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Message-ID: <585f65a8-a675-4a1e-a774-5dc4ff2337f8@systematicsw.ab.ca>
Date: Fri, 8 Aug 2025 16:19:20 -0600
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Subject: Re: getting the on-disk case for a path
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From: Brian Inglis via Cygwin <cygwin AT cygwin DOT com>
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On 2025-08-08 00:53, Thomas Wolff via Cygwin wrote:
> Am 08.08.2025 um 02:31 schrieb Jeremy Drake via Cygwin:
>> On a case-insensitive but case-preserving filesystem, is there a Cygwin
>> API to get the on-disk case for a given path?  It seems like `realpath`
>> ought to do it but running
>> $ touch case-test
>> $ realpath CASE-TEST
>> returns CASE-TEST.
> On the command line, you could use
> ls | grep -i
> 
>> Regardless, canonicalize_file_name or realpath may not
>> be what I want because it would dereference symlinks.
>>
>> Background: I'm trying to debug some test failures in Clang, due to a
>> warning that's supposed to be issued when you #include "foo.h" but the
>> file on disk that it opened is "Foo.h".

Looks like if you use wildcards, it should work correctly:

$ lsattr -dl .
.                            ---
$ l *_exit*
_Exit.2  _exit.3
$ l _exit.?
_Exit.2  _exit.3
$ l _exit.[23]
_Exit.2  _exit.3
$ l *EXIT-TEST*
exit-test
$ l *exit*
_Exit.2  _exit.3  EXIT  exit-test

also, you could just opendir(3)/readdir(3)/closedir(3) and strcasecmp(3).

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retrancher  but when there is no more to cut
                                 -- Antoine de Saint-Exupéry

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