summaryrefslogtreecommitdiffstats
path: root/src/bldprogs/scmstream.cpp
blob: 8fa37da5dd5b28559dfa08297618dde31660919a (plain)
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
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
/* $Id: scmstream.cpp $ */
/** @file
 * IPRT Testcase / Tool - Source Code Massager Stream Code.
 */

/*
 * Copyright (C) 2010-2022 Oracle and/or its affiliates.
 *
 * This file is part of VirtualBox base platform packages, as
 * available from https://www.virtualbox.org.
 *
 * 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, in version 3 of the
 * License.
 *
 * 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, see <https://www.gnu.org/licenses>.
 *
 * SPDX-License-Identifier: GPL-3.0-only
 */


/*********************************************************************************************************************************
*   Header Files                                                                                                                 *
*********************************************************************************************************************************/
#include <iprt/assert.h>
#include <iprt/ctype.h>
#include <iprt/err.h>
#include <iprt/file.h>
#include <iprt/handle.h>
#include <iprt/mem.h>
#include <iprt/pipe.h>
#include <iprt/string.h>

#include "scmstream.h"


/**
 * Initializes the stream structure.
 *
 * @param   pStream             The stream structure.
 * @param   fWriteOrRead        The value of the fWriteOrRead stream member.
 */
static void scmStreamInitInternal(PSCMSTREAM pStream, bool fWriteOrRead)
{
    pStream->pch                = NULL;
    pStream->off                = 0;
    pStream->cb                 = 0;
    pStream->cbAllocated        = 0;

    pStream->paLines            = NULL;
    pStream->iLine              = 0;
    pStream->cLines             = 0;
    pStream->cLinesAllocated    = 0;

    pStream->fWriteOrRead       = fWriteOrRead;
    pStream->fFileMemory        = false;
    pStream->fFullyLineated     = false;

    pStream->rc                 = VINF_SUCCESS;
}

/**
 * Initialize an input stream.
 *
 * @returns IPRT status code.
 * @param   pStream             The stream to initialize.
 * @param   pszFilename         The file to take the stream content from.
 */
int ScmStreamInitForReading(PSCMSTREAM pStream, const char *pszFilename)
{
    scmStreamInitInternal(pStream, false /*fWriteOrRead*/);

    void *pvFile;
    size_t cbFile;
    int rc = pStream->rc = RTFileReadAll(pszFilename, &pvFile, &cbFile);
    if (RT_SUCCESS(rc))
    {
        pStream->pch            = (char *)pvFile;
        pStream->cb             = cbFile;
        pStream->cbAllocated    = cbFile;
        pStream->fFileMemory    = true;
    }
    return rc;
}

/**
 * Initialize an output stream.
 *
 * @returns IPRT status code
 * @param   pStream             The stream to initialize.
 * @param   pRelatedStream      Pointer to a related stream.  NULL is fine.
 */
int ScmStreamInitForWriting(PSCMSTREAM pStream, PCSCMSTREAM pRelatedStream)
{
    scmStreamInitInternal(pStream, true /*fWriteOrRead*/);

    /* allocate stuff */
    size_t cbEstimate = !pRelatedStream ? _64K
                      : pRelatedStream->cb > 0 ? pRelatedStream->cb + pRelatedStream->cb / 10 : 64;
    cbEstimate = RT_ALIGN(cbEstimate, _4K);
    pStream->pch = (char *)RTMemAlloc(cbEstimate);
    if (pStream->pch)
    {
        size_t cLinesEstimate = pRelatedStream && pRelatedStream->fFullyLineated
                              ? pRelatedStream->cLines + pRelatedStream->cLines / 10
                              : cbEstimate / 24;
        cLinesEstimate = RT_ALIGN(cLinesEstimate, 512);
        if (cLinesEstimate == 0)
            cLinesEstimate = 16;
        pStream->paLines = (PSCMSTREAMLINE)RTMemAlloc(cLinesEstimate * sizeof(SCMSTREAMLINE));
        if (pStream->paLines)
        {
            pStream->paLines[0].off     = 0;
            pStream->paLines[0].cch     = 0;
            pStream->paLines[0].enmEol  = SCMEOL_NONE;
            pStream->cbAllocated        = cbEstimate;
            pStream->cLinesAllocated    = cLinesEstimate;
            return VINF_SUCCESS;
        }

        RTMemFree(pStream->pch);
        pStream->pch = NULL;
    }
    return pStream->rc = VERR_NO_MEMORY;
}

/**
 * Frees the resources associated with the stream.
 *
 * Nothing is happens to whatever the stream was initialized from or dumped to.
 *
 * @param   pStream             The stream to delete.
 */
void ScmStreamDelete(PSCMSTREAM pStream)
{
    if (pStream->pch)
    {
        if (pStream->fFileMemory)
            RTFileReadAllFree(pStream->pch, pStream->cbAllocated);
        else
            RTMemFree(pStream->pch);
        pStream->pch = NULL;
    }
    pStream->cbAllocated = 0;

    if (pStream->paLines)
    {
        RTMemFree(pStream->paLines);
        pStream->paLines = NULL;
    }
    pStream->cLinesAllocated = 0;
}

/**
 * Get the stream status code.
 *
 * @returns IPRT status code.
 * @param   pStream             The stream.
 */
int ScmStreamGetStatus(PCSCMSTREAM pStream)
{
    return pStream->rc;
}

