mirror of
https://github.com/cc65/cc65.git
synced 2024-12-27 00:29:31 +00:00
46 lines
788 B
ArmAsm
46 lines
788 B
ArmAsm
|
;
|
||
|
|
; Ullrich von Bassewitz, 02.06.1998
|
||
|
|
;
|
||
|
|
; char* strupper (char* s);
|
||
|
|
; char* strupr (char* s);
|
||
|
|
;
|
||
|
|
; Non-ANSI
|
||
|
|
;
|
||
|
|
|
||
|
|
.export _strupper, _strupr
|
||
|
|
.import popax
|
||
|
|
.import __ctype, __cdiff
|
||
|
|
.importzp ptr1, ptr2
|
||
|
|
|
||
|
|
_strupper:
|
||
|
|
_strupr:
|
||
|
|
sta ptr1 ; Save s (working copy)
|
||
|
|
stx ptr1+1
|
||
|
|
sta ptr2
|
||
|
|
sta ptr2+2 ; save function result
|
||
|
|
ldy #0
|
||
|
|
|
||
|
|
loop: lda (ptr1),y ; get character
|
||
|
|
beq L9 ; jump if done
|
||
|
|
tax
|
||
|
|
lda __ctype,x ; get character classification
|
||
|
|
and #$01 ; lower case char?
|
||
|
|
beq L1 ; jump if no
|
||
|
|
txa ; get character back into accu
|
||
|
|
clc
|
||
|
|
adc __cdiff ; make upper case char
|
||
|
|
sta (ptr1),y ; store back
|
||
|
|
L1: iny ; next char
|
||
|
|
bne loop
|
||
|
|
inc ptr1+1 ; handle offset overflow
|
||
|
|
bne loop ; branch always
|
||
|
|
|
||
|
|
; Done, return the argument string
|
||
|
|
|
||
|
|
L9: lda ptr2
|
||
|
|
ldx ptr2+1
|
||
|
|
rts
|
||
|
|
|
||
|
|
|
||
|
|
|