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SDFI, SDFO–System Data Format I/O Routines
21.1.2.3. Close SDFI
After all the images are read, the calling program must close SDFI by calling the SDFIC$
entry point. This completes the SDFI read operation.
Calling Sequence for SDFIC$
Auto Switch Common Bank or Relocatable Relocatable
L,U A0,address-of-packet
LMJ X11,CBSDFIC$-1
normal return
L,U A0,address-of-packet
I$BJ X11,CBSDFIC$
normal return
L,U A0,address-of-packet
LMJ X11,SDFIC$
normal return
21.2. SDFO–System Data Format Output Routine
SDFO writes images one at a time from the calling program to an SDF file or element.
SDFO has the following functions and entry points:
• Open SDFO (SDFOO$, SDFOOSF$)
• Write an image (SDFO$)
• Close SDFO (SDFOC$)
The calling program must open SDFO before writing images to the file or element and
close SDFO after all images are written.
The packet (or FCT) for SDFO is described in 21.2.1. The open, write, and close
functions of SDFO are described in 21.2.2.1, 21.2.2.2, and 21.2.2.3, respectively.
21.2.1. Packet
The calling program must provide an 11-word packet for SDFO. The packet (or FCT) for
SDFO is described in Figure 21–2. The packet may be generated with the S$DFCT
procedure, described in 21.2.1.2.
The same 11-word packet should not be used for both SDFI and SDFO.
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