/**
 * Grows the buffer of a write stream.
 *
 * @returns IPRT status code.
 * @param   pStream             The stream.  Must be in write mode.
 * @param   cbAppending         The minimum number of bytes to grow the buffer
 *                              with.
 */
static int scmStreamGrowBuffer(PSCMSTREAM pStream, size_t cbAppending)
{
    size_t cbAllocated = pStream->cbAllocated;
    cbAllocated += RT_MAX(0x1000 + cbAppending, cbAllocated);
    cbAllocated = RT_ALIGN(cbAllocated, 0x1000);
    void *pvNew;
    if (!pStream->fFileMemory)
    {
        pvNew = RTMemRealloc(pStream->pch, cbAllocated);
        if (!pvNew)
            return pStream->rc = VERR_NO_MEMORY;
    }
    else
    {
        pvNew = RTMemDupEx(pStream->pch, pStream->off, cbAllocated - pStream->off);
        if (!pvNew)
            return pStream->rc = VERR_NO_MEMORY;
        RTFileReadAllFree(pStream->pch, pStream->cbAllocated);
        pStream->fFileMemory = false;
    }
    pStream->pch = (char *)pvNew;
    pStream->cbAllocated = cbAllocated;

    return VINF_SUCCESS;
}

/**
 * Grows the line array of a stream.
 *
 * @returns IPRT status code.
 * @param   pStream             The stream.
 * @param   iMinLine            Minimum line number.
 */
static int scmStreamGrowLines(PSCMSTREAM pStream, size_t iMinLine)
{
    size_t cLinesAllocated = pStream->cLinesAllocated;
    cLinesAllocated += RT_MAX(512 + iMinLine, cLinesAllocated);
    cLinesAllocated = RT_ALIGN(cLinesAllocated, 512);
    void *pvNew = RTMemRealloc(pStream->paLines, cLinesAllocated * sizeof(SCMSTREAMLINE));
    if (!pvNew)
        return pStream->rc = VERR_NO_MEMORY;

    pStream->paLines = (PSCMSTREAMLINE)pvNew;
    pStream->cLinesAllocated = cLinesAllocated;
    return VINF_SUCCESS;
}

/**
 * Rewinds the stream and sets the mode to read.
 *
 * @param   pStream             The stream.
 */
void ScmStreamRewindForReading(PSCMSTREAM pStream)
{
    pStream->off          = 0;
    pStream->iLine        = 0;
    pStream->fWriteOrRead = false;
    pStream->rc           = VINF_SUCCESS;
}

/**
 * Rewinds the stream and sets the mode to write.
 *
 * @param   pStream             The stream.
 */
void ScmStreamRewindForWriting(PSCMSTREAM pStream)
{
    pStream->off            = 0;
    pStream->iLine          = 0;
    pStream->cLines         = 0;
    pStream->fWriteOrRead   = true;
    pStream->fFullyLineated = true;
    pStream->rc             = VINF_SUCCESS;

    /* Initialize the first line with a zero length so ScmStreamWrite won't misbehave. */
    if (pStream->cLinesAllocated == 0)
        scmStreamGrowLines(pStream, 1);
    if (pStream->cLinesAllocated > 0)
    {
        pStream->paLines[0].off    = 0;
        pStream->paLines[0].cch    = 0;
        pStream->paLines[0].enmEol = SCMEOL_NONE;
    }
}

/**
 * Checks if it's a text stream.
 *
 * Not 100% proof.
 *
 * @returns true if it probably is a text file, false if not.
 * @param   pStream             The stream. Write or read, doesn't matter.
 */
bool ScmStreamIsText(PSCMSTREAM pStream)
{
    if (RTStrEnd(pStream->pch, pStream->cb))
        return false;
    if (!pStream->cb)
        return true;
    return true;
}

/**
 * Performs an integrity check of the stream.
 *
 * @returns IPRT status code.
 * @param   pStream             The stream.
 */
int ScmStreamCheckItegrity(PSCMSTREAM pStream)
{
    /*
     * Perform sanity checks.
     */
    size_t const cbFile = pStream->cb;
    for (size_t iLine = 0; iLine < pStream->cLines; iLine++)
    {
        size_t offEol = pStream->paLines[iLine].off + pStream->paLines[iLine].cch;
        AssertReturn(offEol + pStream->paLines[iLine].enmEol <= cbFile, VERR_INTERNAL_ERROR_2);
        switch (pStream->paLines[iLine].enmEol)
        {
            case SCMEOL_LF:
                AssertReturn(pStream->pch[offEol] == '\n', VERR_INTERNAL_ERROR_3);
                break;
            case SCMEOL_CRLF:
                AssertReturn(pStream->pch[offEol] == '\r', VERR_INTERNAL_ERROR_3);
                AssertReturn(pStream->pch[offEol + 1] == '\n', VERR_INTERNAL_ERROR_3);
                break;
            case SCMEOL_NONE:
                AssertReturn(iLine + 1 >= pStream->cLines, VERR_INTERNAL_ERROR_4);
                break;
            default:
                AssertReturn(iLine + 1 >= pStream->cLines, VERR_INTERNAL_ERROR_5);
        }
    }
    return VINF_SUCCESS;
}

/**
 * Writes the stream to a file.
 *
 * @returns IPRT status code
 * @param   pStream             The stream.
 * @param   pszFilenameFmt      The filename format string.
 * @param   ...                 Format arguments.
 */
int ScmStreamWriteToFile(PSCMSTREAM pStream, const char *pszFilenameFmt, ...)
{
    int rc;

#ifdef RT_STRICT
    /*
     * Check that what we're going to write makes sense first.
     */
    rc = ScmStreamCheckItegrity(pStream);
    if (RT_FAILURE(rc))
        return rc;
#endif

    /*
     * Do the actual writing.
     */
    RTFILE hFile;
    va_list va;
    va_start(va, pszFilenameFmt);
    rc = RTFileOpenV(&hFile, RTFILE_O_WRITE | RTFILE_O_CREATE_REPLACE | RTFILE_O_DENY_WRITE, pszFilenameFmt, va);
    if (RT_SUCCESS(rc))
    {
        rc = RTFileWrite(hFile, pStream->pch, pStream->cb, NULL);
        RTFileClose(hFile);
    }
    va_end(va);
    return rc;
}

/**
 * Writes the stream to standard output.
 *
 * @returns IPRT status code
 * @param   pStream             The stream.
 */
int ScmStreamWriteToStdOut(PSCMSTREAM pStream)
{
    int rc;

