mirror of
https://github.com/cc65/cc65.git
synced 2024-06-27 12:29:33 +00:00
22 lines
668 B
ArmAsm
22 lines
668 B
ArmAsm
;
|
|
; Ullrich von Bassewitz, 02.06.1998
|
|
;
|
|
; int toupper (int c);
|
|
;
|
|
|
|
.export _toupper
|
|
.import __ctype
|
|
|
|
_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
|
|
tya ; Get C back into A
|
|
bcc L9 ; Jump if not lower char
|
|
clc
|
|
adc #<('A'-'a') ; make upper case char
|
|
L9: rts ; CC are set
|
|
|