2 * COPYRIGHT: GPL - See COPYING in the top level directory
3 * PROJECT: ReactOS Virtual DOS Machine
5 * PURPOSE: VDM DOS Kernel
6 * PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
9 /* INCLUDES *******************************************************************/
17 #include "registers.h"
19 /* PRIVATE VARIABLES **********************************************************/
21 static WORD CurrentPsp
= SYSTEM_PSP
;
22 static WORD DosLastError
= 0;
23 static DWORD DiskTransferArea
;
24 static BYTE CurrentDrive
;
25 static CHAR LastDrive
= 'E';
26 static CHAR CurrentDirectories
[NUM_DRIVES
][DOS_DIR_LENGTH
];
27 static HANDLE DosSystemFileTable
[DOS_SFT_SIZE
];
28 static WORD DosSftRefCount
[DOS_SFT_SIZE
];
29 static BYTE DosAllocStrategy
= DOS_ALLOC_BEST_FIT
;
30 static BOOLEAN DosUmbLinked
= FALSE
;
31 static WORD DosErrorLevel
= 0x0000;
33 /* PRIVATE FUNCTIONS **********************************************************/
35 /* Taken from base/shell/cmd/console.c */
36 static BOOL
IsConsoleHandle(HANDLE hHandle
)
40 /* Check whether the handle may be that of a console... */
41 if ((GetFileType(hHandle
) & FILE_TYPE_CHAR
) == 0) return FALSE
;
44 * It may be. Perform another test... The idea comes from the
45 * MSDN description of the WriteConsole API:
47 * "WriteConsole fails if it is used with a standard handle
48 * that is redirected to a file. If an application processes
49 * multilingual output that can be redirected, determine whether
50 * the output handle is a console handle (one method is to call
51 * the GetConsoleMode function and check whether it succeeds).
52 * If the handle is a console handle, call WriteConsole. If the
53 * handle is not a console handle, the output is redirected and
54 * you should call WriteFile to perform the I/O."
56 return GetConsoleMode(hHandle
, &dwMode
);
59 static VOID
DosCombineFreeBlocks(WORD StartBlock
)
61 PDOS_MCB CurrentMcb
= SEGMENT_TO_MCB(StartBlock
), NextMcb
;
63 /* If this is the last block or it's not free, quit */
64 if (CurrentMcb
->BlockType
== 'Z' || CurrentMcb
->OwnerPsp
!= 0) return;
68 /* Get a pointer to the next MCB */
69 NextMcb
= SEGMENT_TO_MCB(StartBlock
+ CurrentMcb
->Size
+ 1);
71 /* Check if the next MCB is free */
72 if (NextMcb
->OwnerPsp
== 0)
75 CurrentMcb
->Size
+= NextMcb
->Size
+ 1;
76 CurrentMcb
->BlockType
= NextMcb
->BlockType
;
77 NextMcb
->BlockType
= 'I';
81 /* No more adjoining free blocks */
87 static WORD
DosCopyEnvironmentBlock(WORD SourceSegment
, LPCSTR ProgramName
)
89 PCHAR Ptr
, SourceBuffer
, DestBuffer
= NULL
;
93 Ptr
= SourceBuffer
= (PCHAR
)SEG_OFF_TO_PTR(SourceSegment
, 0);
95 /* Calculate the size of the environment block */
98 TotalSize
+= strlen(Ptr
) + 1;
99 Ptr
+= strlen(Ptr
) + 1;
103 /* Add the string buffer size */
104 TotalSize
+= strlen(ProgramName
) + 1;
106 /* Allocate the memory for the environment block */
107 DestSegment
= DosAllocateMemory((WORD
)((TotalSize
+ 0x0F) >> 4), NULL
);
108 if (!DestSegment
) return 0;
112 DestBuffer
= (PCHAR
)SEG_OFF_TO_PTR(DestSegment
, 0);
115 /* Copy the string */
116 strcpy(DestBuffer
, Ptr
);
118 /* Advance to the next string */
119 DestBuffer
+= strlen(Ptr
);
120 Ptr
+= strlen(Ptr
) + 1;
122 /* Put a zero after the string */
126 /* Set the final zero */
129 /* Copy the program name after the environment block */
130 strcpy(DestBuffer
, ProgramName
);
135 static VOID
DosChangeMemoryOwner(WORD Segment
, WORD NewOwner
)
137 PDOS_MCB Mcb
= SEGMENT_TO_MCB(Segment
- 1);
139 /* Just set the owner */
140 Mcb
->OwnerPsp
= NewOwner
;
143 static WORD
DosOpenHandle(HANDLE Handle
)
150 /* The system PSP has no handle table */
151 if (CurrentPsp
== SYSTEM_PSP
) return INVALID_DOS_HANDLE
;
153 /* Get a pointer to the handle table */
154 PspBlock
= SEGMENT_TO_PSP(CurrentPsp
);
155 HandleTable
= (LPBYTE
)FAR_POINTER(PspBlock
->HandleTablePtr
);
157 /* Find a free entry in the JFT */
158 for (DosHandle
= 0; DosHandle
< PspBlock
->HandleTableSize
; DosHandle
++)
160 if (HandleTable
[DosHandle
] == 0xFF) break;
163 /* If there are no free entries, fail */
164 if (DosHandle
== PspBlock
->HandleTableSize
) return INVALID_DOS_HANDLE
;
166 /* Check if the handle is already in the SFT */
167 for (i
= 0; i
< DOS_SFT_SIZE
; i
++)
169 /* Check if this is the same handle */
170 if (DosSystemFileTable
[i
] != Handle
) continue;
172 /* Already in the table, reference it */
175 /* Set the JFT entry to that SFT index */
176 HandleTable
[DosHandle
] = i
;
178 /* Return the new handle */
182 /* Add the handle to the SFT */
183 for (i
= 0; i
< DOS_SFT_SIZE
; i
++)
185 /* Make sure this is an empty table entry */
186 if (DosSystemFileTable
[i
] != INVALID_HANDLE_VALUE
) continue;
188 /* Initialize the empty table entry */
189 DosSystemFileTable
[i
] = Handle
;
190 DosSftRefCount
[i
] = 1;
192 /* Set the JFT entry to that SFT index */
193 HandleTable
[DosHandle
] = i
;
195 /* Return the new handle */
199 /* The SFT is full */
200 return INVALID_DOS_HANDLE
;
203 static HANDLE
DosGetRealHandle(WORD DosHandle
)
208 /* The system PSP has no handle table */
209 if (CurrentPsp
== SYSTEM_PSP
) return INVALID_HANDLE_VALUE
;
211 /* Get a pointer to the handle table */
212 PspBlock
= SEGMENT_TO_PSP(CurrentPsp
);
213 HandleTable
= (LPBYTE
)FAR_POINTER(PspBlock
->HandleTablePtr
);
215 /* Make sure the handle is open */
216 if (HandleTable
[DosHandle
] == 0xFF) return INVALID_HANDLE_VALUE
;
218 /* Return the Win32 handle */
219 return DosSystemFileTable
[HandleTable
[DosHandle
]];
222 static VOID
DosCopyHandleTable(LPBYTE DestinationTable
)
228 /* Clear the table first */
229 for (i
= 0; i
< 20; i
++) DestinationTable
[i
] = 0xFF;
231 /* Check if this is the initial process */
232 if (CurrentPsp
== SYSTEM_PSP
)
234 /* Set up the standard I/O devices */
235 for (i
= 0; i
<= 2; i
++)