#ifdef RT_STRICT
    /*
     * Check that what we're going to write makes sense first.
     */
    rc = ScmStreamCheckItegrity(pStream);
    if (RT_FAILURE(rc))
        return rc;
#endif

    /*
     * Do the actual writing.
     */
    RTHANDLE h;
    rc = RTHandleGetStandard(RTHANDLESTD_OUTPUT, true /*fLeaveOpen*/, &h);
    if (RT_SUCCESS(rc))
    {
        switch (h.enmType)
        {
            case RTHANDLETYPE_FILE:
                rc = RTFileWrite(h.u.hFile, pStream->pch, pStream->cb, NULL);
                /** @todo RTFileClose */
                break;
            case RTHANDLETYPE_PIPE:
                rc = RTPipeWriteBlocking(h.u.hPipe, pStream->pch, pStream->cb, NULL);
                RTPipeClose(h.u.hPipe);
                break;
            default:
                rc = VERR_INVALID_HANDLE;
                break;
        }
    }
    return rc;
}

/**
 * Worker for ScmStreamGetLine that builds the line number index while parsing
 * the stream.
 *
 * @returns Same as SCMStreamGetLine.
 * @param   pStream             The stream.  Must be in read mode.
 * @param   pcchLine            Where to return the line length.
 * @param   penmEol             Where to return the kind of end of line marker.
 */
static const char *scmStreamGetLineInternal(PSCMSTREAM pStream, size_t *pcchLine, PSCMEOL penmEol)
{
    AssertReturn(!pStream->fWriteOrRead, NULL);
    if (RT_FAILURE(pStream->rc))
        return NULL;

    size_t off = pStream->off;
    size_t cb  = pStream->cb;
    if (RT_UNLIKELY(off >= cb))
    {
        pStream->fFullyLineated = true;
        return NULL;
    }

    size_t iLine = pStream->iLine;
    if (RT_UNLIKELY(iLine >= pStream->cLinesAllocated))
    {
        int rc = scmStreamGrowLines(pStream, iLine);
        if (RT_FAILURE(rc))
            return NULL;
    }
    pStream->paLines[iLine].off = off;

    cb -= off;
    const char *pchRet = &pStream->pch[off];
    const char *pch = (const char *)memchr(pchRet, '\n', cb);
    if (RT_LIKELY(pch))
    {
        cb = pch - pchRet;
        pStream->off = off + cb + 1;
        if (   cb < 1
            || pch[-1] != '\r')
            pStream->paLines[iLine].enmEol = *penmEol = SCMEOL_LF;
        else
        {
            pStream->paLines[iLine].enmEol = *penmEol = SCMEOL_CRLF;
            cb--;
        }
    }
    else
    {
        pStream->off = off + cb;
        pStream->paLines[iLine].enmEol = *penmEol = SCMEOL_NONE;
    }
    *pcchLine = cb;
    pStream->paLines[iLine].cch = cb;
    pStream->cLines = pStream->iLine = ++iLine;

    return pchRet;
}

/**
 * Internal worker that delineates a stream.
 *
 * @returns IPRT status code.
 * @param   pStream             The stream.  Caller must check that it is in
 *                              read mode.
 */
static int scmStreamLineate(PSCMSTREAM pStream)
{
    /* Save the stream position. */
    size_t const offSaved   = pStream->off;
    size_t const iLineSaved = pStream->iLine;

    /* Get each line. */
    size_t cchLine;
    SCMEOL enmEol;
    while (scmStreamGetLineInternal(pStream, &cchLine, &enmEol))
        /* nothing */;
    Assert(RT_FAILURE(pStream->rc) || pStream->fFullyLineated);

    /* Restore the position */
    pStream->off   = offSaved;
    pStream->iLine = iLineSaved;

    return pStream->rc;
}

/**
 * Get the current stream position as an byte offset.
 *
 * @returns The current byte offset
 * @param   pStream             The stream.
 */
size_t ScmStreamTell(PSCMSTREAM pStream)
{
    return pStream->off;
}

/**
 * Get the current stream position as a line number.
 *
 * @returns The current line (0-based).
 * @param   pStream             The stream.
 */
size_t ScmStreamTellLine(PSCMSTREAM pStream)
{
    return pStream->iLine;
}


/**
 * Gets the stream offset of a given line.
 *
 * @returns The offset of the line, or the stream size if the line number is too
 *          high.
 * @param   pStream             The stream. Must be in read mode.
 * @param   iLine               The line we're asking about.
 */
size_t ScmStreamTellOffsetOfLine(PSCMSTREAM pStream, size_t iLine)
{
    AssertReturn(!pStream->fWriteOrRead, pStream->cb);
    if (!pStream->fFullyLineated)
    {
        int rc = scmStreamLineate(pStream);
        AssertRCReturn(rc, pStream->cb);
    }
    if (iLine >= pStream->cLines)
        return pStream->cb;
    return pStream->paLines[iLine].off;
}


/**
 * Get the current stream size in bytes.
 *
 * @returns Count of bytes.
 * @param   pStream             The stream.
 */
size_t ScmStreamSize(PSCMSTREAM pStream)
{
    return pStream->cb;
}

/**
 * Gets the number of lines in the stream.
 *
 * @returns The number of lines.
 * @param   pStream             The stream.
 */
size_t ScmStreamCountLines(PSCMSTREAM pStream)
{
    if (!pStream->fFullyLineated)
        scmStreamLineate(pStream);
    return pStream->cLines;
}

/**
 * Seeks to a given byte offset in the stream.
 *
 * @returns IPRT status code.
 * @retval  VERR_SEEK if the new stream position is the middle of an EOL marker.
 *          This is a temporary restriction.
 *
 * @param   pStream             The stream.  Must be in read mode.
 * @param   offAbsolute         The offset to seek to.  If this is beyond the
 *                              end of the stream, the position is set to the
 *                              end.
 */
int ScmStreamSeekAbsolute(PSCMSTREAM pStream, size_t offAbsolute)
{
    AssertReturn(!pStream->fWriteOrRead, VERR_ACCESS_DENIED);
    if (RT_FAILURE(pStream->rc))
        return pStream->rc;

