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cc65/libsrc/common/strcmp.s
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ArmAsm

;
; Ullrich von Bassewitz, 31.05.1998
;
; int strcmp (const char* s1, const char* s2);
;
.export _strcmp
.import popax
.importzp ptr1, ptr2
_strcmp:
sta ptr2 ; Save s2
stx ptr2+1
jsr popax ; Get s1
sta ptr1
stx ptr1+1
ldy #0
loop: lda (ptr1),y
cmp (ptr2),y
bne L1
tax ; end of strings?
beq L3
iny
bne loop
inc ptr1+1
inc ptr2+1
bne loop
L1: bcs L2
ldx #$FF
rts
L2: ldx #$01
L3: rts