bug#70036: 30.0.50; Move file-truename to the C level

[Theodor Thornhill via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Po Lu <luangruo@yahoo.com> writes:

> Po Lu <luangruo@yahoo.com> writes:
>
>> Haiku supports realpath, but not wordexp.  We must reimplement virtually
>> all POSIX functions of this nature on Windows, as the versions provided
>> by system C libraries, if they exist at all, are inadequate for some
>> reason or another.  Furthermore, these functions are absent from a
>> number of other operating systems, such as OpenBSD and Android 14.0, and
>> on others (Alpine, I believe) wordexp is severely inefficient for being
>> implemented as a wrapper around /bin/sh.
>
> BTW, after reading the subject of this bug report, I don't believe there
> is a place for wordexp at all.  wordexp is no replacement for
> Fexpand_file_name, but rather a means of expanding input in the manner
> of a shell, which input might include arithmetic expressions, shell
> command substitutions, and other expressions valid as shell input.  If
> Fexpand_file_name alone will not suffice, TRT is to replicate the
> mechanics of file-truename in whole, not cutting corners with these
> admittedly tempting functions.

I agree, and believe you are right. I think Fexpand_file_name should be
enough. I'll look into it!

Thanks!