mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-11-28 03:52:10 +00:00
80 lines
1.5 KiB
Plaintext
80 lines
1.5 KiB
Plaintext
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SUBPOS
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PLA
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STA RETADR
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PLA
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STA RETADR+1
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PLA
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STA ADDR2
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PLA
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STA ADDR2+1
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PLA
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STA ADDR1
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PLA
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STA ADDR1+1
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LDA RETADR+1
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PHA
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LDA RETADR
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PHA
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:POS
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LDY #0
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LDA (ADDR1),Y
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BEQ :NOTFND
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STA :SLEN
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LDA (ADDR2),Y
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BEQ :NOTFND
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STA :SUBLEN
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LDA :SUBLEN
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CMP :SLEN
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BEQ :LENOK
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BCS :NOTFND
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:LENOK
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LDA #1
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STA :SINDEX
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LDA :SLEN
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SEC
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SBC :SUBLEN
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STA :SCOUNT
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INC :SCOUNT
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:SLP1
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LDA :SINDEX
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STA :SIDX
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LDA #1
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STA :SUBIDX
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:CMPLP
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LDY :SIDX
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LDA (ADDR1),Y
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LDY :SUBIDX
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CMP (ADDR2),Y
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BNE :SLP2
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LDY :SUBIDX
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CPY :SUBLEN
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BEQ :FOUND
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INY
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STY :SUBIDX
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INC :SIDX
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JMP :CMPLP
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:SLP2
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INC :SINDEX
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DEC :SCOUNT
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BNE :SLP1
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BEQ :NOTFND
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:FOUND
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LDA :SINDEX
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JMP :EXIT
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:NOTFND
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LDA #0
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:EXIT
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STA RETURN
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LDY #1
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STY RETLEN
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RTS
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:SLEN DS 1
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:SUBLEN DS 1
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:SINDEX DS 1
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:SUBIDX DS 1
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:SCOUNT DS 1
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:SIDX DS 1
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