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Re: `concat' a dir and a file (was: Strange `file-name-sans-extension' b

From: Eli Zaretskii
Subject: Re: `concat' a dir and a file (was: Strange `file-name-sans-extension' behavior )
Date: Sun, 18 Aug 2002 22:25:17 +0300

> Date: Fri, 16 Aug 2002 22:51:10 -0600 (MDT)
> From: Richard Stallman <address@hidden>
> As far as I can see, if you don't insist on an absolute file name,
> it is correct to use concat.  As far as I can see, Eli's example
> is only an issue if you want an absolute file name:
> >     It means that to produce a full file name from a relative directory
> >     "c:" and a relative file name "bar", a function should yield
> >     "c:./bar".
> Eli, is c:bar an invalid file name on MSDOS?

"c:bar" is a valid file name on DOS and Windows file systems.  It
means `bar' in the default directory of the C: drive.  In other words,
it's the same as "c:./bar".

> So it seems that in the case where you are happy to have
> a non-absolute file name as the result, there is no problem.

There should be no problem if none of the functions involved convert
"c:" to "c:/".  I don't recall if that's so and don't have time to
check, but I wouldn't be surprised if Emacs primitives already take
care of this.

It's the case of application code doing (concat dir "/" file) is what
worries me.

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