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source: xtideuniversalbios/trunk/Assembly_Library/Src/Menu/Dialog/DialogFile.asm@ 595

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Last change on this file since 595 was 593, checked in by Tomi Tilli, 6 years ago
Flashing now works again. Hack to get Windows 95 to work properly (MODULE_WIN95_CMOS_HACK included for 386 builds by default). Edited makefile to produce large 386 build. Fixed recovery time for QDI Vision VLB-IDE controllers. No more warnings with Nasm 2.13.xx and later. File dialog now properly restores default drive when file selection is cancelled.
File size: 23.9 KB

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1	; Project name : Assembly Library
2	; Description : Displays file dialog.
3
4	;
5	; XTIDE Universal BIOS and Associated Tools
6	; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
7	;
8	; This program is free software; you can redistribute it and/or modify
9	; it under the terms of the GNU General Public License as published by
10	; the Free Software Foundation; either version 2 of the License, or
11	; (at your option) any later version.
12	;
13	; This program is distributed in the hope that it will be useful,
14	; but WITHOUT ANY WARRANTY; without even the implied warranty of
15	; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	; GNU General Public License for more details.
17	; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
18	;
19
20	CURRENTDIR_CHARACTERS EQU 002Eh
21	UPDIR_CHARACTERS EQU 2E2Eh
22
23	; Section containing code
24	SECTION .text
25
26	;--------------------------------------------------------------------
27	; DialogFile_GetFileNameWithIoInDSSI
28	; Parameters:
29	; DS:SI: Ptr to FILE_DIALOG_IO
30	; SS:BP: Ptr to parent MENU
31	; Returns:
32	; Nothing
33	; Corrupts registers:
34	; AX, BX, CX, DX, DI
35	;--------------------------------------------------------------------
36	ALIGN JUMP_ALIGN
37	DialogFile_GetFileNameWithIoInDSSI:
38	; We need to store default drive because user might change drive but
39	; then cancel the file selection. In that case the original default directory
40	; must be restored.
41	call Drive_GetDefaultToAL
42	push ax
43
44	mov bx, FileEventHandler
45	mov BYTE [si+FILE_DIALOG_IO.bUserCancellation], TRUE
46	call Dialog_DisplayWithDialogInputInDSSIandHandlerInBX
47
48	; Now restore the default drive if user cancellation
49	pop dx
50	cmp BYTE [si+FILE_DIALOG_IO.bUserCancellation], TRUE
51	je Drive_SetDefaultFromDL
52	ret
53
54
55	;--------------------------------------------------------------------
56	; FileEventHandler
57	; Common parameters for all events:
58	; BX: Menu event (anything from MENUEVENT struct)
59	; SS:BP: Ptr to DIALOG
60	; Common return values for all events:
61	; CF: Set if event processed
62	; Cleared if event not processed
63	; Corrupts registers:
64	; All
65	;--------------------------------------------------------------------
66	ALIGN JUMP_ALIGN
67	FileEventHandler:
68	jmp [cs:bx+.rgfnEventHandlers]
69
70
71	ALIGN JUMP_ALIGN
72	.ItemSelectedFromCX:
73	call LoadItemStringBufferToESDI
74	call Registers_CopyESDItoDSSI
