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1 /*
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2 * Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.utilities;
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26
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27 import java.io.*;
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28 import java.util.*;
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29
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30 import sun.jvm.hotspot.debugger.*;
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31
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32 /** A utility class encapsulating useful operations on C strings
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33 represented as Addresses */
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34
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35 public class CStringUtilities {
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36 /** Return the length of a null-terminated ASCII string in the
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37 remote process */
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38 public static int getStringLength(Address addr) {
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39 int i = 0;
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40 while (addr.getCIntegerAt(i, 1, false) != 0) {
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41 i++;
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42 }
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43 return i;
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44 }
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45
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46 private static String encoding = System.getProperty("file.encoding", "US-ASCII");
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47
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48 /** Fetch a null-terminated ASCII string from the remote process.
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49 Returns null if the argument is null, otherwise returns a
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50 non-null string (for example, returns an empty string if the
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51 first character fetched is the null terminator). */
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52 public static String getString(Address addr) {
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53 if (addr == null) {
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54 return null;
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55 }
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56
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57 List data = new ArrayList();
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58 byte val = 0;
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59 long i = 0;
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60 do {
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61 val = (byte) addr.getCIntegerAt(i, 1, false);
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62 if (val != 0) {
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63 data.add(new Byte(val));
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64 }
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65 ++i;
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66 } while (val != 0);
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67
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68 // Convert to byte[] and from there to String
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69 byte[] bytes = new byte[data.size()];
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70 for (i = 0; i < data.size(); ++i) {
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71 bytes[(int) i] = ((Byte) data.get((int) i)).byteValue();
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72 }
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73 // FIXME: When we switch to use JDK 6 to build SA,
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74 // we can change the following to just return:
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75 // return new String(bytes, Charset.defaultCharset());
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76 try {
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77 return new String(bytes, encoding);
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78 } catch (UnsupportedEncodingException e) {
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79 throw new RuntimeException("Error converting bytes to String using " + encoding + " encoding", e);
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80 }
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81 }
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82 }
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