mirror of
https://github.com/cc65/cc65.git
synced 2024-07-07 04:29:01 +00:00
23 lines
404 B
ArmAsm
23 lines
404 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
|
||
|
|
and #$01 ; Mask lower char bit
|
||
|
|
beq L1 ; Jump if not lower char
|
||
|
|
tya ; Get C back into A
|
||
|
|
clc
|
||
|
|
adc __cdiff ; make upper case char
|
||
|
|
rts ; CC are set
|
||
|
|
|
||
|
|
L1: tya ; Get C back
|
||
|
|
rts ; CC are set
|
||
|
|
|