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        .file   "strncpy.S"

        .section .text

        .global  _strncpy

        .type    _strncpy,@function

_strncpy:

        mov     r1, r4          ; Save a copy of the dest pointer.

        mov     r3, r5          ; Save a copy of the byte count

        smovu                   ; Copy the bytes

        cmp     #0, r3          ; If we have copied the number of bytes requested

        beq     1f              ;  then skip the next bit:

        add     r4, r5, r1      ; Point to the last byte that we are supposed to write.

        sub     r3, r1          ; Subtract the number of bytes left to be written.

        mov     #0, r2          ; Fill the remaining bytes with NULs,

        sstr.b

1:

        mov     r4, r1          ; Return the destination pointer

        rts