mirror of https://github.com/RevCurtisP/C02.git
38 lines
1.6 KiB
Plaintext
38 lines
1.6 KiB
Plaintext
;Module ARGS generic ARGGET routinr
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;argget(s) - Read Next Argument into String s
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;Args: X,Y - Address of String
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;Uses: SYSBFR - System Buffer
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; SYSBFL - System Buffer Length
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;Sets: DSTPTR - Address of String
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;Updates: SYSBFP - System Buffer Position
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;Returns: A,Y = Argument Length
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; X = New System Buffer Position
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ARGGET: JSR SETDST ;Set Destination Pointer
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LDY #0 ;Initialize Destination Index
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LDX SYSBFP ;Get System Buffer Position
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.GLOOP: LDA SYSBFR,X ;Get Next Character
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BEQ .GDONE ;If String Terminator
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CMP #ARGTRM ;or Argument Terminator
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BEQ .GDONE ; Terminate String and Return
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CMP #ARGDLM ;Else If Argument Delimiter
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BNE .GSKIP ;
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INX ; Bump Buffer Index Past Delimiter
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CPY #0 ; If Leading Space
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BEQ .GLOOP ; Check Next Character
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BNE .GDONE ; Terminate String and Returns
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.GSKIP LDA SYSBFR,X ;Else Get Character from Buffer
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AND #ARGMSK ; Apply Bit Mask
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STA (DSTPTR),Y ; Copy to Destination String
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INY ; Increment Destination Index
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BMI .GDONE ; If > 128, Return as Length
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INX ; Increment Buffer Index
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CPX #SYSBFL ; If Less Than Buffer Length
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BCC .GLOOP ; Loop
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.GDONE LDA #0 ;
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STA (DSTPTR),Y ;Terminate Destination String
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.GRTRN STX SYSBFP ;Set System Buffer Position
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TYA ;Return Argument Length
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RTS
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