Re: Fortran data file -> ADA data file?

[Dan Nagle <dnagle@erols.com>]

Hello,

Question:

Are the Fortran files sequential access or direct access?

The Fortran standard does not specify the means of file storage,
but a common practice has evolved.

If the file is a sequential access unformatted file, then
one likely has for each record:

<4 bytes of record length>user's data<4 bytes of record length>

There may or may not be a physical endfile record.

If the file is a direct access unformatted file, then
one likely has a "pure data" file where the record is located
by using the record length specified on the Fortran open statement
and the record number (i.e., seek ((record number) - 1) * recl).
There may (or may not) be an invisible-to-the-Fortran-programmer
record 0 which contains whatever the Fortran rtl writer
thought was needed.  If so, the formula is seek
((record number) - 1) * recl + (length of record 0)

Of course, the above is all modulo endian issues.

HTH

BTW, Fortran, like Ada, is spelled with the initial only
in upper case.

-- 
Cheers!

Dan Nagle
Purple Sage Computing Solutions, Inc.

On Tue, 16 Jul 2002 08:41:47 -0400, default <default@res.raytheon.com>
wrote:

>
>Would ADA be able to process unformatted record files from FORTRAN?  I
>am trying to port some FORTRAN code to ADA and this seems like the only
>hurdle I may have.  Any input is greatly appreciated.