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source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayFormat.asm@ 572

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Last change on this file since 572 was 526, checked in by krille_n_@…, 12 years ago

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Update of the copyright notices to include the year 2013.

File size: 12.4 KB

Rev	Line
[41]	1	; Project name : Assembly Library
	2	; Description : Functions for displaying formatted strings.
	3
[376]	4	;
[445]	5	; XTIDE Universal BIOS and Associated Tools
[526]	6	; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
[376]	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.
[445]	12	;
[376]	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
[445]	16	; GNU General Public License for more details.
[376]	17	; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
[445]	18	;
[376]	19
[41]	20	; Section containing code
	21	SECTION .text
	22
	23	;--------------------------------------------------------------------
	24	; DisplayFormat_ParseCharacters
	25	; Parameters:
	26	; DS: BDA segment (zero)
[44]	27	; SS:BP: Pointer to first format parameter (-=2 updates to next parameter)
[41]	28	; CS:SI: Pointer to string to format
	29	; ES:DI: Ptr to cursor location in video RAM
	30	; Returns:
[44]	31	; CS:SI: Ptr to end of format string (ptr to one past NULL)
[41]	32	; DI: Updated offset to video RAM
	33	; Corrupts registers:
[44]	34	; AX, BX, CX, DX, BP
[41]	35	;--------------------------------------------------------------------
[369]	36	ALIGN DISPLAY_JUMP_ALIGN
[41]	37	DisplayFormat_ParseCharacters:
[44]	38	call ReadCharacterAndTestForNull
[101]	39	jz SHORT ReturnFromFormat
[44]	40
	41	ePUSH_T cx, DisplayFormat_ParseCharacters ; Return address
	42	xor cx, cx ; Initial placeholder size
	43	cmp al, '%' ; Format specifier?
[101]	44	jne SHORT DisplayPrint_CharacterFromAL
	45	; Fall to ParseFormatSpecifier
[44]	46
[41]	47	;--------------------------------------------------------------------
[44]	48	; ParseFormatSpecifier
[41]	49	; Parameters:
[44]	50	; CX: Placeholder size
	51	; DS: BDA segment (zero)
	52	; SS:BP: Pointer to first format parameter (-=2 for next parameter)
	53	; CS:SI: Pointer to string to format
	54	; ES:DI: Ptr to cursor location in video RAM
	55	; Returns:
	56	; SI: Updated to first unparsed character
	57	; DI: Updated offset to video RAM
	58	; BP: Updated to next format parameter
	59	; Corrupts registers:
	60	; AX, BX, CX, DX
	61	;--------------------------------------------------------------------
	62	ParseFormatSpecifier:
	63	call ReadCharacterAndTestForNull
	64	call Char_IsDecimalDigitInAL
[101]	65	jc SHORT ParsePlaceholderSizeDigitFromALtoCX
[44]	66	call GetFormatSpecifierParserToAX
	67	call ax ; Parser function
	68	dec bp
	69	dec bp ; SS:BP now points to next parameter
[181]	70	inc cx
	71	loop PrependOrAppendSpaces
[101]	72	ReturnFromFormat:
[44]	73	ret
	74
	75	;--------------------------------------------------------------------
[101]	76	; ParsePlaceholderSizeDigitFromALtoCX
[44]	77	; Parameters:
	78	; AL: Digit character from format string
	79	; CX: Current placeholder size
	80	; DS: BDA segment (zero)
	81	; Returns:
	82	; CX: Current placeholder size
	83	; Jumps back to ParseFormatSpecifier
	84	; Corrupts registers:
	85	; AX
	86	;--------------------------------------------------------------------
[369]	87	ALIGN DISPLAY_JUMP_ALIGN
[101]	88	ParsePlaceholderSizeDigitFromALtoCX:
[44]	89	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], di
	90	sub al, '0' ; Digit '0'...'9' to integer 0...9
	91	mov ah, cl ; Previous number parameter to AH
	92	aad ; AL += (AH * 10)
	93	mov cl, al ; Updated number parameter now in CX
	94	jmp SHORT ParseFormatSpecifier
	95
	96
	97	;--------------------------------------------------------------------
	98	; ReadCharacterAndTestForNull
	99	; Parameters:
[41]	100	; CS:SI: Pointer next character from string
	101	; Returns:
	102	; AL: Character from string
	103	; SI: Incremented to next character
	104	; ZF: Set if NULL, cleared if valid character
	105	; Corrupts registers:
	106	; Nothing
	107	;--------------------------------------------------------------------
[369]	108	ALIGN DISPLAY_JUMP_ALIGN
[44]	109	ReadCharacterAndTestForNull:
[223]	110	cs lodsb ; Load from CS:SI to AL
[41]	111	test al, al ; NULL to end string?
