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INFOR$–Internal Format Table Interface Routines
12.1. Format of the Internal Format Table
See Appendix G for the structure of the INFOR table and the identifiers used to
reference the information it contains.
12.2. General Considerations for Using the INFOR
Routines
If the calling program uses the relocatable version of the INFOR$ routines, the INFOR$
routine allocates a 28-word packet under location counter 2. Normally this results in the
area being defined in the calling program data bank. The actual location of the packet
can be specified by the calling program through the use of Collector directives that
define where data items under specific location counters are to be put. The following
data area labels are externally defined by the relocatable version of the INFOR$ routines.
These labels reference data areas in the 28-word packet and, since they are externalized,
they can be used by the calling program.
INFOR$
Flag used by RINF$ to determine if the INFOR table has already been read.
INFOR$+1
FILE$
ELT$
Contents of A0 after first READ$ performed by RINF$ (status bits, CLIST$ index, and
so on).
Edited file name from DUSE$ (8 words).
Field description table from SELT$ (14 words).
If the calling program uses the common bank form of the INFOR$ routines, the calling
program must provide a 30-word packet in a write-enabled bank that is based when the
call to the INFOR$ routine is made. This packet can be generated by including a call to
the procedure I$NFORPKT in the calling program code. This procedure reserves 30
words of space and externalizes the data area tags INFOR$, FILE$, and ELT$. (See the
definitions for INFOR$, FILE$, and ELT$ listed above.)
The I$NFORPKT procedure should not be used when the relocatable version of INFOR$
is called because the procedure I$NFORPKT and the relocatable version of INFOR$
externalizes these tags.
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