

	Extended FCS routines for DECUS "C"


These routines allow the "C" programmer on RSX to use some of the
more advanced FCS functions including preallocation files, creating 
fixed record size files with record lengths other that 512, randomly
reading and writing a disk block or more at a time, and reading and 
writing a random access, fixed record size file.

FOPENX.C provides the extended file open command. It takes advantage 
of the existing DECUS "C" fopen() function, modified to leave out 
the actual file open call. This code is contained in FDBSET.MAC. 

Fopenx() calls FDBSET to setup the filename block, the "C" runtime 
system and the FDB. The FDB is modified to request the desired open 
options, and OPNFNB is called to complete to open.

Fopenx() can be extended further, the entire FDB is at your 
disposal.


		FGETB, FPUTB, FGETR, FPUTR

Fgetb() and Fputb() provide a simple way to read and write disk 
blocks. They use the qio routine internal to the DECUS "C" runtime 
library, so can be used in task that do not reference the CX 
library. These routines are much, much faster that the normal "C" 
fget and fput if you just need to manipulate disk blocks.

Fgetr() and Fputr() are direct implementations of the getr$ and 
putr$ macros in the FCS library. I had a task written in macro that 
required extensive changes. Rather that fighting with macro, I 
rewrote the taks in "C", and needed these routines.


		Building Everything

You should assemble or compile all the .MAC and .C file, then insert 
the object modules into a library. We added them to C.OLB, but you 
may want to keep them in a separate library if you want to keep a 
stock C.OLB.

The documentation is embedded in the source modules. You can 
generate the .RNO files by using GETRNO from the DECUS "C" kit. See 
the README.1ST file in the other A.P. submission.


Questions, complaints, praise (I rather like the last) can be 
addressed to:

	Hans J. Jung
	Assistant Manager of Research and Development
	The Associated Press
	50 Rockerfeller Plaza
	New York, NY 10020
	(212) 621-1568

I will take calls, but am notoriously hard to reach by phone. I also 
can't guarantee you much phone time.
