"IBM Mainframe Assembler List" <ASSEMBLER-LIST@LISTSERV.UGA.EDU> wrote on
02/24/2022 11:49:34 AM:
> Why not dispense with MODCB and just modify the RPL yourself using
> IFGRPL DSECT?
Well, it turns out that modifying the IKQRPL DSECT directly saved
2,224 bytes on my program size -- and my program still works (at least, as
much of it as I have tested up to this point). What I previously posted
was replaced by the following, which is 42 source lines shorter. Feel
free to point out any additional improvements that might be made. Thanks,
all.
L R8,FILERPL GET RPL ADDRESS
USING IKQRPL,R8 TEMPORARY ADDRESSABILITY
IF RQARG2,EQ,C'N',OR,RQARG2,EQ,C'P' IF NEXT/PREV
OI RPLOPT1,RPLSEQ SET SEQUENTIAL PROCESSING
NI RPLOPT1,X'FF'-RPLDIR NOT DIRECT PROCESSING
IF RQARG2,EQ,C'P' IF PREV
OI RPLOPT2,RPLBWD SET BACKWARD PROCESSING
ELSE ELSE NEXT
NI RPLOPT2,X'FF'-RPLBWD SET FORWARD PROCESSING
ENDIF ENDIF
ELSE BY KEY/RBA
NI RPLOPT2,X'FF'-RPLBWD SET FORWARD PROCESSING
IF RQARG2,EQ,C'R' BY RBA
NI RPLOPT1,X'FF'-RPLKEY NOT KEY PROCESSING
OI RPLOPT1,RPLADR SET ADR PROCESSING
ELSE BY KEY
OI RPLOPT1,RPLKEY SET KEY PROCESSING
NI RPLOPT1,X'FF'-RPLADR NOT ADR PROCESSING
IF RQARG3,EQ,C'G' IF GTEQ
OI RPLOPT2,RPLKGE SET KGE PROCESSING
NI RPLOPT2,X'FF'-RPLGEN NOT GENERIC PROCESSING
ELSE ELSE EQUAL
NI RPLOPT2,X'FF'-RPLKGE NOT KGE PROCESSING
NI RPLOPT2,X'FF'-RPLGEN NOT GENERIC PROCESSING
ENDIF ENDIF
ENDIF ENDIF
IF FILEOPT,(ON,TM),FILESEQU IF ACCESS IS SEQUENTIAL
OI RPLOPT1,RPLSEQ SET SEQ PROCESSING
NI RPLOPT1,X'FF'-RPLDIR NOT DIR PROCESSING
ELSE ACCESS IS DIRECT
NI RPLOPT1,X'FF'-RPLSEQ NOT SEQ PROCESSING
OI RPLOPT1,RPLDIR SET DIR PROCESSING
ENDIF ENDIF
ENDIF ENDIF
IF FILEOPT,(ON,TM),FILEUPDT IF OPENED FOR UPDATE
OI RPLOPT1,RPLUPD SET UPD PROCESSING
NI RPLOPT2,X'FF'-RPLNSP NOT NSP PROCESSING
NI RPLOPT2,X'FF'-RPLNUP NOT NUP PROCESSING
ELSE ELSE NOT UPDATE
NI RPLOPT1,X'FF'-RPLUPD NOT UPD PROCESSING
IF FILEOPT,(ON,TM),FILESEQU IF ACCESS IS SEQUENTIAL
NI RPLOPT2,X'FF'-RPLNSP NOT NSP PROCESSING
OI RPLOPT2,RPLNUP SET NUP PROCESSING
ELSE ELSE ACCESS IS DIRECT
OI RPLOPT2,RPLNSP SET NSP PROCESSING
NI RPLOPT2,X'FF'-RPLNUP NOT NUP PROCESSING
ENDIF ENDIF
ENDIF ENDIF
DROP R8 REMOVE ADDRESSABILITY
Sincerely,
Dave Clark
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