pos_byte--; /* rewind POS_BYTE */
ptr = BYTE_POS_ADDR (pos_byte);
MULTIBYTE_BYTES_WIDTH (ptr, dp, mb_bytes, mb_width);
pos_byte += mb_bytes;
pos_byte--; /* rewind POS_BYTE */
ptr = BYTE_POS_ADDR (pos_byte);
MULTIBYTE_BYTES_WIDTH (ptr, dp, mb_bytes, mb_width);
pos_byte += mb_bytes;