mirror of
https://github.com/cc65/cc65.git
synced 2024-11-18 00:07:21 +00:00
9ee0fa91e6
result. The actual conversion was ok. git-svn-id: svn://svn.cc65.org/cc65/trunk@5625 b7a2c559-68d2-44c3-8de9-860c34a00d81
48 lines
894 B
ArmAsm
48 lines
894 B
ArmAsm
;
|
|
; Ullrich von Bassewitz, 02.06.1998
|
|
;
|
|
; char* strlower (char* s);
|
|
; char* strlwr (char* s);
|
|
;
|
|
; Non-ANSI
|
|
;
|
|
|
|
.export _strlower, _strlwr
|
|
.import popax
|
|
.import __ctype
|
|
.importzp ptr1, ptr2
|
|
|
|
.include "ctype.inc"
|
|
|
|
_strlower:
|
|
_strlwr:
|
|
sta ptr1 ; Save s (working copy)
|
|
stx ptr1+1
|
|
sta ptr2
|
|
sta ptr2+1 ; save function result
|
|
ldy #0
|
|
|
|
loop: lda (ptr1),y ; get character
|
|
beq L9 ; jump if done
|
|
tax
|
|
lda __ctype,x ; get character classification
|
|
and #CT_UPPER ; upper case char?
|
|
beq L1 ; jump if no
|
|
txa ; get character back into accu
|
|
sec
|
|
sbc #<('A'-'a') ; make lower 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
|
|
|
|
|
|
|