31a58d00f1
Among random "better safe than sorry" changes, the real fix is in changing "4" for "5" above _find declaration. This off-by-one error had that word, which is the root word in z80, have a 0x01 prev field instead of a 0x00 one. When all memory was initialized to zero, it didn't matter, we ended up hitting 0 prev and considered ourselves properly at the end of dict. When memory wasn't initialized, however, we would end up jumping at all kinds of places, leading to random behavior.
17 行
686 B
Plaintext
17 行
686 B
Plaintext
( Native words )
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H@ 5 + XCURRENT ! ( make next CODE have 0 prev field )
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CODE _find ( cur w -- a f )
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HL POP, ( w ) DE POP, ( cur ) chkPS,
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HL PUSH, ( --> lvl 1 )
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( First, figure out string len )
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A (HL) LDrr, A ORr,
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( special case. zero len? we never find anything. )
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IFZ, PUSH0, JPNEXT, THEN,
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BC PUSH, ( --> lvl 2, protect )
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( Let's do something weird: We'll hold HL by the *tail*.
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Because of our dict structure and because we know our
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lengths, it's easier to compare starting from the end. )
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C A LDrr, B 0 LDri, ( C holds our length )
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BC ADDHLd, HL INCd, ( HL points to after-last-char )
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( cont . )
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