If the current JCL PARM format change from HW + 0-100 bytes to HW + 100 bytes + FW for the new long parm + 0-??? bytes long parm, are there any backward compatibility problems ?
Regards, Thomas Berg __________________________________________ Thomas Berg Specialist IT-U SWEDBANK > -----Ursprungligt meddelande----- > Från: IBM Mainframe Discussion List > [mailto:ibm-m...@bama.ua.edu] För Shmuel Metz (Seymour J.) > Skickat: den 1 november 2009 18:56 > Till: IBM-MAIN@bama.ua.edu > Ämne: Re: An Alternative Modest PARM Proposal > > In <p0624080ac7110bd5f...@[192.168.1.11]>, on 10/30/2009 > at 05:42 PM, "Robert A. Rosenberg" <hal9...@panix.com> said: > > >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). > > No, the current standard is that bit 0 indicates the end of > the list and that the first word points to a halfword length > followed by characters. > The 100 character limit is strictly a C/I limited, and > various IBM utilities accept longer parms. > > >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. > > That would break compatibility badly. > > >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). > > Which is one of the reasons why your suggestion won't fly. > > BTW, I had forgotten about an old (1995) post from Don Ault > in which he said that IBM will not implement long parms in a > fashion incompatible with the existing interface. He left it > open as to whether the length field would be signed or unsigned. > > -- > Shmuel (Seymour J.) Metz, SysProg and JOAT > ISO position; see <http://patriot.net/~shmuel/resume/brief.html> > We don't care. We don't have to care, we're Congress. > (S877: The Shut up and Eat Your spam act of 2003) > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access > instructions, send email to lists...@bama.ua.edu with the > message: GET IBM-MAIN INFO Search the archives at > http://bama.ua.edu/archives/ibm-main.html > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
