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SDFI, SDFO–System Data Format I/O Routines
21.2.2. Calling Sequence
The following subsections explain how to open the System Data Format Output routine,
read an image, and close it.
21.2.2.1. Open SDFO
The calling program must open SDFO before any images can be written. There are two
entry points that perform the open function.
SDFOO$ Open SDFO for any file type
SDFOOSF$ Open SDFO for a sector-formatted file
When the SDFOO$ entry point is called, SDFO initializes the packet for writing to the file
or element. If the output file type is known to be sector-formatted, the SDFOOSF$ entry
point should be used. This entry point is the same as SDFOO$ except that SDFO does
not need to perform an ER FITEM$.
Calling Sequence for SDFOO$
Auto Switch Common Bank or Relocatable Relocatable
L,U A0,address-of-packet
LMJ X11,CBSDFOO$-1
normal return
Calling Sequence for SDFOOSF$
L,U A0,address-of-packet
I$BJ X11,CBSDFOO$
normal return
L,U A0,address-of-packet
LMJ X11,SDFOO$
normal return
Auto Switch Common Bank or Relocatable Relocatable
L,U A0,address-of-packet
LMJ X11,CBSDFOOSF$-1
normal return
L,U A0,address-of-packet
I$BJ X11,CBSDFOOSF$
normal return
L,U A0,address-of-packet
LMJ X11,SDFOOSF$
normal return
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