File: gptcl.cc

package info (click to toggle)
gdisk 1.0.5-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 940 kB
  • sloc: cpp: 8,692; sh: 244; makefile: 48
file content (590 lines) | stat: -rw-r--r-- 24,213 bytes parent folder | download
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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
/*
    Implementation of GPTData class derivative with popt-based command
    line processing
    Copyright (C) 2010-2014 Roderick W. Smith

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include <string.h>
#include <string>
#include <iostream>
#include <sstream>
#include <errno.h>
#include <popt.h>
#include "gptcl.h"

GPTDataCL::GPTDataCL(void) {
   attributeOperation = backupFile = partName = hybrids = newPartInfo = NULL;
   mbrParts = twoParts = outDevice = typeCode = partGUID = diskGUID = NULL;
   alignment = DEFAULT_ALIGNMENT;
   deletePartNum = infoPartNum = largestPartNum = bsdPartNum = 0;
   tableSize = GPT_SIZE;
} // GPTDataCL constructor

GPTDataCL::GPTDataCL(string filename) {
} // GPTDataCL constructor with filename

GPTDataCL::~GPTDataCL(void) {
} // GPTDataCL destructor

void GPTDataCL::LoadBackupFile(string backupFile, int &saveData, int &neverSaveData) {
   if (LoadGPTBackup(backupFile) == 1) {
      JustLooking(0);
      saveData = 1;
   } else {
      saveData = 0;
      neverSaveData = 1;
      cerr << "Error loading backup file!\n";
   } // else
} // GPTDataCL::LoadBackupFile()

// Perform the actions specified on the command line. This is necessarily one
// monster of a function!
// Returns values:
// 0 = success
// 1 = too few arguments
// 2 = error when reading partition table
// 3 = non-GPT disk and no -g option
// 4 = unable to save changes
// 8 = disk replication operation (-R) failed
int GPTDataCL::DoOptions(int argc, char* argv[]) {
   GPTData secondDevice;
   int opt, numOptions = 0, saveData = 0, neverSaveData = 0;
   int partNum = 0, newPartNum = -1, saveNonGPT = 1, retval = 0, pretend = 0;
   uint64_t low, high, startSector, endSector, sSize, mainTableLBA;
   uint64_t temp; // temporary variable; free to use in any case
   char *device;
   string cmd, typeGUID, name;
   PartType typeHelper;

