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Date: Wed, 26 Jan 2011 17:15:56 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Bug in libiconv?
Message-ID: <20110126161556.GP28470@calimero.vinschen.de>
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On Jan 26 08:43, Charles Wilson wrote:
> On 1/26/2011 8:26 AM, Corinna Vinschen wrote:
> > On Jan 26 13:15, simrw AT sim-basis DOT de wrote:
> >>> Here's what happens on Cygwin:
> >>>   - Even though the last parameter to iconv is defined in bytes, the
> >>>     value of outbytesleft after the conversion is the number of remaining
> >>>     wchar"t's, not the number of remaining bytes.  That's contrary to
> >>> what POSIX defines, see
> >>> http://pubs.opengroup.org/onlinepubs/9699919799/functions/iconv.html
> >>
> >> IMHO, the count is correct.
> >> On Windows/Cygwin, wchar_t is 2 bytes, on Linux, 4 bytes.
> >> So the buffer is 512 bytes.
> >> In the first 3 cases, 10 input bytes were consumed so that there remains
> >> in the buffer (512 - 20) = 492 bytes.
> >> In the last case all 16 bytes are consumed so there remains in
> >> the buffer (512 - 32) = 480 bytes.
> > 
> > Yes, you're right.  Quite obviously I misinterpreted the results without
> > realizing that the buffer is smaller under Cygwin.
> 
> Sure, but there ARE still bugs in libiconv on Cygwin -- specifically:
>  - Even though iconv_open has been opened explicitely with "UTF-8" as
>    input string, the conversion still depends on the current application
>    codeset.  That doesn't make sense.
> and
>  - 'iconv_close ((iconv_t) -1);' crashes the application with a SEGV.

Indeed.  But it was an important hint, nevertheless.  It just didn't
occur to me that the buffer size is different between Cygwin and
Linux.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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