237 /* Set the index in the SFT */
238 DestinationTable
[i
] = (BYTE
)i
;
240 /* Increase the reference count */
248 /* Get the parent PSP block and handle table */
249 PspBlock
= SEGMENT_TO_PSP(CurrentPsp
);
250 SourceTable
= (LPBYTE
)FAR_POINTER(PspBlock
->HandleTablePtr
);
252 /* Copy the first 20 handles into the new table */
253 for (i
= 0; i
< 20; i
++)
255 DestinationTable
[i
] = SourceTable
[i
];
257 /* Increase the reference count */
258 DosSftRefCount
[SourceTable
[i
]]++;
262 /* PUBLIC FUNCTIONS ***********************************************************/
264 WORD
DosAllocateMemory(WORD Size
, WORD
*MaxAvailable
)
266 WORD Result
= 0, Segment
= FIRST_MCB_SEGMENT
, MaxSize
= 0;
267 PDOS_MCB CurrentMcb
, NextMcb
;
268 BOOLEAN SearchUmb
= FALSE
;
270 DPRINT("DosAllocateMemory: Size 0x%04X\n", Size
);
272 if (DosUmbLinked
&& (DosAllocStrategy
& (DOS_ALLOC_HIGH
| DOS_ALLOC_HIGH_LOW
)))
274 /* Search UMB first */
275 Segment
= UMB_START_SEGMENT
;
281 /* Get a pointer to the MCB */
282 CurrentMcb
= SEGMENT_TO_MCB(Segment
);
284 /* Make sure it's valid */
285 if (CurrentMcb
->BlockType
!= 'M' && CurrentMcb
->BlockType
!= 'Z')
287 DPRINT("The DOS memory arena is corrupted!\n");
288 DosLastError
= ERROR_ARENA_TRASHED
;
292 /* Only check free blocks */
293 if (CurrentMcb
->OwnerPsp
!= 0) goto Next
;
295 /* Combine this free block with adjoining free blocks */
296 DosCombineFreeBlocks(Segment
);
298 /* Update the maximum block size */
299 if (CurrentMcb
->Size
> MaxSize
) MaxSize
= CurrentMcb
->Size
;
301 /* Check if this block is big enough */
302 if (CurrentMcb
->Size
< Size
) goto Next
;
304 switch (DosAllocStrategy
& 0x3F)
306 case DOS_ALLOC_FIRST_FIT
:
308 /* For first fit, stop immediately */
313 case DOS_ALLOC_BEST_FIT
:
315 /* For best fit, update the smallest block found so far */
316 if ((Result
== 0) || (CurrentMcb
->Size
< SEGMENT_TO_MCB(Result
)->Size
))
324 case DOS_ALLOC_LAST_FIT
:
326 /* For last fit, make the current block the result, but keep searching */
333 /* If this was the last MCB in the chain, quit */
334 if (CurrentMcb
->BlockType
== 'Z')
336 /* Check if nothing was found while searching through UMBs */
337 if ((Result
== 0) && SearchUmb
&& (DosAllocStrategy
& DOS_ALLOC_HIGH_LOW
))
339 /* Search low memory */
340 Segment
= FIRST_MCB_SEGMENT
;
347 /* Otherwise, update the segment and continue */
348 Segment
+= CurrentMcb
->Size
+ 1;
353 /* If we didn't find a free block, return 0 */
356 DosLastError
= ERROR_NOT_ENOUGH_MEMORY
;
357 if (MaxAvailable
) *MaxAvailable
= MaxSize
;
361 /* Get a pointer to the MCB */
362 CurrentMcb
= SEGMENT_TO_MCB(Result
);
364 /* Check if the block is larger than requested */
365 if (CurrentMcb
->Size
> Size
)
367 /* It is, split it into two blocks */
368 NextMcb
= SEGMENT_TO_MCB(Result
+ Size
+ 1);
370 /* Initialize the new MCB structure */
371 NextMcb
->BlockType
= CurrentMcb
->BlockType
;
372 NextMcb
->Size
= CurrentMcb
->Size
- Size
- 1;
373 NextMcb
->OwnerPsp
= 0;
375 /* Update the current block */
376 CurrentMcb
->BlockType
= 'M';
377 CurrentMcb
->Size
= Size
;
380 /* Take ownership of the block */
381 CurrentMcb
->OwnerPsp
= CurrentPsp
;
383 /* Return the segment of the data portion of the block */
387 BOOLEAN
DosResizeMemory(WORD BlockData
, WORD NewSize
, WORD
*MaxAvailable
)
389 BOOLEAN Success
= TRUE
;
390 WORD Segment
= BlockData
- 1, ReturnSize
= 0, NextSegment
;
391 PDOS_MCB Mcb
= SEGMENT_TO_MCB(Segment
), NextMcb
;
393 DPRINT("DosResizeMemory: BlockData 0x%04X, NewSize 0x%04X\n",
397 /* Make sure this is a valid, allocated block */
398 if ((Mcb
->BlockType
!= 'M' && Mcb
->BlockType
!= 'Z') || Mcb
->OwnerPsp
== 0)
401 DosLastError
= ERROR_INVALID_HANDLE
;
405 ReturnSize
= Mcb
->Size
;
407 /* Check if we need to expand or contract the block */
408 if (NewSize
> Mcb
->Size
)
410 /* We can't expand the last block */
411 if (Mcb
->BlockType
!= 'M')
417 /* Get the pointer and segment of the next MCB */
418 NextSegment
= Segment
+ Mcb
->Size
+ 1;
419 NextMcb
= SEGMENT_TO_MCB(NextSegment
);
421 /* Make sure the next segment is free */
422 if (NextMcb
->OwnerPsp
!= 0)
424 DPRINT("Cannot expand memory block: next segment is not free!\n");
425 DosLastError
= ERROR_NOT_ENOUGH_MEMORY
;
430 /* Combine this free block with adjoining free blocks */
431 DosCombineFreeBlocks(NextSegment
);
433 /* Set the maximum possible size of the block */
434 ReturnSize
+= NextMcb
->Size
+ 1;
436 /* Maximize the current block */
437 Mcb
->Size
= ReturnSize
;
438 Mcb
->BlockType
= NextMcb
->BlockType
;
440 /* Invalidate the next block */
441 NextMcb
->BlockType
= 'I';
443 /* Check if the block is larger than requested */
444 if (Mcb
->Size
> NewSize
)
446 DPRINT("Block too large, reducing size from 0x%04X to 0x%04X\n",
450 /* It is, split it into two blocks */
451 NextMcb
= SEGMENT_TO_MCB(Segment
+ NewSize
+ 1);
453 /* Initialize the new MCB structure */
454 NextMcb
->BlockType
= Mcb
->BlockType
;
455 NextMcb
->Size
= Mcb
->Size
- NewSize
- 1;
456 NextMcb
->OwnerPsp
= 0;
458 /* Update the current block */
459 Mcb
->BlockType
= 'M';
463 else if (NewSize
< Mcb
->Size
)
465 DPRINT("Shrinking block from 0x%04X to 0x%04X\n",
469 /* Just split the block */
470 NextMcb
= SEGMENT_TO_MCB(Segment
+ NewSize
+ 1);
471 NextMcb
->BlockType
= Mcb
->BlockType
;
472 NextMcb
->Size
= Mcb
->Size
- NewSize
- 1;
473 NextMcb
->OwnerPsp
= 0;
476 Mcb
->BlockType
= 'M';
481 /* Check if the operation failed */
484 DPRINT("DosResizeMemory FAILED. Maximum available: 0x%04X\n",
487 /* Return the maximum possible size */
488 if (MaxAvailable
) *MaxAvailable
= ReturnSize
;
494 BOOLEAN
DosFreeMemory(WORD BlockData
)
496 PDOS_MCB Mcb
= SEGMENT_TO_MCB(BlockData
- 1);
498 DPRINT("DosFreeMemory: BlockData 0x%04X\n", BlockData
);
500 /* Make sure the MCB is valid */
501 if (Mcb
->BlockType
