mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-11-29 16:51:10 +00:00
120 lines
4.2 KiB
Plaintext
120 lines
4.2 KiB
Plaintext
; C02 library stdiox.h02 assembly language subroutines
|
|
|
|
;Print Byte as Left Justified Decimal Number
|
|
;void putdel(b)
|
|
;Args: A = number to print
|
|
;Sets: TEMP0 - ones digit
|
|
; TEMP1 - tens digit
|
|
; TEMP2 - hundreds digit
|
|
; TEMP3 - number that was printed
|
|
;putdem - Alternate Entry Point if number is already in TEMP3
|
|
;putdeh - Alternate Entry Point to print only padding spaces
|
|
PUTDEL: STA TEMP3
|
|
PUTDEM: JSR PUTDEC ;Print Decimal Representation of number
|
|
LDA TEMP3 ;
|
|
PUTDEH: CMP #100 ;If Number < 100
|
|
BCS PUTDET ;
|
|
JSR PUTSPC ; Print a Space
|
|
LDA TEMP3 ;
|
|
PUTDET: CMP #10 ; If Number < 10
|
|
BCS PUTDEX ;
|
|
JSR PUTSPC ; Print another Space
|
|
PUTDEX: RTS
|
|
|
|
;Print Byte as Right Justified Decimal Number
|
|
;void putder(b)
|
|
;Args: A = number to print
|
|
;Sets: TEMP0 - ones digit
|
|
; TEMP1 - tens digit
|
|
; TEMP2 - hundreds digit
|
|
; TEMP3 - number that was printed
|
|
PUTDER: STA TEMP3
|
|
PUTDES: JSR PUTDEH
|
|
LDA TEMP3
|
|
|
|
;Print Byte as Decimal Number
|
|
;void putdec(b)
|
|
;Args: A = number to print
|
|
;Sets: TEMP0 - ones digit
|
|
; TEMP1 - tens digit
|
|
; TEMP2 - hundreds digit
|
|
PUTDEC: JSR CUBCD ;Convert Accumulator to Unpacked BCD
|
|
LDA TEMP2 ;Get High Byte
|
|
BEQ PUTDE1 ;If Not Zero
|
|
JSR PUTDEP ; Convert Low Nybble
|
|
PUTDE1: LDA TEMP1 ;Get Low Byte
|
|
BNE PUTDE2 ;If Not Zero
|
|
CMP TEMP2 ; and Hundreds
|
|
BEQ PUTDE3 ; not Zero
|
|
PUTDE2: JSR PUTDEP ; Convert It
|
|
PUTDE3: LDA TEMP0 ;Get Low Byte
|
|
PUTDEP: ORA #$30 ;Convert to ASCII digit
|
|
JSR PRCHR ;And Print
|
|
RTS
|
|
|
|
;Print a Space
|
|
PUTSPC: LDA #32 ;Load Space Character
|
|
JMP PRCHR ;and Print it
|
|
|
|
;Print Byte in Formatted String
|
|
;void printf(b, &s)
|
|
;Args: A = number to format
|
|
; Y,X = address of formatting string
|
|
;Sets: TEMP3 - number to format
|
|
PRINTF: JSR SETSRC ;Initialize Source String
|
|
STA TEMP3 ;Save Byte to Format
|
|
PRINTL: LDA (SRCLO),Y ;Read next character in string
|
|
BEQ PRINTX ;If Not 0
|
|
CMP #'% ;' If Format Specified
|
|
BEQ PRINTP ; Jump to Formatter
|
|
PRINTC: JSR PRCHR ; Print character at offset,
|
|
PRINTY: INY ; increment offset, and
|
|
BPL PRINTL ; loop if less than 128
|
|
PRINTX: RTS ; characters printed
|
|
;Process Format Specifier
|
|
PRINTP: INY ;Increment Offset
|
|
LDA (SRCLO),Y ;Get Formatting Character
|
|
BEQ PRINTX ;If NUL, then Exit
|
|
CMP #'% ;'If Percent Sign
|
|
BEQ PRINTC ; Print it and Continue
|
|
AND #$DF ;Convert to Upper Case
|
|
CMP #'L ;'If "l" or "L"
|
|
BNE PRINTR
|
|
LDA TEMP3 ; Load Byte to Format
|
|
JSR PUTDEM ; Print Left Justified
|
|
JMP PRINTY ; and Continue Printing Screen
|
|
PRINTR: CMP #'R ;'If "r" or "R"
|
|
BNE PRINTD
|
|
LDA TEMP3 ; Load Byte to Format
|
|
JSR PUTDES ; Print Right Justified
|
|
JMP PRINTY ; and Continue Printing Screen
|
|
PRINTD: CMP #'D ;'Else If "d" or "D"
|
|
BNE PRINTH
|
|
LDA TEMP3 ; Load Byte to Format
|
|
JSR PUTDEC ; Print as Decimal
|
|
JMP PRINTY ; and Continue Printing Screen
|
|
PRINTH: CMP #'H ;'Else If "h" or "H"
|
|
BNE PRINTS
|
|
LDA TEMP3 ; Load Byte to Format
|
|
JSR PRBYTE ; Print as Hexadecimal
|
|
JMP PRINTY ; and Continue Printing Screen
|
|
PRINTS: CMP #'S ;'Else If "s" or "s"
|
|
BNE PRINTB
|
|
STY TEMP0 ; Save Index
|
|
JSR PUTDST ; Print Destination String
|
|
LDY TEMP0 ; Restore Index
|
|
JMP PRINTY ;
|
|
PRINTB: LDA TEMP3 ;Else
|
|
JMP PRINTC ; Print Raw Byte and Continue
|
|
|
|
;and fall into putsub
|
|
;char putdst()
|
|
PUTDST: LDY #0 ;Initialize character offset
|
|
PUTDSL: LDA (DSTLO),Y ;Read next character in string
|
|
BEQ PUTDSX ;If Not 0
|
|
JSR PUTC ; Print character at offset,
|
|
INY ; increment offset, and
|
|
BPL PUTDSL ; loop if less than 128
|
|
PUTDSX: TYA ;Return number of
|
|
RTS ; characters printed
|