Re: what's the correct behavior of directory-namestring

Correctness or incorrectness is in the eye of the beholder :)

Problem is, "context" is not just Windows vs FreeBSD.  It is also SBCL vs
LW vs CCL etc etc.

Cheers

MA



On Thu, Jul 31, 2025 at 12:26 PM Michał Herda | Keepit <[email protected]>
wrote:

> It's not that neither is correct. It's worse - *both* are correct, and
> correctness depends on context in this case.
> ------------------------------
> *From:* Marco Antoniotti <[email protected]>
> *Sent:* Thursday, July 31, 2025 9:33 AM
> *To:* Michał Herda | Keepit <[email protected]>
> *Cc:* Jinsong Zhao <[email protected]>; [email protected] <
> [email protected]>
> *Subject:* Re: [Sbcl-help] what's the correct behavior of
> directory-namestring
>
> ... which means neither is correct :)
>
> Oh, the joys of pathname munging taking into account ITS and TOPS :)
>
> Cheers
>
> MA
>
>
> On Wed, Jul 30, 2025 at 10:20 AM Michał Herda | Keepit via Sbcl-help <
> [email protected]> wrote:
>
> Both are correct - the parsing of namestrings is different on Windows and
> Linux.
>
> Try (DESCRIBE #P"R:/Temp/abc/") on both Windows and Linux to see which
> pathname slots are populated, and how, on which OS.
> ------------------------------
> *From:* Jinsong Zhao <[email protected]>
> *Sent:* Wednesday, July 30, 2025 8:23 AM
> *To:* [email protected] <[email protected]>
> *Subject:* [Sbcl-help] what's the correct behavior of directory-namestring
>
> [Some people who received this message don't often get email from
> [email protected]. Learn why this is important at
> https://aka.ms/LearnAboutSenderIdentification ]
>
> Hi there,
>
> I am using SBCL on Windows. I also have SBCL install on Debian Linux and
> FreeBSD.
>
> I have to deal with some pathnames, for example:
> #P"R:/Temp/abc/"
>
> When passing the pathname to directory-namestring in SBCL 2.5.7 on
> Windows, I got:
>
> * (directory-namestring #P"R:/Temp/abc/")
> "/Temp/abc/"
>
> SBCL 2.2.9 on Debian and 2.5.6 on FreeBSD, booth give:
>
> * (directory-namestring #P"R:/Temp/abc/")
> "R:/Temp/abc/"
>
> Which is the correct behavior?
>
> Best,
> Jinsong
>
>
>
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> Marco Antoniotti, Professor, Director         tel. +39 - 02 64 48 79 01
> DISCo, University of Milan-Bicocca U14 2043   http://dcb.disco.unimib.it
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-- 
Marco Antoniotti, Professor, Director         tel. +39 - 02 64 48 79 01
DISCo, University of Milan-Bicocca U14 2043   http://dcb.disco.unimib.it
Viale Sarca 336
I-20126 Milan (MI) ITALY

REGAINS: https://regains.disco.unimib.it/

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