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Michaelangel007
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349
printm.s
Normal file
349
printm.s
Normal file
@ -0,0 +1,349 @@
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; Version 0.3
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; ca65
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.feature c_comments
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.feature labels_without_colons
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.feature leading_dot_in_identifiers
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; 65C02
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.PC02
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; Force APPLE 'text' to have high bit on
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; Will display as NORMAL characters
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.macro APPLE text
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.repeat .strlen(text), I
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.byte .strat(text, I) | $80
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.endrep
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.endmacro
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; Force ASCII 'text' to be control chars: $00..$1F
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; Will display as INVERSE characters
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.macro CTRL text
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.repeat .strlen(text), I
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.byte .strat(text, I) & $1F
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.endrep
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.endmacro
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; Force ASCII 'text' to be control chars: $00..$3F
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; Will display as INVERSE characters
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.macro INV text
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.repeat .strlen(text), I
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.byte .strat(text, I) & $3F
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.endrep
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.endmacro
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.macro db val
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.byte val
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.endmacro
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.macro dw val
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.word val
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.endmacro
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.macro ds bytes
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.res bytes
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.endmacro
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/*
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; "X=## Y=## $=####:## %%%%%%%%~%%%%%%%%"
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APPLE " SAVE:?? 76543210 "
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INV "12345678"
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@ 4-Byte Hex 4 chars
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$ 2-Byte Hex 2 chars
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# 1-Byte Dec 3 chars
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& 4-Byte Ptr 1 char
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* 4-Byte Dec 5 chars
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% 1-Byte Bin 8 chars
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? 1-byte Bin inverse 1, normal 0
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*/
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__MAIN = $4000
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.include "dos33.inc"
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HOME = $FC58
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JSR HOME
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LDX #<DATA ; Low Byte of Address
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LDY #>DATA ; High Byte of Address
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JSR PrintM
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RTS
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TEXT
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; TODO: macro to mark up non-literals as high-byte
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;.byte "X=## Y=## $=####:@@ %%%%%%%%~????????"
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APPLE "X="
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.byte "##"
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APPLE " Y="
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.byte "##"
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APPLE " $="
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.byte "####"
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APPLE ":"
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.byte "@@"
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APPLE " "
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.byte "%%%%%%%%"
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APPLE "~"
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.byte "????????"
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.byte 0
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DATA
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dw $0400 ; aArg[-1] Screen Dst
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dw TEXT ; aArg[ 0] text
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dw 39 ; aArg[ 1]
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dw 191 ; aArg[ 2]
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dw $3FF7 ; aArg[ 3]
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dw $3FF7 ; aArg[ 4]
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SetArg
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rts
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/*
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printf() on the 6502
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- is bloated by using a meta-character '%' instead of the high bit
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- doesn't provide a standard way to print binary
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- doesn't provide a standard way to print a deferenced pointer
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Here is a micro replacement:
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* Literals have the high byte set (APPLE text)
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* Meta characters have the high bit cleared (ASCII)
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$ print 2 byte hex
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# print 3 char dec
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The dummy address $C0DE is to force
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a 16-bit address for the assembler
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*/
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; Self-Modifying variable aliases
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_pScreen = PutChar +1
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_pFormat = GetFormat +1
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_iArg = NxtArgByte+1
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_pArg = IncArg +1
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_nHexNibbles = HexNibbles+1
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; printm( format, args, ... )
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PrintM
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STX _pArg+0
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STY _pArg+1
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STZ _iArg
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JSR NxtArgXY
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STX _pScreen+0 ; lo
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STY _pScreen+1 ; hi
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NextArg
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JSR NxtArgXY
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STX _pFormat+0 ; lo
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STY _pFormat+1 ; hi
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BRA GetFormat ; always
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Print
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JSR PutChar
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NextFormat
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JSR IncFormat
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GetFormat
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LDA $C0DE ; _pFormat NOTE: self-modifying!