    /* Must be fully delineated. (lazy bird) */
    if (RT_UNLIKELY(!pStream->fFullyLineated))
    {
        int rc = scmStreamLineate(pStream);
        if (RT_FAILURE(rc))
            return rc;
    }

    /* Ok, do the job. */
    if (offAbsolute < pStream->cb)
    {
        /** @todo Should do a binary search here, but I'm too darn lazy tonight. */
        pStream->off = ~(size_t)0;
        for (size_t i = 0; i < pStream->cLines; i++)
        {
            if (offAbsolute < pStream->paLines[i].off + pStream->paLines[i].cch + pStream->paLines[i].enmEol)
            {
                pStream->off   = offAbsolute;
                pStream->iLine = i;
                if (offAbsolute > pStream->paLines[i].off + pStream->paLines[i].cch)
                    return pStream->rc = VERR_SEEK;
                break;
            }
        }
        AssertReturn(pStream->off != ~(size_t)0, pStream->rc = VERR_INTERNAL_ERROR_3);
    }
    else
    {
        pStream->off   = pStream->cb;
        pStream->iLine = pStream->cLines;
    }
    return VINF_SUCCESS;
}


/**
 * Seeks a number of bytes relative to the current stream position.
 *
 * @returns IPRT status code.
 * @retval  VERR_SEEK if the new stream position is the middle of an EOL marker.
 *          This is a temporary restriction.
 *
 * @param   pStream             The stream.  Must be in read mode.
 * @param   offRelative         The offset to seek to.  A negative offset
 *                              rewinds and positive one fast forwards the
 *                              stream.  Will quietly stop at the beginning and
 *                              end of the stream.
 */
int ScmStreamSeekRelative(PSCMSTREAM pStream, ssize_t offRelative)
{
    size_t offAbsolute;
    if (offRelative >= 0)
        offAbsolute = pStream->off + offRelative;
    else if ((size_t)-offRelative <= pStream->off)
        offAbsolute = pStream->off + offRelative;
    else
        offAbsolute = 0;
    return ScmStreamSeekAbsolute(pStream, offAbsolute);
}

/**
 * Seeks to a given line in the stream.
 *
 * @returns IPRT status code.
 *
 * @param   pStream             The stream.  Must be in read mode.
 * @param   iLine               The line to seek to.  If this is beyond the end
 *                              of the stream, the position is set to the end.
 */
int ScmStreamSeekByLine(PSCMSTREAM pStream, size_t iLine)
{
    if (RT_FAILURE(pStream->rc))
        return pStream->rc;

    /* Must be fully delineated. (lazy bird) */
    if (RT_UNLIKELY(!pStream->fFullyLineated))
    {
        AssertReturn(!pStream->fWriteOrRead, VERR_ACCESS_DENIED);
        int rc = scmStreamLineate(pStream);
        if (RT_FAILURE(rc))
            return rc;
    }

    /* Ok, do the job. */
    if (iLine < pStream->cLines)
    {
        pStream->iLine = iLine;
        pStream->off   = pStream->paLines[iLine].off;
        if (pStream->fWriteOrRead)
        {
            pStream->cb     = pStream->paLines[iLine].off;
            pStream->cLines = iLine;
            pStream->paLines[iLine].cch    = 0;
            pStream->paLines[iLine].enmEol = SCMEOL_NONE;
        }
    }
    else
    {
        AssertReturn(!pStream->fWriteOrRead, VERR_ACCESS_DENIED);
        pStream->off   = pStream->cb;
        pStream->iLine = pStream->cLines;
    }
    return VINF_SUCCESS;
}

/**
 * Checks if the stream position is at the start of a line.
 *
 * @returns @c true if at the start, @c false if not.
 * @param   pStream             The stream.
 */
bool ScmStreamIsAtStartOfLine(PSCMSTREAM pStream)
{
    if (   !pStream->fFullyLineated
        && !pStream->fWriteOrRead)
    {
        int rc = scmStreamLineate(pStream);
        if (RT_FAILURE(rc))
            return false;
    }
    return pStream->off == pStream->paLines[pStream->iLine].off;
}

/**
 * Worker for ScmStreamGetLineByNo and ScmStreamGetLine.
 *
 * Works on a fully lineated stream.
 *
 * @returns Pointer to the first character in the line, not NULL terminated.
 *          NULL if the end of the stream has been reached or some problem
 *          occurred.
 *
 * @param   pStream             The stream.  Must be in read mode.
 * @param   iLine               The line to get (0-based).
 * @param   pcchLine            The length.
 * @param   penmEol             Where to return the end of line type indicator.
 */
DECLINLINE(const char *) scmStreamGetLineByNoCommon(PSCMSTREAM pStream, size_t iLine, size_t *pcchLine, PSCMEOL penmEol)
{
    Assert(!pStream->fWriteOrRead);
    Assert(pStream->fFullyLineated);

    /* Check stream status. */
    if (RT_SUCCESS(pStream->rc))
    {
        /* Not at the end of the stream yet? */
        if (RT_LIKELY(iLine < pStream->cLines))
        {
            /* Get the data. */
            const char *pchRet = &pStream->pch[pStream->paLines[iLine].off];
            *pcchLine          = pStream->paLines[iLine].cch;
            *penmEol           = pStream->paLines[iLine].enmEol;

            /* update the stream position. */
            pStream->off       = pStream->paLines[iLine].off + pStream->paLines[iLine].cch + pStream->paLines[iLine].enmEol;
            pStream->iLine     = iLine + 1;
            return pchRet;
        }
        pStream->off   = pStream->cb;
        pStream->iLine = pStream->cLines;
    }
    *pcchLine = 0;
    *penmEol  = SCMEOL_NONE;
    return NULL;
}


