Re: expand-file-name, DOS/Windows, and directory separator

[Eli Zaretskii]

> From: Eric Abrahamsen <eric@ericabrahamsen.net>
> Date: Tue, 15 Feb 2022 09:59:53 -0800
> 
> My reading of `expand-file-name' (I don't really speak C) is that, if we
> run it over a file path produced by an external process on a Windows
> machine -- meaning path strings where the directory separator might be a
> backward slash -- it will normalize that separator to a unix-style
> forward slash. It looks like fileio.c:1247 calls dostounix_filename, and
> I'm assuming that's what that does.
> 
> Is that a correct assumption?

Yes.

> Can I rely on that behavior?

I'd rather you didn't.  Why do you need such an assumption?  Emacs on
Windows can cope with file names that use any style of slashes.