mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-12-11 09:49:17 +00:00
97 lines
1.8 KiB
Plaintext
97 lines
1.8 KiB
Plaintext
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*
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STRCAT
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*
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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 :MLEN
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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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LDY #0
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LDA (ADDR1),Y
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STA :S1LEN
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STA :S1IND
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INC :S1IND
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LDA (ADDR2),Y
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STA :S2LEN
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LDA #1
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STA :S2IND
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LDA :S2LEN
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CLC
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ADC :S1LEN
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STA :S3LEN
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BCS :TOOLONG
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CMP :MLEN
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BEQ :LENOK
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BCC :LENOK
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:TOOLONG
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LDA #$0FF
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STA :SOVF
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LDA :MLEN
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SEC
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SBC :S1LEN
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BCC :EXIT
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STA :SCNT
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LDA :MLEN
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STA :S1LEN
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JMP :DOCAT
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:LENOK
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STA :S1LEN
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LDA #0
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STA :SOVF
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LDA :S2LEN
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STA :SCNT
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:DOCAT
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LDA :SCNT
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BEQ :EXIT
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:CATLP
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LDY :S2IND
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LDA (ADDR2),Y
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LDY :S1IND
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STA (ADDR1),Y
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INC :S1IND
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INC :S2IND
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DEC :SCNT
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BNE :CATLP
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:EXIT
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LDA :S1LEN
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LDY #0
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STA (ADDR1),Y
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LDA :SOVF
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ROR A
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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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LDY #0
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LDA (ADDR1),Y
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STA RETLEN
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LDA #1
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:RLP
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LDA (ADDR1),Y
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STA RETURN,Y
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CPY RETLEN
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INY
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BNE :RLP
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LDA RETLEN
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LDY #0
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STA (ADDR1),Y
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LDX :S3LEN
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RTS
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:S3LEN DS 1
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:S1LEN DS 1
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:S1IND DS 1
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:S2LEN DS 1
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:S2IND DS 1
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:MLEN DS 1
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:SCNT DS 1
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:SOVF DS 1
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