/**
 * Get a numbered line from the stream (changes the position).
 *
 * A line is always delimited by a LF character or the end of the stream.  The
 * delimiter is not included in returned line length, but instead returned via
 * the @a penmEol indicator.
 *
 * @returns Pointer to the first character in the line, not NULL terminated.
 *          NULL if the end of the stream has been reached or some problem
 *          occurred (*pcchLine set to zero and *penmEol to SCMEOL_NONE).
 *
 * @param   pStream             The stream.  Must be in read mode.
 * @param   iLine               The line to get (0-based).
 * @param   pcchLine            The length.
 * @param   penmEol             Where to return the end of line type indicator.
 */
const char *ScmStreamGetLineByNo(PSCMSTREAM pStream, size_t iLine, size_t *pcchLine, PSCMEOL penmEol)
{
    AssertReturn(!pStream->fWriteOrRead, NULL);

    /* Make sure it's fully delineated so we can use the index. */
    if (RT_LIKELY(pStream->fFullyLineated))
        return scmStreamGetLineByNoCommon(pStream, iLine, pcchLine, penmEol);

    int rc = pStream->rc;
    if (RT_SUCCESS(rc))
    {
        rc = scmStreamLineate(pStream);
        if (RT_SUCCESS(rc))
            return scmStreamGetLineByNoCommon(pStream, iLine, pcchLine, penmEol);
    }

    *pcchLine = 0;
    *penmEol  = SCMEOL_NONE;
    return NULL;
}

/**
 * Get a line from the stream.
 *
 * A line is always delimited by a LF character or the end of the stream.  The
 * delimiter is not included in returned line length, but instead returned via
 * the @a penmEol indicator.
 *
 * @returns Pointer to the first character in the line, not NULL terminated.
 *          NULL if the end of the stream has been reached or some problem
 *          occurred (*pcchLine set to zero and *penmEol to SCMEOL_NONE).
 *
 * @param   pStream             The stream.  Must be in read mode.
 * @param   pcchLine            The length.
 * @param   penmEol             Where to return the end of line type indicator.
 */
const char *ScmStreamGetLine(PSCMSTREAM pStream, size_t *pcchLine, PSCMEOL penmEol)
{
    if (RT_LIKELY(pStream->fFullyLineated))
    {
        size_t      offCur   = pStream->off;
        size_t      iCurLine = pStream->iLine;
        const char *pszLine  = scmStreamGetLineByNoCommon(pStream, iCurLine, pcchLine, penmEol);
        if (   pszLine
            && offCur > pStream->paLines[iCurLine].off)
        {
            offCur -= pStream->paLines[iCurLine].off;
            Assert(offCur <= pStream->paLines[iCurLine].cch + pStream->paLines[iCurLine].enmEol);
            if (offCur < pStream->paLines[iCurLine].cch)
                *pcchLine  -= offCur;
            else
                *pcchLine   = 0;
            pszLine        += offCur;
        }
        return pszLine;
    }
    return scmStreamGetLineInternal(pStream, pcchLine, penmEol);
}

/**
 * Get the current buffer pointer.
 *
 * @returns Buffer pointer on success, NULL on failure (asserted).
 * @param   pStream             The stream.  Must be in read mode.
 */
const char *ScmStreamGetCur(PSCMSTREAM pStream)
{
    AssertReturn(!pStream->fWriteOrRead, NULL);
    return pStream->pch + pStream->off;
}

/**
 * Gets a character from the stream.
 *
 * @returns The next unsigned character in the stream.
 *          ~(unsigned)0 on failure.
 * @param   pStream             The stream.  Must be in read mode.
 */
unsigned ScmStreamGetCh(PSCMSTREAM pStream)
{
    /* Check stream state. */
    AssertReturn(!pStream->fWriteOrRead, ~(unsigned)0);
    if (RT_FAILURE(pStream->rc))
        return ~(unsigned)0;
    if (RT_UNLIKELY(!pStream->fFullyLineated))
    {
        int rc = scmStreamLineate(pStream);
        if (RT_FAILURE(rc))
            return ~(unsigned)0;
    }

    /* If there isn't enough stream left, fail already. */
    if (RT_UNLIKELY(pStream->off >= pStream->cb))
        return ~(unsigned)0;

    /* Read a character. */
    char ch = pStream->pch[pStream->off++];

    /* Advance the line indicator. */
    size_t iLine = pStream->iLine;
    if (pStream->off >= pStream->paLines[iLine].off + pStream->paLines[iLine].cch + pStream->paLines[iLine].enmEol)
        pStream->iLine++;

    return (unsigned)ch;
}


/**
 * Peeks at the next character from the stream.
 *
 * @returns The next unsigned character in the stream.
 *          ~(unsigned)0 on failure.
 * @param   pStream             The stream.  Must be in read mode.
 */
unsigned ScmStreamPeekCh(PSCMSTREAM pStream)
{
    /* Check stream state. */
    AssertReturn(!pStream->fWriteOrRead, ~(unsigned)0);
    if (RT_FAILURE(pStream->rc))
        return ~(unsigned)0;
    if (RT_UNLIKELY(!pStream->fFullyLineated))
    {
        int rc = scmStreamLineate(pStream);
        if (RT_FAILURE(rc))
            return ~(unsigned)0;
    }

    /* If there isn't enough stream left, fail already. */
    if (RT_UNLIKELY(pStream->off >= pStream->cb))
        return ~(unsigned)0;

    /* Peek at the next character. */
    char ch = pStream->pch[pStream->off];
    return (unsigned)ch;
}


/**
 * Reads @a cbToRead bytes into @a pvBuf.
 *
 * Will fail if end of stream is encountered before the entire read has been
 * completed.
 *
 * @returns IPRT status code.
 * @retval  VERR_EOF if there isn't @a cbToRead bytes left to read.  Stream
 *          position will be unchanged.
 *
 * @param   pStream             The stream.  Must be in read mode.
 * @param   pvBuf               The buffer to read into.
 * @param   cbToRead            The number of bytes to read.
 */
int ScmStreamRead(PSCMSTREAM pStream, void *pvBuf, size_t cbToRead)
{
    AssertReturn(!pStream->fWriteOrRead, VERR_PERMISSION_DENIED);
    if (RT_FAILURE(pStream->rc))
        return pStream->rc;

