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comparison agent/src/share/classes/sun/jvm/hotspot/utilities/CStringUtilities.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.utilities;
26
27 import java.io.*;
28 import java.util.*;
29
30 import sun.jvm.hotspot.debugger.*;
31
32 /** A utility class encapsulating useful operations on C strings
33 represented as Addresses */
34
35 public class CStringUtilities {
36 /** Return the length of a null-terminated ASCII string in the
37 remote process */
38 public static int getStringLength(Address addr) {
39 int i = 0;
40 while (addr.getCIntegerAt(i, 1, false) != 0) {
41 i++;
42 }
43 return i;
44 }
45
46 private static String encoding = System.getProperty("file.encoding", "US-ASCII");
47
48 /** Fetch a null-terminated ASCII string from the remote process.
49 Returns null if the argument is null, otherwise returns a
50 non-null string (for example, returns an empty string if the
51 first character fetched is the null terminator). */
52 public static String getString(Address addr) {
53 if (addr == null) {
54 return null;
55 }
56
57 List data = new ArrayList();
58 byte val = 0;
59 long i = 0;
60 do {
61 val = (byte) addr.getCIntegerAt(i, 1, false);
62 if (val != 0) {
63 data.add(new Byte(val));
64 }
65 ++i;
66 } while (val != 0);
67
68 // Convert to byte[] and from there to String
69 byte[] bytes = new byte[data.size()];
70 for (i = 0; i < data.size(); ++i) {
71 bytes[(int) i] = ((Byte) data.get((int) i)).byteValue();
72 }
73 // FIXME: When we switch to use JDK 6 to build SA,
74 // we can change the following to just return:
75 // return new String(bytes, Charset.defaultCharset());
76 try {
77 return new String(bytes, encoding);
78 } catch (UnsupportedEncodingException e) {
79 throw new RuntimeException("Error converting bytes to String using " + encoding + " encoding", e);
80 }
81 }
82 }