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216bb22b20
The PCEngine needs such operands to be redirected to RAM page $20 explicitly. Fixes #1482; fixes #1483.
792 lines
21 KiB
ArmAsm
792 lines
21 KiB
ArmAsm
;
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; _printf: Basic layer for all printf type functions.
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;
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; 2000-10-21, Ullrich von Bassewitz
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; 2021-05-04, Greg King
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;
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.include "zeropage.inc"
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.export __printf
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.import popax, pushax, pusheax, decsp6, push1, axlong, axulong
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.import _ltoa, _ultoa
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.import _strlower, _strlen
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.macpack generic
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; ----------------------------------------------------------------------------
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; We will store variables into the register bank in the zeropage. Define
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; equates for these variables.
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ArgList = regbank+0 ; Argument list pointer
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Format = regbank+2 ; Format string
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OutData = regbank+4 ; Function parameters
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; ----------------------------------------------------------------------------
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; Other zero page cells
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Base = ptr1
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FSave = ptr1
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FCount = ptr2
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.code
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; ----------------------------------------------------------------------------
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; Get one character from the format string, and increment the pointer. Will
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; return zero in .Y.
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GetFormatChar:
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ldy #0
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lda (Format),y
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IncFormatPtr:
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inc Format
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bne @L1
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inc Format+1
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@L1: rts
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; ----------------------------------------------------------------------------
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; Output a pad character: outfunc (d, &padchar, 1)
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OutputPadChar:
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lda PadChar
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; ----------------------------------------------------------------------------
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; Call the output function with one character in .A
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Output1:
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sta CharArg
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jsr PushOutData
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lda #<CharArg
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ldx #>CharArg
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jsr pushax
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jsr push1
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jmp CallOutFunc ; fout (OutData, &CharArg, 1)
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; ----------------------------------------------------------------------------
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; Decrement the argument list pointer by 2
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DecArgList2:
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lda ArgList
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sub #2
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sta ArgList
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bcs @L1
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dec ArgList+1
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@L1: rts
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; ----------------------------------------------------------------------------
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; Get an unsigned int or long argument depending on the IsLong flag.
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GetUnsignedArg:
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lda IsLong ; Check flag
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bne GetLongArg ; Long sets all
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jsr GetIntArg ; Get an integer argument
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jmp axulong ; Convert to unsigned long
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; ----------------------------------------------------------------------------
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; Get an signed int or long argument depending on the IsLong flag.
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GetSignedArg:
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lda IsLong ; Check flag
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bne GetLongArg ; Long sets all
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jsr GetIntArg ; Get an integer argument
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jmp axlong ; Convert to long
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; ----------------------------------------------------------------------------
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; Get a long argument from the argument list. Returns 0 in .Y.
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GetLongArg:
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jsr GetIntArg ; Get high word
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sta sreg
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stx sreg+1
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; Run into GetIntArg fetching the low word
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; ----------------------------------------------------------------------------
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; Get an integer argument from the argument list. Returns 0 in .Y.
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GetIntArg:
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jsr DecArgList2
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ldy #1
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lda (ArgList),y
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tax
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dey
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lda (ArgList),y
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rts
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; ----------------------------------------------------------------------------
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; Read an integer from the format string. Will return zero in .Y.
