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Re: [sed] bug when matching null bytes

From: Paul Eggert
Subject: Re: [sed] bug when matching null bytes
Date: Mon, 21 Aug 2006 10:06:50 -0700
User-agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.4 (gnu/linux)

Paolo Bonzini <address@hidden> writes:

> Bert Bos wrote:
>> Hello,
>> I think I found a bug in GNU sed: The "." regular expression doesn't
>> match null bytes.
> This is mandated by POSIX.

No, POSIX says that the input to sed must be a text file, and that
null bytes are not allowed in text files.  So if the input contains a
null byte, GNU 'sed' can do whatever it likes.  It will still conform
to POSIX even if "." matches a NUL byte.

In both GNU grep and GNU Emacs, "." matches a NUL byte, and there is a
strong argument that GNU "sed" should be consistent with other GNU
tools in this area.


INPUT FILES says "The input files shall be text files."
says that in a text file "The lines do not contain NUL characters".

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