HPFS and IBM C/2, part two

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4 total messages Started by Paul Rolland Tue, 16 Apr 1991 18:33

#2543

Author: Paul Rolland
Date: Tue, 16 Apr 1991 18:33

25 lines
1620 bytes

Hi Networkers,
	
	
	Another question about OS/2, HPFS and the OS/2 calls to file function.
In my previous message, I told that I couldn't access a file on an HPFS disk
with the C/2 open and fopen functions. So, I used the OS/2 call DosOpen.
And then, suprise. I thought HPFS could handle long file name... So, I tried
to DosOpen the file ROUTETABLE.DATA, but it fails, returning me the error
206 (FILENAME_EXCED_RANGE). So, I had to reduce it to ROUTE.TAB, without 
changing anything else... and it works ! But my manual tells me that :
'the High Performance File System (HPFS) permits having many parts in a name 
if each part is separated by a period.' and 'Generally, long file names support
255 characters per name part; the HPFS names support 254.' [from IBM 
Operating System Extended Edition Version 1.2 User's Guide Volume 1: Base
Operating System]

	My question is : WHY ? Why can't I access a file that is fully 
supported by the file system ?

	Paul.

 Paul Rolland, engineer [I hope :)] in July 91,
 Specialist of assembly on PC [Not too bad in fact :)],
 Trying to progress on Unix administration
 					   Email : rol@grasp1.univ-lyon1.fr

Re: HPFS and IBM C/2, part two

#2546

Author: Ramesh_Rama_Pendakur
Date: Wed, 17 Apr 1991 00:00

9 lines
715 bytes

I don't know about your version of the Operating System, but in OS/2 1.3
the better way would be to use DosOpen2. As for C Run-time support, it 
might use the old version of DosOpen. 

Just a wild guess. Try it anyway. Post the results if you would.



	- ... -

Re: HPFS and IBM C/2, part two

#2547

Author: Alan Ballard
Date: Wed, 17 Apr 1991 04:56

13 lines
1198 bytes

In article <41343@cup.portal.com> Ramesh_Rama_Pendakur@cup.portal.com writes:
>the better way would be to use DosOpen2. As for C Run-time support, it 
>might use the old version of DosOpen. 
 
Whether you use fopen , DosOpen, or DosOpen2 isn't relevent.  Whether the 
program is long-name-aware or not is what matters. 
 
(Time for a FAQ list for this group, maybe.)

Alan Ballard                   | Internet: ballard@ucs.ubc.ca
University Computing Services  |   Bitnet: USERAB1@UBCMTSG
University of British Columbia |    Phone: 604-822-3074
Vancouver B.C. Canada V6R 1Z2  |      Fax: 604-822-5116

Re: HPFS and IBM C/2, part two

#2553

Author: Mikael Wahlgren
Date: Wed, 17 Apr 1991 22:45

19 lines
1481 bytes

In article <41343@cup.portal.com> Ramesh_Rama_Pendakur@cup.portal.com writes:
>I don't know about your version of the Operating System, but in OS/2 1.3
>the better way would be to use DosOpen2. As for C Run-time support, it 
>might use the old version of DosOpen. 
>Just a wild guess. Try it anyway. Post the results if you would.

This is dead WRONG, and so it was a couple of weeks ago when someone told
the same thing.

The -2 calls (like DosOpen2) are NOT for HPFS support, but for Extended
Attribute linking.  The "old" API's fully support the HPFS long filenames,
and the only thing you have to do is to use the DosOpen call and set the
NEWFILES flag in your EXE-header.

If you use a C-function for opening a file (like fopen), this should also
be OK with HPFS long filenames, but you have to check that the library
reserves enough space for your filename.

Mikael Wahlgren      d9mikael@dtek.chalmers.se

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