	112	ret
	113
	114
	115	;--------------------------------------------------------------------
[44]	116	; GetFormatSpecifierParserToAX
[41]	117	; Parameters:
[44]	118	; AL: Format specifier character
[41]	119	; Returns:
[44]	120	; AX: Offset to parser function
[41]	121	; Corrupts registers:
[44]	122	; AX, BX
[41]	123	;--------------------------------------------------------------------
[369]	124	ALIGN DISPLAY_JUMP_ALIGN
[44]	125	GetFormatSpecifierParserToAX:
	126	mov bx, .rgcFormatCharToLookupIndex
[369]	127	ALIGN DISPLAY_JUMP_ALIGN
[44]	128	.CheckForNextSpecifierParser:
	129	cmp al, [cs:bx]
	130	je SHORT .ConvertIndexToFunctionOffset
	131	inc bx
	132	cmp bx, .rgcFormatCharToLookupIndexEnd
	133	jb SHORT .CheckForNextSpecifierParser
	134	mov ax, c_FormatCharacter
	135	ret
[369]	136	ALIGN DISPLAY_JUMP_ALIGN
[44]	137	.ConvertIndexToFunctionOffset:
	138	sub bx, .rgcFormatCharToLookupIndex
[445]	139	eSHL_IM bx, 1 ; Shift for WORD lookup
[44]	140	mov ax, [cs:bx+.rgfnFormatSpecifierParser]
	141	ret
[41]	142
[44]	143	.rgcFormatCharToLookupIndex:
[134]	144	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[241]	145	db "aIAduxsSctz-+%"
[134]	146	%else
[241]	147	db "IAuxscz-" ; Required by XTIDE Universal BIOS
[134]	148	%endif
[44]	149	.rgcFormatCharToLookupIndexEnd:
	150	ALIGN WORD_ALIGN
	151	.rgfnFormatSpecifierParser:
[134]	152	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[44]	153	dw a_FormatAttributeForNextCharacter
[134]	154	%endif
[184]	155	dw I_FormatDashForZero
[44]	156	dw A_FormatAttributeForRemainingString
[134]	157	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[44]	158	dw d_FormatSignedDecimalWord
[134]	159	%endif
[44]	160	dw u_FormatUnsignedDecimalWord
	161	dw x_FormatHexadecimalWord
	162	dw s_FormatStringFromSegmentCS
[134]	163	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[44]	164	dw S_FormatStringFromFarPointer
[134]	165	%endif
[44]	166	dw c_FormatCharacter
[134]	167	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[44]	168	dw t_FormatRepeatCharacter
[134]	169	%endif
[241]	170	dw z_FormatStringFromSegmentZero
[44]	171	dw PrepareToPrependParameterWithSpaces
[134]	172	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[44]	173	dw PrepareToAppendSpacesAfterParameter
	174	dw percent_FormatPercent
[134]	175	%endif
[41]	176
[44]	177
[41]	178	;--------------------------------------------------------------------
[44]	179	; PrependOrAppendSpaces
[41]	180	; Parameters:
[44]	181	; CX: Minimum length for format specifier in characters
[41]	182	; DS: BDA segment (zero)
	183	; ES:DI: Ptr to cursor location in video RAM
	184	; Returns:
[44]	185	; Nothing
[41]	186	; Corrupts registers:
	187	; AX, BX, CX, DX
	188	;--------------------------------------------------------------------
[369]	189	ALIGN DISPLAY_JUMP_ALIGN
[44]	190	PrependOrAppendSpaces:
	191	mov ax, di
	192	sub ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition]
	193	test cx, cx
	194	js SHORT .PrependWithSpaces
	195	; Fall to .AppendSpaces
[41]	196
	197	;--------------------------------------------------------------------
[44]	198	; .AppendSpaces
[41]	199	; Parameters:
[44]	200	; AX: Number of format parameter BYTEs printed
	201	; CX: Minimum length for format specifier in characters
[41]	202	; DS: BDA segment (zero)
	203	; ES:DI: Ptr to cursor location in video RAM
	204	; Returns:
[44]	205	; Nothing
[41]	206	; Corrupts registers:
[44]	207	; AX, CX, DX
[41]	208	;--------------------------------------------------------------------
[44]	209	.AppendSpaces:
