source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayPrint.asm @ 241

; Project name  :   Assembly Library
; Description   :   Functions for display output.

; Section containing code
SECTION .text


;--------------------------------------------------------------------
; Supports following formatting types:
;   %a      Specifies attribute for next character
;   %A      Specifies attribute for remaining string (or until next %A)
;   %d      Prints signed 16-bit decimal integer
;   %u      Prints unsigned 16-bit decimal integer
;   %x      Prints 16-bit hexadecimal integer
;   %s      Prints string (from CS segment)
;   %S      Prints string (far pointer)
;   %c      Prints character
;   %t      Prints character number of times (character needs to be pushed first, then repeat times)
;   %%      Prints '%' character (no parameter pushed)
;
;   Any placeholder can be set to minimum length by specifying
;   minimum number of characters. For example %8d would append spaces
;   after integer so that at least 8 characters would be printed.
;
;   When placing '-' after number, then spaces will be used for prepending.
;   For example %8-d would prepend integer with spaces so that at least
;   8 characters would be printed.
;
; DisplayPrint_FormattedNullTerminatedStringFromCSSI
;   Parameters:
;       BP:     SP before pushing parameters
;       DS:     BDA segment (zero)
;       CS:SI:  Pointer to string to format
;       ES:DI:  Ptr to cursor location in video RAM
;       Stack:  Parameters for formatting placeholders.
;               Parameter for first placeholder must be pushed first.
;               Low word must pushed first for placeholders requiring
;               32-bit parameters (two words).
;   Returns:
;       DI:     Updated offset to video RAM
;   Corrupts registers:
;       AX, DX
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
DisplayPrint_FormattedNullTerminatedStringFromCSSI:
    push    bp
    push    si
    push    cx
    push    bx
    push    WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute]

    dec     bp                  ; Point BP to...
    dec     bp                  ; ...first stack parameter
    call    DisplayFormat_ParseCharacters

    ; Pop original character attribute
    pop     ax
    mov     [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al

    pop     bx
    pop     cx
    pop     si
    pop     bp

    ret


;--------------------------------------------------------------------
; DisplayPrint_SignedWordFromAXWithBaseInBX
;   Parameters:
;       AX:     Word to display
;       BX:     Integer base (binary=2, octal=8, decimal=10, hexadecimal=16)
;       DS:     BDA segment (zero)
;       ES:DI:  Ptr to cursor location in video RAM
;   Returns:
;       DI:     Updated offset to video RAM
;   Corrupts registers:
;       AX, DX
;--------------------------------------------------------------------
%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
ALIGN JUMP_ALIGN
DisplayPrint_SignedWordFromAXWithBaseInBX:
    test    ax, ax
    jns     SHORT DisplayPrint_WordFromAXWithBaseInBX

    push    ax
    mov     al, '-'
    call    DisplayPrint_CharacterFromAL
    pop     ax
    neg     ax
    ; Fall to DisplayPrint_WordFromAXWithBaseInBX
%endif

;--------------------------------------------------------------------
; DisplayPrint_WordFromAXWithBaseInBX
;   Parameters:
;       AX:     Word to display
;       BX:     Integer base (binary=2, octal=8, decimal=10, hexadecimal=16)
;       DS:     BDA segment (zero)
;       ES:DI:  Ptr to cursor location in video RAM
;   Returns:
;       DI:     Updated offset to video RAM
;   Corrupts registers:
;       AX, DX
;--------------------------------------------------------------------

%ifndef MODULE_STRINGS_COMPRESSED

ALIGN JUMP_ALIGN
DisplayPrint_WordFromAXWithBaseInBX:
    push    cx
    push    bx

    xor     cx, cx
ALIGN JUMP_ALIGN
.DivideLoop:
    xor     dx, dx              ; DX:AX now holds the integer
    div     bx                  ; Divide DX:AX by base
    push    dx                  ; Push remainder
    inc     cx                  ; Increment character count
    test    ax, ax              ; All divided?
    jnz     SHORT .DivideLoop   ;  If not, loop

    mov     bx, .rgcDigitToCharacter
ALIGN JUMP_ALIGN
.PrintNextDigit:
    pop     ax                  ; Pop digit
    cs xlatb
    call    DisplayPrint_CharacterFromAL
    loop    .PrintNextDigit

    pop     bx
    pop     cx
    ret
.rgcDigitToCharacter:   db  "0123456789ABCDEF"

