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d83d12899b
This commit adds ?DUP IF guards to MOVE and MOVE- that make them exit when u is 0. Without these guards a DO loop was executed 65535 times instead of 0. In particular, this fixes a crash when "105 LOAD I " is executed immediately after boot. Block editor word "I" passes IBUF length (0) to MOVE- and MOVE in this case, causing a crash.
17 lines
429 B
Plaintext
17 lines
429 B
Plaintext
: MOVE ( a1 a2 u -- )
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?DUP IF ( u ) 0 DO ( a1 a2 )
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SWAP C@+ ( a2 a1+1 x )
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ROT C!+ ( a1+1 a2+1 )
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LOOP THEN 2DROP ;
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: MOVE- ( a1 a2 u -- )
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?DUP IF TUCK + 1- ( a1 u a2+u-1 )
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ROT 2 PICK + 1- ( u a2+u-1 a1+u-1 )
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ROT ( u ) 0 DO ( a2 a1 )
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C@- ( a2 a1-1 x )
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ROT C!- ( a1-1 a2-1 ) SWAP ( a2 a1 )
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LOOP THEN 2DROP ;
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: MOVE, ( a u -- ) H@ OVER ALLOT SWAP MOVE ;
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: PREV 3 - DUP @ - ;
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