!= 'M' && Mcb
->BlockType
!= 'Z')
503 DPRINT("MCB block type '%c' not valid!\n", Mcb
->BlockType
);
507 /* Mark the block as free */
513 BOOLEAN
DosLinkUmb(VOID
)
515 DWORD Segment
= FIRST_MCB_SEGMENT
;
516 PDOS_MCB Mcb
= SEGMENT_TO_MCB(Segment
);
518 DPRINT("Linking UMB\n");
520 /* Check if UMBs are already linked */
521 if (DosUmbLinked
) return FALSE
;
523 /* Find the last block */
524 while ((Mcb
->BlockType
== 'M') && (Segment
<= 0xFFFF))
526 Segment
+= Mcb
->Size
+ 1;
527 Mcb
= SEGMENT_TO_MCB(Segment
);
530 /* Make sure it's valid */
531 if (Mcb
->BlockType
!= 'Z') return FALSE
;
533 /* Connect the MCB with the UMB chain */
534 Mcb
->BlockType
= 'M';
540 BOOLEAN
DosUnlinkUmb(VOID
)
542 DWORD Segment
= FIRST_MCB_SEGMENT
;
543 PDOS_MCB Mcb
= SEGMENT_TO_MCB(Segment
);
545 DPRINT("Unlinking UMB\n");
547 /* Check if UMBs are already unlinked */
548 if (!DosUmbLinked
) return FALSE
;
550 /* Find the block preceding the MCB that links it with the UMB chain */
551 while (Segment
<= 0xFFFF)
553 if ((Segment
+ Mcb
->Size
) == (FIRST_MCB_SEGMENT
+ USER_MEMORY_SIZE
))
555 /* This is the last non-UMB segment */
559 /* Advance to the next MCB */
560 Segment
+= Mcb
->Size
+ 1;
561 Mcb
= SEGMENT_TO_MCB(Segment
);
564 /* Mark the MCB as the last MCB */
565 Mcb
->BlockType
= 'Z';
567 DosUmbLinked
= FALSE
;
571 WORD
DosCreateFile(LPWORD Handle
, LPCSTR FilePath
, WORD Attributes
)
576 DPRINT("DosCreateFile: FilePath \"%s\", Attributes 0x%04X\n",
580 /* Create the file */
581 FileHandle
= CreateFileA(FilePath
,
582 GENERIC_READ
| GENERIC_WRITE
,
583 FILE_SHARE_READ
| FILE_SHARE_WRITE
| FILE_SHARE_DELETE
,
589 if (FileHandle
== INVALID_HANDLE_VALUE
)
591 /* Return the error code */
592 return (WORD
)GetLastError();
595 /* Open the DOS handle */
596 DosHandle
= DosOpenHandle(FileHandle
);
598 if (DosHandle
== INVALID_DOS_HANDLE
)
600 /* Close the handle */
601 CloseHandle(FileHandle
);
603 /* Return the error code */
604 return ERROR_TOO_MANY_OPEN_FILES
;
607 /* It was successful */
609 return ERROR_SUCCESS
;
612 WORD
DosOpenFile(LPWORD Handle
, LPCSTR FilePath
, BYTE AccessMode
)
615 ACCESS_MASK Access
= 0;
618 DPRINT("DosOpenFile: FilePath \"%s\", AccessMode 0x%04X\n",
622 /* Parse the access mode */
623 switch (AccessMode
& 3)
628 Access
= GENERIC_READ
;
635 Access
= GENERIC_WRITE
;
642 Access
= GENERIC_READ
| GENERIC_WRITE
;
649 return ERROR_INVALID_PARAMETER
;
654 FileHandle
= CreateFileA(FilePath
,
656 FILE_SHARE_READ
| FILE_SHARE_WRITE
| FILE_SHARE_DELETE
,
659 FILE_ATTRIBUTE_NORMAL
,
662 if (FileHandle
== INVALID_HANDLE_VALUE
)
664 /* Return the error code */
665 return (WORD
)GetLastError();
668 /* Open the DOS handle */
669 DosHandle
= DosOpenHandle(FileHandle
);
671 if (DosHandle
== INVALID_DOS_HANDLE
)
673 /* Close the handle */
674 CloseHandle(FileHandle
);
676 /* Return the error code */
677 return ERROR_TOO_MANY_OPEN_FILES
;
680 /* It was successful */
682 return ERROR_SUCCESS
;
685 WORD
DosReadFile(WORD FileHandle
, LPVOID Buffer
, WORD Count
, LPWORD BytesRead
)
687 WORD Result
= ERROR_SUCCESS
;
688 DWORD BytesRead32
= 0;
689 HANDLE Handle
= DosGetRealHandle(FileHandle
);
691 DPRINT("DosReadFile: FileHandle 0x%04X, Count 0x%04X\n", FileHandle
, Count
);
693 /* Make sure the handle is valid */
694 if (Handle
== INVALID_HANDLE_VALUE
) return ERROR_INVALID_HANDLE
;
697 if (!ReadFile(Handle
, Buffer
, Count
, &BytesRead32
, NULL
))
699 /* Store the error code */
700 Result
= (WORD
)GetLastError();
703 /* The number of bytes read is always 16-bit */
704 *BytesRead
= LOWORD(BytesRead32
);
706 /* Return the error code */
710 WORD
DosWriteFile(WORD FileHandle
, LPVOID Buffer
, WORD Count
, LPWORD BytesWritten
)
712 WORD Result
= ERROR_SUCCESS
;
713 DWORD BytesWritten32
= 0;
714 HANDLE Handle
= DosGetRealHandle(FileHandle
);
717 DPRINT("DosWriteFile: FileHandle 0x%04X, Count 0x%04X\n",
721 /* Make sure the handle is valid */
722 if (Handle
== INVALID_HANDLE_VALUE
) return ERROR_INVALID_HANDLE
;
724 if (IsConsoleHandle(Handle
))
726 for (i
= 0; i
< Count
; i
++)
728 /* Call the BIOS to print the character */
729 BiosPrintCharacter(((LPBYTE
)Buffer
)[i
], DOS_CHAR_ATTRIBUTE
, Bda
->VideoPage
);
736 if (!WriteFile(Handle
, Buffer
, Count
, &BytesWritten32
, NULL
))
738 /* Store the error code */
739 Result
= (WORD
)GetLastError();
743 /* The number of bytes written is always 16-bit */
744 *BytesWritten
= LOWORD(BytesWritten32
);
746 /* Return the error code */
750 WORD
DosSeekFile(WORD FileHandle
, LONG Offset
, BYTE Origin
, LPDWORD NewOffset
)
752 WORD Result
= ERROR_SUCCESS
;
754 HANDLE Handle
= DosGetRealHandle(FileHandle
);
756 DPRINT("DosSeekFile: FileHandle 0x%04X, Offset 0x%08X, Origin 0x%02X\n",
761 /* Make sure the handle is valid */
762 if (Handle
== INVALID_HANDLE_VALUE
) return ERROR_INVALID_HANDLE
;
764 /* Check if the origin is valid */
765 if (Origin
!= FILE_BEGIN
&& Origin
!= FILE_CURRENT
&& Origin
!= FILE_END
)
767 return ERROR_INVALID_FUNCTION
;
770 /* Move the file pointer */
771 FilePointer
= SetFilePointer(Handle
, Offset
, NULL
, Origin
);
773 /* Check if there's a possibility the operation failed */
774 if (FilePointer
== INVALID_SET_FILE_POINTER
)
776 /* Get the real error code */
777 Result
= (WORD
)GetLastError();
780 if (Result
!= ERROR_SUCCESS
)
782 /* The operation did fail */
786 /* Return the file pointer, if requested */
787 if (NewOffset
) *NewOffset
= FilePointer
;
790 return ERROR_SUCCESS
;
793 BOOLEAN
DosFlushFileBuffers(WORD FileHandle
)
795 HANDLE Handle
= DosGetRealHandle(FileHandle
);
797 /* Make sure the handle is valid */
798 if (Handle
== INVALID_HANDLE_VALUE
) return FALSE
;
801 * No need to check whether the handle is a console handle since
802 * FlushFileBuffers() automatically does this check and calls
803 * FlushConsoleInputBuffer() for us.
