Routines
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43447: Print Character
Used by the routines at PrintNewline, PrintFullStop, ShiftTextPointer, PrintHyphen, PrintLetterD, PrintOneDecimalDigit, PrintHundredsTensAndUnits, TestSpace, PrintThisCharacter, LeaveFullStop, PrintTheControlCharacter, PrintTextToken, PrintTextBasedOnFlag, PrintLocationText, PrintFormattedObjectList, ParseInput, ReadCommandLine_CommandLinePrints, LeaveQuoteResult, TestFullStop, MapCursorKeys, IgnoreInputUntilGameHasStarted, DeleteInputCharacter, PrintObjectDescriptionText and ProcessCharacterAttribute.
In word-wrap mode, stores each letter at *BufferPointer in the word buffer at WordBuffer until a space, newline or quote, then prints the buffered word. When the print mode flag at PrintModeFlag is set, uses the alternate printer instead.
Input
A Character code to print
Print_Character 43447 PUSH AF Jump ahead to Print_Character_AlternateMode if the print mode flag at PrintModeFlag is not zero.
43448 LD A,(40999)
43451 AND A
43452 JR NZ,Print_Character_AlternateMode
Handle word-wrap mode - write the character into the word buffer.
43454 POP AF Read the word buffer pointer from *BufferPointer.
43455 PUSH AF
43456 PUSH HL
43457 LD HL,(43445)
43460 CP 32 Jump ahead to Print_Character_ScreenPrintMode if the character is a space.
43462 JR Z,Print_Character_ScreenPrintMode
43464 CP 13 Jump ahead to Print_Character_ScreenPrintMode if the character is a new line.
43466 JR Z,Print_Character_ScreenPrintMode
43468 CP 34 Jump ahead to Print_Character_ScreenPrintMode if the character is a quotation mark.
43470 JR Z,Print_Character_ScreenPrintMode
43472 CP 8 Jump ahead to Print_Character_WriteToBuffer if the character is not a backspace.
43474 JR NZ,Print_Character_WriteToBuffer
The character IS a backspace, so handle this.
43476 DEC HL Step the word buffer pointer back and join Print_Character_UpdateBufferPointer to store it.
43477 JR Print_Character_UpdateBufferPointer
Write the character into the word buffer and move the pointer on.
Write the character to the word buffer.
Print_Character_WriteToBuffer 43479 LD (HL),A Write the character to the word buffer.
43480 INC HL Increment the word buffer pointer by one.
Print_Character_UpdateBufferPointer 43481 LD (43445),HL Write the word buffer pointer back to *BufferPointer.
43484 POP HL Restore the saved pointer and the saved result from the stack.
43485 POP AF
43486 RET Return.
The character ends a word. If the word buffer holds letters, print them.
Flush the word buffer when it is not empty.
Print_Character_ScreenPrintMode 43487 PUSH DE Jump to Print_Character_RestoreCharacter if the word buffer is empty.
43488 LD DE,23563
43491 AND A
43492 SBC HL,DE
43494 JR Z,Print_Character_RestoreCharacter
43496 LD A,(49653) Read the screen width.
43499 CP L Compare *ScreenWidth with L (the buffered word length).
43500 PUSH AF Go to Print_Character_ScrollScreen if the word fits on the line.
43501 JR NC,Print_Character_ScrollScreen
43503 LD A,13 Take a new line.
43505 CALL Print_Character_ProcessCharacter Call Print_Character_ProcessCharacter to print one character and remember the line.
Print the buffered letters from WordBuffer and reset the word buffer pointer.
Print_Character_ScrollScreen 43508 PUSH BC Keep the print column and use the buffered length as the glyph counter.
43509 LD B,L
43510 LD HL,23563 HL=23563 (the start of the word buffer, which overwrites DEFADD onwards).
43513 LD (43445),HL Write HL (the start of the word buffer) to *BufferPointer.
Print_Character_ScrollLoop 43516 LD A,(HL) Read the next character of the buffered word.
43517 CALL Print_Character_ProcessCharacter Call Print_Character_ProcessCharacter to print one character and remember the line.
43520 INC HL Move to the next character.
43521 DJNZ Print_Character_ScrollLoop Count the next character and repeat from Print_Character_ScrollLoop.
43523 POP BC Restore BC from the stack.
43524 POP AF
43525 JR NZ,Print_Character_RestoreCharacter And the saved flags, and go to Print_Character_RestoreCharacter when the zero flag is clear.
Clear the print position flag after the buffered word is printed.
43527 XOR A Reset *PrintPositionFlag.
43528 LD (40997),A
Print_Character_RestoreCharacter 43531 POP DE Restore the character from the stack.
43532 POP HL
43533 POP AF
43534 JR Print_Character_ProcessCharacter And jump to Print_Character_ProcessCharacter to print it.
Print the character on the screen.
Use alternate print method (direct screen printing).
Print_Character_AlternateMode 43536 POP AF Jump to CheckTVFlagAndProcess to check the television flag.
43537 JP CheckTVFlagAndProcess
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