1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
/*
* Copyright (c) 1998, 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
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
@bug 4090383
@summary Ensure that BufferedReader's read method will fill the target array
whenever possible
*/
import java.io.IOException;
import java.io.Reader;
import java.io.BufferedReader;
public class Fill {
/**
* A simple Reader that is always ready but may read fewer than the
* requested number of characters
*/
static class Source extends Reader {
int shortFall;
char next = 0;
Source(int shortFall) {
this.shortFall = shortFall;
}
public int read(char[] cbuf, int off, int len) throws IOException {
int n = len - shortFall;
for (int i = off; i < n; i++)
cbuf[i] = next++;
return n;
}
public boolean ready() {
return true;
}
public void close() throws IOException {
}
}
/**
* Test BufferedReader with an underlying source that always reads
* shortFall fewer characters than requested
*/
static void go(int shortFall) throws Exception {
Reader r = new BufferedReader(new Source(shortFall), 10);
char[] cbuf = new char[8];
int n1 = r.read(cbuf);
int n2 = r.read(cbuf);
System.err.println("Shortfall " + shortFall
+ ": Read " + n1 + ", then " + n2 + " chars");
if (n1 != cbuf.length)
throw new Exception("First read returned " + n1);
if (n2 != cbuf.length)
throw new Exception("Second read returned " + n2);
}
public static void main(String[] args) throws Exception {
for (int i = 0; i < 8; i++) go(i);
}
}
|