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BEQ _Done
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BMI Print ; neg = literal
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LDX #NumMeta-1 ; pos = meta
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FindMeta
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CMP MetaChar,X
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BEQ CallMeta
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DEX
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BPL FindMeta
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BMI NextFormat ; always = invalid meta; ignore
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CallMeta
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TXA
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ASL
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TAX
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JMP (MetaFunc,X)
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_Done
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RTS
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; === Meta Ops ===
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PrintHex4
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/*
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JSR GetWidth
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JSR GetArgAddr
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LDX #0
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JSR ToHexXY
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JSR PrintBuf
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*/
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LDA #5
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BNE _PrintHex2
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PrintHex2
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LDA #3
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_PrintHex2
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STA _nHexNibbles
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/*
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JSR GetWidth
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JSR GetArgAddr
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LDX #0
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JSR ToHexXY
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JSR PrintBuf
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*/
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BRA NextFormat ; always
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PrintPtr2
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/*
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JSR GetWidth
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JSR GetArgAddr
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STX GetByte+1
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STY GetByte+2
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GetByte LDA $C0DE
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JSR ToHexXY
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JSR PrintBuf
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*/
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BRA NextFormat ; always
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PrintDec2
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/*
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JSR GetWidth
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JSR GetArgAddr
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JSR ToDecX
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JSR PrintBuf
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*/
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BRA NextFormat ; always
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PrintBinAsc
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/*
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JSR GetWidth
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JSR GetArgAddr
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JSR ToBinX
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JSR PrintBuf
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*/
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BRA NextFormat ; always
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PrintBinInv
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BRA NextFormat ; always
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; === Utility ===
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_CmpMeta = CmpMeta+1
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GetWidth
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STA _CmpMeta ; save last meta
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LDA _pFormat+0 ; Src.Lo
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LDY _pFormat+1 ; Src.Hi
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STA IncWidth+1 ; Dst.Lo
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STY IncWidth+2 ; Dst.Hi
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LDY #0
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IncWidth
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LDA $C0DE,Y ; NOTE: self-modifying!
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STY _nHexNibbles
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CmpMeta
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CMP #$00 ; _CmpMeta NOTE: self-modifying!
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BNE _Done ; optimization: re-use RTS
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INY
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BRA IncWidth
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PutChar
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STA $400 ; NOTE: self-modifying!
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INC PutChar+1 ; inc lo
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RTS
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; @return &aArg[ iArg ] -> XY
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GetArgAddr
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LDX _pArg+0 ; Low Byte
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LDY _pArg+1 ; High Byte
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RTS
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; @return _Arg[ _Num ]
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NxtArgByte
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LDY #00 ; _iArg NOTE: self-modifying!
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IncArg
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LDA $C0DE,Y ; _pArg NOTE: self-modifying!
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INC _iArg ;
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BNE @_SamePage
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INC _pArg+1 ;
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@_SamePage
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RTS
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; @return X,Y 16-bit arg value
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NxtArgXY
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JSR NxtArgByte
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TAX
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JSR NxtArgByte
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TAY
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RTS
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; printf( format, ... )
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; Adjust pointer to next char in format
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IncFormat
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INC _pFormat+0
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BNE @_SamePage
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INC _pFormat+1
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@_SamePage
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RTS
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ToHexXY
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STX _val+0
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STY _val+1
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LDA _val+0
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LDX #0
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_HexDigit
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AND #$F
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CMP #$A ; n < 10 ?
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BCC @_DecDigit
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ADC #6 ; n += 6 $A -> +6 + (C=1) = $11
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@_DecDigit
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ADC #'0'
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ORA #$80
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JSR PutChar
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; 16-bit SHR nibble
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LSR _val+1
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ROR _val+0
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LSR _val+1
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ROR _val+0
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LSR _val+1
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ROR _val+0
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LSR _val+1
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ROR _val+0
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INX
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HexNibbles
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CPX #5 ; _nHexNibbles NOTE: self-modifying!
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BNE _HexDigit
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RTS
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ToDecX
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RTS
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ToBin
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RTS
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; Hex2/Hex4 temp
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_buf ds 8 ; 8 chars for printing binary
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_val dw 0
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MetaChar
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db '?' ; PrintBinInv
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db '%' ; PrintBinAsc
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db '#' ; PrintDec2
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db '$' ; PrintHex2
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; db 'd' ; PrintDec5
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; db 'x' ; PrintHex4
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_MetaCharEnd
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NumMeta = _MetaCharEnd - MetaChar
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MetaFunc
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dw PrintBinInv
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dw PrintBinAsc
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dw PrintDec2
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dw PrintHex4
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__END
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