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Date: Thu, 04 Mar 2010 00:55:21 +0200
From: Eli Zaretskii <eliz AT gnu DOT org>
Subject: Re: Bug in findfirst/findnext: mangles certain characters.
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> From: "Rod Pemberton" <do_not_have AT havenone DOT cmm>
> Date: Wed, 3 Mar 2010 16:02:51 -0500
> Bytes: 4067
>=20
> Apparently, "alt 0xxx" is an undocumented method to produce ISO8859=
-1 in
> Windows only.

I think it's codepage 1252, not ISO 8859-1.  But they are identical,
except for the range 128..159 decimal.

> ab=C2=A6=C3=8C.txt    Name in Windows (a,b,0xA6,0xCC,.txt)
> ab__.txt    LFN in Windows98SE DOS console
> AB__~1.txt  SFN in Windows98SE DOS console

Underscores is how Windows 9x translates characters it cannot express
in the DOS OEM charset (codepage 437, in your case, I think).

> The shorter name in Win98 *after* a reboot:
> ab=C2=A6=C3=8C.txt
>=20
> Still there in Windows!!!
>=20
> So, the ISO8859-1 character information *is* being preserved.  My g=
uess is
> it's probably in the LFN, just inaccessible from or converted when =
in a DOS
> or Windows DOS Console.

Yes, that's true.

> However, I thought ODI's ldir.exe does raw directory access (doesn'=
t
> use the LFN API but displays LFN's) and it displays *underscores*.

The translation happens when the characters are displayed, not when
the directory entry is accessed.

> I'll have to startup a disk editor to see if the character
> information is actually stored in the directory structure, and in
> what format.

On Windows 9x, I think you will find that directory entries include
the characters from the codepage which was specified when Windows was
installed.  Windows 9x supports only a single 8-bit encoding, usually
one of the 12XX codepages.