forked from lipro-cpm4l/cpmtools
-
Notifications
You must be signed in to change notification settings - Fork 1
/
device_win32.c
670 lines (584 loc) · 20.2 KB
/
device_win32.c
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
/* #includes */ /*{{{C}}}*//*{{{*/
#include "config.h"
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include "cpmdir.h"
#include "cpmfs.h"
#ifdef USE_DMALLOC
#include <dmalloc.h>
#endif
/*}}}*/
/* types */ /*{{{*/
#define PHYSICAL_SECTOR_1 1 /* First physical sector */
/* Use the INT13 interface rather than INT25/INT26. This appears to
* improve performance, but is less well tested. */
#define USE_INT13
/* Windows 95 disk I/O functions - based on Stan Mitchell's DISKDUMP.C */
#define VWIN32_DIOC_DOS_IOCTL 1 /* DOS ioctl calls 4400h-4411h */
#define VWIN32_DIOC_DOS_INT25 2 /* absolute disk read, DOS int 25h */
#define VWIN32_DIOC_DOS_INT26 3 /* absolute disk write, DOS int 26h */
#define VWIN32_DIOC_DOS_INT13 4 /* BIOS INT13 functions */
typedef struct _DIOC_REGISTERS {
DWORD reg_EBX;
DWORD reg_EDX;
DWORD reg_ECX;
DWORD reg_EAX;
DWORD reg_EDI;
DWORD reg_ESI;
DWORD reg_Flags;
}
DIOC_REGISTERS, *PDIOC_REGISTERS;
#define LEVEL0_LOCK 0
#define LEVEL1_LOCK 1
#define LEVEL2_LOCK 2
#define LEVEL3_LOCK 3
#define LEVEL1_LOCK_MAX_PERMISSION 0x0001
#define DRIVE_IS_REMOTE 0x1000
#define DRIVE_IS_SUBST 0x8000
/*********************************************************
**** Note: all MS-DOS data structures must be packed ****
**** on a one-byte boundary. ****
*********************************************************/
#pragma pack(1)
typedef struct _DISKIO {
DWORD diStartSector; /* sector number to start at */
WORD diSectors; /* number of sectors */
DWORD diBuffer; /* address of buffer */
}
DISKIO, *PDISKIO;
typedef struct MID {
WORD midInfoLevel; /* information level, must be 0 */
DWORD midSerialNum; /* serial number for the medium */
char midVolLabel[11]; /* volume label for the medium */
char midFileSysType[8]; /* type of file system as 8-byte ASCII */
}
MID, *PMID;
typedef struct driveparams { /* Disk geometry */
BYTE special;
BYTE devicetype;
WORD deviceattrs;
WORD cylinders;
BYTE mediatype;
/* BPB starts here */
WORD bytespersector;
BYTE sectorspercluster;
WORD reservedsectors;
BYTE numberofFATs;
WORD rootdirsize;
WORD totalsectors;
BYTE mediaid;
WORD sectorsperfat;
WORD sectorspertrack;
WORD heads;
DWORD hiddensectors;
DWORD bigtotalsectors;
BYTE reserved[6];
/* BPB ends here */
WORD sectorcount;
WORD sectortable[80];
} DRIVEPARAMS, *PDRIVEPARAMS;
/*}}}*/
static char *strwin32error(void) /*{{{*/
{
static char buffer[1024];
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), /* Default language */
(LPTSTR)buffer,
1023, NULL);
return buffer;
}
/*}}}*/
static BOOL LockVolume( HANDLE hDisk ) /*{{{*/
{
DWORD ReturnedByteCount;
return DeviceIoControl( hDisk, FSCTL_LOCK_VOLUME, NULL, 0, NULL,
0, &ReturnedByteCount, NULL );
}
/*}}}*/
static BOOL UnlockVolume( HANDLE hDisk ) /*{{{*/
{
DWORD ReturnedByteCount;
return DeviceIoControl( hDisk, FSCTL_UNLOCK_VOLUME, NULL, 0, NULL,
0, &ReturnedByteCount, NULL );
}
/*}}}*/
static BOOL DismountVolume( HANDLE hDisk ) /*{{{*/
{
DWORD ReturnedByteCount;
return DeviceIoControl( hDisk, FSCTL_DISMOUNT_VOLUME, NULL, 0, NULL,
0, &ReturnedByteCount, NULL );
}
/*}}}*/
static int GetDriveParams( HANDLE hVWin32Device, int volume, DRIVEPARAMS* pParam ) /*{{{*/
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
reg.reg_EAX = 0x440d; /* IOCTL for block device */
reg.reg_EBX = volume; /* one-based drive number */
reg.reg_ECX = 0x0860; /* Get Device params */
reg.reg_EDX = (DWORD)pParam;