75	call ItemLineSplitter_GetLineToDSSIandLengthToCXfromStringInDSSIwithIndexInCX
76	jmp ParseSelectionFromItemLineInDSSI
77
78
79	ALIGN JUMP_ALIGN
80	.RefreshInformation:
81	call GetInfoLinesToCXandDialogFlagsToAX
82	mov si, [cs:.rgszInfoStringLookup]
83	xor bx, bx
84	xchg dx, ax
85	ALIGN JUMP_ALIGN
86	.InfoLineLoop:
87	shr dl, 1
88	jnc SHORT .CheckNextFlag
89	mov si, [cs:bx+.rgszInfoStringLookup]
90	push bx
91	CALL_DISPLAY_LIBRARY PrintNullTerminatedStringFromCSSI
92	pop bx
93	ALIGN JUMP_ALIGN
94	.CheckNextFlag:
95	inc bx
96	inc bx
97	loop .InfoLineLoop
98	stc ; Event processed
99	ret
100
101
102	ALIGN JUMP_ALIGN
103	.RefreshItemFromCX:
104	call LoadItemStringBufferToESDI
105	mov ax, FILE_STRING_LENGTH
106	xchg ax, cx
107	mul cx
108	add di, ax
109	mov si, di
110	mov bx, es
111	dec cx ; Do not print LF at the end of file string
112	CALL_DISPLAY_LIBRARY PrintCharBufferFromBXSIwithLengthInCX
113	stc
114	ret
115
116
117	ALIGN WORD_ALIGN
118	.rgszInfoStringLookup:
119	dw g_szChangeDrive
120	dw g_szSelectDirectory
121	dw g_szCreateNew
122
123	.rgfnEventHandlers:
124	istruc MENUEVENT
125	at MENUEVENT.InitializeMenuinitFromDSSI, dw InitializeMenuinitFromSSBP
126	at MENUEVENT.ExitMenu, dw Dialog_EventExitMenu
127	at MENUEVENT.IdleProcessing, dw Dialog_EventNotHandled
128	at MENUEVENT.ItemHighlightedFromCX, dw Dialog_EventNotHandled
129	at MENUEVENT.ItemSelectedFromCX, dw .ItemSelectedFromCX
130	at MENUEVENT.KeyStrokeInAX, dw HandleFunctionKeyFromAH
131	at MENUEVENT.RefreshTitle, dw Dialog_EventRefreshTitle
132	at MENUEVENT.RefreshInformation, dw .RefreshInformation
133	at MENUEVENT.RefreshItemFromCX, dw .RefreshItemFromCX
134	iend
135
136
137	;--------------------------------------------------------------------
138	; ReInitializeMenuinitFromSSBP
139	; InitializeMenuinitFromSSBP
140	; Parameters:
141	; SS:BP: Ptr to DIALOG
142	; Returns:
143	; Nothing
144	; Corrupts registers:
145	; All, except BP
146	;--------------------------------------------------------------------
147	ALIGN JUMP_ALIGN
148	ReInitializeMenuinitFromSSBP:
149	call DisplayLoadingMessageInInformationArea
150	InitializeMenuinitFromSSBP:
151	call LoadItemStringBufferToESDI
152	call CreateStringFromCurrentDirectoryContentsToESDI
153	call LoadItemStringBufferToESDI
154	call SortDirectoryContentsStringFromESDIwithCountInCX
155	call RemoveLastLFandTerminateESDIwithNull
156
157	call Registers_CopySSBPtoDSSI
158	xor ax, ax
159	call Dialog_EventInitializeMenuinitFromDSSIwithHighlightedItemInAX
160	call GetInfoLinesToCXandDialogFlagsToAX
161	mov [bp+MENUINIT.bInfoLines], cl
162	CALL_DISPLAY_LIBRARY GetColumnsToALandRowsToAH
163	mov [bp+MENUINIT.bHeight], ah ; Always max height
164	mov WORD [bp+MENU.wFirstVisibleItem], 0
165	ret
166
167
168	;--------------------------------------------------------------------
169	; LoadItemStringBufferToESDI
170	; Parameters:
171	; SS:BP: Ptr to DIALOG
172	; Returns:
173	; ES:DI: Ptr to item string buffer
174	; Corrupts registers:
175	; Nothing
176	;--------------------------------------------------------------------
177	ALIGN JUMP_ALIGN
178	LoadItemStringBufferToESDI:
