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From:	"Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Date:	Tue, 20 Dec 2016 17:26:09 +0300
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Subject:	Re: DJGPP problem with getting file size via fstat or not implemented yet?
To:	djgpp AT delorie DOT com
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On 12/20/16, RayeR (glaux AT centrum DOT cz) [via djgpp AT delorie DOT com]
<djgpp AT delorie DOT com> wrote:
> Hi, I compiled the Wavpack lossless codec tool and found a problem in
> function DoGetFileSize() that on unix systems use this code:
>
> struct stat statbuf;
>
>     if (!hFile || fstat (fileno (hFile), &statbuf) || !(statbuf.st_mode &
> S_IFREG))
>         return 0;
>
>     return (int64_t) statbuf.st_size;
>
> The problem is that it returns zero.

The problem is not with fstat(): break that if construct into smaller
pieces and check every step, and you shall see that it is the S_IFREG
check on st_mode which is failing. Djgpp defines S_IFREG as 0x0000, so
it is no miracle that it fails.  Replace !(statbuf.st_mode & S_IFREG)
with !S_ISREG(statbuf.st_mode) and it shall work.

>  So I used lfilelength(fileno(hFile)
> function that works. Does it mean that there's a bug in fstat or it is not
> implemented at all (just a dummy)? Does lfilelength() supports >2GB files on
> enabled filesystems (like NTFS under NTVDM)?

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