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Ver 12
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Michaelangel007
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printm.s
152
printm.s
@ -1,7 +1,68 @@
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; Version 11
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; Version 12
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; ca65
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.feature c_comments
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/*
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Problem:
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We want to print this:
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.byte "X=## Y=### $=####:@@ %%%%%%%%~????????"
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without having to waste marking up literals with an escape character
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Why printf() on the 6502 sucks:
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- is bloated by using a meta-character '%' instead of the high bit
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- doesn't provide a standard way to print binary *facepalm*
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- doesn't provide a standard way to print a deferenced pointer
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- 2 digit, 3 digit and 5 digit decimals requiring wasting "width" characters
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e.g. %2d, %3d, %5d
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When a single character would work instead.
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Solution:
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Here is a micro replacement, printm()
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* Literals have the high byte set (APPLE text)
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* Meta characters have the high bit cleared (ASCII)
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x Hex - print 2 Byte
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$ Hex - print 4 Byte
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@ Ptr - print hex byte at 16-bit pointer
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& Ptr - print hex word at 16-bit pointer
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# Dec - Print 1 Byte in decimal (max 2 digits)
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d Dec - Print 2 Byte in decimal (max 3 digits)
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u Dec - Print 2 Byte in decimal (max 5 digits)
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b Dec - Print signed byte
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% Bin 1 Byte
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? Bin 1 Byte but 1's are printed in inverse
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a Str - APPLE text (high bit set), last char is ASCII
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s Str - C string, zero terminated
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p Str - Pascal string, first character is string length
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Note: The dummy address $C0DE is to force the assembler
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to generate a 16-bit address instead of optimizing a ZP operand
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To toggle features on / off:
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*/
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ENABLE_BIN = 0
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ENABLE_DEC = 0
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ENABLE_BYTE = 0 ; requires ENABLE_DEC
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ENABLE_HEX = 0
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ENABLE_PTR = 1 ; requires ENABLE_HEX
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ENABLE_STR = 1
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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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@ -260,61 +321,6 @@ DATA4
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; Pad until end of page so PrintM starts on new page
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ds 256 - <*
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/*
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Problem:
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We want to print this ...
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.byte "X=## Y=### $=####:@@ %%%%%%%%~????????"
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... without having to waste marking up literals with an escape character
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printf() on the 6502
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- is bloated by using a meta-character '%' instead of the high bit
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- doesn't provide a standard way to print binary *facepalm*
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- doesn't provide a standard way to print a deferenced pointer
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- 2 digit, 3 digit and 5 digit decimals requiring wasting a "width" character
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e.g. %2d, %3d, %5d
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Solution:
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Here is a micro replacement, printm()
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* Literals have the high byte set (APPLE text)
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* Meta characters have the high bit cleared (ASCII)
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x Hex 2 Byte
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$ Hex 4 Byte
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@ Ptr 2 Byte at pointer
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& Ptr 4 Byte at pointer
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# Dec 1 Byte (max 2 digits)
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d Dec 2 Byte (max 3 digits)
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u Dec 2 Byte (max 5 digits)
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% Bin 1 Byte normal one's and zeros
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? Bin 1 Byte inverse one's, normal zeroes
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a Str - APPLE text (high bit set), last char is ASCII
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s Str - C string, zero terminated
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p Str - Pascal string, first character is string length
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Note: The dummy address $C0DE is to force the assembler
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to generate a 16-bit address instead of optimizing a ZP operand
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To toggle features on / off
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*/
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ENABLE_BIN = 1
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ENABLE_DEC = 1
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ENABLE_BYTE = 1
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ENABLE_HEX = 1
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ENABLE_PTR = 1
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ENABLE_STR = 1
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; Self-Modifying variable aliases
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@ -322,8 +328,12 @@ ENABLE_STR = 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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.if ENABLE_HEX
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_nHexWidth = HexWidth +1
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.endif
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.if ENABLE_DEC
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_nDecWidth = DecWidth +1
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.endif ; ENABLE_DEC
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; printm( format, args, ... )
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; ======================================================================
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@ -338,6 +348,8 @@ NextArg
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STY _pFormat+1 ; hi
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BRA GetFormat ; always
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.if ENABLE_HEX
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; x Hex 2 Byte
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; $ Hex 4 Byte
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; ======================================================================
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@ -395,6 +407,7 @@ PrintReverseBCD
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BRA PrintReverseBCD
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.if ENABLE_PTR
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; @ Ptr 2 Byte
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; & Ptr 4 Byte
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; ======================================================================
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@ -433,6 +446,9 @@ _PrintPtr
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; TAY
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BRA PrintHexYX ; needs XYtoVal setup
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.endif ; ENABLE_PTR
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.endif ; ENABLE_HEX
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; ======================================================================
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Print
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@ -464,6 +480,7 @@ _Done
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; === Meta Ops ===
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.if ENABLE_DEC
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; # Dec 1 Byte (max 2 digits)
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; d Dec 2 Byte (max 3 digits)
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; u Dec 2 Byte (max 5 digits)
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@ -537,10 +554,10 @@ _BCD2Char
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DecWidth
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LDX #0 ; _nDecDigits NOTE: self modifying!
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JMP PrintReverseBCD
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.endif ; ENABLE_DEC
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.if ENABLE_BIN
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; % Bin 1 Byte normal one's and zeros
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; ? Bin 1 Byte inverse one's, normal zeroes
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; ======================================================================
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@ -568,14 +585,16 @@ _FlipBit
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JSR PutChar
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DEY
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BNE _Bit2Asc
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.endif ; ENABLE_BIN
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_JumpNextFormat
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; BRA NextFormat ; always
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JMP NextFormat ; JMP :-(
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.endif ; ENABLE_BIN
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; b Print a signed byte in decimal
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; ======================================================================
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.if ENABLE_DEC
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.if ENABLE_BYTE
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PrintByte
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JSR NxtArgYX ; X = low byte
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TXA
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@ -594,9 +613,11 @@ PrintBytePos
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LDA #3 ; 3 digits max
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STA _nDecWidth
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JMP PrintDecYX ; needs XYtoVal setup
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.endif ; ENABLE_BYTE
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.endif ; ENABLE_DEC
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.if ENABLE_STR
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; a String (APPLE text, last byte ASCII)
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; See: DCI
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; ======================================================================
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@ -635,7 +656,6 @@ PrintStrC
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; p String (Pascal)
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; ======================================================================
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PrintStrP
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; JMP PrintHex4 ; DEBUG
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JSR NxtArgToTemp
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LDY #$0
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@ -650,8 +670,7 @@ _PrintCharA
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DEX
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BNE _PrintStrP
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BEQ _JumpNextFormat ; always
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.endif ; ENABLE_STR
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.endif ; ENABLE_STR
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; __________ Utility __________
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@ -693,9 +712,8 @@ _NxtArgToTemp
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;
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; ======================================================================
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; Hex2/Hex4 temp
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_bcd ds 6 ; 6 chars for printing dec
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_val dw 0
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_val dw 0 ; PrintHex2 PrintHex4 temp
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MetaChar
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@ -745,10 +763,10 @@ MetaFunc
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.if ENABLE_HEX
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dw PrintHex4
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dw PrintHex2
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.endif
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.if ENABLE_PTR
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.if ENABLE_PTR
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dw PrintPtr4
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dw PrintPtr2
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.endif
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.endif
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.if ENABLE_STR
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dw PrintStrP
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