(new MyInputStream(11));
67
68        /* test for negative skip */
69        dotest(in,  0, 11, -23,  0);
70
71        /* check for skip beyond EOF starting from before EOF */
72        dotest(in,  0, 11,  20, 11);
73
74        /* check for skip after EOF */
75        dotest(in, -1, 11,  20,  0);
76
77    }
78
79}
80
81class MyInputStream extends InputStream {
82
83    private int readctr = 0;
84    private long endoffile;
85
86    public MyInputStream(long endoffile) {
87        this.endoffile = endoffile;
88    }
89
90    public int read() {
91
92        if (readctr == endoffile) {
93            return -1;
94        }
95        else {
96            readctr++;
97            return 0;
98        }
99    }
100
101    public int available() { return 0; }
102}
103