lset - copy string in place, left-justified
struct string *buf, *str;
Lset copies the string pointed to by str into the string
pointed to by buf. The copy is performed in place, i.e., without
re-allocating or moving the text buffer of the target string. This facilitates
the manipulation of random buffer fields. If the source string str
is longer than the target string buf, the copy is truncated;
if the source is shorter than the target, the text is left-justified
and the target is padded on the right with blanks.
This function implements the LSET statement.
The Basmark QuickBASIC Programmerís Manual