179	les di, [bp+DIALOG.fpDialogIO]
180	les di, [es:di+FILE_DIALOG_IO.fszItemBuffer]
181	ret
182
183
184	;--------------------------------------------------------------------
185	; CreateStringFromCurrentDirectoryContentsToESDI
186	; Parameters:
187	; ES:DI: Buffer where to create item string
188	; SS:BP: Ptr to DIALOG
189	; Returns:
190	; CX: Number of files or directories found
191	; Corrupts registers:
192	; AX, BX, DX, SI, DI, DS
193	;--------------------------------------------------------------------
194	ALIGN JUMP_ALIGN
195	CreateStringFromCurrentDirectoryContentsToESDI:
196	mov bx, di
197	CALL_DISPLAY_LIBRARY PushDisplayContext
198	mov cx, -1
199	CALL_DISPLAY_LIBRARY PrepareOffScreenBufferInESBXwithLengthInCX ; ES:DI now points to buffer
200
201	lds si, [bp+DIALOG.fpDialogIO]
202	eMOVZX cx, [si+FILE_DIALOG_IO.bFileAttributes]
203	lds si, [si+FILE_DIALOG_IO.fpFileFilterString]
204	call Directory_UpdateDTAForFirstMatchForDSSIwithAttributesInCX
205
206	call .ClearDLifInRootDirectory
207	call Directory_GetDiskTransferAreaAddressToDSSI
208	xor cx, cx ; Clear file/directory count
209	call .FindMatchingFilesAndPrintThemToOffScreenBuffer
210
211	JMP_DISPLAY_LIBRARY PopDisplayContext
212
213	;--------------------------------------------------------------------
214	; .ClearDLifInRootDirectory
215	; Parameters:
216	; SS:BP: Ptr to DIALOG
217	; ES:DI: Ptr to destination string buffer
218	; Returns:
219	; DL: Cleared if in root directory
220	; Set if in any other directory
221	; Corrupts registers:
222	; AX, SI, DS
223	;--------------------------------------------------------------------
224	ALIGN JUMP_ALIGN
225	.ClearDLifInRootDirectory:
226	call Registers_CopyESDItoDSSI
227	call Directory_WriteCurrentPathToDSSI
228	mov dl, [si]
229	ret
230
231	;--------------------------------------------------------------------
232	; .FindMatchingFilesAndPrintThemToOffScreenBuffer
233	; Parameters:
234	; CX: Initial directory count
235	; DL: Zero if root directory selected
236	; DS:SI: Ptr to DTA with first matching file
237	; Returns:
238	; CX: Incremented by number of files/directories found
239	; Corrupts registers:
240	; AX, BX, DX, DI, DS
241	;--------------------------------------------------------------------
242	ALIGN JUMP_ALIGN
243	.FindMatchingFilesAndPrintThemToOffScreenBuffer:
244	call AppendFileFromDTAinDSSItoOffScreenBuffer
245	call Directory_UpdateDTAForNextMatchUsingPreviousParameters
246	jnc SHORT .FindMatchingFilesAndPrintThemToOffScreenBuffer
247	ret
248
249
250	;--------------------------------------------------------------------
251	; AppendFileFromDTAinDSSItoOffScreenBuffer
252	; Parameters:
253	; CX: Files/directories found
254	; DL: Zero if root directory selected
255	; DS:SI: Ptr to DTA containing file information
256	; Returns:
257	; CX: Incremented by number of files/directories found
258	; Corrupts registers:
259	; AX, BX
260	;--------------------------------------------------------------------
261	ALIGN JUMP_ALIGN
262	AppendFileFromDTAinDSSItoOffScreenBuffer:
263	cmp WORD [si+DTA.szFile], CURRENTDIR_CHARACTERS
264	je SHORT .Return ; We never want "."
