Peter Hunkeler quotes someone as posting the query
can you cite a source for "programs are expected to reserve 100
bytes for the PARM"?
I hope no such source can be found in an IBM publication. It would be
wrong. The PARM= storage is NOT of the form exhibited in the PL/I
declaration
declare PARM character varying(100) ;
for which 100 bytes preceded by a halfword current-length indicator is used.
It is instead of the self-defining (again PL/I) form
declare 1 PB based,
2 cpvl binary fixed(15,0), /* current-length prefix */
2 PARM character(0 refer(PB.cpvl)) ; /* PARM value */
with the side condition that the value of PB.cpvl may not exceed 100.
Since the halfword prefix can be examined before, exceptionally, a copy of a
particular PARM value is made, there is never any need to allocate more
storage than that PARM value occupies for such a copy.
John Gilmore
Ashland, MA 01721
U.S.A.
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