Re: Is this correct?

Hi

BTW.  The same happens on LWW (as expected). But on Windows, SBCL behaves
just like LWW; I suppose because on Windows, LWW and SBCL agree on the
"case" of the underlying File System.

Having said that, if I may, we are not in a multiverse and a file is
created in a single step (more or less atomic).  Once that happens, it has
a truename (in the Earthsea sense).  Links come later.

I have not tried it on Linux or other Unixes.

Cheers

MA






On Fri, Feb 20, 2026 at 6:59 PM Marco Antoniotti <[email protected]>
wrote:

> The ANSI for EQUALP states that pathnames are always compared ar per
> EQUAL.  So LW is correct.
>
> Yes, I ended up using namestrings as keys, but I am chasing down a couple
> of other cases where the difference matters between LW (and ECL) and SBCL.
>
> I think it was Christopher Stacy who just said that the ANSI committee
> "punted" on pathnames.
>
> I regard this as a pinnacle of understatement. 🙄
>
> Cheers
>
> MA
>
> On Fri, Feb 20, 2026 at 6:51 PM Martin Simmons <[email protected]>
> wrote:
>
>> Actually, EQUALP does descend into pathnames, but LispWorks always uses
>> EQUAL
>> to compare the components on unix-like systems.  You can mount a
>> case-sensitive filesystem on macOS as well (e.g. nfs), so there could
>> potentially be different rules for different parts of the name.
>>
>> I suggest using the namestring as the key in an EQUALP hash table if you
>> don't
>> care about case.
>>
>> --
>> Martin Simmons
>> LispWorks Ltd
>> http://www.lispworks.com/
>>
>>
>>
>> >>>>> On Fri, 20 Feb 2026 18:11:35 +0100, Marco Antoniotti (as marco dot
>> antoniotti at unimib dot it) said:
>> >
>> > Hi
>> >
>> > Thanks Martin for your answer.
>> >
>> > Tim, the case is that in some cases I am loading an uppercased (or
>> > lowercased) name.  Things were all beautiful until I checked what SBCL
>> was
>> > doing.
>> >
>> > Other fun fact: things would still work in my use case (an EQUAL hash
>> table
>> > on pathnames) if EQUALP descended in the pathnames guts; alas, this is
>> not
>> > in ANSI.
>> >
>> > Cheers
>> >
>> > MA
>> >
>> >
>> > On Fri, Feb 20, 2026 at 6:04 PM Tim Bradshaw <[email protected]> wrote:
>> >
>> > > On 20 Feb 2026, at 17:02, Marco Antoniotti (as marco dot antoniotti at
>> > > unimib dot it) <[email protected]> wrote:
>> > > >
>> > > > My code runs on LWM but not on SBCL.  Or viceversa.
>> > >
>> > > Can you explain what the actual problem is: are you somehow depending
>> on
>> > > the case of the filename?
>> >
>> >
>> >
>> > --
>> > 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/
>> >
>>
>
>
> --
> 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/
>


-- 
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/