mirror of
https://github.com/cc65/cc65.git
synced 2024-11-19 06:31:31 +00:00
20 lines
382 B
ArmAsm
20 lines
382 B
ArmAsm
;
|
|
; Ullrich von Bassewitz, 02.06.1998
|
|
;
|
|
; int toupper (int c);
|
|
;
|
|
|
|
.export _toupper
|
|
.import __ctype, __cdiff
|
|
|
|
_toupper:
|
|
tay ; Get c into Y
|
|
lda __ctype,y ; Get character classification
|
|
lsr a ; Get bit 0 (lower char) into carry
|
|
tya ; Get C back into A
|
|
bcc L9 ; Jump if not lower char
|
|
clc
|
|
adc __cdiff ; make upper case char
|
|
L9: rts ; CC are set
|
|
|