%endif  ; MODULE_STRINGS_COMPRESSED


;--------------------------------------------------------------------
; DisplayPrint_CharacterBufferFromBXSIwithLengthInCX
;   Parameters:
;       CX:     Buffer length (characters)
;       BX:SI:  Ptr to NULL terminated string
;       DS:     BDA segment (zero)
;       ES:DI:  Ptr to cursor location in video RAM
;   Returns:
;       DI:     Updated offset to video RAM
;   Corrupts registers:
;       AX, DX
;--------------------------------------------------------------------
%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
ALIGN JUMP_ALIGN
DisplayPrint_CharacterBufferFromBXSIwithLengthInCX:
    jcxz    .NothingToPrintSinceZeroLength
    push    si
    push    cx

ALIGN JUMP_ALIGN
.PrintNextCharacter:
    mov     ds, bx
    lodsb
    LOAD_BDA_SEGMENT_TO ds, dx
    call    DisplayPrint_CharacterFromAL
    loop    .PrintNextCharacter

    pop     cx
    pop     si
.NothingToPrintSinceZeroLength:
    ret
%endif


;--------------------------------------------------------------------
; DisplayPrint_ClearScreenWithCharInALandAttributeInAH
;   Parameters:
;       AL:     Character to clear with
;       AH:     Attribute to clear with
;       DS:     BDA segment (zero)
;       ES:DI:  Ptr to cursor location in video RAM
;   Returns:
;       Nothing
;   Corrupts registers:
;       AX, DX
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
DisplayPrint_ClearScreenWithCharInALandAttributeInAH:
    push    di
    push    cx

    xchg    cx, ax
    xor     ax, ax
    call    DisplayCursor_SetCoordinatesFromAX      ; Updates DI
    call    DisplayPage_GetColumnsToALandRowsToAH
    mul     ah      ; AX = AL*AH = Characters on screen
    xchg    cx, ax  ; AX = Char+Attr, CX = WORDs to store
    rep stosw

    pop     cx
    pop     di
    mov     [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], di
    ret


;--------------------------------------------------------------------
; DisplayPrint_ClearAreaWithHeightInAHandWidthInAL
;   Parameters:
;       AH:     Area height
;       AL:     Area width
;       DS:     BDA segment (zero)
;       ES:DI:  Ptr to cursor location in video RAM
;   Returns:
;       DI:     Updated offset to video RAM
;   Corrupts registers:
;       AX, DX
;--------------------------------------------------------------------
%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
ALIGN JUMP_ALIGN
DisplayPrint_ClearAreaWithHeightInAHandWidthInAL:
    push    si
    push    cx
    push    bx

    xchg    bx, ax                          ; Area size to BX
    call    DisplayCursor_GetSoftwareCoordinatesToAX
    xchg    si, ax                          ; Software (Y,X) coordinates now in SI
    xor     cx, cx

ALIGN JUMP_ALIGN
.ClearRowLoop:
    mov     cl, bl                          ; Area width now in CX
    mov     al, SCREEN_BACKGROUND_CHARACTER
    call    DisplayPrint_RepeatCharacterFromALwithCountInCX

    xchg    ax, si                          ; Coordinates to AX
    inc     ah                              ; Increment row
    mov     si, ax
    call    DisplayCursor_SetCoordinatesFromAX
    dec     bh                              ; Decrement rows left
    jnz     SHORT .ClearRowLoop

    pop     bx
    pop     cx
    pop     si
    ret
%endif


;--------------------------------------------------------------------
; DisplayPrint_RepeatCharacterFromALwithCountInCX
;   Parameters:
;       AL:     Character to display
;       CX:     Repeat count
;       DS:     BDA segment (zero)
;       ES:DI:  Ptr to cursor location in video RAM
;   Returns:
;       DI:     Updated offset to video RAM
;   Corrupts registers:
;       DX
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
DisplayPrint_RepeatCharacterFromALwithCountInCX:
    jcxz    .NothingToRepeat
    push    cx

