At 07:29 -0500 on 10/30/2009, McKown, John wrote about Re: An
Alternative Modest PARM Proposal:
Same problem with this as with all others. You have changed the
interface expected by OLD code. Suppose your old code is coded for
the current standard. If someone used a long PARM, then your old
code will fail. Any changes to this must keep the current interface
as it currently is.
OK. The current standard is a single FW (with the high bit set)
pointing at a HW with length followed by 0-100 bytes of data (the FW
being pointed to by R1).
Make the new method a 2 FW Parm list with FW 1 pointing at the old
100 character PARM and FW 2 (which is End of Parmlist flagged)
pointing at the new Long Parm. The only GOTHCHA with an old style
program is if it gets paranoid and actually checked the
end-of-parmlist flag on the single FW it expects to be passed to it.
BTW: There are a number of IBM utilities that ALREADY check the
length of their Parmlist since they support being launched by JCL
with a PARM and being CALLED with a real muli-parm parmlist (the 2nd
and subsequent parms often being DDN overrides).
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