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ReadInt:
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ldy #0
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sty ptr1
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sty ptr1+1 ; Start with zero
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@Loop: lda (Format),y ; Get format string character
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sub #'0' ; Make number from ascii digit
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bcc @L9 ; Jump if done
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cmp #9+1
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bcs @L9 ; Jump if done
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; Skip the digit character
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jsr IncFormatPtr
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; Add the digit to the value we have in ptr1
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pha ; Save digit value
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lda ptr1
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ldx ptr1+1
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asl ptr1
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rol ptr1+1 ; * 2
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asl ptr1
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rol ptr1+1 ; * 4, assume carry clear
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adc ptr1
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sta ptr1
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txa
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adc ptr1+1
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sta ptr1+1 ; * 5
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asl ptr1
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rol ptr1+1 ; * 10, assume carry clear
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pla
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adc ptr1 ; Add digit value
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sta ptr1
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bcc @Loop
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inc ptr1+1
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bcs @Loop ; Branch always
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; We're done converting
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@L9: lda ptr1
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ldx ptr1+1 ; Load result
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rts
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; ----------------------------------------------------------------------------
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; Put a character into the argument buffer and increment the buffer index
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PutBuf: ldy BufIdx
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inc BufIdx
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sta Buf,y
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rts
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; ----------------------------------------------------------------------------
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; Get a pointer to the current buffer end and push it onto the stack
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PushBufPtr:
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lda #<Buf
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ldx #>Buf
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add BufIdx
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bcc @L1
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inx
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@L1: jmp pushax
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; ----------------------------------------------------------------------------
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; Push OutData onto the software stack
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PushOutData:
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lda OutData
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ldx OutData+1
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jmp pushax
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; ----------------------------------------------------------------------------
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; Output Width pad characters
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;
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PadLoop:
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jsr OutputPadChar
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OutputPadding:
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inc Width
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bne PadLoop
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inc Width+1
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bne PadLoop
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rts
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; ----------------------------------------------------------------------------
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; Output the argument itself: outfunc (d, str, arglen);
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;
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OutputArg:
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jsr PushOutData
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lda Str
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ldx Str+1
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jsr pushax
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lda ArgLen
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ldx ArgLen+1
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jsr pushax
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jmp CallOutFunc
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; ----------------------------------------------------------------------------
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; ltoa: Wrapper for _ltoa that pushes all arguments
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ltoa: sty Base ; Save base
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jsr pusheax ; Push value
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jsr PushBufPtr ; Push the buffer pointer...
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lda Base ; Restore base
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jmp _ltoa ; ultoa (l, s, base);
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; ----------------------------------------------------------------------------
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; ultoa: Wrapper for _ultoa that pushes all arguments
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ultoa: sty Base ; Save base
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jsr pusheax ; Push value
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jsr PushBufPtr ; Push the buffer pointer...
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lda Base ; Restore base
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jmp _ultoa ; ultoa (l, s, base);
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; ----------------------------------------------------------------------------
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;
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__printf:
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; Save the register bank variables into the save area
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pha ; Save low byte of ap
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ldy #5
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; The PC-Engine puts the zero-page at $2000. The indexed-by-.Y addressing mode
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; doesn't allow zero-page addressing. Therefore, the operand must be redirected
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; explicitly.
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Save: lda regbank+$2000,y
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sta RegSave,y
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dey
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bpl Save
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pla ; Restore low byte of ap
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; Get the parameters from the stack
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sta ArgList ; Argument list pointer
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stx ArgList+1
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jsr popax ; Format string
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sta Format
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stx Format+1
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jsr popax ; Output descriptor
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sta OutData
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stx OutData+1
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; Initialize the output counter in the output descriptor to zero
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lda #0
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tay
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sta (OutData),y
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iny
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sta (OutData),y
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; Get the output function from the output descriptor and remember it
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iny
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lda (OutData),y
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sta CallOutFunc+1
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iny
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lda (OutData),y
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sta CallOutFunc+2
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; Start parsing the format string
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MainLoop:
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lda Format ; Remember current format pointer
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sta FSave
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lda Format+1
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sta FSave+1
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ldy #0 ; Index
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@L1: lda (Format),y ; Get next char
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beq @L2 ; Jump on end of string
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cmp #'%' ; Format spec?
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beq @L2
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iny ; Bump pointer
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bne @L1
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inc Format+1 ; Bump high byte of pointer
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bne @L1 ; Branch always
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; Found a '%' character or end of string. Update the Format pointer so it is
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; current (points to this character).
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@L2: tya ; Low byte of offset
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add Format
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sta Format
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bcc @L3
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inc Format+1
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; Calculate, how many characters must be output. Beware: This number may
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; be zero. .A still contains the low byte of the pointer.
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@L3: sub FSave
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sta FCount
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lda Format+1
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sbc FSave+1
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sta FCount+1
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ora FCount ; Is the result zero?