ALIGN JUMP_ALIGN
.RepeatCharacter:
    push    ax
    call    DisplayPrint_CharacterFromAL
    pop     ax
    loop    .RepeatCharacter

    pop     cx
.NothingToRepeat:
    ret


;--------------------------------------------------------------------
; DisplayPrint_NullTerminatedStringFromCSSI
;   Parameters:
;       CS:SI:  Ptr to NULL terminated string
;       DS:     BDA segment (zero)
;       ES:DI:  Ptr to cursor location in video RAM
;   Returns:
;       DI:     Updated offset to video RAM
;   Corrupts registers:
;       AX, DX
;--------------------------------------------------------------------
%ifndef MODULE_STRINGS_COMPRESSED
;;;
;;; Take care when using this routine with compressed strings (which is why it is disabled).
;;; All strings in CSSI should go through the DisplayFormatCompressed code to be decoded.
;;;
ALIGN JUMP_ALIGN
DisplayPrint_NullTerminatedStringFromCSSI:
    push    bx
    mov     bx, cs
    call    DisplayPrint_NullTerminatedStringFromBXSI
    pop     bx
    ret
%endif


;;;
;;; Note that the following routines need to be at the bottom of this file
;;; to accomodate short jumps from the next file (DisplayFormat/DisplayFormatCompressed)
;;;

;--------------------------------------------------------------------
; DisplayPrint_Newline
;   Parameters:
;       DS:     BDA segment (zero)
;       ES:DI:  Ptr to cursor location in video RAM
;   Returns:
;       DI:     Updated offset to video RAM
;   Corrupts registers:
;       AX, DX
;--------------------------------------------------------------------
%ifdef MODULE_STRINGS_COMPRESSED
ALIGN JUMP_ALIGN
DisplayPrint_Newline_FormatAdjustBP:
    inc     bp                  ; we didn't need a parameter after all, readjust BP
    inc     bp
    ; fall through to DisplayPrint_Newline
%endif

ALIGN JUMP_ALIGN
DisplayPrint_Newline:
    mov     al, LF
    call    DisplayPrint_CharacterFromAL
    mov     al, CR
    ; Fall to DisplayPrint_CharacterFromAL

;--------------------------------------------------------------------
; DisplayPrint_CharacterFromAL
;   Parameters:
;       AL:     Character to display
;               Zero value is ignored (no characer is printed)
;       DS:     BDA segment (zero)
;       ES:DI:  Ptr to cursor location in video RAM
;   Returns:
;       DI:     Updated offset to video RAM
;   Corrupts registers:
;       AX, DX
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
DisplayPrint_CharacterFromAL:
    test    al,al
    jz      DisplayPrint_Ret

    mov     ah, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute]
    jmp     [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut]


;--------------------------------------------------------------------
; DisplayPrint_NullTerminatedStringFromBXSI
;   Parameters:
;       DS:     BDA segment (zero)
;       BX:SI:  Ptr to NULL terminated string
;       ES:DI:  Ptr to cursor location in video RAM
;   Returns:
;       DI:     Updated offset to video RAM
;   Corrupts registers:
;       AX, DX
;--------------------------------------------------------------------
ALIGN JUMP_ALIGN
DisplayPrint_NullTerminatedStringFromBXSI:
    push    si
    push    cx

    xor     cx, cx
ALIGN JUMP_ALIGN
.PrintNextCharacter:
    mov     ds, bx              ; String segment to DS
    lodsb
    mov     ds, cx              ; BDA segment to DS
    test    al, al              ; NULL?
    jz      SHORT .EndOfString
    call    DisplayPrint_CharacterFromAL
    jmp     SHORT .PrintNextCharacter

ALIGN JUMP_ALIGN
.EndOfString:
    pop     cx
    pop     si

DisplayPrint_Ret:               ; random ret to jump to
    ret