Re: file-attributes returns negative integer for inode value

[Eli Zaretskii <eliz@gnu.org>]

> From: "Drew Adams" <drew.adams@oracle.com>
> Date: Sun, 2 Mar 2008 16:12:59 -0800
> Cc: emacs-pretest-bug@gnu.org
> 
> > > M-x (file-attributes "c:/drews-lisp-20/Screenshots") gives:
> > >  
> > > (t 1 5 5 (18378 24192) (18123 40338) (18123 40337) 0
> > >  "drwxrwxrwx" nil -3082 240391127)
> > >  
> > > The inode value here is -3082.
> > 
> > And what's the real ino?
> 
> Dunno. How do I tell that on Windows?

One way is to run "ls -i" on that file.  You will need ls.exe from the
GnuWin32 port of Coreutils.  Note that the w32 emulation of `stat' in
the Windows port of Emacs does not use the real inode value verbatim,
it mangles it with bit-shift and XOR operations.  This is because the
inode is a 48-bit value, while sys/stat.h on Windows says the inode is
a 16-bit field.

> But I doubt you need that info to discover the problem, anyway. I suspect it
> is a problem on Windows in the code that detects a too-large integer and
> returns a cons in its place.

The problem is a little bit different: obviously, a 16-bit value
cannot overflow ab EMACS_INT.  The problem is we don't keep the value
positive.  I will work on this soon.