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cc65/libsrc/common/strcpy.s
cuz ebb44b8a4f Another small optimization
git-svn-id: svn://svn.cc65.org/cc65/trunk@2150 b7a2c559-68d2-44c3-8de9-860c34a00d81
2003-05-05 17:07:14 +00:00

31 lines
400 B
ArmAsm

;
; Ullrich von Bassewitz, 31.05.1998
;
; char* strcpy (char* dest, const char* src);
;
.export _strcpy
.import popax
.importzp ptr1, ptr2
_strcpy:
sta ptr1 ; Save src
stx ptr1+1
jsr popax ; Get dest
sta ptr2
stx ptr2+1
ldy #$00
L1: lda (ptr1),y
sta (ptr2),y
beq L9
iny
bne L1
inc ptr1+1
inc ptr2+1
bne L1
L9: lda ptr2 ; X still contains high byte
rts