;
; Ullrich von Bassewitz, 02.06.1998
;
; int tolower (int c);
;
.export _tolower
.import __ctype, __cdiff
_tolower:
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
tolower.s.html; generated on Sat Oct 13 22:41:32 2001 by ca65html