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( hVWin32Device, VWIN32_DIOC_DOS_IOCTL,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
if ( !bResult || (reg.reg_Flags & 1) )
return (reg.reg_EAX & 0xffff);
return 0;
}
/*}}}*/
static int SetDriveParams( HANDLE hVWin32Device, int volume, DRIVEPARAMS* pParam ) /*{{{*/
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
reg.reg_EAX = 0x440d; /* IOCTL for block device */
reg.reg_EBX = volume; /* one-based drive number */
reg.reg_ECX = 0x0840; /* Set Device params */
reg.reg_EDX = (DWORD)pParam;
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( hVWin32Device, VWIN32_DIOC_DOS_IOCTL,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
if ( !bResult || (reg.reg_Flags & 1) )
return (reg.reg_EAX & 0xffff);
return 0;
}
/*}}}*/
static int GetMediaID( HANDLE hVWin32Device, int volume, MID* pMid ) /*{{{*/
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
reg.reg_EAX = 0x440d; /* IOCTL for block device */
reg.reg_EBX = volume; /* one-based drive number */
reg.reg_ECX = 0x0866; /* Get Media ID */
reg.reg_EDX = (DWORD)pMid;
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( hVWin32Device, VWIN32_DIOC_DOS_IOCTL,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
if ( !bResult || (reg.reg_Flags & 1) )
return (reg.reg_EAX & 0xffff);
return 0;
}
/*}}}*/
static int VolumeCheck(HANDLE hVWin32Device, int volume, WORD* flags ) /*{{{*/
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
reg.reg_EAX = 0x4409; /* Is Drive Remote */
reg.reg_EBX = volume; /* one-based drive number */
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( hVWin32Device, VWIN32_DIOC_DOS_IOCTL,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
if ( !bResult || (reg.reg_Flags & 1) )
return (reg.reg_EAX & 0xffff);
*flags = (WORD)(reg.reg_EDX & 0xffff);
return 0;
}
/*}}}*/
static int LockLogicalVolume(HANDLE hVWin32Device, int volume, int lock_level, int permissions) /*{{{*/
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
reg.reg_EAX = 0x440d; /* generic IOCTL */
reg.reg_ECX = 0x084a; /* lock logical volume */
reg.reg_EBX = volume | (lock_level << 8);
reg.reg_EDX = permissions;
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( hVWin32Device, VWIN32_DIOC_DOS_IOCTL,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
if ( !bResult || (reg.reg_Flags & 1) )
return (reg.reg_EAX & 0xffff);
return 0;
}
/*}}}*/
static int UnlockLogicalVolume( HANDLE hVWin32Device, int volume ) /*{{{*/
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
reg.reg_EAX = 0x440d;
reg.reg_ECX = 0x086a; /* lock logical volume */
reg.reg_EBX = volume;
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( hVWin32Device, VWIN32_DIOC_DOS_IOCTL,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
if ( !bResult || (reg.reg_Flags & 1) ) return -1;
return 0;
}
/*}}}*/
static int w32mode(int mode) /*{{{*/
{
switch(mode)
{
case O_RDONLY: return GENERIC_READ;
case O_WRONLY: return GENERIC_WRITE;
}
return GENERIC_READ | GENERIC_WRITE;
}
/*}}}*/
/* Device_open -- Open an image file */ /*{{{*/
const char *Device_open(struct Device *sb, const char *filename, int mode, const char *deviceOpts)
{
/* Windows 95/NT: floppy drives using handles */
if (strlen(filename) == 2 && filename[1] == ':') /* Drive name */
{
char vname[20];
DWORD dwVers;
sb->fd = -1;
dwVers = GetVersion();
if (dwVers & 0x80000000L) /* Win32s (3.1) or Win32c (Win95) */
{
int lock, driveno, res, permissions;
unsigned short drive_flags;
MID media;
vname[0] = toupper(filename[0]);
driveno = vname[0] - 'A' + 1; /* 1=A: 2=B: */
sb->drvtype = CPMDRV_WIN95;