   struct poptOption theOptions[] =
   {
      {"attributes", 'A', POPT_ARG_STRING, &attributeOperation, 'A', "operate on partition attributes",
          "list|[partnum:show|or|nand|xor|=|set|clear|toggle|get[:bitnum|hexbitmask]]"},
      {"set-alignment", 'a', POPT_ARG_INT, &alignment, 'a', "set sector alignment", "value"},
      {"backup", 'b', POPT_ARG_STRING, &backupFile, 'b', "backup GPT to file", "file"},
      {"change-name", 'c', POPT_ARG_STRING, &partName, 'c', "change partition's name", "partnum:name"},
      {"recompute-chs", 'C', POPT_ARG_NONE, NULL, 'C', "recompute CHS values in protective/hybrid MBR", ""},
      {"delete", 'd', POPT_ARG_INT, &deletePartNum, 'd', "delete a partition", "partnum"},
      {"display-alignment", 'D', POPT_ARG_NONE, NULL, 'D', "show number of sectors per allocation block", ""},
      {"move-second-header", 'e', POPT_ARG_NONE, NULL, 'e', "move second header to end of disk", ""},
      {"end-of-largest", 'E', POPT_ARG_NONE, NULL, 'E', "show end of largest free block", ""},
      {"first-in-largest", 'f', POPT_ARG_NONE, NULL, 'f', "show start of the largest free block", ""},
      {"first-aligned-in-largest", 'F', POPT_ARG_NONE, NULL, 'F', "show start of the largest free block, aligned", ""},
      {"mbrtogpt", 'g', POPT_ARG_NONE, NULL, 'g', "convert MBR to GPT", ""},
      {"randomize-guids", 'G', POPT_ARG_NONE, NULL, 'G', "randomize disk and partition GUIDs", ""},
      {"hybrid", 'h', POPT_ARG_STRING, &hybrids, 'h', "create hybrid MBR", "partnum[:partnum...][:EE]"},
      {"info", 'i', POPT_ARG_INT, &infoPartNum, 'i', "show detailed information on partition", "partnum"},
      {"move-main-table", 'j', POPT_ARG_INT, &mainTableLBA, 'j', "adjust the location of the main partition table", "sector"},
      {"load-backup", 'l', POPT_ARG_STRING, &backupFile, 'l', "load GPT backup from file", "file"},
      {"list-types", 'L', POPT_ARG_NONE, NULL, 'L', "list known partition types", ""},
      {"gpttombr", 'm', POPT_ARG_STRING, &mbrParts, 'm', "convert GPT to MBR", "partnum[:partnum...]"},
      {"new", 'n', POPT_ARG_STRING, &newPartInfo, 'n', "create new partition", "partnum:start:end"},
      {"largest-new", 'N', POPT_ARG_INT, &largestPartNum, 'N', "create largest possible new partition", "partnum"},
      {"clear", 'o', POPT_ARG_NONE, NULL, 'o', "clear partition table", ""},
      {"print-mbr", 'O', POPT_ARG_NONE, NULL, 'O', "print MBR partition table", ""},
      {"print", 'p', POPT_ARG_NONE, NULL, 'p', "print partition table", ""},
      {"pretend", 'P', POPT_ARG_NONE, NULL, 'P', "make changes in memory, but don't write them", ""},
      {"transpose", 'r', POPT_ARG_STRING, &twoParts, 'r', "transpose two partitions", "partnum:partnum"},
      {"replicate", 'R', POPT_ARG_STRING, &outDevice, 'R', "replicate partition table", "device_filename"},
      {"sort", 's', POPT_ARG_NONE, NULL, 's', "sort partition table entries", ""},
      {"resize-table", 'S', POPT_ARG_INT, &tableSize, 'S', "resize partition table", "numparts"},
      {"typecode", 't', POPT_ARG_STRING, &typeCode, 't', "change partition type code", "partnum:{hexcode|GUID}"},
      {"transform-bsd", 'T', POPT_ARG_INT, &bsdPartNum, 'T', "transform BSD disklabel partition to GPT", "partnum"},
      {"partition-guid", 'u', POPT_ARG_STRING, &partGUID, 'u', "set partition GUID", "partnum:guid"},
      {"disk-guid", 'U', POPT_ARG_STRING, &diskGUID, 'U', "set disk GUID", "guid"},
      {"verify", 'v', POPT_ARG_NONE, NULL, 'v', "check partition table integrity", ""},
      {"version", 'V', POPT_ARG_NONE, NULL, 'V', "display version information", ""},
      {"zap", 'z', POPT_ARG_NONE, NULL, 'z', "zap (destroy) GPT (but not MBR) data structures", ""},
      {"zap-all", 'Z', POPT_ARG_NONE, NULL, 'Z', "zap (destroy) GPT and MBR data structures", ""},
      POPT_AUTOHELP { NULL, 0, 0, NULL, 0 }
   };

   // Create popt context...
   poptCon = poptGetContext(NULL, argc, (const char**) argv, theOptions, 0);

   poptSetOtherOptionHelp(poptCon, " [OPTION...] <device>");

   if (argc < 2) {
      poptPrintUsage(poptCon, stderr, 0);
      return 1;
   }

   // Do one loop through the options to find the device filename and deal
   // with options that don't require a device filename, to flag destructive
   // (o, z, or Z) options, and to flag presence of a --pretend/-P option
   while ((opt = poptGetNextOpt(poptCon)) > 0) {
      switch (opt) {
         case 'A':
            cmd = GetString(attributeOperation, 1);
            if (cmd == "list")
               Attributes::ListAttributes();
            break;
         case 'L':
            typeHelper.ShowAllTypes(0);
            break;
         case 'P':
            pretend = 1;
            break;
         case 'V':
            cout << "GPT fdisk (sgdisk) version " << GPTFDISK_VERSION << "\n\n";
            break;
         default:
            break;
      } // switch
      numOptions++;
   } // while

   // Assume first non-option argument is the device filename....
   device = (char*) poptGetArg(poptCon);
   poptResetContext(poptCon);