    /* If there isn't enough stream left, fail already. */
    if (RT_UNLIKELY(pStream->cb - pStream->off < cbToRead))
        return VERR_EOF;

    /* Copy the data and simply seek to the new stream position. */
    memcpy(pvBuf, &pStream->pch[pStream->off], cbToRead);
    return ScmStreamSeekAbsolute(pStream, pStream->off + cbToRead);
}


/**
 * Checks if the given line is empty or full of white space.
 *
 * @returns true if white space only, false if not (or if non-existant).
 * @param   pStream             The stream.  Must be in read mode.
 * @param   iLine               The line in question.
 */
bool ScmStreamIsWhiteLine(PSCMSTREAM pStream, size_t iLine)
{
    SCMEOL      enmEol;
    size_t      cchLine;
    const char *pchLine = ScmStreamGetLineByNo(pStream, iLine, &cchLine, &enmEol);
    if (!pchLine)
        return false;
    while (cchLine && RT_C_IS_SPACE(*pchLine))
        pchLine++, cchLine--;
    return cchLine == 0;
}


/**
 * Try figure out the end of line style of the give stream.
 *
 * @returns Most likely end of line style.
 * @param   pStream             The stream.
 */
SCMEOL ScmStreamGetEol(PSCMSTREAM pStream)
{
    SCMEOL enmEol;
    if (pStream->cLines > 0)
        enmEol = pStream->paLines[0].enmEol;
    else if (pStream->cb == 0)
        enmEol = SCMEOL_NONE;
    else
    {
        const char *pchLF = (const char *)memchr(pStream->pch, '\n', pStream->cb);
        if (pchLF && pchLF != pStream->pch && pchLF[-1] == '\r')
            enmEol = SCMEOL_CRLF;
        else
            enmEol = SCMEOL_LF;
    }

    if (enmEol == SCMEOL_NONE)
#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
        enmEol = SCMEOL_CRLF;
#else
        enmEol = SCMEOL_LF;
#endif
    return enmEol;
}


/**
 * Get the end of line indicator type for a line.
 *
 * @returns The EOL indicator.  If the line isn't found, the default EOL
 *          indicator is return.
 * @param   pStream             The stream.
 * @param   iLine               The line (0-base).
 */
SCMEOL ScmStreamGetEolByLine(PSCMSTREAM pStream, size_t iLine)
{
    SCMEOL enmEol;
    if (iLine < pStream->cLines)
        enmEol = pStream->paLines[iLine].enmEol;
    else
#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
        enmEol = SCMEOL_CRLF;
#else
        enmEol = SCMEOL_LF;
#endif
    return enmEol;
}


/**
 * Appends a line to the stream.
 *
 * @returns IPRT status code.
 * @param   pStream             The stream.  Must be in write mode.
 * @param   pchLine             Pointer to the line.
 * @param   cchLine             Line length.
 * @param   enmEol              Which end of line indicator to use.
 */
int ScmStreamPutLine(PSCMSTREAM pStream, const char *pchLine, size_t cchLine, SCMEOL enmEol)
{
    AssertReturn(pStream->fWriteOrRead, VERR_ACCESS_DENIED);
    if (RT_FAILURE(pStream->rc))
        return pStream->rc;

    /*
     * Make sure the previous line has a new-line indicator.
     */
    size_t off   = pStream->off;
    size_t iLine = pStream->iLine;
    if (RT_UNLIKELY(   iLine != 0
                    && pStream->paLines[iLine - 1].enmEol == SCMEOL_NONE))
    {
        AssertReturn(pStream->paLines[iLine].cch == 0, VERR_INTERNAL_ERROR_3);
        SCMEOL enmEol2 = enmEol != SCMEOL_NONE ? enmEol : ScmStreamGetEol(pStream);
        if (RT_UNLIKELY(off + cchLine + enmEol + enmEol2 > pStream->cbAllocated))
        {
            int rc = scmStreamGrowBuffer(pStream, cchLine + enmEol + enmEol2);
            if (RT_FAILURE(rc))
                return rc;
        }
        if (enmEol2 == SCMEOL_LF)
            pStream->pch[off++] = '\n';
        else
        {
            pStream->pch[off++] = '\r';
            pStream->pch[off++] = '\n';
        }
        pStream->paLines[iLine - 1].enmEol = enmEol2;
        pStream->paLines[iLine].off = off;
        pStream->off = off;
        pStream->cb  = off;
    }

    /*
     * Ensure we've got sufficient buffer space.
     */
    if (RT_UNLIKELY(off + cchLine + enmEol > pStream->cbAllocated))
    {
        int rc = scmStreamGrowBuffer(pStream, cchLine + enmEol);
        if (RT_FAILURE(rc))
            return rc;
    }

    /*
     * Add a line record.
     */
    if (RT_UNLIKELY(iLine + 1 >= pStream->cLinesAllocated))
    {
        int rc = scmStreamGrowLines(pStream, iLine);
        if (RT_FAILURE(rc))
            return rc;
    }

    pStream->paLines[iLine].cch    = off - pStream->paLines[iLine].off + cchLine;
    pStream->paLines[iLine].enmEol = enmEol;

    iLine++;
    pStream->cLines = iLine;
    pStream->iLine  = iLine;

    /*
     * Copy the line
     */
    memcpy(&pStream->pch[off], pchLine, cchLine);
    off += cchLine;
    if (enmEol == SCMEOL_LF)
        pStream->pch[off++] = '\n';
    else if (enmEol == SCMEOL_CRLF)
    {
        pStream->pch[off++] = '\r';
        pStream->pch[off++] = '\n';
    }
    pStream->off = off;
    pStream->cb  = off;

