On 2/3/25 12:10 PM, Andi McClure wrote:
(This is an attempt to reply to a Mon Feb 3 19:09:38 GMT 2025 message by
Steve Kargl.)
> I believe that you are misreading C1223. The file is
> opened with form='unformatted'.
Hm, okay. I guess it comes down to whether you "diagram" the sentence in
the spec as "An ADVANCE= specifier shall appear only in a formatted
(sequential or stream) data transfer statement" or "An ADVANCE=
specifier shall appear only in a (formatted sequential) or (stream data
transfer) statement". If you interpret it the first way the gfortran
behavior is correct (although the error message could be improved…), if
you interpret it the second way gfortran is incorrect.
> PS: You're looking for the INQUIRE statement.
In the context of the program I was trying to write, INQUIRE can be used
to get the byte length of the file. That is not something I was trying
to do. The data was structured, and needed to be parsed to determine the
allocation size. In other words INQUIRE is the equivalent of C ftell()
and I am looking for the equivalent of C fseek(). (Which the standard
appears to only offer through nonadvancing reads… which gfortran appears
to disallow for an unformatted stream file. Unless you do the "silly"
thing I eventually did, which is to bundle your seek together with the
next advancing read.)
Thanks for the information.
This mailing list is intended for developers and contributors.
I suggest you post your Fortran questions to this group which is a lot
of users.
https://fortran-lang.discourse.group/
Regards,
Jerry