sb->hdisk = CreateFile( "\\\\.\\vwin32",
0,
0,
NULL,
0,
FILE_FLAG_DELETE_ON_CLOSE,
NULL );
if (!sb->hdisk)
{
return "Failed to open VWIN32 driver.";
}
if (VolumeCheck(sb->hdisk, driveno, &drive_flags))
{
CloseHandle(sb->hdisk);
return "Invalid drive";
}
res = GetMediaID( sb->hdisk, driveno, &media );
if ( res )
{
const char *lboo = NULL;
if ( res == ERROR_INVALID_FUNCTION &&
(drive_flags & DRIVE_IS_REMOTE ))
lboo = "Network drive";
else if (res == ERROR_ACCESS_DENIED) lboo = "Access denied";
/* nb: It's perfectly legitimate for GetMediaID() to fail; most CP/M */
/* CP/M disks won't have a media ID. */
if (lboo != NULL)
{
CloseHandle(sb->hdisk);
return lboo;
}
}
if (!res &&
(!memcmp( media.midFileSysType, "CDROM", 5 ) ||
!memcmp( media.midFileSysType, "CD001", 5 ) ||
!memcmp( media.midFileSysType, "CDAUDIO", 5 )))
{
CloseHandle(sb->hdisk);
return "CD-ROM drive";
}
if (w32mode(mode) & GENERIC_WRITE)
{
lock = LEVEL0_LOCK; /* Exclusive access */
permissions = 0;
}
else
{
lock = LEVEL1_LOCK; /* Allow other processes access */
permissions = LEVEL1_LOCK_MAX_PERMISSION;
}
if (LockLogicalVolume( sb->hdisk, driveno, lock, permissions))
{
CloseHandle(sb->hdisk);
return "Could not acquire a lock on the drive.";
}
sb->fd = driveno; /* 1=A: 2=B: etc - we will need this later */
}
else
{
sprintf(vname, "\\\\.\\%s", filename);
sb->drvtype = CPMDRV_WINNT;
sb->hdisk = CreateFile(vname, /* Name */
w32mode(mode), /* Access mode */
FILE_SHARE_READ|FILE_SHARE_WRITE, /*Sharing*/
NULL, /* Security attributes */
OPEN_EXISTING, /* See MSDN */
0, /* Flags & attributes */
NULL); /* Template file */
if (sb->hdisk != INVALID_HANDLE_VALUE)
{
sb->fd = 1; /* Arbitrary value >0 */
if (LockVolume(sb->hdisk) == FALSE) /* Lock drive */
{
char *lboo = strwin32error();
CloseHandle(sb->hdisk);
sb->fd = -1;
return lboo;
}
}
else return strwin32error();
}
sb->opened = 1;
return NULL;
}
/* Not a floppy. Treat it as a normal file */
mode |= O_BINARY;
sb->fd = open(filename, mode);
if (sb->fd == -1) return strerror(errno);
sb->drvtype = CPMDRV_FILE;
sb->opened = 1;
return NULL;
}
/*}}}*/
/* Device_setGeometry -- Set disk geometry */ /*{{{*/
const char * Device_setGeometry(struct Device *this, int secLength, int sectrk, int tracks, off_t offset, const char *libdskGeometry)
{
int n;
this->secLength=secLength;
this->sectrk=sectrk;
this->tracks=tracks;
// Bill Buckels - add this->offset
this->offset=offset;
// Bill Buckels - not sure what to do here
if (this->drvtype == CPMDRV_WIN95)
{
DRIVEPARAMS drvp;
memset(&drvp, 0, sizeof(drvp));
if (GetDriveParams( this->hdisk, this->fd, &drvp )) return "GetDriveParams failed";
drvp.bytespersector = secLength;
drvp.sectorspertrack = sectrk;
drvp.totalsectors = sectrk * tracks;
/* Guess the cylinder/head configuration from the track count. This will
* get single-sided 80-track discs wrong, but it's that or double-sided
* 40-track (or add cylinder/head counts to diskdefs)
*/
if (tracks < 44)
{
drvp.cylinders = tracks;
drvp.heads = 1;
}
else
{
drvp.cylinders = tracks / 2;
drvp.heads = 2;
}
/* Set up "reasonable" values for the other members */
drvp.sectorspercluster = 1024 / secLength;
drvp.reservedsectors = 1;
drvp.numberofFATs = 2;
drvp.sectorcount = sectrk;
drvp.rootdirsize = 64;
drvp.mediaid = 0xF0;
drvp.hiddensectors = 0;
drvp.sectorsperfat = 3;
for (n = 0; n < sectrk; n++)
{
drvp.sectortable[n*2] = n + PHYSICAL_SECTOR_1; /* Physical sector numbers */
drvp.sectortable[n*2+1] = secLength;
}
drvp.special = 6;
/* We have not set:
drvp.mediatype
drvp.devicetype
drvp.deviceattrs
which should have been read correctly by GetDriveParams().
