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fix tolower/toupper to work with EOF/-1

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This commit is contained in:
Kelvin Sherlock 2017-10-31 13:18:36 -04:00
parent 578bda8439
commit 6ebb56af57
1 changed files with 6 additions and 2 deletions
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8
ctype.asm
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@ -498,6 +498,8 @@ tolower start
pla
sta 1,S
txa
bmi lb2
lda >__ctype+1,X branch if the character is not uppercase
and #_upper
beq lb1
@ -506,7 +508,7 @@ tolower start
rtl
lb1 txa return the input character
rtl
lb2 rtl
end
****************************************************************
@ -530,6 +532,8 @@ toupper start
pla
sta 1,S
txa
bmi lb2
lda >__ctype+1,X branch if the character is not lowercase
and #_lower
beq lb1
@ -538,7 +542,7 @@ toupper start
rtl
lb1 txa return the input character
rtl
lb2 rtl
end
****************************************************************