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Subject: Re: DJGPP on NTF with SFN creating disabled [was : gcc-8.1.0 packages
 for testing]
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From: "Andris Pavenis (andris DOT pavenis AT iki DOT fi) [via djgpp-workers AT delorie DOT com]" <djgpp-workers AT delorie DOT com>
Message-ID: <3569b441-e678-7252-ffdd-7c45f72a5c56@iki.fi>
Date: Mon, 7 May 2018 18:48:52 +0300
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On 05/06/2018 10:53 PM, Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via djgpp-workers AT delorie DOT com] 
wrote:
> Am 05.05.2018 16:04, schrieb Andris Pavenis (andris DOT pavenis AT iki DOT fi) [via djgpp-workers AT delorie DOT com]:

>> It is easy to test with any simple test program that tries to open file with LFN preasent and 
>> SFN missing.
>>
>> 1) disable SFN creating according to Microsoft instructions and reboot. It will not affect any 
>> already existing file for which SFN is already present
>> (https://support.microsoft.com/en-us/help/121007/how-to-disable-8-3-file-name-creation-on-ntfs-partitions) 
>>
>> 2) create some file lite test.file.1 (you can even do it with DJGPP tools as creating file works)
>> 3) reenable SFN creating in registry and reboot to prevent problems with files created later
>>
>> After that You have a test file with missing SFN (one can try 'LFN=N ls -l' to verify that SFN 
>> is missing.
>> 'cat test.file.1' is after that expected to fail. For debugging plain opening file for reading 
>> is sufficient for testing.
>>
>> Andris
>
> OK, I was able to reproduce this for Win2K and WinXP when they read/write on NTFS formated 
> partitions.
> Have you already designed any fix for this issue?  Is there any fix conceivable for this issue when
> only long filenames have been created?  IIRC on FAT file systems the short file name is created 
> first
> and then the long file name is assigned to it.  A long file name without a short filename does 
> not exist,
> or am I missing something?
>

It seems that DJGPP mailing list has at least partial fix:

http://www.delorie.com/djgpp/mail-archives/browse.cgi?p=djgpp/2016/05/14/13:45:09

Patch was intended for exFAT which seems to not have SFN either. It works also for NTFS.
(I had file around with SFN missing on Windows Vista Business 32-bit SP3 and did not remove it to 
have something for testing on NTFS)

Andris