   if (device != NULL) {
      JustLooking(); // reset as necessary
      BeQuiet(); // Tell called functions to be less verbose & interactive
      if (LoadPartitions((string) device)) {
         if ((WhichWasUsed() == use_mbr) || (WhichWasUsed() == use_bsd))
            saveNonGPT = 0; // flag so we don't overwrite unless directed to do so
         sSize = GetBlockSize();
         while ((opt = poptGetNextOpt(poptCon)) > 0) {
            switch (opt) {
               case 'A': {
                  if (cmd != "list") {
                     partNum = (int) GetInt(attributeOperation, 1) - 1;
                     if (partNum < 0)
                        partNum = newPartNum;
                     if ((partNum >= 0) && (partNum < (int) GetNumParts())) {
                        switch (ManageAttributes(partNum, GetString(attributeOperation, 2),
                           GetString(attributeOperation, 3))) {
                           case -1:
                              saveData = 0;
                              neverSaveData = 1;
                              break;
                           case 1:
                              JustLooking(0);
                              saveData = 1;
                              break;
                           default:
                              break;
                        } // switch
                     } else {
                        cerr << "Error: Invalid partition number " << partNum + 1 << "\n";
                        saveData = 0;
                        neverSaveData = 1;
                     } // if/else reasonable partition #
                  } // if (cmd != "list")
                  break;
               } // case 'A':
               case 'a':
                  SetAlignment(alignment);
                  break;
               case 'b':
                  SaveGPTBackup(backupFile);
                  free(backupFile);
                  break;
               case 'c':
                  cout << "Setting name!\n";
                  JustLooking(0);
                  partNum = (int) GetInt(partName, 1) - 1;
                  if (partNum < 0)
                     partNum = newPartNum;
                  cout << "partNum is " << partNum << "\n";
                  if ((partNum >= 0) && (partNum < (int) GetNumParts())) {
                     name = GetString(partName, 2);
                     if (SetName(partNum, (UnicodeString) name.c_str())) {
                        saveData = 1;
                     } else {
                        cerr << "Unable to set partition " << partNum + 1
                             << "'s name to '" << GetString(partName, 2) << "'!\n";
                        neverSaveData = 1;
                     } // if/else
                     free(partName);
                  }
                  break;
               case 'C':
                  JustLooking(0);
                  RecomputeCHS();
                  saveData = 1;
                  break;
               case 'd':
                  JustLooking(0);
                  if (DeletePartition(deletePartNum - 1) == 0) {
                     cerr << "Error " << errno << " deleting partition!\n";
                     neverSaveData = 1;
                  } else saveData = 1;
                                                      break;
               case 'D':
                  cout << GetAlignment() << "\n";
                  break;
               case 'e':
                  JustLooking(0);
                  MoveSecondHeaderToEnd();
                  saveData = 1;
                  break;
               case 'E':
                  cout << FindLastInFree(FindFirstInLargest()) << "\n";
                  break;
               case 'f':
                  cout << FindFirstInLargest() << "\n";
                  break;
               case 'F':
                  temp = FindFirstInLargest();
                  Align(&temp);
                  cout << temp << "\n";
                  break;
               case 'g':
                  JustLooking(0);
                  saveData = 1;
                  saveNonGPT = 1;
                  break;
               case 'G':
                  JustLooking(0);
                  saveData = 1;
                  RandomizeGUIDs();
                  break;
               case 'h':
                  JustLooking(0);
                  if (BuildMBR(hybrids, 1) == 1)
                     saveData = 1;
                  break;
               case 'i':
                  ShowPartDetails(infoPartNum - 1);
                  break;
               case 'j':
                   if (MoveMainTable(mainTableLBA)) {
                       JustLooking(0);
                       saveData = 1;
                   } else {
                       neverSaveData = 1;
                   } // if/else
                   break;
               case 'l':
                  LoadBackupFile(backupFile, saveData, neverSaveData);
                  free(backupFile);
                  break;
               case 'L':
                  break;
               case 'm':
                  JustLooking(0);
                  if (BuildMBR(mbrParts, 0) == 1) {
                     if (!pretend) {
                        if (SaveMBR()) {
                           DestroyGPT();
                        } else
                           cerr << "Problem saving MBR!\n";
                     } // if
                     saveNonGPT = 0;
                     pretend = 1; // Not really, but works around problem if -g is used with this...
                     saveData = 0;
                  } // if
                  break;
               case 'n':
                  JustLooking(0);
                  newPartNum = (int) GetInt(newPartInfo, 1) - 1;
                  if (newPartNum < 0)
                     newPartNum = FindFirstFreePart();
                  low = FindFirstInLargest();
                  Align(&low);
                  high = FindLastInFree(low);
                  startSector = IeeeToInt(GetString(newPartInfo, 2), sSize, low, high, low);
                  endSector = IeeeToInt(GetString(newPartInfo, 3), sSize, startSector, high, high);
                  if (CreatePartition(newPartNum, startSector, endSector)) {
                     saveData = 1;
                  } else {
                     cerr << "Could not create partition " << newPartNum + 1 << " from "
                          << startSector << " to " << endSector << "\n";
                     neverSaveData = 1;
                  } // if/else
                  free(newPartInfo);
                  break;
               case 'N':
