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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