805 // if (IsConsoleHandle(Handle))
806 // return (BOOLEAN)FlushConsoleInputBuffer(Handle);
808 return (BOOLEAN
)FlushFileBuffers(Handle
);
811 BOOLEAN
DosDuplicateHandle(WORD OldHandle
, WORD NewHandle
)
817 DPRINT("DosDuplicateHandle: OldHandle 0x%04X, NewHandle 0x%04X\n",
821 /* The system PSP has no handle table */
822 if (CurrentPsp
== SYSTEM_PSP
) return FALSE
;
824 /* Get a pointer to the handle table */
825 PspBlock
= SEGMENT_TO_PSP(CurrentPsp
);
826 HandleTable
= (LPBYTE
)FAR_POINTER(PspBlock
->HandleTablePtr
);
828 /* Make sure the old handle is open */
829 if (HandleTable
[OldHandle
] == 0xFF) return FALSE
;
831 /* Check if the new handle is open */
832 if (HandleTable
[NewHandle
] != 0xFF)
835 DosCloseHandle(NewHandle
);
838 /* Increment the reference count of the SFT entry */
839 SftIndex
= HandleTable
[OldHandle
];
840 DosSftRefCount
[SftIndex
]++;
842 /* Make the new handle point to that SFT entry */
843 HandleTable
[NewHandle
] = SftIndex
;
849 BOOLEAN
DosCloseHandle(WORD DosHandle
)
855 DPRINT("DosCloseHandle: DosHandle 0x%04X\n", DosHandle
);
857 /* The system PSP has no handle table */
858 if (CurrentPsp
== SYSTEM_PSP
) return FALSE
;
860 /* Get a pointer to the handle table */
861 PspBlock
= SEGMENT_TO_PSP(CurrentPsp
);
862 HandleTable
= (LPBYTE
)FAR_POINTER(PspBlock
->HandleTablePtr
);
864 /* Make sure the handle is open */
865 if (HandleTable
[DosHandle
] == 0xFF) return FALSE
;
867 /* Decrement the reference count of the SFT entry */
868 SftIndex
= HandleTable
[DosHandle
];
869 DosSftRefCount
[SftIndex
]--;
871 /* Check if the reference count fell to zero */
872 if (!DosSftRefCount
[SftIndex
])
874 /* Close the file, it's no longer needed */
875 CloseHandle(DosSystemFileTable
[SftIndex
]);
877 /* Clear the handle */
878 DosSystemFileTable
[SftIndex
] = INVALID_HANDLE_VALUE
;
881 /* Clear the entry in the JFT */
882 HandleTable
[DosHandle
] = 0xFF;
887 BOOLEAN
DosChangeDrive(BYTE Drive
)
889 WCHAR DirectoryPath
[DOS_CMDLINE_LENGTH
];
891 /* Make sure the drive exists */
892 if (Drive
> (LastDrive
- 'A')) return FALSE
;
894 /* Find the path to the new current directory */
895 swprintf(DirectoryPath
, L
"%c\\%S", Drive
+ 'A', CurrentDirectories
[Drive
]);
897 /* Change the current directory of the process */
898 if (!SetCurrentDirectory(DirectoryPath
)) return FALSE
;
900 /* Set the current drive */
901 CurrentDrive
= Drive
;
907 BOOLEAN
DosChangeDirectory(LPSTR Directory
)
913 /* Make sure the directory path is not too long */
914 if (strlen(Directory
) >= DOS_DIR_LENGTH
)
916 DosLastError
= ERROR_PATH_NOT_FOUND
;
920 /* Get the drive number */
921 DriveNumber
= Directory
[0] - 'A';
923 /* Make sure the drive exists */
924 if (DriveNumber
> (LastDrive
- 'A'))
926 DosLastError
= ERROR_PATH_NOT_FOUND
;
930 /* Get the file attributes */
931 Attributes
= GetFileAttributesA(Directory
);
933 /* Make sure the path exists and is a directory */
934 if ((Attributes
== INVALID_FILE_ATTRIBUTES
)
935 || !(Attributes
& FILE_ATTRIBUTE_DIRECTORY
))
937 DosLastError
= ERROR_PATH_NOT_FOUND
;
941 /* Check if this is the current drive */
942 if (DriveNumber
== CurrentDrive
)
944 /* Change the directory */
945 if (!SetCurrentDirectoryA(Directory
))
947 DosLastError
= LOWORD(GetLastError());
952 /* Get the directory part of the path */
953 Path
= strchr(Directory
, '\\');
956 /* Skip the backslash */
960 /* Set the directory for the drive */
963 strncpy(CurrentDirectories
[DriveNumber
], Path
, DOS_DIR_LENGTH
);
967 CurrentDirectories
[DriveNumber
][0] = '\0';
974 VOID
DosInitializePsp(WORD PspSegment
, LPCSTR CommandLine
, WORD ProgramSize
, WORD Environment
)
976 PDOS_PSP PspBlock
= SEGMENT_TO_PSP(PspSegment
);
977 LPDWORD IntVecTable
= (LPDWORD
)((ULONG_PTR
)BaseAddress
);
979 ZeroMemory(PspBlock
, sizeof(DOS_PSP
));
981 /* Set the exit interrupt */
982 PspBlock
->Exit
[0] = 0xCD; // int 0x20
983 PspBlock
->Exit
[1] = 0x20;
985 /* Set the number of the last paragraph */
986 PspBlock
->LastParagraph
= PspSegment
+ ProgramSize
- 1;
988 /* Save the interrupt vectors */
989 PspBlock
->TerminateAddress
= IntVecTable
[0x22];
990 PspBlock
->BreakAddress
= IntVecTable
[0x23];
991 PspBlock
->CriticalAddress
= IntVecTable
[0x24];
993 /* Set the parent PSP */
994 PspBlock
->ParentPsp
= CurrentPsp
;
996 /* Copy the parent handle table */
997 DosCopyHandleTable(PspBlock
->HandleTable
);
999 /* Set the environment block */
1000 PspBlock
->EnvBlock
= Environment
;
1002 /* Set the handle table pointers to the internal handle table */
1003 PspBlock
->HandleTableSize
= 20;
1004 PspBlock
->HandleTablePtr
= MAKELONG(0x18, PspSegment
);
1006 /* Set the DOS version */
1007 PspBlock
->DosVersion
= DOS_VERSION
;
1009 /* Set the far call opcodes */
1010 PspBlock
->FarCall
[0] = 0xCD; // int 0x21
1011 PspBlock
->FarCall
[1] = 0x21;
1012 PspBlock
->FarCall
[2] = 0xCB; // retf
1014 /* Set the command line */
1015 PspBlock
->CommandLineSize
= (BYTE
)min(strlen(CommandLine
), DOS_CMDLINE_LENGTH
- 1);
1016 RtlCopyMemory(PspBlock
->CommandLine
, CommandLine
, PspBlock
->CommandLineSize
);
1017 PspBlock
->CommandLine
[PspBlock
->CommandLineSize
] = '\r';
1020 BOOLEAN
DosCreateProcess(LPCSTR CommandLine
, WORD EnvBlock
)
1022 BOOLEAN Success
= FALSE
, AllocatedEnvBlock
= FALSE
;
1023 HANDLE FileHandle
= INVALID_HANDLE_VALUE
, FileMapping
= NULL
;
1024 LPBYTE Address
= NULL
;
1025 LPSTR ProgramFilePath
, Parameters
[256];
1026 CHAR CommandLineCopy
[DOS_CMDLINE_LENGTH
];
1030 DWORD i
, FileSize
, ExeSize
;
1031 PIMAGE_DOS_HEADER Header
;
1032 PDWORD RelocationTable
;
1035 DPRINT("DosCreateProcess: CommandLine \"%s\", EnvBlock 0x%04X\n",
1039 /* Save a copy of the command line */
1040 strcpy(CommandLineCopy
, CommandLine
);
1042 // FIXME: Improve parsing (especially: "some_path\with spaces\program.exe" options)
1044 /* Get the file name of the executable */
1045 ProgramFilePath
= strtok(CommandLineCopy
, " \t");
1047 /* Load the parameters in the local array */
1048 while ((ParamCount
< sizeof(Parameters
)/sizeof(Parameters
[0]))
1049 && ((Parameters
[ParamCount
] = strtok(NULL
, " \t")) != NULL
))
1054 /* Open a handle to the executable */
1055 FileHandle
= CreateFileA(ProgramFilePath
,
1060 FILE_ATTRIBUTE_NORMAL
,
1062 if (FileHandle
== INVALID_HANDLE_VALUE
) goto Cleanup
;
1064 /* Get the file size */
1065 FileSize
= GetFileSize(FileHandle
, NULL
);
1067 /* Create a mapping object for the file */
1068 FileMapping
= CreateFileMapping(FileHandle
,
1074 if (FileMapping
== NULL
) goto Cleanup
;
1076 /* Map the file into memory */
1077 Address
= (LPBYTE
)MapViewOfFile(FileMapping
, FILE_MAP_READ
, 0, 0, 0);
1078 if (Address
== NULL
) goto Cleanup
;
1080 /* Did we get an environment segment? */
1083 /* Set a flag to know if the environment block was allocated here */
1084 AllocatedEnvBlock
= TRUE
;
1086 /* No, copy the one from the parent */
1087 EnvBlock
= DosCopyEnvironmentBlock((CurrentPsp
!= SYSTEM_PSP
)
1088 ? SEGMENT_TO_PSP(CurrentPsp
)->EnvBlock
1093 /* Check if this is an EXE file or a COM file */
1094 if (Address
[0] == 'M' && Address
[1] == 'Z')
1098 /* Get the MZ header */
1099 Header
= (PIMAGE_DOS_HEADER
)Address
;
1101 /* Get the base size of the file, in paragraphs (rounded up) */