                  JustLooking(0);
                  startSector = FindFirstInLargest();
                  Align(&startSector);
                  endSector = FindLastInFree(startSector);
                  if (largestPartNum <= 0)
                     largestPartNum = FindFirstFreePart() + 1;
                  if (CreatePartition(largestPartNum - 1, startSector, endSector)) {
                     saveData = 1;
                  } else {
                     cerr << "Could not create partition " << largestPartNum << " from "
                     << startSector << " to " << endSector << "\n";
                     neverSaveData = 1;
                  } // if/else
                  break;
               case 'o':
                  JustLooking(0);
                  ClearGPTData();
                  saveData = 1;
                  break;
               case 'O':
                   DisplayMBRData();
                   break;
               case 'p':
                  DisplayGPTData();
                  break;
               case 'P':
                  pretend = 1;
                  break;
               case 'r':
                  JustLooking(0);
                  uint64_t p1, p2;
                  p1 = GetInt(twoParts, 1) - 1;
                  p2 = GetInt(twoParts, 2) - 1;
                  if (SwapPartitions((uint32_t) p1, (uint32_t) p2) == 0) {
                     neverSaveData = 1;
                     cerr << "Cannot swap partitions " << p1 + 1 << " and " << p2 + 1 << "\n";
                  } else saveData = 1;
                                                      break;
               case 'R':
                  secondDevice = *this;
                  secondDevice.SetDisk(outDevice);
                  secondDevice.JustLooking(0);
                  if (!secondDevice.SaveGPTData(1))
                     retval = 8;
                  break;
               case 's':
                  JustLooking(0);
                  SortGPT();
                  saveData = 1;
                  break;
               case 'S':
                  JustLooking(0);
                  if (SetGPTSize(tableSize) == 0)
                     neverSaveData = 1;
                  else
                     saveData = 1;
                  break;
               case 't':
                  JustLooking(0);
                  partNum = (int) GetInt(typeCode, 1) - 1;
                  if (partNum < 0)
                     partNum = newPartNum;
                  if ((partNum >= 0) && (partNum < (int) GetNumParts())) {
                     typeHelper = GetString(typeCode, 2);
                     if ((typeHelper != PartType::unusedPartType) &&
                         (ChangePartType(partNum, typeHelper))) {
                        saveData = 1;
                        } else {
                           cerr << "Could not change partition " << partNum + 1
                           << "'s type code to " << GetString(typeCode, 2) << "!\n";
                           neverSaveData = 1;
                        } // if/else
                     free(typeCode);
                  }
                  break;
               case 'T':
                  JustLooking(0);
                  XFormDisklabel(bsdPartNum - 1);
                  saveData = 1;
                  break;
               case 'u':
                  JustLooking(0);
                  saveData = 1;
                  partNum = (int) GetInt(partGUID, 1) - 1;
                  if (partNum < 0)
                     partNum = newPartNum;
                  if ((partNum >= 0) && (partNum < (int) GetNumParts())) {
                     SetPartitionGUID(partNum, GetString(partGUID, 2).c_str());
                  }
                  break;
               case 'U':
                  JustLooking(0);
                  saveData = 1;
                  SetDiskGUID(diskGUID);
                  break;
               case 'v':
                  Verify();
                  break;
               case 'z':
                  if (!pretend) {
                     DestroyGPT();
                  } // if
                  saveNonGPT = 1;
                  saveData = 0;
                  break;
               case 'Z':
                  if (!pretend) {
                     DestroyGPT();
                     DestroyMBR();
                  } // if
                  saveNonGPT = 1;
                  saveData = 0;
                  break;
               default:
                  cerr << "Unknown option (-" << opt << ")!\n";
                  break;
               } // switch
         } // while
      } else { // if loaded OK
         poptResetContext(poptCon);
         // Do a few types of operations even if there are problems....
         while ((opt = poptGetNextOpt(poptCon)) > 0) {
            switch (opt) {
               case 'l':
                  LoadBackupFile(backupFile, saveData, neverSaveData);
                  cout << "Information: Loading backup partition table; will override earlier problems!\n";
                  free(backupFile);
                  retval = 0;
                  break;
               case 'o':
                  JustLooking(0);
                  ClearGPTData();
                  saveData = 1;
                  cout << "Information: Creating fresh partition table; will override earlier problems!\n";
                  retval = 0;
                  break;
               case 'v':
                  cout << "Verification may miss some problems or report too many!\n";
                  Verify();
                  break;
               case 'z':
                  if (!pretend) {
                     DestroyGPT();
                  } // if
                  saveNonGPT = 1;
                  saveData = 0;
                  break;
               case 'Z':
                  if (!pretend) {
                     DestroyGPT();
                     DestroyMBR();
                  } // if
                  saveNonGPT = 1;
                  saveData = 0;
                  break;
            } // switch
         } // while
         retval = 2;
      } // if/else loaded OK
      if ((saveData) && (!neverSaveData) && (saveNonGPT) && (!pretend)) {
         if (!SaveGPTData(1))
            retval = 4;
      }
      if (saveData && (!saveNonGPT)) {
         cout << "Non-GPT disk; not saving changes. Use -g to override.\n";
         retval = 3;
      } // if
      if (neverSaveData) {
         cerr << "Error encountered; not saving changes.\n";
         retval = 4;
      } // if
   } // if (device != NULL)
   poptFreeContext(poptCon);
   return retval;
} // GPTDataCL::DoOptions()

