al chu wrote:
I am learning IPCS and formating a control block using the model in IPCS.
I wrote a model using BLSQMDEF and BLSQMFLD, and compiled linkedited it.
The command CBF xxx MODEL(MODyyy) works fine. Most of fields look good and
readable.
However some fields are a double word STCK timestamp and some fields are a
double word which contains elapsed time in units of 16 microsecond.
I'd like format it nicely in HH:MM:SS.nnnnn format. I have no problem with
formatting if it is normal batch assembler program.
Questions I have;
Is it possible to format it using the model only? I searched the archive and
found Bob Wright's response to a similar question (dated Jul 13, 2006),
however it shows how to format flags using an additional model definition.
It is possible to rely on formatting support supplied with z/OS to do
the formatting of interest to you. The model processor allows a
BLSQMFLD macro to say that your big data area contains instances of
smaller data areas for which formatting support is provided by others, e.g.
BLSQMFLD NAME=BLSRDATC,OFF=ESSYD-ESSY,LEN=L'ESSYD, *
DECODE,CALLCBF,NEWLINE,MODELNAME,STACK,VIEW=X'0220'
I extracted the preceding from one of the models supplied by the IPCS
component of z/OS MVS. Translated to English it says that an instance
of a STRUCTURE(BLSRDATC) resides at offset ESSYD-ESSY and occupies
L'ESSYD bytes. IPCS is to invoke the formatter for that structure on
the next occasion that a break between output lines comes along if the
VIEW specified by the caller has any of the nonzero bits on in it that
match the X'0220' mask.
Appendix D of z/OS MVS IPCS Commands lists roughly 6 pages of structures
for which some special support is provided by z/OS. Most of the ones
listed include formatting support. Your question would seem to point to
the use of either TODCLOCK or TODCNULL formatters. (TODCNULL considers
an all-zero field of 8 bytes to be the absence of a valid TOD clock value.
Bob Wright - MVS Service Aids
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