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103 lines
3.5 KiB
Plaintext
103 lines
3.5 KiB
Plaintext
; C02 library stdiox.h02 assembly language subroutines
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;Print Byte as Left Justified Decimal Number
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;void putdel(b)
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;Args: A = number to print
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;Sets: TEMP0 - ones digit
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; TEMP1 - tens digit
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; TEMP2 - hundreds digit
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; TEMP3 - number that was printed
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;putdem - Alternate Entry Point if number is already in TEMP3
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;putdeh - Alternate Entry Point to print only padding spaces
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PUTDEL: STA TEMP3
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PUTDEM: JSR PUTDEC ;Print Decimal Representation of number
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LDA TEMP3 ;
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PUTDEH: CMP #100 ;If Number < 100
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BCS PUTDET ;
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JSR PUTSPC ; Print a Space
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LDA TEMP3 ;
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PUTDET: CMP #10 ; If Number < 10
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BCS PUTDEX ;
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JSR PUTSPC ; Print another Space
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PUTDEX: RTS
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;Print Byte as Right Justified Decimal Number
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;void putder(b)
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;Args: A = number to print
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;Sets: TEMP0 - ones digit
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; TEMP1 - tens digit
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; TEMP2 - hundreds digit
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; TEMP3 - number that was printed
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PUTDER: STA TEMP3
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PUTDES: JSR PUTDEH
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LDA TEMP3
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;Print Byte as Decimal Number
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;void putdec(b)
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;Args: A = number to print
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;Sets: TEMP0 - ones digit
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; TEMP1 - tens digit
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; TEMP2 - hundreds digit
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PUTDEC: JSR CUBCD ;Convert Accumulator to Unpacked BCD
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LDA TEMP2 ;Get High Byte
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BEQ PUTDE1 ;If Not Zero
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JSR PUTDEP ; Convert Low Nybble
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PUTDE1: LDA TEMP1 ;Get Low Byte
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BNE PUTDE2 ;If Not Zero
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CMP TEMP2 ; and Hundreds
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BEQ PUTDE3 ; not Zero
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PUTDE2: JSR PUTDEP ; Convert It
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PUTDE3: LDA TEMP0 ;Get Low Byte
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PUTDEP: ORA #$30 ;Convert to ASCII digit
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JSR PRCHR ;And Print
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RTS
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;Print a Space
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PUTSPC: LDA #32 ;Load Space Character
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JMP PRCHR ;and Print it
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;Print Byte in Formatted String
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;void printf(b, &s)
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;Args: A = number to format
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; Y,X = address of formatting string
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;Sets: TEMP3 - number to format
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PRINTF: JSR SETSRC ;Initialize Source String
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STA TEMP3 ;Save Byte to Format
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PRINTL: LDA (SRCLO),Y ;Read next character in string
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BEQ PRINTX ;If Not 0
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CMP #'% ; If Format Specified
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BEQ PRINTS ; Jump to Formatter
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PRINTC: JSR PRCHR ; Print character at offset,
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PRINTY: INY ; increment offset, and
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BPL PRINTL ; loop if less than 128
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PRINTX: RTS ; characters printed
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;Process Format Specifier
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PRINTS: INY ;Increment Offset
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LDA (SRCLO),Y ;Get Formatting Character
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BEQ PRINTX ;If NUL, then Exit
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CMP #'% ;If Percent Sign
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BEQ PRINTC ; Print it and Continue
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AND #$DF ;Convert to Upper Case
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CMP #'L ;If "l" or "L"
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BNE PRINTR
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LDA TEMP3 ; Load Byte to Format
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JSR PUTDEM ; Print Left Justified
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JMP PRINTY ; and Continue Printing Screen
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PRINTR: CMP #'R ;If "r" or "R"
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BNE PRINTD
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LDA TEMP3 ; Load Byte to Format
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JSR PUTDES ; Print Right Justified
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JMP PRINTY ; and Continue Printing Screen
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PRINTD: CMP #'D ;If "d" or "D"
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BNE PRINTH
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LDA TEMP3 ; Load Byte to Format
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JSR PUTDEC ; Print as Decimal
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JMP PRINTY ; and Continue Printing Screen
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PRINTH: CMP #'H ;Else If "h" or "H"
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BNE PRINTB
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LDA TEMP3 ; Load Byte to Format
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JSR PRBYTE ; Print as Hexadecimal
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JMP PRINTY ; and Continue Printing Screen
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PRINTB: LDA TEMP3 ;Otherwise
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JMP PRINTC ; Print Raw Byte and Continue
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