Re: Is this correct?

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/