    /*
     * Start a new line.
     */
    pStream->paLines[iLine].off    = off;
    pStream->paLines[iLine].cch    = 0;
    pStream->paLines[iLine].enmEol = SCMEOL_NONE;

    return VINF_SUCCESS;
}

/**
 * Writes to the stream.
 *
 * @returns IPRT status code
 * @param   pStream             The stream.  Must be in write mode.
 * @param   pchBuf              What to write.
 * @param   cchBuf              How much to write.
 */
int ScmStreamWrite(PSCMSTREAM pStream, const char *pchBuf, size_t cchBuf)
{
    AssertReturn(pStream->fWriteOrRead, VERR_ACCESS_DENIED);
    if (RT_FAILURE(pStream->rc))
        return pStream->rc;

    /*
     * Ensure we've got sufficient buffer space.
     */
    size_t off = pStream->off;
    if (RT_UNLIKELY(off + cchBuf > pStream->cbAllocated))
    {
        int rc = scmStreamGrowBuffer(pStream, cchBuf);
        if (RT_FAILURE(rc))
            return rc;
    }

    /*
     * Deal with the odd case where we've already pushed a line with SCMEOL_NONE.
     */
    size_t iLine = pStream->iLine;
    if (RT_UNLIKELY(   iLine > 0
                    && pStream->paLines[iLine - 1].enmEol == SCMEOL_NONE))
    {
        iLine--;
        pStream->cLines = iLine;
        pStream->iLine  = iLine;
    }

    /*
     * Deal with lines.
     */
    const char *pchLF = (const char *)memchr(pchBuf, '\n', cchBuf);
    if (!pchLF)
        pStream->paLines[iLine].cch += cchBuf;
    else
    {
        const char *pchLine = pchBuf;
        for (;;)
        {
            if (RT_UNLIKELY(iLine + 1 >= pStream->cLinesAllocated))
            {
                int rc = scmStreamGrowLines(pStream, iLine);
                if (RT_FAILURE(rc))
                {
                    iLine = pStream->iLine;
                    pStream->paLines[iLine].cch    = off - pStream->paLines[iLine].off;
                    pStream->paLines[iLine].enmEol = SCMEOL_NONE;
                    return rc;
                }
            }

            size_t cchLine = pchLF - pchLine;
            if (   cchLine
                ?  pchLF[-1] != '\r'
                :     !pStream->paLines[iLine].cch
                   || pStream->pch[pStream->paLines[iLine].off + pStream->paLines[iLine].cch - 1] != '\r')
                pStream->paLines[iLine].enmEol = SCMEOL_LF;
            else
            {
                pStream->paLines[iLine].enmEol = SCMEOL_CRLF;
                cchLine--;
            }
            pStream->paLines[iLine].cch += cchLine;

            iLine++;
            size_t offBuf = pchLF + 1 - pchBuf;
            pStream->paLines[iLine].off    = off + offBuf;
            pStream->paLines[iLine].cch    = 0;
            pStream->paLines[iLine].enmEol = SCMEOL_NONE;

            size_t cchLeft = cchBuf - offBuf;
            pchLine = pchLF + 1;
            pchLF = (const char *)memchr(pchLine, '\n', cchLeft);
            if (!pchLF)
            {
                pStream->paLines[iLine].cch = cchLeft;
                break;
            }
        }

        pStream->iLine  = iLine;
        pStream->cLines = iLine;
    }

    /*
     * Copy the data and update position and size.
     */
    memcpy(&pStream->pch[off], pchBuf, cchBuf);
    off += cchBuf;
    pStream->off = off;
    pStream->cb  = off;

    return VINF_SUCCESS;
}

/**
 * Write a character to the stream.
 *
 * @returns IPRT status code
 * @param   pStream             The stream.  Must be in write mode.
 * @param   pchBuf              What to write.
 * @param   cchBuf              How much to write.
 */
int ScmStreamPutCh(PSCMSTREAM pStream, char ch)
{
    AssertReturn(pStream->fWriteOrRead, VERR_ACCESS_DENIED);
    if (RT_FAILURE(pStream->rc))
        return pStream->rc;

    /*
     * Only deal with the simple cases here, use ScmStreamWrite for the
     * annoying stuff.
     */
    size_t off = pStream->off;
    if (   ch == '\n'
        || RT_UNLIKELY(off + 1 > pStream->cbAllocated))
        return ScmStreamWrite(pStream, &ch, 1);

    /*
     * Just append it.
     */
    pStream->pch[off] = ch;
    pStream->off = off + 1;
    pStream->paLines[pStream->iLine].cch++;

    return VINF_SUCCESS;
}

/**
 * Puts an EOL marker to the stream.
 *
 * @returns IPRt status code.
 * @param   pStream             The stream.  Must be in write mode.
 * @param   enmEol              The end-of-line marker to write.
 */
int ScmStreamPutEol(PSCMSTREAM pStream, SCMEOL enmEol)
{
    if (enmEol == SCMEOL_LF)
        return ScmStreamWrite(pStream, "\n", 1);
    if (enmEol == SCMEOL_CRLF)
        return ScmStreamWrite(pStream, "\r\n", 2);
    if (enmEol == SCMEOL_NONE)
        return VINF_SUCCESS;
    AssertFailedReturn(VERR_INVALID_PARAMETER);
}

/**
 * Formats a string and writes it to the SCM stream.
 *
 * @returns The number of bytes written (>= 0). Negative value are IPRT error
 *          status codes.
 * @param   pStream             The stream to write to.
 * @param   pszFormat           The format string.
 * @param   va                  The arguments to format.
 */
ssize_t ScmStreamPrintfV(PSCMSTREAM pStream, const char *pszFormat, va_list va)
{
    char   *psz;
    ssize_t cch = RTStrAPrintfV(&psz, pszFormat, va);
    if (cch)
    {
        int rc = ScmStreamWrite(pStream, psz, cch);
        RTStrFree(psz);
        if (RT_FAILURE(rc))
            cch = rc;
    }
    return cch;
}

