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Date:	Sat, 7 Jul 2012 17:18:28 -0700 (PDT)
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Subject:	Re: Ispell (found the problem!)
From:	rugxulo AT gmail DOT com
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Hi,

On Saturday, July 7, 2012 1:54:05 AM UTC-5, Eli Zaretskii wrote:
> > From: "Stephen W. Bullington" <s DOT  DOT  AT nospam DOT key-net DOT net>
> > Date: Fri, 6 Jul 2012 18:00:36 -0400
> > 
> > When I try to use [Emacs] I get the message "Failed to
> > open temporary file:  no such 
> > file or directory (ENOENT), detmp.XXX".  I get the same message if I try 
> > to run a shell command.  I also have DJGPP Emacs installed on a Windows 
> > 98SE box, with LFN=Y, and Ispell works fine there.

Annoying. I really suck at using GDB, or I could've found this faster. Anyways ....

The problem is that src\callproc.c uses mkstemp(), hence callproc's "Failed to open temporary file" message, since mkstemp() calls mktemp() which requires a filename using "emXXXXXX" and fails on "emxxxxxx" (lower case 'x's).

Here's callproc.c's  culprit line (indirectly):

pattern = Fexpand_file_name (Vtemp_file_name_pattern, tmpdir);

See src\fileio.c for that definition, which basically uses this:

name = FILE_SYSTEM_CASE (name);

Which is defined in src\s\msdos.h as this:

#define FILE_SYSTEM_CASE Fmsdos_downcase_filename

Which is ultimately defined in src\msdos.c and basically says this:

"Under LFN we expect to get pathnames in their true case."

So there, problem solved! Now Dr. Watson ... er, Eli, can suggest a tiny patch or you can probably figure it out yourself.  :-)

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