*/
SetDriveParams( this->hdisk, this->fd, &drvp );
}
return NULL;
}
/*}}}*/
/* Device_close -- Close an image file */ /*{{{*/
const char *Device_close(struct Device *sb)
{
sb->opened = 0;
switch(sb->drvtype)
{
case CPMDRV_WIN95:
UnlockLogicalVolume(sb->hdisk, sb->fd );
if (!CloseHandle( sb->hdisk )) return strwin32error();
return NULL;
case CPMDRV_WINNT:
DismountVolume(sb->hdisk);
UnlockVolume(sb->hdisk);
if (!CloseHandle(sb->hdisk)) return strwin32error();
return NULL;
}
if (close(sb->fd)) return strerror(errno);
return NULL;
}
/*}}}*/
/* Device_readSector -- read a physical sector */ /*{{{*/
const char *Device_readSector(const struct Device *drive, int track, int sector, char *buf)
{
int res;
off_t offset;
assert(sector>=0);
assert(sector<drive->sectrk);
assert(track>=0);
assert(track<drive->tracks);
offset = ((sector+track*drive->sectrk)*drive->secLength);
if (drive->drvtype == CPMDRV_WINNT)
{
LPVOID iobuffer;
DWORD bytesread;
// Bill Buckels - add drive->offset
if (SetFilePointer(drive->hdisk, offset+drive->offset, NULL, FILE_BEGIN) == INVALID_FILE_SIZE)
{
return strwin32error();
}
iobuffer = VirtualAlloc(NULL, drive->secLength, MEM_COMMIT, PAGE_READWRITE);
if (!iobuffer)
{
return strwin32error();
}
res = ReadFile(drive->hdisk, iobuffer, drive->secLength, &bytesread, NULL);
if (!res)
{
char *lboo = strwin32error();
VirtualFree(iobuffer, drive->secLength, MEM_RELEASE);
return lboo;
}
memcpy(buf, iobuffer, drive->secLength);
VirtualFree(iobuffer, drive->secLength, MEM_RELEASE);
if (bytesread < (unsigned)drive->secLength)
{
memset(buf + bytesread, 0, drive->secLength - bytesread);
}
return NULL;
}
// Bill Buckels - not sure what to do here
if (drive->drvtype == CPMDRV_WIN95)
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
#ifdef USE_INT13
int cyl, head;
if (drive->tracks < 44) { cyl = track; head = 0; }
else { cyl = track/2; head = track & 1; }
reg.reg_EAX = 0x0201; /* Read 1 sector */
reg.reg_EBX = (DWORD)buf;
reg.reg_ECX = (cyl << 8) | (sector + PHYSICAL_SECTOR_1);
reg.reg_EDX = (head << 8) | (drive->fd - 1);
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( drive->hdisk, VWIN32_DIOC_DOS_INT13,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
#else
DISKIO di;
reg.reg_EAX = drive->fd - 1; /* zero-based volume number */
reg.reg_EBX = (DWORD)&di;
reg.reg_ECX = 0xffff; /* use DISKIO structure */
reg.reg_Flags = 1; /* preset the carry flag */
di.diStartSector = sector+track*drive->sectrk;
di.diSectors = 1;
di.diBuffer = (DWORD)buf;
bResult = DeviceIoControl( drive->hdisk, VWIN32_DIOC_DOS_INT25,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
#endif
if ( !bResult || (reg.reg_Flags & 1) )
{
if (GetLastError()) return strwin32error();
return "Unknown read error.";
}