/**
 * Formats a string and writes it to the SCM stream.
 *
 * @returns The number of bytes written (>= 0). Negative value are IPRT error
 *          status codes.
 * @param   pStream             The stream to write to.
 * @param   pszFormat           The format string.
 * @param   ...                 The arguments to format.
 */
ssize_t ScmStreamPrintf(PSCMSTREAM pStream, const char *pszFormat, ...)
{
    va_list va;
    va_start(va, pszFormat);
    ssize_t cch = ScmStreamPrintfV(pStream, pszFormat, va);
    va_end(va);
    return cch;
}

/**
 * Copies @a cLines from the @a pSrc stream onto the @a pDst stream.
 *
 * The stream positions will be used and changed in both streams.
 *
 * @returns IPRT status code.
 * @param   pDst                The destination stream.  Must be in write mode.
 * @param   cLines              The number of lines.  (0 is accepted.)
 * @param   pSrc                The source stream.  Must be in read mode.
 */
int ScmStreamCopyLines(PSCMSTREAM pDst, PSCMSTREAM pSrc, size_t cLines)
{
    AssertReturn(pDst->fWriteOrRead, VERR_ACCESS_DENIED);
    if (RT_FAILURE(pDst->rc))
        return pDst->rc;

    AssertReturn(!pSrc->fWriteOrRead, VERR_ACCESS_DENIED);
    if (RT_FAILURE(pSrc->rc))
        return pSrc->rc;

    while (cLines-- > 0)
    {
        SCMEOL      enmEol;
        size_t      cchLine;
        const char *pchLine = ScmStreamGetLine(pSrc, &cchLine, &enmEol);
        if (!pchLine)
            return pDst->rc = RT_FAILURE(pSrc->rc) ? pSrc->rc : VERR_EOF;

        int rc = ScmStreamPutLine(pDst, pchLine, cchLine, enmEol);
        if (RT_FAILURE(rc))
            return rc;
    }

    return VINF_SUCCESS;
}


/**
 * If the given C word is at off - 1, return @c true and skip beyond it,
 * otherwise return @c false.
 *
 * @retval  true if the given C-word is at the current position minus one char.
 *          The stream position changes.
 * @retval  false if not. The stream position is unchanged.
 *
 * @param   pStream             The stream.
 * @param   cchWord             The length of the word.
 * @param   pszWord             The word.
 */
bool ScmStreamCMatchingWordM1(PSCMSTREAM pStream, const char *pszWord, size_t cchWord)
{
    /* Check stream state. */
    AssertReturn(!pStream->fWriteOrRead, false);
    AssertReturn(RT_SUCCESS(pStream->rc), false);
    AssertReturn(pStream->fFullyLineated, false);

    /* Sufficient chars left on the line? */
    size_t const    iLine   = pStream->iLine;
    AssertReturn(pStream->off > pStream->paLines[iLine].off, false);
    size_t const    cchLeft = pStream->paLines[iLine].cch + pStream->paLines[iLine].off - (pStream->off - 1);
    if (cchWord > cchLeft)
        return false;

    /* Do they match? */
    const char     *psz     = &pStream->pch[pStream->off - 1];
    if (memcmp(psz, pszWord, cchWord))
        return false;

    /* Is it the end of a C word? */
    if (cchWord < cchLeft)
    {
        psz += cchWord;
        if (RT_C_IS_ALNUM(*psz) || *psz == '_')
            return false;
    }

    /* Skip ahead. */
    pStream->off += cchWord - 1;
    return true;
}


/**
 * Get's the C word starting at the current position.
 *
 * @returns Pointer to the word on success and the stream position advanced to
 *          the end of it.
 *          NULL on failure, stream position normally unchanged.
 * @param   pStream             The stream to get the C word from.
 * @param   pcchWord            Where to return the word length.
 */
const char *ScmStreamCGetWord(PSCMSTREAM pStream, size_t *pcchWord)
{
    /* Check stream state. */
    AssertReturn(!pStream->fWriteOrRead, NULL);
    AssertReturn(RT_SUCCESS(pStream->rc), NULL);
    AssertReturn(pStream->fFullyLineated, NULL);

    /* Get the number of chars left on the line and locate the current char. */
    size_t const    iLine   = pStream->iLine;
    size_t const    cchLeft = pStream->paLines[iLine].cch + pStream->paLines[iLine].off - pStream->off;
    const char     *psz     = &pStream->pch[pStream->off];

    /* Is it a leading C character. */
    if (!RT_C_IS_ALPHA(*psz) && *psz != '_')
        return NULL;

    /* Find the end of the word. */
    char    ch;
    size_t  off = 1;
    while (     off < cchLeft
           &&  (   (ch = psz[off]) == '_'
                || RT_C_IS_ALNUM(ch)))
        off++;

    pStream->off += off;
    *pcchWord = off;
    return psz;
}


/**
 * Get's the C word starting at the current position minus one.
 *
 * @returns Pointer to the word on success and the stream position advanced to
 *          the end of it.
 *          NULL on failure, stream position normally unchanged.
 * @param   pStream             The stream to get the C word from.
 * @param   pcchWord            Where to return the word length.
 */
const char *ScmStreamCGetWordM1(PSCMSTREAM pStream, size_t *pcchWord)
{
    /* Check stream state. */
    AssertReturn(!pStream->fWriteOrRead, NULL);
    AssertReturn(RT_SUCCESS(pStream->rc), NULL);
    AssertReturn(pStream->fFullyLineated, NULL);

    /* Get the number of chars left on the line and locate the current char. */
    size_t const    iLine   = pStream->iLine;
    size_t const    cchLeft = pStream->paLines[iLine].cch + pStream->paLines[iLine].off - (pStream->off - 1);
    const char     *psz     = &pStream->pch[pStream->off - 1];

    /* Is it a leading C character. */
    if (!RT_C_IS_ALPHA(*psz) && *psz != '_')
        return NULL;

    /* Find the end of the word. */
    char    ch;
    size_t  off = 1;
    while (     off < cchLeft
           &&  (   (ch = psz[off]) == '_'
                || RT_C_IS_ALNUM(ch)))
        off++;

    pStream->off += off - 1;
    *pcchWord = off;
    return psz;
}