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Re: [patch #7132] Small change to grep-2.6

From: Jim Meyering
Subject: Re: [patch #7132] Small change to grep-2.6
Date: Thu, 25 Mar 2010 10:17:21 +0100

Norihiro Tanaka wrote:
> This problem is easily reproduced with both -w option and backref.

Hi Norihiro,

Thank you for the example.

To illustrate the problem on the command line, I did this:

    $ printf '%s\n' baa aax aa 'aa rest' zz | src/grep -Ew '(a)\1'; echo

Note how it prints only the matching text, but neither
the newline of line 3 nor the " rest\n" of line 4.

Does one of your patches fix that problem?
None of Paolo's 3-patch series appears to do so.

> #!/bin/sh
> # This would fail for grep-2.6
> : ${srcdir=.}
> . "$srcdir/init.sh"; path_prepend_ ../src
> printf 'foo foo bar\n'      > exp1 || framework_failure
> fail=0

BTW, while the framework_failure function is used to handle unlikely
failures in several other test scripts, I've just noticed
that it is not defined.  I will fix that shortly.

> for LOC in en_US.UTF-8 zh_CN $LOCALE_FR_UTF8; do
>   out=out1-$LOC
>   LC_ALL=$LOC grep -w '\(foo\) \1' exp1 > $out || fail=1
>   compare $out exp1 || fail=1
> done
> Exit $fail
> --

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