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beq @L4 ; Jump if yes
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; Output the characters that we have until now. To make the call to out
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; faster, build the stack frame by hand (don't use pushax)
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jsr decsp6 ; 3 args
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ldy #5
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lda OutData+1
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sta (sp),y
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dey
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lda OutData
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sta (sp),y
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dey
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lda FSave+1
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sta (sp),y
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dey
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lda FSave
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sta (sp),y
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dey
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lda FCount+1
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sta (sp),y
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dey
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lda FCount
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sta (sp),y
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jsr CallOutFunc ; Call the output function
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; We're back from out(), or we didn't call it. Check for end of string.
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@L4: jsr GetFormatChar ; Get one char, zero in .Y
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tax ; End of format string reached?
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bne NotDone ; End not reached
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; End of format string reached. Restore the zeropage registers and return.
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ldx #5
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Rest: lda RegSave,x
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; The indexed-by-.X addressing mode does allow zero-page addressing.
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; Therefore, this operand doesn't need to be redirected explicitly.
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sta regbank,x
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dex
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bpl Rest
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rts
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; Still a valid format character. Check for '%' and a '%%' sequence. Output
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; anything that is not a format specifier. On intro, .Y is zero.
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NotDone:
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cmp #'%'
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bne @L1
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lda (Format),y ; Check for "%%"
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cmp #'%'
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bne FormatSpec ; Jump if really a format specifier
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jsr IncFormatPtr ; Skip the second '%'
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@L1: jsr Output1 ; Output the character...
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jmp MainLoop ; ...and continue
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; We have a real format specifier
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; Format is: %[flags][width][.precision][mod]type
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; .Y is zero on entry.
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FormatSpec:
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; Initialize the flags
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lda #0
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ldx #FormatVarSize-1
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@L1: sta FormatVars,x
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dex
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bpl @L1
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; Start with reading the flags if there are any. .X is $FF which is used
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; for "true"
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ReadFlags:
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lda (Format),y ; Get next char...
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cmp #'-'
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bne @L1
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stx LeftJust
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beq @L4
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@L1: cmp #'+'
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bne @L2
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stx AddSign
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beq @L4
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@L2: cmp #' '
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bne @L3
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stx AddBlank
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beq @L4
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@L3: cmp #'#'
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bne ReadPadding
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stx AltForm
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@L4: jsr IncFormatPtr
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jmp ReadFlags ; ...and start over
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; Done with flags, read the pad char. .Y is still zero if we come here.
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ReadPadding:
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ldx #' ' ; PadChar
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cmp #'0'
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bne @L1
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tax ; PadChar is '0'
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jsr IncFormatPtr
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lda (Format),y ; Read current for later
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@L1: stx PadChar
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; Read the width. Even here, .Y is still zero. .A contains the current character
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; from the format string.
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ReadWidth:
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cmp #'*'
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bne @L1
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jsr IncFormatPtr
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jsr GetIntArg ; Width is an additional argument
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jmp @L2
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@L1: jsr ReadInt ; Read integer from format string...
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@L2: sta Width
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stx Width+1 ; ...and remember in Width
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; Read the precision. Even here, .Y is still zero.
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sty Prec ; Assume Precision is zero
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sty Prec+1
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lda (Format),y ; Load next format string char
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cmp #'.' ; Precision given?
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bne ReadMod ; Branch if no precision given
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ReadPrec:
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jsr IncFormatPtr ; Skip the '.'
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lda (Format),y
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cmp #'*' ; Variable precision?
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bne @L1
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jsr IncFormatPtr ; Skip the '*'
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jsr GetIntArg ; Get integer argument
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jmp @L2
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@L1: jsr ReadInt ; Read integer from format string
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@L2: sta Prec
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stx Prec+1
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; Read the modifiers. .Y is still zero.
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ReadMod:
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lda (Format),y
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cmp #'z' ; size_t - same as unsigned
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beq @L2
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cmp #'h' ; short - same as int
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beq @L2
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cmp #'t' ; ptrdiff_t - same as int
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beq @L2
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cmp #'j' ; intmax_t/uintmax_t - same as long
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beq @L1
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cmp #'L' ; long double
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beq @L1
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cmp #'l' ; long int
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bne DoFormat
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@L1: lda #$FF
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sta IsLong
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@L2: jsr IncFormatPtr
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jmp ReadMod
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; Initialize the argument buffer pointers. We use a static buffer (ArgBuf) to
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; assemble strings. A zero page index (BufIdx) is used to keep the current
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; write position. A pointer to the buffer (Str) is used to point to the
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; argument in case we will not use the buffer but a user-supplied string.