265	test dl, dl
266	jnz SHORT .NotInRootDirectory
267	cmp WORD [si+DTA.szFile], UPDIR_CHARACTERS
268	je SHORT .Return ; No ".." when in root directory
269	.NotInRootDirectory:
270	inc cx ; Nothing filtered so increment files/directories
271
272	push bp
273	push si
274	push dx
275	push cx
276	call .FormatFileOrDirectoryToBufferFromDTAinDSSI
277	pop cx
278	pop dx
279	pop si
280	pop bp
281	.Return:
282	ret
283
284	;--------------------------------------------------------------------
285	; .FormatFileOrDirectoryToBufferFromDTAinDSSI
286	; Parameters:
287	; DS:SI: Ptr to DTA containing file information
288	; Returns:
289	; Nothing
290	; Corrupts registers:
291	; AX, BX, CX, DX, SI, DI, BP
292	;--------------------------------------------------------------------
293	ALIGN JUMP_ALIGN
294	.FormatFileOrDirectoryToBufferFromDTAinDSSI:
295	mov bp, sp
296	lea ax, [si+DTA.szFile]
297
298	test BYTE [si+DTA.bFileAttributes], FLG_FILEATTR_DIRECTORY
299	jnz SHORT .FormatDirectory
300	; Fall to .FormatFile
301
302	;--------------------------------------------------------------------
303	; .FormatFile
304	; Parameters:
305	; BP: SP before pushing formatting parameters
306	; DS:AX: Far pointer to file name
307	; DS:SI: Ptr to DTA containing file information
308	; Returns:
309	; Nothing
310	; Corrupts registers:
311	; AX, BX, CX, DX, SI, DI
312	;--------------------------------------------------------------------
313	.FormatFile:
314	xchg si, ax
315	call String_ConvertDSSItoLowerCase
316	xchg ax, si
317
318	; Push parameters for file name
319	push ax ; Push file name offset
320	push ds ; Push file name segment
321
322	; Push parameters for file size
323	mov ax, [si+DTA.dwFileSize]
324	mov dx, [si+DTA.dwFileSize+2]
325	xor bx, bx
326	xor cx, cx
327	call Size_GetSizeToAXAndCharToDLfromBXDXAXwithMagnitudeInCX
328	mov cl, 'i'
329	cmp dl, ' '
330	eCMOVE cl, dl
331	push ax
332	push dx
333	push cx
334
335	; Format to buffer
336	mov si, g_szFileFormat
337	jmp SHORT .FormatStringInCSSIandReturn
338
339	;--------------------------------------------------------------------
340	; .FormatDirectory
341	; Parameters:
342	; BP: SP before pushing formatting parameters
343	; DS:AX: Far pointer to directory name
344	; DS:SI: Ptr to DTA containing file information
345	; Returns:
346	; Nothing
347	; Corrupts registers:
348	; AX, SI, DI
349	;--------------------------------------------------------------------
350	ALIGN JUMP_ALIGN
351	.FormatDirectory:
352	push ax ; Push directory name offset
353	push ds ; Push directory name segment
354	mov ax, g_szSub
355	cmp WORD [si+DTA.szFile], UPDIR_CHARACTERS
356	eCMOVE ax, g_szUp
357	push ax
358	mov si, g_szDirectoryFormat
359	ALIGN JUMP_ALIGN
360	.FormatStringInCSSIandReturn:
361	JMP_DISPLAY_LIBRARY FormatNullTerminatedStringFromCSSI
362
363
364	;--------------------------------------------------------------------
365	; SortDirectoryContentsStringFromESDIwithCountInCX
366	; Parameters:
367	; CX: Number of files and directories
368	; ES:DI: Buffer containing directory contents string
369	; SS:BP: Ptr to DIALOG
370	; Returns:
371	; ES:DI: Ptr to end of directory contents string
372	; Corrupts registers:
373	; AX, BX, CX, DX, SI, DS
374	;--------------------------------------------------------------------
375	ALIGN JUMP_ALIGN
376	SortDirectoryContentsStringFromESDIwithCountInCX:
377	call Registers_CopyESDItoDSSI
378
379	; Add directory contents string length to DI
380	mov ax, FILE_STRING_LENGTH
381	push ax
382	mul cx
383	add di, ax
384
385	mov dx, cx
386	pop cx
387	mov bx, .FileStringComparator
388	jmp Sort_ItemsFromDSSIwithCountInDXsizeInCXandComparatorInBX
389
390	;--------------------------------------------------------------------
391	; .FileStringComparator
392	; Parameters:
393	; CX: Item size in bytes
394	; DS:SI: Ptr to first item to compare
395	; ES:DI: Ptr to second item to compare
396	; Returns:
397	; FLAGS: Signed comparison between first and second item
398	; Corrupts registers:
399	; Nothing
400	;--------------------------------------------------------------------
401	ALIGN JUMP_ALIGN
402	.FileStringComparator:
403	push di
404	push si
405	push cx
406	push bx
407
408	mov bx, FILE_STRING_LENGTH-2 ; Zero BH
409	cmp WORD [si], UPDIR_CHARACTERS
410	je SHORT .ForceValueFromDSSItoBeLess
411	mov bl, [si+bx]
412	cmp bl, [es:di+FILE_STRING_LENGTH-2] ; 'B' for files, 'R' for directories
413	jne SHORT .ForceValueFromDSSItoBeMoreOrLess
414	repe cmpsb ; Two directories or two files
415
416	ALIGN JUMP_ALIGN
417	.ReturnFromComparison:
418	pop bx
419	pop cx
420	pop si
421	pop di
422	ret
423	ALIGN JUMP_ALIGN
424	.ForceValueFromDSSItoBeMoreOrLess:
425	ja SHORT .ForceValueFromDSSItoBeLess ; Directory in SI, file in DI
426	xchg bl, bh
427	; Fall to ForceValueFromDSSItoBeLess
428	ALIGN JUMP_ALIGN
429	.ForceValueFromDSSItoBeLess:
430	cmp bh, bl
431	jmp SHORT .ReturnFromComparison
432
433
434	;--------------------------------------------------------------------
435	; RemoveLastLFandTerminateESDIwithNull
436	; Parameters:
437	; ES:DI: Ptr to end of buffer to terminate
438	; Returns:
439	; Nothing
440	; Corrupts registers:
441	; AX
442	;--------------------------------------------------------------------
443	ALIGN JUMP_ALIGN
444	RemoveLastLFandTerminateESDIwithNull:
445	dec di
446	xor ax, ax
447	stosb
448	ret
449
450
451	;--------------------------------------------------------------------
452	; GetInfoLinesToCXandDialogFlagsToAX
453	; Parameters:
454	; SS:BP: Ptr to DIALOG
455	; Returns:
456	; AX: Dialog flags
457	; CX: Number of info lines to be displayed
458	; Corrupts registers:
459	; SI, DS
460	;--------------------------------------------------------------------
461	ALIGN JUMP_ALIGN
462	GetInfoLinesToCXandDialogFlagsToAX:
463	ePUSH_T ax, Bit_GetSetCountToCXfromAX
464	xor ah, ah
465	; Fall to GetDialogFlagsToAL
466
467	;--------------------------------------------------------------------
468	; GetDialogFlagsToAL
469	; Parameters:
470	; SS:BP: Ptr to DIALOG
471	; Returns:
472	; AL: Dialog flags
473	; Corrupts registers:
474	; SI, DS
475	;--------------------------------------------------------------------
476	ALIGN JUMP_ALIGN
477	GetDialogFlagsToAL:
478	lds si, [bp+DIALOG.fpDialogIO]
479	mov al, [si+FILE_DIALOG_IO.bDialogFlags]
480	ret
481
482
483	;--------------------------------------------------------------------
484	; ParseSelectionFromItemLineInDSSI
485	; Parameters:
486	; DS:SI: Ptr to char buffer containing file or directory to be selected
487	; SS:BP: Ptr to DIALOG
488	; Returns:
489	; Nothing
490	; Corrupts registers:
491	; All, except BP
492	;--------------------------------------------------------------------
493	ALIGN JUMP_ALIGN
494	ParseSelectionFromItemLineInDSSI:
495	mov ax, [si]
496	cmp ax, UPDIR_CHARACTERS
497	je SHORT .ChangeToUpdir
498	call Char_IsUpperCaseLetterInAL
499	jc SHORT .ParseAndChangeToSubdirInDSSI
500	call Char_IsDecimalDigitInAL
501	jc SHORT .ParseAndChangeToSubdirInDSSI ; Assume subdir and check for errors
502	; Fall to .ParseAndSelectFileFromDSSI
503
504	;--------------------------------------------------------------------
505	; .ParseAndSelectFileFromDSSI
506	; Parameters:
507	; DS:SI: NULL terminated string selected from dialog
508	; SS:BP: Ptr to DIALOG
509	; Returns:
510	; Nothing (exits dialog)
511	; Corrupts registers:
512	; All, except BP
513	;--------------------------------------------------------------------
514	.ParseAndSelectFileFromDSSI:
515	les di, [bp+DIALOG.fpDialogIO]
516	add di, BYTE FILE_DIALOG_IO.szFile
517	mov cx, FILENAME_BUFFER_SIZE-1