return 0;
}
// Bill Buckels - add drive->offset
if (lseek(drive->fd,offset+drive->offset,SEEK_SET)==-1)
{
return strerror(errno);
}
if ((res=read(drive->fd, buf, drive->secLength)) != drive->secLength)
{
if (res==-1)
{
return strerror(errno);
}
else memset(buf+res,0,drive->secLength-res); /* hit end of disk image */
}
return NULL;
}
/*}}}*/
/* Device_writeSector -- write physical sector */ /*{{{*/
const char *Device_writeSector(const struct Device *drive, int track, int sector, const char *buf)
{
off_t offset;
int res;
assert(sector>=0);
assert(sector<drive->sectrk);
assert(track>=0);
assert(track<drive->tracks);
offset = ((sector+track*drive->sectrk)*drive->secLength);
if (drive->drvtype == CPMDRV_WINNT)
{
LPVOID iobuffer;
DWORD byteswritten;
// Bill Buckels - add drive->offset
if (SetFilePointer(drive->hdisk, offset+drive->offset, NULL, FILE_BEGIN) == INVALID_FILE_SIZE)
{
return strwin32error();
}
iobuffer = VirtualAlloc(NULL, drive->secLength, MEM_COMMIT, PAGE_READWRITE);
if (!iobuffer)
{
return strwin32error();
}
memcpy(iobuffer, buf, drive->secLength);
res = WriteFile(drive->hdisk, iobuffer, drive->secLength, &byteswritten, NULL);
if (!res || (byteswritten < (unsigned)drive->secLength))
{
char *lboo = strwin32error();
VirtualFree(iobuffer, drive->secLength, MEM_RELEASE);
return lboo;
}
VirtualFree(iobuffer, drive->secLength, MEM_RELEASE);
return NULL;
}
// Bill Buckels - not sure what to do here
if (drive->drvtype == CPMDRV_WIN95)
{
DIOC_REGISTERS reg;
BOOL bResult;
DWORD cb;
#ifdef USE_INT13
int cyl, head;
if (drive->tracks < 44) { cyl = track; head = 0; }
else { cyl = track/2; head = track & 1; }
reg.reg_EAX = 0x0301; /* Write 1 sector */
reg.reg_EBX = (DWORD)buf;
reg.reg_ECX = (cyl << 8) | (sector + PHYSICAL_SECTOR_1);
reg.reg_EDX = (head << 8) | (drive->fd - 1);
reg.reg_Flags = 1; /* preset the carry flag */
bResult = DeviceIoControl( drive->hdisk, VWIN32_DIOC_DOS_INT13,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
#else
DISKIO di;
reg.reg_EAX = drive->fd - 1; /* zero-based volume number */
reg.reg_EBX = (DWORD)&di;
reg.reg_ECX = 0xffff; /* use DISKIO structure */
reg.reg_Flags = 1; /* preset the carry flag */
di.diStartSector = sector+track*drive->sectrk;
di.diSectors = 1;
di.diBuffer = (DWORD)buf;
bResult = DeviceIoControl( drive->hdisk, VWIN32_DIOC_DOS_INT26,
®, sizeof( reg ), ®, sizeof( reg ), &cb, 0 );
#endif
if ( !bResult || (reg.reg_Flags & 1) )
{
if (GetLastError()) return strwin32error();
return "Unknown write error.";
}
return NULL;
}
// Bill Buckels - add drive->offset
if (lseek(drive->fd,offset+drive->offset, SEEK_SET)==-1)
{
return strerror(errno);
}
if (write(drive->fd, buf, drive->secLength) == drive->secLength) return NULL;
return strerror(errno);
}
/*}}}*/