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; .Y is zero when we come here.
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DoFormat:
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sty BufIdx ; Clear BufIdx
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ldx #<Buf
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stx Str
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ldx #>Buf
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stx Str+1
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; Skip the current format character, then check it (current char in .A)
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jsr IncFormatPtr
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; Is it a character?
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cmp #'c'
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bne CheckInt
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; It is a character
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jsr GetIntArg ; Get the argument (promoted to int)
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sta Buf ; Place it as zero terminated string...
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lda #0
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sta Buf+1 ; ...into the buffer
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jmp HaveArg ; Done
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; Is it an integer?
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CheckInt:
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cmp #'d'
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beq @L1
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cmp #'i'
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bne CheckCount
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; It is an integer
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@L1: ldx #0
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lda AddBlank ; Add a blank for positives?
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beq @L2 ; Jump if no
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ldx #' '
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@L2: lda AddSign ; Add a plus for positives (precedence)?
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beq @L3
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ldx #'+'
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@L3: stx Leader
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; Integer argument
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jsr GetSignedArg ; Get argument as a long
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ldy sreg+1 ; Check sign
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bmi @Int1
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ldy Leader
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beq @Int1
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sty Buf
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inc BufIdx
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@Int1: ldy #10 ; Base
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jsr ltoa ; Push arguments, call _ltoa
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jmp HaveArg
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; Is it a count pseudo format?
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CheckCount:
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cmp #'n'
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bne CheckOctal
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; It is a count pseudo argument
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jsr GetIntArg
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sta ptr1
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stx ptr1+1 ; Get user supplied pointer
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ldy #0
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lda (OutData),y ; Low byte of OutData->ccount
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sta (ptr1),y
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iny
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lda (OutData),y ; High byte of OutData->ccount
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sta (ptr1),y
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jmp MainLoop ; Done
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; Check for an octal digit
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CheckOctal:
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cmp #'o'
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bne CheckPointer
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; Integer in octal representation
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jsr GetSignedArg ; Get argument as a long
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ldy AltForm ; Alternative form?
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beq @Oct1 ; Jump if no
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pha ; Save low byte of value
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stx tmp1
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ora tmp1
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ora sreg
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ora sreg+1
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ora Prec
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ora Prec+1 ; Check if value or Prec != 0
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beq @Oct1
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lda #'0'
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jsr PutBuf
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pla ; Restore low byte
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@Oct1: ldy #8 ; Load base
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jsr ltoa ; Push arguments, call _ltoa
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jmp HaveArg
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; Check for a pointer specifier (%p)
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CheckPointer:
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cmp #'p'
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bne CheckString
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; It's a pointer. Use %#x conversion
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ldx #0
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stx IsLong ; IsLong = 0;
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inx
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stx AltForm ; AltForm = 1;
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lda #'x'
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bne IsHex ; Branch always
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; Check for a string specifier (%s)
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CheckString:
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cmp #'s'
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bne CheckUnsigned
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; It's a string
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jsr GetIntArg ; Get 16bit argument
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sta Str
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stx Str+1
|
|
jmp HaveArg
|
|
|
|
; Check for an unsigned integer (%u)
|
|
|
|
CheckUnsigned:
|
|
cmp #'u'
|
|
bne CheckHex
|
|
|
|
; It's an unsigned integer
|
|
|
|
jsr GetUnsignedArg ; Get argument as unsigned long
|
|
ldy #10 ; Load base
|
|
jsr ultoa ; Push arguments, call _ultoa
|
|
jmp HaveArg
|
|
|
|
; Check for a hexadecimal integer (%x)
|
|
|
|
CheckHex:
|
|
cmp #'x'
|
|
beq IsHex
|
|
cmp #'X'
|
|
bne UnknownFormat
|
|
|
|
; Hexadecimal integer
|
|
|
|
IsHex: pha ; Save the format spec
|
|
lda AltForm
|
|
beq @L1
|
|
lda #'0'
|
|
jsr PutBuf
|
|
lda #'X'
|
|
jsr PutBuf
|
|
|
|
@L1: jsr GetUnsignedArg ; Get argument as an unsigned long
|
|
ldy #16 ; Load base
|
|
jsr ultoa ; Push arguments, call _ultoa
|
|
|
|
pla ; Get the format spec
|
|
cmp #'x' ; Lower case?