1102 ExeSize
= (((Header
->e_cp
- 1) * 512) + Header
->e_cblp
+ 0x0F) >> 4;
1104 /* Add the PSP size, in paragraphs */
1105 ExeSize
+= sizeof(DOS_PSP
) >> 4;
1107 /* Add the maximum size that should be allocated */
1108 ExeSize
+= Header
->e_maxalloc
;
1110 /* Make sure it does not pass 0xFFFF */
1111 if (ExeSize
> 0xFFFF) ExeSize
= 0xFFFF;
1113 /* Reduce the size one by one until the allocation is successful */
1114 for (i
= Header
->e_maxalloc
; i
>= Header
->e_minalloc
; i
--, ExeSize
--)
1116 /* Try to allocate that much memory */
1117 Segment
= DosAllocateMemory((WORD
)ExeSize
, NULL
);
1118 if (Segment
!= 0) break;
1121 /* Check if at least the lowest allocation was successful */
1122 if (Segment
== 0) goto Cleanup
;
1124 /* Initialize the PSP */
1125 DosInitializePsp(Segment
,
1130 /* The process owns its own memory */
1131 DosChangeMemoryOwner(Segment
, Segment
);
1132 DosChangeMemoryOwner(EnvBlock
, Segment
);
1134 /* Copy the program to Segment:0100 */
1135 RtlCopyMemory(SEG_OFF_TO_PTR(Segment
, 0x100),
1136 Address
+ (Header
->e_cparhdr
<< 4),
1137 min(FileSize
- (Header
->e_cparhdr
<< 4),
1138 (ExeSize
<< 4) - sizeof(DOS_PSP
)));
1140 /* Get the relocation table */
1141 RelocationTable
= (PDWORD
)(Address
+ Header
->e_lfarlc
);
1143 /* Perform relocations */
1144 for (i
= 0; i
< Header
->e_crlc
; i
++)
1146 /* Get a pointer to the word that needs to be patched */
1147 RelocWord
= (PWORD
)SEG_OFF_TO_PTR(Segment
+ HIWORD(RelocationTable
[i
]),
1148 0x100 + LOWORD(RelocationTable
[i
]));
1150 /* Add the number of the EXE segment to it */
1151 *RelocWord
+= Segment
+ (sizeof(DOS_PSP
) >> 4);
1154 /* Set the initial segment registers */
1158 /* Set the stack to the location from the header */
1159 EmulatorSetStack(Segment
+ (sizeof(DOS_PSP
) >> 4) + Header
->e_ss
,
1163 CurrentPsp
= Segment
;
1164 DiskTransferArea
= MAKELONG(0x80, Segment
);
1165 EmulatorExecute(Segment
+ Header
->e_cs
+ (sizeof(DOS_PSP
) >> 4),
1174 /* Find the maximum amount of memory that can be allocated */
1175 DosAllocateMemory(0xFFFF, &MaxAllocSize
);
1177 /* Make sure it's enough for the whole program and the PSP */
1178 if (((DWORD
)MaxAllocSize
<< 4) < (FileSize
+ sizeof(DOS_PSP
))) goto Cleanup
;
1180 /* Allocate all of it */
1181 Segment
= DosAllocateMemory(MaxAllocSize
, NULL
);
1182 if (Segment
== 0) goto Cleanup
;
1184 /* The process owns its own memory */
1185 DosChangeMemoryOwner(Segment
, Segment
);
1186 DosChangeMemoryOwner(EnvBlock
, Segment
);
1188 /* Copy the program to Segment:0100 */
1189 RtlCopyMemory(SEG_OFF_TO_PTR(Segment
, 0x100),
1193 /* Initialize the PSP */
1194 DosInitializePsp(Segment
,
1196 (WORD
)((FileSize
+ sizeof(DOS_PSP
)) >> 4),
1199 /* Set the initial segment registers */
1203 /* Set the stack to the last word of the segment */
1204 EmulatorSetStack(Segment
, 0xFFFE);
1207 CurrentPsp
= Segment
;
1208 DiskTransferArea
= MAKELONG(0x80, Segment
);
1209 EmulatorExecute(Segment
, 0x100);
1217 /* It was not successful, cleanup the DOS memory */
1218 if (AllocatedEnvBlock
) DosFreeMemory(EnvBlock
);
1219 if (Segment
) DosFreeMemory(Segment
);
1223 if (Address
!= NULL
) UnmapViewOfFile(Address
);
1225 /* Close the file mapping object */
1226 if (FileMapping
!= NULL
) CloseHandle(FileMapping
);
1228 /* Close the file handle */
1229 if (FileHandle
!= INVALID_HANDLE_VALUE
) CloseHandle(FileHandle
);
1234 VOID
DosTerminateProcess(WORD Psp
, BYTE ReturnCode
)
1237 WORD McbSegment
= FIRST_MCB_SEGMENT
;
1238 PDOS_MCB CurrentMcb
;
1239 LPDWORD IntVecTable
= (LPDWORD
)((ULONG_PTR
)BaseAddress
);
1240 PDOS_PSP PspBlock
= SEGMENT_TO_PSP(Psp
);
1242 DPRINT("DosTerminateProcess: Psp 0x%04X, ReturnCode 0x%02X\n",
1246 /* Check if this PSP is it's own parent */
1247 if (PspBlock
->ParentPsp
== Psp
) goto Done
;
1249 for (i
= 0; i
< PspBlock
->HandleTableSize
; i
++)
1251 /* Close the handle */
1255 /* Free the memory used by the process */
1258 /* Get a pointer to the MCB */
1259 CurrentMcb
= SEGMENT_TO_MCB(McbSegment
);
1261 /* Make sure the MCB is valid */
1262 if (CurrentMcb
->BlockType
!= 'M' && CurrentMcb
->BlockType
!='Z') break;
1264 /* If this block was allocated by the process, free it */
1265 if (CurrentMcb
->OwnerPsp
== Psp
) DosFreeMemory(McbSegment
+ 1);
1267 /* If this was the last block, quit */
1268 if (CurrentMcb
->BlockType
== 'Z') break;
1270 /* Update the segment and continue */
1271 McbSegment
+= CurrentMcb
->Size
+ 1;
1275 /* Restore the interrupt vectors */
1276 IntVecTable
[0x22] = PspBlock
->TerminateAddress
;
1277 IntVecTable
[0x23] = PspBlock
->BreakAddress
;
1278 IntVecTable
[0x24] = PspBlock
->CriticalAddress
;
1280 /* Update the current PSP */
1281 if (Psp
== CurrentPsp
)
1283 CurrentPsp
= PspBlock
->ParentPsp
;
1284 if (CurrentPsp
== SYSTEM_PSP
) VdmRunning
= FALSE
;
1287 /* Save the return code - Normal termination */
1288 DosErrorLevel
= MAKEWORD(ReturnCode
, 0x00);
1290 /* Return control to the parent process */
1291 EmulatorExecute(HIWORD(PspBlock
->TerminateAddress
),
1292 LOWORD(PspBlock
->TerminateAddress
));
1295 CHAR
DosReadCharacter(VOID
)
1297 CHAR Character
= '\0';
1300 if (IsConsoleHandle(DosGetRealHandle(DOS_INPUT_HANDLE
)))
1303 Character
= LOBYTE(BiosGetCharacter());
1307 /* Use the file reading function */
1308 DosReadFile(DOS_INPUT_HANDLE
, &Character
, sizeof(CHAR
), &BytesRead
);
1314 BOOLEAN
DosCheckInput(VOID
)
1316 HANDLE Handle
= DosGetRealHandle(DOS_INPUT_HANDLE
);
1318 if (IsConsoleHandle(Handle
))
1321 return (BiosPeekCharacter() != 0xFFFF);
1326 DWORD FileSize
= GetFileSize(Handle
, &FileSizeHigh
);
1327 LONG LocationHigh
= 0;
1328 DWORD Location
= SetFilePointer(Handle
, 0, &LocationHigh
, FILE_CURRENT
);
1330 return ((Location
!= FileSize
) || (LocationHigh
!= FileSizeHigh
));
1334 VOID
DosPrintCharacter(CHAR Character
)
1338 /* Use the file writing function */
1339 DosWriteFile(DOS_OUTPUT_HANDLE
, &Character
, sizeof(CHAR
), &BytesWritten
);
1342 BOOLEAN
DosHandleIoctl(BYTE ControlCode
, WORD FileHandle
)
1344 HANDLE Handle
= DosGetRealHandle(FileHandle
);
1346 if (Handle
== INVALID_HANDLE_VALUE
)
1349 DosLastError
= ERROR_FILE_NOT_FOUND
;
1353 switch (ControlCode
)
1355 /* Get Device Information */
1360 if (Handle
== DosSystemFileTable
[0])
1365 else if (Handle
== DosSystemFileTable
[1])
1367 /* Console output */
1371 /* It is a character device */
1374 /* Return the device information word */
1379 /* Unsupported control code */
1382 DPRINT1("Unsupported IOCTL: 0x%02X\n", ControlCode
);
1384 DosLastError
= ERROR_INVALID_PARAMETER
;
1390 VOID
DosInt20h(LPWORD Stack
)
1392 /* This is the exit interrupt */
1393 DosTerminateProcess(Stack
[STACK_CS
], 0);
1396 VOID
DosInt21h(LPWORD Stack
)
1399 SYSTEMTIME SystemTime
;
1401 PDOS_INPUT_BUFFER InputBuffer
;
1403 /* Check the value in the AH register */
1406 /* Terminate Program */
1409 DosTerminateProcess(Stack
[STACK_CS
], 0);
1413 /* Read Character from STDIN with Echo */
1416 Character
= DosReadCharacter();
1417 DosPrintCharacter(Character
);
1419 /* Let the BOP repeat if needed */
1426 /* Write Character to STDOUT */
1429 Character
= getDL();
1430 DosPrintCharacter(Character
);
1433 * We return the output character (DOS 2.1+).
