61 lines
1.1 KiB
Text
61 lines
1.1 KiB
Text
StripComments:
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;prints a string but stops at the comment character
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;INPUT: D7 = comment character(s) of choice
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;A0 = source address of string
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;up to four can be used, each takes up a different 8 bits of the register
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;to omit an argument, leave its bits as zero.
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.loop:
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MOVE.B (A0)+,D0
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CMP.B #0,D0 ;check for null terminator
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beq .done
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CMP.B D7,D0 ;check the first comment char
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beq .done
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ROR.L #8,D7
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CMP.B D7,D0 ;check the second comment char
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beq .done
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ROR.L #8,D7
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CMP.B D7,D0 ;check the third comment char
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beq .done
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ROR.L #8,D7
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CMP.B D7,D0 ;check the fourth comment char
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beq .done
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ROR.L #8,D7
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CMP.B #' ',D0
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BNE dontCheckNext
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MOVE.B (A0),D1 ;look ahead one character, if that character is a comment char or null terminator, stop here
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CMP.B #0,D1
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beq .done
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CMP.B D7,D1
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beq .done
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ROR.L #8,D7
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CMP.B D7,D1
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beq .done
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ROR.L #8,D7
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CMP.B D7,D1
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beq .done
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ROR.L #8,D7
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CMP.B D7,D1
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beq .done
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ROR.L #8,D7
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dontCheckNext:
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jsr PrintChar
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bra .loop
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.done:
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rts
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TestString:
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dc.b "apples ; pears # and bananas",0
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