|
|
bne @L2
|
|
lda Str
|
|
ldx Str+1
|
|
jsr _strlower ; Make characters lower case
|
|
@L2: jmp HaveArg
|
|
|
|
; Unknown format character, skip it
|
|
|
|
UnknownFormat:
|
|
jmp MainLoop
|
|
|
|
; We have the argument, do argument string formatting
|
|
|
|
HaveArg:
|
|
|
|
; ArgLen = strlen (Str);
|
|
|
|
lda Str
|
|
ldx Str+1
|
|
jsr _strlen ; Get length of argument
|
|
sta ArgLen
|
|
stx ArgLen+1
|
|
|
|
; if (Prec && Prec < ArgLen) ArgLen = Prec;
|
|
|
|
lda Prec
|
|
ora Prec+1
|
|
beq @L1
|
|
ldx Prec
|
|
cpx ArgLen
|
|
lda Prec+1
|
|
tay
|
|
sbc ArgLen+1
|
|
bcs @L1
|
|
stx ArgLen
|
|
sty ArgLen+1
|
|
|
|
; if (Width > ArgLen) {
|
|
; Width -= ArgLen; /* padcount */
|
|
; } else {
|
|
; Width = 0;
|
|
; }
|
|
; Since width is used as a counter below, calculate -(width+1)
|
|
|
|
@L1: sec
|
|
lda Width
|
|
sbc ArgLen
|
|
tax
|
|
lda Width+1
|
|
sbc ArgLen+1
|
|
bcs @L2
|
|
lda #0
|
|
tax
|
|
@L2: eor #$FF
|
|
sta Width+1
|
|
txa
|
|
eor #$FF
|
|
sta Width
|
|
|
|
; /* Do padding on the left side if needed */
|
|
; if (!leftjust) {
|
|
; /* argument right justified */
|
|
; while (width) {
|
|
; fout (d, &padchar, 1);
|
|
; --width;
|
|
; }
|
|
; }
|
|
|
|
lda LeftJust
|
|
bne @L3
|
|
jsr OutputPadding
|
|
|
|
; Output the argument itself
|
|
|
|
@L3: jsr OutputArg
|
|
|
|
; /* Output right padding bytes if needed */
|
|
; if (leftjust) {
|
|
; /* argument left justified */
|
|
; while (width) {
|
|
; fout (d, &padchar, 1);
|
|
; --width;
|
|
; }
|
|
; }
|
|
|
|
lda LeftJust
|
|
beq @L4
|
|
jsr OutputPadding
|
|
|
|
; Done, parse next chars from format string
|
|
|
|
@L4: jmp MainLoop
|
|
|
|
|
|
; ----------------------------------------------------------------------------
|
|
; Local data (all static)
|
|
|
|
.bss
|
|
|
|
; Save area for the zero page registers
|
|
RegSave: .res regbanksize
|
|
|
|
; One character argument for OutFunc
|
|
CharArg: .byte 0
|
|
|
|
; Format variables
|
|
FormatVars:
|
|
LeftJust: .byte 0
|
|
AddSign: .byte 0
|
|
AddBlank: .byte 0
|
|
AltForm: .byte 0
|
|
PadChar: .byte 0
|
|
Width: .word 0
|
|
Prec: .word 0
|
|
IsLong: .byte 0
|
|
Leader: .byte 0
|
|
BufIdx: .byte 0 ; Argument string pointer
|
|
FormatVarSize = * - FormatVars
|
|
|
|
; Argument buffer and pointer
|
|
Buf: .res 20
|
|
Str: .word 0
|
|
ArgLen: .res 2
|
|
|
|
.data
|
|
|
|
; Stuff from OutData. Is used as a vector
|
|
CallOutFunc: jmp $0000
|