mirror of
https://github.com/cc65/cc65.git
synced 2024-12-26 08:32:00 +00:00
29 lines
845 B
ArmAsm
29 lines
845 B
ArmAsm
; toupper.s
|
|
;
|
|
; This file is part of
|
|
; cc65 - a freeware C compiler for 6502 based systems
|
|
;
|
|
; https://cc65.github.io
|
|
;
|
|
; See "LICENSE" file for legal information.
|
|
;
|
|
; int toupper (int c);
|
|
;
|
|
|
|
.export _toupper
|
|
.include "ctype.inc"
|
|
.import ctypemaskdirect
|
|
|
|
_toupper:
|
|
cpx #$00 ; out of range?
|
|
bne @L2 ; if so, return the argument unchanged
|
|
tay ; save char
|
|
jsr ctypemaskdirect ; get character classification
|
|
and #CT_LOWER ; lower case char?
|
|
beq @L1 ; jump if no
|
|
tya ; restore char
|
|
adc #<('A'-'a') ; make upper case char (ctypemaskdirect ensures carry clear)
|
|
rts
|
|
@L1: tya ; restore char
|
|
@L2: rts
|