.ifndef INCLUDE_MEMCOPY
INCLUDE_MEMCOPY = 1

.include "system.h65"

.export memcopy

.code
;********************************************************************************
; @function Copy a block of memory to a different address
; @param ARG0-1: Source address
; @param ARG2-3: Target address
; @param y: Number of bytes to copy
;********************************************************************************
.proc memcopy
    cpy #0
    beq @rts
@copy_byte:
    dey
    lda (ARG0),y
    sta (ARG2),y
    cpy #0
    bne @copy_byte
@rts:
    rts
.endproc
.endif  ; guard