518	call Memory_CopyCXbytesFromDSSItoESDI
519	xor ax, ax
520	stosb ; Terminate with NULL
521	jmp SHORT CloseFileDialogAfterSuccessfulSelection
522
523	;--------------------------------------------------------------------
524	; .ChangeToUpdir
525	; Parameters:
526	; SS:BP: Ptr to DIALOG
527	; Returns:
528	; Nothing
529	; Corrupts registers:
530	; All, except BP
531	;--------------------------------------------------------------------
532	ALIGN JUMP_ALIGN
533	.ChangeToUpdir:
534	push cs
535	pop ds
536	mov si, g_szUpdir
537	jmp SHORT .ChangeDirectoryToDSSI
538
539	;--------------------------------------------------------------------
540	; .ParseAndChangeToSubdirInDSSI
541	; Parameters:
542	; DS:SI: NULL terminated string selected from dialog
543	; SS:BP: Ptr to DIALOG
544	; Returns:
545	; Nothing
546	; Corrupts registers:
547	; All, except BP
548	;--------------------------------------------------------------------
549	ALIGN JUMP_ALIGN
550	.ParseAndChangeToSubdirInDSSI:
551	mov BYTE [si+12], NULL ; Terminate with NULL (unnecessary spaces do not matter)
552	.ChangeDirectoryToDSSI:
553	call Directory_ChangeToPathFromDSSI
554	jc SHORT .ParseAndSelectFileFromDSSI ; Must have been a file starting with number
555	; Fall to RefreshFilesToDisplay
556
557	;--------------------------------------------------------------------
558	; RefreshFilesToDisplay
559	; Parameters:
560	; SS:BP: Ptr to DIALOG
561	; Returns:
562	; Nothing
563	; Corrupts registers:
564	; All, except BP
565	;--------------------------------------------------------------------
566	ALIGN JUMP_ALIGN
567	RefreshFilesToDisplay:
568	call ReInitializeMenuinitFromSSBP
569	jmp MenuInit_RefreshMenuWindow
570
571
572	;--------------------------------------------------------------------
573	; HandleFunctionKeyFromAH
574	; Parameters:
575	; AH: Scancode for function key
576	; SS:BP: Ptr to DIALOG
577	; Returns:
578	; Nothing
579	; Corrupts registers:
580	; AX, SI, DI, BP
581	;--------------------------------------------------------------------
582	ALIGN JUMP_ALIGN
583	HandleFunctionKeyFromAH:
584	call GetDialogFlagsToAL
585	cmp ah, KEY_FILEDIALOG_NEW_FILE_OR_DIR
586	je SHORT HandleFunctionKeyForCreatingNewFileOrDirectory
587	cmp ah, KEY_FILEDIALOG_SELECT_DIRECTORY
588	je SHORT HandleFunctionKeyForSelectingDirectoryInsteadOfFile
589	cmp ah, KEY_FILEDIALOG_CHANGE_DRIVE
590	je SHORT HandleFunctionKeyForDriveChange
591	ReturnWithoutHandlingKeystroke:
592	clc ; Event not processed
593	ret
594
595
596	;--------------------------------------------------------------------
597	; HandleFunctionKeyForCreatingNewFileOrDirectory
598	; Parameters:
599	; AL: File dialog flags
600	; SS:BP: Ptr to DIALOG
601	; Returns:
602	; Closes file dialog
603	; Corrupts registers:
604	; All, except BP
605	;--------------------------------------------------------------------
606	ALIGN JUMP_ALIGN
607	HandleFunctionKeyForCreatingNewFileOrDirectory:
608	test al, FLG_FILEDIALOG_NEW
609	jz SHORT ReturnWithoutHandlingKeystroke
610
611	mov cx, STRING_DIALOG_IO_size
612	call Memory_ReserveCXbytesFromStackToDSSI
613
614	;;; InitializeStringDialogIoInDSSIforInputtingFileName
615	call InitializeNullStringsToDialogInputInDSSI
616	mov WORD [si+DIALOG_INPUT.fszTitle], g_szEnterNewFileOrDirectory
617	mov WORD [si+STRING_DIALOG_IO.fnCharFilter], NULL
618	mov WORD [si+STRING_DIALOG_IO.wBufferSize], FILENAME_BUFFER_SIZE
619	les ax, [bp+DIALOG.fpDialogIO]
620	add ax, BYTE FILE_DIALOG_IO.szFile
621	mov [si+STRING_DIALOG_IO.fpReturnBuffer], ax
622	mov [si+STRING_DIALOG_IO.fpReturnBuffer+2], es
623	;;;
624
625	CALL_MENU_LIBRARY GetStringWithIoInDSSI
626	mov al, [si+STRING_DIALOG_IO.bUserCancellation]
627	add sp, BYTE STRING_DIALOG_IO_size
628	test al, al ; User cancellation?
