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From: "bruno at clisp dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug locale/19418] iconv should stop reading from 'inbuf' when
 'outbytesleft' is zero
Date: Sat, 18 Feb 2023 23:09:49 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D19418

Bruno Haible <bruno at clisp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bruno at clisp dot org

--- Comment #3 from Bruno Haible <bruno at clisp dot org> ---
(In reply to Andreas Schwab from comment #2)
> It is impossible in general to know how much space is needed in *outbuf
> before reading the next bytes from *inbuf.

Right. In particular some bytes from the input may be dropped from the outp=
ut.
See:

$ printf 'x\U000E0004' | iconv -f UTF-8 -t UCS-2BE | od -t x1
0000000 00 78
0000002

It produces the same output as

$ printf 'x' | iconv -f UTF-8 -t UCS-2BE | od -t x1
0000000 00 78
0000002

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