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Fixed strskip

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Strskip wasn't preserving a properly. The new code uses the shadow af register, so whilst a byte and 4 cycles have been added outside the loop, it's safer and cleaner. The flags register isn't affected, but since the search goes for up to 64Kb I think it's safe to say the end of the string will always be reached.
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Clanmaster21 2020-01-09 14:20:27 +00:00 committed by GitHub
parent aa2852628b
commit 145eb65a8e
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1 changed files with 3 additions and 3 deletions
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6
apps/lib/util.asm
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@ -80,16 +80,16 @@ strcmp:
; Given a string at (HL), move HL until it points to the end of that string. ; Given a string at (HL), move HL until it points to the end of that string.
strskip: strskip:
push bc push bc
ld b, a ex af, af'
xor a ; look for null char xor a ; look for null char
ld b, a
ld c, a ld c, a
cpir ; advances HL regardless of comparison, so goes one too far cpir ; advances HL regardless of comparison, so goes one too far
dec hl dec hl
ld a, b ex af, af'
pop bc pop bc
ret ret
; Returns length of string at (HL) in A. ; Returns length of string at (HL) in A.
; Doesn't include null termination. ; Doesn't include null termination.
strlen: strlen: