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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