	210	call DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX
	211	sub cx, ax
	212	jle SHORT .NothingToAppendOrPrepend
[41]	213	mov al, ' '
[44]	214	jmp DisplayPrint_RepeatCharacterFromALwithCountInCX
[41]	215
	216	;--------------------------------------------------------------------
[44]	217	; .PrependWithSpaces
[41]	218	; Parameters:
[44]	219	; AX: Number of format parameter BYTEs printed
	220	; CX: Negative minimum length for format specifier in characters
[41]	221	; DS: BDA segment (zero)
	222	; ES:DI: Ptr to cursor location in video RAM
	223	; Returns:
[44]	224	; Nothing
[41]	225	; Corrupts registers:
[44]	226	; AX, BX, CX, DX
[41]	227	;--------------------------------------------------------------------
[369]	228	ALIGN DISPLAY_JUMP_ALIGN
[44]	229	.PrependWithSpaces:
	230	xchg ax, cx
	231	neg ax
	232	call DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX
	233	sub ax, cx ; AX = BYTEs to prepend, CX = BYTEs to move
	234	jle SHORT .NothingToAppendOrPrepend
[41]	235
[47]	236	std
	237	push si
[41]	238
[47]	239	lea si, [di-1] ; SI = Offset to last byte formatted
	240	add di, ax ; DI = Cursor location after preceeding completed
	241	push di
	242	dec di ; DI = Offset where to move last byte formatted
	243	xchg bx, ax ; BX = BYTEs to prepend
[48]	244	call .ReverseCopyCXbytesFromESSItoESDI
[47]	245	xchg ax, bx
	246	call .ReversePrintAXspacesStartingFromESDI
	247
	248	pop di
	249	pop si
	250	cld ; Restore DF
	251	.NothingToAppendOrPrepend:
	252	ret
	253
	254	;--------------------------------------------------------------------
[48]	255	; .ReverseCopyCXbytesFromESSItoESDI
[47]	256	; Parameters:
[48]	257	; CX: Number of bytes to copy
[47]	258	; DS: BDA segment (zero)
[48]	259	; ES:SI: Ptr to old location
	260	; ES:DI: Ptr to new location
[47]	261	; Returns:
[48]	262	; DI: Updated to before last character copied
[47]	263	; Corrupts registers:
	264	; AX, CX, DX, SI
	265	;--------------------------------------------------------------------
[369]	266	ALIGN DISPLAY_JUMP_ALIGN
[48]	267	.ReverseCopyCXbytesFromESSItoESDI:
	268	test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
	269	jz SHORT .CopyWithoutDisplayProcessing
[47]	270
[48]	271	WAIT_RETRACE_IF_NECESSARY_THEN rep movsb
	272	dec di ; Point to preceeding character instead of attribute
	273	ret
[369]	274	ALIGN DISPLAY_JUMP_ALIGN
[48]	275	.CopyWithoutDisplayProcessing:
[44]	276	eSEG_STR rep, es, movsb
[47]	277	ret
	278
	279	;--------------------------------------------------------------------
	280	; .ReversePrintAXspacesStartingFromESDI
	281	; Parameters:
	282	; AX: Number of spaces to print
	283	; DS: BDA segment (zero)
	284	; ES:DI: Ptr to destination in video RAM
	285	; Returns:
	286	; DI: Updated
	287	; Corrupts registers:
	288	; AX, CX, DX
[369]	289	ALIGN DISPLAY_JUMP_ALIGN
[47]	290	.ReversePrintAXspacesStartingFromESDI:
[44]	291	call DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX
	292	xchg cx, ax ; CX = Spaces to prepend
	293	mov al, ' '
[47]	294	jmp DisplayPrint_RepeatCharacterFromALwithCountInCX
[44]	295
	296
	297
	298	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	299	; Formatting functions
[41]	300	; Parameters:
	301	; DS: BDA segment (zero)
[44]	302	; SS:BP: Pointer to next format parameter (-=2 updates to next parameter)
[41]	303	; ES:DI: Ptr to cursor location in video RAM
	304	; Returns:
[44]	305	; SS:BP: Points to last WORD parameter used
[41]	306	; Corrupts registers:
	307	; AX, BX, DX
[44]	308	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
[134]	309	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	310	ALIGN DISPLAY_JUMP_ALIGN
