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Handle arguments outside char range correctly

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git-svn-id: svn://svn.cc65.org/cc65/trunk@1501 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz 2002-11-11 11:58:20 +00:00
parent c9fb9cb7b4
commit bafba1d673
2 changed files with 6 additions and 2 deletions
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6
libsrc/common/tolower.s
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@ -8,12 +8,14 @@
.import __ctype, __cdiff
_tolower:
cpx #$00 ; Outside valid range?
bne L9 ; If so, return the argument unchanged
tay ; Get C into Y
lda __ctype,y ; Get character classification
lsr a
lsr a ; Get bit 1 (upper case char) into carry
tya ; Get char back into A
bcc L9 ; Jump if no upper case char
sbc __cdiff ; make lower case char (carry already set)
L9: rts ; CC are set
sbc __cdiff ; Make lower case char (carry already set)
L9: rts

2
libsrc/common/toupper.s
View File

@ -8,6 +8,8 @@
.import __ctype, __cdiff
_toupper:
cpx #$00 ; Outside valid range?
bne L9 ; If so, return the argument unchanged
tay ; Get c into Y
lda __ctype,y ; Get character classification
lsr a ; Get bit 0 (lower char) into carry