1434 * Also, if we're going to output a TAB, then
1435 * don't return a TAB but a SPACE instead.
1436 * See Ralf Brown: http://www.ctyme.com/intr/rb-2554.htm
1437 * for more information.
1439 setAL(Character
== '\t' ? ' ' : Character
);
1443 /* Read Character from STDAUX */
1446 // FIXME: Really read it from STDAUX!
1447 DPRINT1("INT 16h, 03h: Read character from STDAUX is HALFPLEMENTED\n");
1448 setAL(DosReadCharacter());
1452 /* Write Character to STDAUX */
1455 // FIXME: Really write it to STDAUX!
1456 DPRINT1("INT 16h, 04h: Write character to STDAUX is HALFPLEMENTED\n");
1457 DosPrintCharacter(getDL());
1461 /* Write Character to Printer */
1464 // FIXME: Really write it to printer!
1465 DPRINT1("INT 16h, 05h: Write character to printer is HALFPLEMENTED -\n\n");
1466 DPRINT1("0x%p\n", getDL());
1467 DPRINT1("\n\n-----------\n\n");
1471 /* Direct Console I/O */
1474 Character
= getDL();
1476 if (Character
!= 0xFF)
1479 DosPrintCharacter(Character
);
1482 * We return the output character (DOS 2.1+).
1483 * See Ralf Brown: http://www.ctyme.com/intr/rb-2558.htm
1484 * for more information.
1491 if (DosCheckInput())
1493 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_ZF
;
1494 setAL(DosReadCharacter());
1498 /* No character available */
1499 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_ZF
;
1507 /* Character Input without Echo */
1511 Character
= DosReadCharacter();
1513 /* Let the BOP repeat if needed */
1520 /* Write string to STDOUT */
1523 String
= (PCHAR
)SEG_OFF_TO_PTR(getDS(), getDX());
1525 while (*String
!= '$')
1527 DosPrintCharacter(*String
);
1532 * We return the terminating character (DOS 2.1+).
1533 * See Ralf Brown: http://www.ctyme.com/intr/rb-2562.htm
1534 * for more information.
1540 /* Read Buffered Input */
1543 InputBuffer
= (PDOS_INPUT_BUFFER
)SEG_OFF_TO_PTR(getDS(), getDX());
1545 while (Stack
[STACK_COUNTER
] < InputBuffer
->MaxLength
)
1547 /* Try to read a character */
1548 Character
= DosReadCharacter();
1550 /* If it's not ready yet, let the BOP repeat */
1553 /* Echo the character and append it to the buffer */
1554 DosPrintCharacter(Character
);
1555 InputBuffer
->Buffer
[Stack
[STACK_COUNTER
]] = Character
;
1557 if (Character
== '\r') break;
1558 Stack
[STACK_COUNTER
]++;
1561 /* Update the length */
1562 InputBuffer
->Length
= Stack
[STACK_COUNTER
];
1566 /* Get STDIN Status */
1569 setAL(DosCheckInput() ? 0xFF : 0x00);
1573 /* Flush Buffer and Read STDIN */
1576 BYTE InputFunction
= getAL();
1578 /* Flush STDIN buffer */
1579 DosFlushFileBuffers(DOS_INPUT_HANDLE
); // Maybe just create a DosFlushInputBuffer...
1582 * If the input function number contained in AL is valid, i.e.
1583 * AL == 0x01 or 0x06 or 0x07 or 0x08 or 0x0A, call ourselves
1584 * recursively with AL == AH.
1586 if (InputFunction
== 0x01 || InputFunction
== 0x06 ||
1587 InputFunction
== 0x07 || InputFunction
== 0x08 ||
1588 InputFunction
== 0x0A)
1590 setAH(InputFunction
);
1592 * Instead of calling ourselves really recursively as in:
1594 * prefer resetting the CF flag to let the BOP repeat.
1604 PDOS_PSP PspBlock
= SEGMENT_TO_PSP(CurrentPsp
);
1606 // TODO: Flush what's needed.
1607 DPRINT1("INT 21h, 0Dh is UNIMPLEMENTED\n");
1609 /* Clear CF in DOS 6 only */
1610 if (PspBlock
->DosVersion
== 0x0006)
1611 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
1616 /* Set Default Drive */
1619 DosChangeDrive(getDL());
1620 setAL(LastDrive
- 'A' + 1);
1624 /* NULL Function for CP/M Compatibility */
1628 * This function corresponds to the CP/M BDOS function
1629 * "get bit map of logged drives", which is meaningless
1632 * For: PTS-DOS 6.51 & S/DOS 1.0 - EXTENDED RENAME FILE USING FCB
1633 * See Ralf Brown: http://www.ctyme.com/intr/rb-2584.htm
1634 * for more information.
1640 /* Get Default Drive */
1643 setAL(CurrentDrive
);
1647 /* Set Disk Transfer Area */
1650 DiskTransferArea
= MAKELONG(getDX(), getDS());
1654 /* NULL Function for CP/M Compatibility */
1659 * Function 0x1D corresponds to the CP/M BDOS function
1660 * "get bit map of read-only drives", which is meaningless
1662 * See Ralf Brown: http://www.ctyme.com/intr/rb-2592.htm
1663 * for more information.
1665 * Function 0x1E corresponds to the CP/M BDOS function
1666 * "set file attributes", which was meaningless under MS-DOS 1.x.
1667 * See Ralf Brown: http://www.ctyme.com/intr/rb-2593.htm
1668 * for more information.
1674 /* NULL Function for CP/M Compatibility */
1678 * This function corresponds to the CP/M BDOS function
1679 * "get/set default user (sublibrary) number", which is meaningless
1682 * For: S/DOS 1.0+ & PTS-DOS 6.51+ - GET OEM REVISION
1683 * See Ralf Brown: http://www.ctyme.com/intr/rb-2596.htm
1684 * for more information.
1690 /* Set Interrupt Vector */
1693 DWORD FarPointer
= MAKELONG(getDX(), getDS());
1695 /* Write the new far pointer to the IDT */
1696 ((PDWORD
)BaseAddress
)[getAL()] = FarPointer
;
1700 /* Create New PSP */
1703 DPRINT1("INT 21h, 26h - Create New PSP is UNIMPLEMENTED\n");
1707 /* Get System Date */
1710 GetLocalTime(&SystemTime
);
1711 setCX(SystemTime
.wYear
);
1712 setDX(MAKEWORD(SystemTime
.wDay
, SystemTime
.wMonth
));
1713 setAL(SystemTime
.wDayOfWeek
);
1717 /* Set System Date */
1720 GetLocalTime(&SystemTime
);
1721 SystemTime
.wYear
= getCX();
1722 SystemTime
.wMonth
= getDH();
1723 SystemTime
.wDay
= getDL();
1725 /* Return success or failure */
1726 setAL(SetLocalTime(&SystemTime
) ? 0x00 : 0xFF);
1730 /* Get System Time */
1733 GetLocalTime(&SystemTime
);
1734 setCX(MAKEWORD(SystemTime
.wMinute
, SystemTime
.wHour
));
1735 setDX(MAKEWORD(SystemTime
.wMilliseconds
/ 10, SystemTime
.wSecond
));
1739 /* Set System Time */
1742 GetLocalTime(&SystemTime
);
1743 SystemTime
.wHour
= getCH();
1744 SystemTime
.wMinute
= getCL();
1745 SystemTime
.wSecond
= getDH();
1746 SystemTime
.wMilliseconds
= getDL() * 10; // In hundredths of seconds
1748 /* Return success or failure */
1749 setAL(SetLocalTime(&SystemTime
) ? 0x00 : 0xFF);
1753 /* Get Disk Transfer Area */
1756 setES(HIWORD(DiskTransferArea
));
1757 setBX(LOWORD(DiskTransferArea
));
1761 /* Get DOS Version */
1764 PDOS_PSP PspBlock
= SEGMENT_TO_PSP(CurrentPsp
);
1767 * See Ralf Brown: http://www.ctyme.com/intr/rb-2711.htm
1768 * for more information.
1771 if (LOBYTE(PspBlock
->DosVersion
) < 5 || getAL() == 0x00)
1774 * Return DOS OEM number:
1775 * 0x00 for IBM PC-DOS
1776 * 0x02 for packaged MS-DOS
1781 if (LOBYTE(PspBlock
->DosVersion
) >= 5 && getAL() == 0x01)
1784 * Return version flag:
1785 * 1 << 3 if DOS is in ROM,
1786 * 0 (reserved) if not.
1791 /* Return DOS 24-bit user serial number in BL:CX */
1795 /* Return DOS version: Minor:Major in AH:AL */
1796 setAX(PspBlock
->DosVersion
);
1801 /* Get Interrupt Vector */
1804 DWORD FarPointer
= ((PDWORD
)BaseAddress
)[getAL()];
1806 /* Read the address from the IDT into ES:BX */
1807 setES(HIWORD(FarPointer
));
1808 setBX(LOWORD(FarPointer
));
1812 /* SWITCH character - AVAILDEV */
1815 if (getAL() == 0x00)
1818 * DOS 2+ - "SWITCHAR" - GET SWITCH CHARACTER
1819 * This setting is ignored by MS-DOS 4.0+.
1820 * MS-DOS 5+ always return AL=00h/DL=2Fh.
1821 * See Ralf Brown: http://www.ctyme.com/intr/rb-2752.htm
1822 * for more information.
1827 else if (getAL() == 0x01)
1830 * DOS 2+ - "SWITCHAR" - SET SWITCH CHARACTER
1831 * This setting is ignored by MS-DOS 5+.
1832 * See Ralf Brown: http://www.ctyme.com/intr/rb-2753.htm
1833 * for more information.
1838 else if (getAL() == 0x02)
1841 * DOS 2.x and 3.3+ only - "AVAILDEV" - SPECIFY \DEV\ PREFIX USE
1842 * See Ralf Brown: http://www.ctyme.com/intr/rb-2754.htm
1843 * for more information.
1848 else if (getAL() == 0x03)
1851 * DOS 2.x and 3.3+ only - "AVAILDEV" - SPECIFY \DEV\ PREFIX USE
1852 * See Ralf Brown: http://www.ctyme.com/intr/rb-2754.htm
1853 * for more information.
1866 /* Create Directory */
1869 String
= (PCHAR
)SEG_OFF_TO_PTR(getDS(), getDX());
1871 if (CreateDirectoryA(String
, NULL
))
1873 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
1877 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
1878 setAX(LOWORD(GetLastError()));
1884 /* Remove Directory */
1887 String
= (PCHAR
)SEG_OFF_TO_PTR(getDS(), getDX());
1889 if (RemoveDirectoryA(String
))
1891 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
1895 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
1896 setAX(LOWORD(GetLastError()));
1902 /* Set Current Directory */
1905 String
= (PCHAR
)SEG_OFF_TO_PTR(getDS(), getDX());
1907 if (DosChangeDirectory(String
))
1909 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
1913 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
1914 setAX(DosLastError
);
1924 WORD ErrorCode
= DosCreateFile(&FileHandle
,
1925 (LPCSTR
)SEG_OFF_TO_PTR(getDS(), getDX()),
1930 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
1935 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
1946 WORD ErrorCode
= DosOpenFile(&FileHandle
,
1947 (LPCSTR
)SEG_OFF_TO_PTR(getDS(), getDX()),
1952 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
1957 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
1967 if (DosCloseHandle(getBX()))
1969 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
1973 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
1974 setAX(ERROR_INVALID_HANDLE
);
1980 /* Read from File or Device */
1983 WORD Handle
= getBX();
1984 LPBYTE Buffer
= (LPBYTE
)SEG_OFF_TO_PTR(getDS(), getDX());
1985 WORD Count
= getCX();
1987 WORD ErrorCode
= ERROR_SUCCESS
;
1989 if (IsConsoleHandle(DosGetRealHandle(Handle
)))
1991 while (Stack
[STACK_COUNTER
] < Count
)
1993 /* Read a character from the BIOS */
1994 // FIXME: Security checks!
1995 Buffer
[Stack
[STACK_COUNTER
]] = LOBYTE(BiosGetCharacter());
1997 /* Stop if the BOP needs to be repeated */
2000 /* Increment the counter */
2001 Stack
[STACK_COUNTER
]++;
2004 if (Stack
[STACK_COUNTER
] < Count
)
2005 ErrorCode
= ERROR_NOT_READY
;
2011 /* Use the file reading function */
2012 ErrorCode
= DosReadFile(Handle
, Buffer
, Count
, &BytesRead
);
2015 if (ErrorCode
== ERROR_SUCCESS
)
2017 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2020 else if (ErrorCode
!= ERROR_NOT_READY
)
2022 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2028 /* Write to File or Device */
2031 WORD BytesWritten
= 0;
2032 WORD ErrorCode
= DosWriteFile(getBX(),
2033 SEG_OFF_TO_PTR(getDS(), getDX()),
2037 if (ErrorCode
== ERROR_SUCCESS
)
2039 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2040 setAX(BytesWritten
);
2044 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2054 LPSTR FileName
= (LPSTR
)SEG_OFF_TO_PTR(getDS(), getDX());
2056 /* Call the API function */
2057 if (DeleteFileA(FileName
))
2059 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2061 * See Ralf Brown: http://www.ctyme.com/intr/rb-2797.htm
2062 * "AX destroyed (DOS 3.3) AL seems to be drive of deleted file."
2064 setAL(FileName
[0] - 'A');
2068 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2069 setAX(GetLastError());
2079 WORD ErrorCode
= DosSeekFile(getBX(),
2080 MAKELONG(getDX(), getCX()),
2084 if (ErrorCode
== ERROR_SUCCESS
)
2086 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2088 /* Return the new offset in DX:AX */
2089 setDX(HIWORD(NewLocation
));
2090 setAX(LOWORD(NewLocation
));
2094 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2101 /* Get/Set File Attributes */
2105 LPSTR FileName
= (LPSTR
)SEG_OFF_TO_PTR(getDS(), getDX());
2107 if (getAL() == 0x00)
2109 /* Get the attributes */
2110 Attributes
= GetFileAttributesA(FileName
);
2112 /* Check if it failed */
2113 if (Attributes
== INVALID_FILE_ATTRIBUTES
)
2115 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2116 setAX(GetLastError());
2120 /* Return the attributes that DOS can understand */
2121 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2122 setCX(Attributes
& 0x00FF);
2125 else if (getAL() == 0x01)
2127 /* Try to set the attributes */
2128 if (SetFileAttributesA(FileName
, getCL()))
2130 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2134 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2135 setAX(GetLastError());
2140 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2141 setAX(ERROR_INVALID_FUNCTION
);
2150 if (DosHandleIoctl(getAL(), getBX()))
2152 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2156 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2157 setAX(DosLastError
);
2163 /* Duplicate Handle */
2167 HANDLE Handle
= DosGetRealHandle(getBX());
2169 if (Handle
!= INVALID_HANDLE_VALUE
)
2171 /* The handle is invalid */
2172 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2173 setAX(ERROR_INVALID_HANDLE
);
2177 /* Open a new handle to the same entry */
2178 NewHandle
= DosOpenHandle(Handle
);
2180 if (NewHandle
== INVALID_DOS_HANDLE
)
2182 /* Too many files open */
2183 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2184 setAX(ERROR_TOO_MANY_OPEN_FILES
);
2188 /* Return the result */
2189 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2194 /* Force Duplicate Handle */
2197 if (DosDuplicateHandle(getBX(), getCX()))
2199 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2203 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2204 setAX(ERROR_INVALID_HANDLE
);
2210 /* Get Current Directory */
2213 BYTE DriveNumber
= getDL();
2214 String
= (PCHAR
)SEG_OFF_TO_PTR(getDS(), getSI());
2216 /* Get the real drive number */
2217 if (DriveNumber
== 0)
2219 DriveNumber
= CurrentDrive
;
2223 /* Decrement DriveNumber since it was 1-based */
2227 if (DriveNumber
<= LastDrive
- 'A')
2230 * Copy the current directory into the target buffer.
