Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/utilities/CStringUtilities.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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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 } |