629	jnz SHORT ReturnWithoutHandlingKeystroke
630	jmp CloseFileDialogAfterSuccessfulSelection
631
632
633	;--------------------------------------------------------------------
634	; HandleFunctionKeyForSelectingDirectoryInsteadOfFile
635	; Parameters:
636	; AL: File dialog flags
637	; SS:BP: Ptr to DIALOG
638	; Returns:
639	; Closes file dialog
640	; Corrupts registers:
641	; All, except BP
642	;--------------------------------------------------------------------
643	ALIGN JUMP_ALIGN
644	HandleFunctionKeyForSelectingDirectoryInsteadOfFile:
645	test al, FLG_FILEDIALOG_DIRECTORY
646	jz SHORT ReturnWithoutHandlingKeystroke
647	; Fall to CloseFileDialogAfterSuccessfulSelection
648
649	;--------------------------------------------------------------------
650	; CloseFileDialogAfterSuccessfulSelection
651	; Parameters:
652	; SS:BP: Ptr to DIALOG
653	; Returns:
654	; Nothing (exits dialog)
655	; Corrupts registers:
656	; All, except BP
657	;--------------------------------------------------------------------
658	ALIGN JUMP_ALIGN
659	CloseFileDialogAfterSuccessfulSelection:
660	lds di, [bp+DIALOG.fpDialogIO]
661	mov BYTE [di+FILE_DIALOG_IO.bUserCancellation], FALSE
662	jmp MenuInit_CloseMenuWindow
663
664
665	;--------------------------------------------------------------------
666	; HandleFunctionKeyForDriveChange
667	; Parameters:
668	; AL: File dialog flags
669	; SS:BP: Ptr to DIALOG
670	; Returns:
671	; Nothing
672	; Corrupts registers:
673	; All, except BP
674	;--------------------------------------------------------------------
675	ALIGN JUMP_ALIGN
676	HandleFunctionKeyForDriveChange:
677	test al, FLG_FILEDIALOG_DRIVES
678	jz SHORT ReturnWithoutHandlingKeystroke
679
680	call DisplayLoadingMessageInInformationArea
681	mov cx, DRIVE_DIALOG_IO_size
682	call Memory_ReserveCXbytesFromStackToDSSI
683	call .DisplayDriveSelectionDialogWithIoInDSSI
684	call .ChangeDriveToUserSelectionFromIoInDSSI
685	add sp, BYTE DRIVE_DIALOG_IO_size
686	.UserCancelledDriveChange:
687	ret
688
689	;--------------------------------------------------------------------
690	; .DisplayDriveSelectionDialogWithIoInDSSI
691	; Parameters:
692	; DS:SI: Ptr to uninitialized DRIVE_DIALOG_IO
693	; SS:BP: Ptr to DIALOG
694	; Returns:
695	; DS:SI: Ptr to DRIVE_DIALOG_IO
696	; Corrupts registers:
697	; AX, DI
698	;--------------------------------------------------------------------
699	ALIGN JUMP_ALIGN
700	.DisplayDriveSelectionDialogWithIoInDSSI:
701	call InitializeNullStringsToDialogInputInDSSI
702	mov WORD [si+DIALOG_INPUT.fszTitle], g_szSelectNewDrive
703	JMP_MENU_LIBRARY GetDriveWithIoInDSSI
704
705	;--------------------------------------------------------------------
706	; .ChangeDriveToUserSelectionFromIoInDSSI
707	; Parameters:
708	; DS:SI: Ptr to DRIVE_DIALOG_IO
709	; SS:BP: Ptr to DIALOG
710	; Returns:
711	; Nothing
712	; Corrupts registers:
713	; All, except BP
714	;--------------------------------------------------------------------
715	ALIGN JUMP_ALIGN
716	.ChangeDriveToUserSelectionFromIoInDSSI:
717	cmp BYTE [si+DRIVE_DIALOG_IO.bUserCancellation], FALSE
718	jne SHORT .UserCancelledDriveChange
719
720	; Install our Custom Critical Error Handler to catch "Drive Not Ready" errors. This handler only works on DOS 3.0+ systems
721	; but that should be OK because only DOS 3.1+ will trigger it. Under older DOS versions drives are enumerated using
722	; GET_DOS_DRIVE_PARAMETER_BLOCK_FOR_SPECIFIC_DRIVE which will access the drive so we know it is available at this point.