[44]	311	a_FormatAttributeForNextCharacter:
[41]	312	mov bl, [bp]
	313	xchg bl, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute]
[44]	314	push bx
	315	push cx
	316	push di
	317	call DisplayFormat_ParseCharacters ; Recursive call
	318	pop WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition]
	319	pop cx
	320	pop bx
[41]	321	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], bl
[44]	322	ret
[134]	323	%endif
[41]	324
[369]	325	ALIGN DISPLAY_JUMP_ALIGN
[44]	326	A_FormatAttributeForRemainingString:
[41]	327	mov al, [bp]
	328	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al
[44]	329	ret
[41]	330
[134]	331	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	332	ALIGN DISPLAY_JUMP_ALIGN
[44]	333	d_FormatSignedDecimalWord:
[41]	334	mov ax, [bp]
[44]	335	mov bx, 10
	336	jmp DisplayPrint_SignedWordFromAXWithBaseInBX
[134]	337	%endif
[41]	338
[369]	339	ALIGN DISPLAY_JUMP_ALIGN
[44]	340	u_FormatUnsignedDecimalWord:
[41]	341	mov ax, [bp]
	342	mov bx, 10
[44]	343	jmp DisplayPrint_WordFromAXWithBaseInBX
[41]	344
[369]	345	ALIGN DISPLAY_JUMP_ALIGN
[44]	346	x_FormatHexadecimalWord:
[41]	347	mov ax, [bp]
	348	mov bx, 16
	349	call DisplayPrint_WordFromAXWithBaseInBX
	350	mov al, 'h'
[44]	351	jmp DisplayPrint_CharacterFromAL
[41]	352
[369]	353	ALIGN DISPLAY_JUMP_ALIGN
[184]	354	I_FormatDashForZero:
	355	mov ax, [bp]
	356	test ax,ax
[223]	357	jnz u_FormatUnsignedDecimalWord
[184]	358	mov [bp], word g_szDashForZero
	359	;;; fall-through
[223]	360
[369]	361	ALIGN DISPLAY_JUMP_ALIGN
[44]	362	s_FormatStringFromSegmentCS:
[241]	363	push si
	364	push cx
	365	mov si, [bp]
[341]	366
[241]	367	cmp si, byte 07fh ; well within the boundaries of ROMVARS_size
	368	jb .notFormatted
	369
	370	dec bp
	371	dec bp
	372	call DisplayFormat_ParseCharacters
	373	inc bp ; will be decremented after the call is done
	374	inc bp
	375	jmp .done
[341]	376
	377	.notFormatted:
[241]	378	call DisplayPrint_NullTerminatedStringFromCSSI
[341]	379
[241]	380	.done:
	381	pop cx
	382	pop si
[341]	383	ret
[241]	384
[369]	385	ALIGN DISPLAY_JUMP_ALIGN
[341]	386	z_FormatStringFromSegmentZero:
[41]	387	xchg si, [bp]
[241]	388	xor bx, bx
	389	call DisplayPrint_NullTerminatedStringFromBXSI
[44]	390	mov si, [bp]
[341]	391	ret
[41]	392
[134]	393	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	394	ALIGN DISPLAY_JUMP_ALIGN
[44]	395	S_FormatStringFromFarPointer:
	396	mov bx, [bp-2]
[41]	397	xchg si, [bp]
	398	call DisplayPrint_NullTerminatedStringFromBXSI
[44]	399	mov si, [bp]
	400	dec bp
	401	dec bp
	402	ret
[134]	403	%endif
[41]	404
[369]	405	ALIGN DISPLAY_JUMP_ALIGN
[44]	406	c_FormatCharacter:
[41]	407	mov al, [bp]
[44]	408	jmp DisplayPrint_CharacterFromAL
[41]	409
[134]	410	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	411	ALIGN DISPLAY_JUMP_ALIGN
[44]	412	t_FormatRepeatCharacter:
	413	push cx
[41]	414	mov cx, [bp-2]
	415	mov al, [bp]
	416	call DisplayPrint_RepeatCharacterFromALwithCountInCX
[44]	417	pop cx
	418	dec bp
	419	dec bp
	420	ret
[41]	421
[369]	422	ALIGN DISPLAY_JUMP_ALIGN
[44]	423	percent_FormatPercent:
[41]	424	mov al, '%'
[44]	425	jmp DisplayPrint_CharacterFromAL
[134]	426	%endif
[41]	427
[369]	428	ALIGN DISPLAY_JUMP_ALIGN
[44]	429	PrepareToPrependParameterWithSpaces:
	430	neg cx
	431	; Fall to PrepareToAppendSpacesAfterParameter
[41]	432
[369]	433	ALIGN DISPLAY_JUMP_ALIGN
[44]	434	PrepareToAppendSpacesAfterParameter:
	435	add sp, BYTE 2 ; Remove return offset
	436	jmp ParseFormatSpecifier

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