[MinGW-Notify] [mingw] #38225: Emulate _fseeki64()/_ftelli64() API on legacy platforms.

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Mon Nov 26 03:15:08 JST 2018


#38225: Emulate _fseeki64()/_ftelli64() API on legacy platforms.

  Open Date: 2018-04-21 14:26
Last Update: 2018-11-25 18:15

URL for this Ticket:
    https://osdn.net//projects/mingw/ticket/38225
RSS feed for this Ticket:
    https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=38225

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Last Changes/Comment on this Ticket:
2018-11-25 18:15 Updated by: keith

Comment:

I committed 09fb4c4, which should suffice to provide robust implementations of
_fseeki64() and _ftelli64() for all WinNT derived platforms. They will also
work on Win9x, but I'm leaving the ticket open for the time being, because, as
I suspected, they will interact badly with fwrite() on these platforms, if the
fwrite() is preceded by an _fseeki64() to an offset beyond the physical end of
file.



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Ticket Status:

      Reporter: keith
         Owner: (None)
          Type: Feature Request
        Status: Open
      Priority: 5 - Medium
     MileStone: (None)
     Component: WSL
      Severity: 5 - Medium
    Resolution: None
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Ticket details:

Although 32-bit Windows has supported operations on files larger than 2GB,
since at least WinNT4 and Win98, (and possibly earlier), Microsoft did not
introduce the _fseeki64() and _ftelli64() APIs until MSVCR80.DLL, (and
subsequently retrofitted it to MSVCRT.DLL, from WinVista onwards); prior to
this, random access support in large files was provided through lower level
APIs such as _lseeki64(), or native Windows API functions.

As noted in this mailing list query, and this subsequent follow-up thread, it
is practicable to emulate the _fseeki64() and _ftelli64() APIs, such that they
become available on legacy versions of Windows, which pre-date the formal
introduction of these APIs by Microsoft; however, previous efforts to do so may
not have been entirely robust. Hopefully, the attached patch will do a better
job.



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URL for this Ticket:
    https://osdn.net//projects/mingw/ticket/38225
RSS feed for this Ticket:
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