723	mov dx, DosCritical_CustomHandler
724	call DosCritical_InstallNewHandlerFromCSDX
725
726	; Save the current drive on stack in case the selected drive is not ready and the user decides to cancel the change.
727	call Drive_GetDefaultToAL
728	xchg dx, ax
729
730	.RetryDrive:
731	push dx ; Save the previous current drive to stack
732
733	mov dl, [si+DRIVE_DIALOG_IO.bReturnDriveNumber]
734	call Drive_SetDefaultFromDL
735
736	; Now we must try to force a media access to catch "Drive Not Ready".
737	push ds
738	push ss
739	pop ds
740	ePUSH_T ax, CURRENTDIR_CHARACTERS
741	mov cx, FLG_FILEATTR_DIRECTORY
742	mov dx, sp
743	mov ax, FIND_FIRST_MATCHING_FILE<<8
744	int DOS_INTERRUPT_21h
745	pop ax
746	pop ds
747
748	pop dx ; Restore the previous current drive from stack
749
750	xchg ah, [cs:bLastCriticalError] ; Zero bLastCriticalError and fetch error code to AH
751	cmp ah, ERR_DOS_DRIVE_NOT_READY
752	jne SHORT .DriveIsReady
753
754	mov bx, g_szDlgDriveNotReady
755	call Dialogs_DisplayYesNoResponseDialogWithTitleStringInBX
756	jz SHORT .RetryDrive
757	; The user cancelled the drive change. Restore current drive to what it was previously.
758	call Drive_SetDefaultFromDL
759	jmp DosCritical_RestoreDosHandler
760
761	.DriveIsReady:
762	call DosCritical_RestoreDosHandler
763	jmp RefreshFilesToDisplay
764
765
766	;--------------------------------------------------------------------
767	; DisplayLoadingMessageInInformationArea
768	; Parameters:
769	; SS:BP: Ptr to DIALOG
770	; Returns:
771	; Nothing
772	; Corrupts registers:
773	; AX, BX, CX, DX, SI, DI
774	;--------------------------------------------------------------------
775	ALIGN JUMP_ALIGN
776	DisplayLoadingMessageInInformationArea:
777	call MenuText_ClearInformationArea
778	call MenuText_PrepareToDrawInformationArea
779	mov si, g_szLoadingPleaseWait
780	JMP_DISPLAY_LIBRARY PrintNullTerminatedStringFromCSSI
781
782
783	;--------------------------------------------------------------------
784	; InitializeNullStringsToDialogInputInDSSI
785	; Parameters:
786	; DS:SI: Ptr to DIALOG_INPUT
787	; SS:BP: Ptr to DIALOG
788	; Returns:
789	; Nothing
790	; Corrupts registers:
791	; AX
792	;--------------------------------------------------------------------
793	ALIGN JUMP_ALIGN
794	InitializeNullStringsToDialogInputInDSSI:
795	mov ax, g_szNull
796	mov [si+DIALOG_INPUT.fszTitle], ax
797	mov [si+DIALOG_INPUT.fszTitle+2], cs
798	mov [si+DIALOG_INPUT.fszItems], ax
799	mov [si+DIALOG_INPUT.fszItems+2], cs
800	mov [si+DIALOG_INPUT.fszInfo], ax
801	mov [si+DIALOG_INPUT.fszInfo+2], cs
802	ret

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