2231 * It doesn't contain the drive letter and the backslash.
2233 strncpy(String
, CurrentDirectories
[DriveNumber
], DOS_DIR_LENGTH
);
2234 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2235 setAX(0x0100); // Undocumented, see Ralf Brown: http://www.ctyme.com/intr/rb-2933.htm
2239 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2240 setAX(ERROR_INVALID_DRIVE
);
2246 /* Allocate Memory */
2249 WORD MaxAvailable
= 0;
2250 WORD Segment
= DosAllocateMemory(getBX(), &MaxAvailable
);
2254 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2259 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2260 setAX(DosLastError
);
2261 setBX(MaxAvailable
);
2270 if (DosFreeMemory(getES()))
2272 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2276 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2277 setAX(ERROR_ARENA_TRASHED
);
2283 /* Resize Memory Block */
2288 if (DosResizeMemory(getES(), getBX(), &Size
))
2290 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2294 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2295 setAX(DosLastError
);
2302 /* Terminate With Return Code */
2305 DosTerminateProcess(CurrentPsp
, getAL());
2309 /* Get Return Code (ERRORLEVEL) */
2313 * According to Ralf Brown: http://www.ctyme.com/intr/rb-2976.htm
2314 * DosErrorLevel is cleared after being read by this function.
2316 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2317 setAX(DosErrorLevel
);
2318 DosErrorLevel
= 0x0000; // Clear it
2322 /* Internal - Set Current Process ID (Set PSP Address) */
2325 // FIXME: Is it really what it's done ??
2326 CurrentPsp
= getBX();
2330 /* Get Current Process ID (Get PSP Address) */
2337 /* Get/Set Memory Management Options */
2340 if (getAL() == 0x00)
2342 /* Get allocation strategy */
2343 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2344 setAX(DosAllocStrategy
);
2346 else if (getAL() == 0x01)
2348 /* Set allocation strategy */
2350 if ((getBL() & (DOS_ALLOC_HIGH
| DOS_ALLOC_HIGH_LOW
))
2351 == (DOS_ALLOC_HIGH
| DOS_ALLOC_HIGH_LOW
))
2353 /* Can't set both */
2354 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2355 setAX(ERROR_INVALID_PARAMETER
);
2359 if ((getBL() & 0x3F) > DOS_ALLOC_LAST_FIT
)
2361 /* Invalid allocation strategy */
2362 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2363 setAX(ERROR_INVALID_PARAMETER
);
2367 DosAllocStrategy
= getBL();
2368 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2370 else if (getAL() == 0x02)
2372 /* Get UMB link state */
2373 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2374 setAL(DosUmbLinked
? 0x01 : 0x00);
2376 else if (getAL() == 0x03)
2378 /* Set UMB link state */
2379 if (getBX()) DosLinkUmb();
2380 else DosUnlinkUmb();
2381 Stack
[STACK_FLAGS
] &= ~EMULATOR_FLAG_CF
;
2385 /* Invalid or unsupported function */
2386 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2387 setAX(ERROR_INVALID_FUNCTION
);
2396 DPRINT1("DOS Function INT 0x21, AH = 0x%02X NOT IMPLEMENTED!\n", getAH());
2397 Stack
[STACK_FLAGS
] |= EMULATOR_FLAG_CF
;
2402 VOID
DosBreakInterrupt(LPWORD Stack
)
2404 UNREFERENCED_PARAMETER(Stack
);
2409 BOOLEAN
DosInitialize(VOID
)
2412 PDOS_MCB Mcb
= SEGMENT_TO_MCB(FIRST_MCB_SEGMENT
);
2415 LPWSTR SourcePtr
, Environment
;
2417 LPSTR DestPtr
= (LPSTR
)SEG_OFF_TO_PTR(SYSTEM_ENV_BLOCK
, 0);
2419 CHAR CurrentDirectory
[MAX_PATH
];
2420 CHAR DosDirectory
[DOS_DIR_LENGTH
];
2423 /* Initialize the MCB */
2424 Mcb
->BlockType
= 'Z';
2425 Mcb
->Size
= USER_MEMORY_SIZE
;
2428 /* Initialize the link MCB to the UMB area */
2429 Mcb
= SEGMENT_TO_MCB(FIRST_MCB_SEGMENT
+ USER_MEMORY_SIZE
+ 1);
2430 Mcb
->BlockType
= 'M';
2431 Mcb
->Size
= UMB_START_SEGMENT
- FIRST_MCB_SEGMENT
- USER_MEMORY_SIZE
- 2;
2432 Mcb
->OwnerPsp
= SYSTEM_PSP
;
2434 /* Initialize the UMB area */
2435 Mcb
= SEGMENT_TO_MCB(UMB_START_SEGMENT
);
2436 Mcb
->BlockType
= 'Z';
2437 Mcb
->Size
= UMB_END_SEGMENT
- UMB_START_SEGMENT
;
2440 /* Get the environment strings */
2441 SourcePtr
= Environment
= GetEnvironmentStringsW();
2442 if (Environment
== NULL
) return FALSE
;
2444 /* Fill the DOS system environment block */
2447 /* Get the size of the ASCII string */
2448 AsciiSize
= WideCharToMultiByte(CP_ACP
,
2457 /* Allocate memory for the ASCII string */
2458 AsciiString
= HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY
, AsciiSize
);
2459 if (AsciiString
== NULL
)
2461 FreeEnvironmentStringsW(Environment
);
2465 /* Convert to ASCII */
2466 WideCharToMultiByte(CP_ACP
,
2475 /* Copy the string into DOS memory */
2476 strcpy(DestPtr
, AsciiString
);
2478 /* Move to the next string */
2479 SourcePtr
+= wcslen(SourcePtr
) + 1;
2480 DestPtr
+= strlen(AsciiString
);
2483 /* Free the memory */
2484 HeapFree(GetProcessHeap(), 0, AsciiString
);
2488 /* Free the memory allocated for environment strings */
2489 FreeEnvironmentStringsW(Environment
);
2491 /* Clear the current directory buffer */
2492 ZeroMemory(CurrentDirectories
, sizeof(CurrentDirectories
));
2494 /* Get the current directory */
2495 if (!GetCurrentDirectoryA(MAX_PATH
, CurrentDirectory
))
2497 // TODO: Use some kind of default path?
2501 /* Convert that to a DOS path */
2502 if (!GetShortPathNameA(CurrentDirectory
, DosDirectory
, DOS_DIR_LENGTH
))
2504 // TODO: Use some kind of default path?
2509 CurrentDrive
= DosDirectory
[0] - 'A';
2511 /* Get the directory part of the path */
2512 Path
= strchr(DosDirectory
, '\\');
2515 /* Skip the backslash */
2519 /* Set the directory */
2522 strncpy(CurrentDirectories
[CurrentDrive
], Path
, DOS_DIR_LENGTH
);
2525 /* Read CONFIG.SYS */
2526 Stream
= _wfopen(DOS_CONFIG_PATH
, L
"r");
2529 while (fgetws(Buffer
, 256, Stream
))
2531 // TODO: Parse the line
2536 /* Initialize the SFT */
2537 for (i
= 0; i
< DOS_SFT_SIZE
; i
++)
2539 DosSystemFileTable
[i
] = INVALID_HANDLE_VALUE
;
2540 DosSftRefCount
[i
] = 0;
2543 /* Get handles to standard I/O devices */
2544 DosSystemFileTable
[0] = GetStdHandle(STD_INPUT_HANDLE
);
2545 DosSystemFileTable
[1] = GetStdHandle(STD_OUTPUT_HANDLE
);
2546 DosSystemFileTable
[2] = GetStdHandle(STD_ERROR_HANDLE
);