// Create a hybrid or regular MBR from GPT data structures
int GPTDataCL::BuildMBR(char* argument, int isHybrid) {
   int numParts, allOK = 1, i, origPartNum;
   int eeLast, mbrNum = 0;
   MBRPart newPart;
   BasicMBRData newMBR;

   if (argument != NULL) {
      numParts = CountColons(argument) + 1;
      if (isHybrid) {
         eeLast = GetString(argument, numParts) == "EE";
         if (eeLast) {
            numParts--;
         }
      }

      if (numParts <= (4 - isHybrid)) {
         newMBR.SetDisk(GetDisk());
         for (i = 0; i < numParts; i++) {
            origPartNum = GetInt(argument, i + 1) - 1;
            if (IsUsedPartNum(origPartNum) && (partitions[origPartNum].IsSizedForMBR() == MBR_SIZED_GOOD)) {
               mbrNum = i + (isHybrid && ! eeLast);
               newPart.SetInclusion(PRIMARY);
               newPart.SetLocation(operator[](origPartNum).GetFirstLBA(),
                                   operator[](origPartNum).GetLengthLBA());
               newPart.SetStatus(0);
               newPart.SetType((uint8_t)(operator[](origPartNum).GetHexType() / 0x0100));
               newMBR.AddPart(mbrNum, newPart);
            } else {
               cerr << "Original partition " << origPartNum + 1 << " does not exist or is too big! Aborting operation!\n";
               allOK = 0;
            } // if/else
         } // for
         if (isHybrid) {
            if (eeLast) {
               mbrNum = i;
            } else {
               mbrNum = 0;
            }
            newPart.SetInclusion(PRIMARY);
            newPart.SetLocation(1, newMBR.FindLastInFree(1));
            newPart.SetStatus(0);
            newPart.SetType(0xEE);
            newMBR.AddPart(mbrNum, newPart);
         } // if
         if (allOK)
            SetProtectiveMBR(newMBR);
      } else allOK = 0;
   } else allOK = 0;
   if (!allOK)
      cerr << "Problem creating MBR!\n";
   return allOK;
} // GPTDataCL::BuildMBR()

// Returns the number of colons in argument string, ignoring the
// first character (thus, a leading colon is ignored, as GetString()
// does).
int CountColons(char* argument) {
   int num = 0;

   while ((argument[0] != '\0') && (argument = strchr(&argument[1], ':')))
      num++;

   return num;
} // GPTDataCL::CountColons()

// Extract integer data from argument string, which should be colon-delimited
uint64_t GetInt(const string & argument, int itemNum) {
   uint64_t retval;

   istringstream inString(GetString(argument, itemNum));
   inString >> retval;
   return retval;
} // GPTDataCL::GetInt()

// Extract string data from argument string, which should be colon-delimited
// If string begins with a colon, that colon is skipped in the counting. If an
// invalid itemNum is specified, returns an empty string.
string GetString(string argument, int itemNum) {
   size_t startPos = 0, endPos = 0;
   string retVal = "";
   int foundLast = 0;
   int numFound = 0;

   if (argument[0] == ':')
      argument.erase(0, 1);
   while ((numFound < itemNum) && (!foundLast)) {
      endPos = argument.find(':', startPos);
      numFound++;
      if (endPos == string::npos) {
         foundLast = 1;
         endPos = argument.length();
      } else if (numFound < itemNum) {
         startPos = endPos + 1;
      } // if/elseif
   } // while
   if ((numFound == itemNum) && (numFound > 0))
      retVal = argument.substr(startPos, endPos - startPos);

   return retVal;
} // GetString()