DECC$WRITE_SHORT_RECORDS

   The DECC$WRITE_SHORT_RECORDS feature logical supports a previous
   change to the fwrite function (to accommodate writing records
   with size less than the maximum record size), while retaining
   the legacy way of writing records to a fixed-length file as the
   default behavior:

   With DECC$WRITE_SHORT_RECORDS enabled, short-sized records
   (records with size less than the maximum record size) written at
   EOF are padded with zeros to align records on record boundaries.
   This is the behavior seen in OpenVMS Version 7.3-1 and some ACRTL
   ECOs of that time period.

   With DECC$WRITE_SHORT_RECORDS disabled, the legacy behavior
   of writing records with no padding is implemented. This is the
   recommended and default behavior.