This function can be used for strings allocated with the ALLOCSTR@
routine. ALLOCSTR@ and GETSTR@ provide a simple way of storing and retrieving
large amounts of character information for which a maximum possible length of
each element is known, but where if all trailing spaces were stored the amount
of memory required would be excessive. For example, lines of text destined for
screen display could be stored in this way (usually a maximum of 80 characters,
but often with much trailing space).
Another application of this routine is for C string entities passed to Fortran