| 1 | ; Project name : Assembly Library
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| 2 | ; Description : Character out function for printing withing menu window.
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| 3 |
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| 4 | ; Section containing code
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| 5 | SECTION .text
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| 6 |
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| 7 | ;--------------------------------------------------------------------
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| 8 | ; MenuCharOut_MenuTeletypeOutputWithAutomaticLineChange
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| 9 | ; MenuCharOut_MenuTeletypeOutput
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| 10 | ; Parameters:
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| 11 | ; AL: Character to output
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| 12 | ; AH: Attribute to output
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| 13 | ; DS: BDA segment (zero)
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| 14 | ; ES:DI: Ptr to video memory where to output
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| 15 | ; [DISPLAY_CONTEXT.wCharOutParam]:
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| 16 | ; Low byte = First column offset (after CR)
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| 17 | ; High byte = Last column offset (when using automatic line change)
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| 18 | ; Returns:
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| 19 | ; DI: Incremented for next character
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| 20 | ; Corrupts registers:
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| 21 | ; AX, DX
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| 22 | ;--------------------------------------------------------------------
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| 23 | ALIGN JUMP_ALIGN
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| 24 | MenuCharOut_MenuTeletypeOutputWithAutomaticLineChange:
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| 25 | call CharOutLineSplitter_IsCursorAtTheEndOfTextLine
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| 26 | jnc SHORT MenuCharOut_MenuTeletypeOutput
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| 27 | cmp al, ' '
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| 28 | jb SHORT ReturnSinceNoNeedToStartLineWithControlCharacter
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| 29 | call CharOutLineSplitter_MovePartialWordToNewTextLine
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| 30 | ; Fall to MenuCharOut_MenuTextTeletypeOutputWithAttribute
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| 31 |
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| 32 | ALIGN JUMP_ALIGN
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| 33 | MenuCharOut_MenuTeletypeOutput:
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| 34 | cmp al, CR
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| 35 | je SHORT PrintCRandAdjustOffsetForStartOfLine
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| 36 | jmp DisplayCharOut_TeletypeOutputWithAttribute
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| 37 |
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| 38 |
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| 39 | ;--------------------------------------------------------------------
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| 40 | ; MenuCharOut_PrintLFCRandAdjustOffsetForStartOfLine
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| 41 | ; PrintCRandAdjustOffsetForStartOfLine
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| 42 | ; Parameters:
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| 43 | ; DS: BDA segment (zero)
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| 44 | ; ES:DI: Ptr to cursor location
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| 45 | ; [DISPLAY_CONTEXT.wCharOutParam]:
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| 46 | ; Low byte = First column offset (after CR)
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| 47 | ; High byte = Last column offset (when using automatic line change)
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| 48 | ; Returns:
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| 49 | ; ES:DI: Ptr to beginning of new line
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| 50 | ; Corrupts registers:
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| 51 | ; AX, DX
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| 52 | ;--------------------------------------------------------------------
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| 53 | ALIGN JUMP_ALIGN
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| 54 | MenuCharOut_PrintLFCRandAdjustOffsetForStartOfLine:
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| 55 | mov al, LF
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| 56 | call DisplayCharOut_BiosTeletypeOutput
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| 57 | ; Fall to PrintCRandAdjustOffsetForStartOfLine
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| 58 |
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| 59 | ALIGN JUMP_ALIGN
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| 60 | PrintCRandAdjustOffsetForStartOfLine:
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| 61 | mov al, CR
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| 62 | call DisplayCharOut_BiosTeletypeOutput
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| 63 | eMOVZX ax, BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam]
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| 64 | add di, ax
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| 65 | ReturnSinceNoNeedToStartLineWithControlCharacter:
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| 66 | ret
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