Paul Eggert <eggert@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Paul Eggert <eggert@HIDDEN>
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Subject: Re: bug#69636: Re: [PATCH] Improve quality of format-checking code
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From: Paul Eggert <eggert@HIDDEN>
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On 2024-03-08 05:47, P=C3=A1draig Brady wrote:
> =C2=A0 seq $a | xargs printf -- 'x%.0s'
>=20
> =C2=A0 printf "%${a}s" '' | tr ' ' x
>=20
> =C2=A0 yes x | head -n$a | tr -d '\n'
Oh, I like those! Unfortunately the printf solution silently fails for=20
me when a=3D10000000000 due to a bug in Bash. Perhaps I'll get up the=20
energy to propose a fix (at least it should *noisily* fail :-).
bug-coreutils@HIDDEN:bug#69636; Package coreutils.
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tag 69636 notabug
close 69636
stop
On 08/03/2024 12:29, User wrote:
>
> Jim Meyering <jim@HIDDEN> wrote:
>
>> Paul Eggert <eggert@HIDDEN> wrote:
>>> * src/seq.c (validate_format): Remove. Migrate its checks into...
>>> (long_double_format): Report an error and exit if an error is found,
>>> instead of returning NULL. All callers changed.
>>> Use a more-consistent format for diagnostics.
>>> * tests/misc/seq: Adjust to the more-consistent format for diagnostics.
>>> ---
>>> src/seq.c | 71
>> +++++++++++++++----------------------------------------
>>> tests/misc/seq | 10 ++++----
>>> 2 files changed, 25 insertions(+), 56 deletions(-)
>>
>> Thanks.
>> As far as I can see this is a "no semantic change"
>> patch (modulo diagnostics), and it looks fine, so I pushed it.
>
> Dear Paul Eggert and Jim Meyering,
>
>
> Thank you very much for the contribution and care! I hope you have
> awesome and cozy day!
>
> It is a nice addition to check the format in the most and explicitly
> safe cases, I believe, however it disallows to use it in cases when you
> need to just repeat a character without ANY processing directive! For
> example, `a=10; seq -f 'x' -s '' -- "$a";` would print 10 characters "x"
> without the check added prior and significantly (or little but still)
> support development in long codes which would require explicit loops or
> additional dependencies like awesome Perl.
>
> Is it possible to reconsider the check or add an option to ignore the
> format which does not have a required directive? If you know a better
> alternative to the standard utility which would result in the same small
> code but great result, please suggest if possible!
>
> Again, appreciated, and please stay safe!
This suggestion has some merit,
but there are a few ways to generate repetitive data already:
a=10
seq $a | xargs printf -- 'x%.0s'
printf "%${a}s" '' | tr ' ' x
yes x | head -n$a | tr -d '\n'
Also if only outputting to a terminal, then you can get the
repetition to happen within the terminal code like:
printf -- "x\e[${a}b"
Therefore I'm not sure it's worth relaxing the validation in seq.
thanks,
Pádraig
bug-coreutils@HIDDEN:bug#69636; Package coreutils.
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[194.135.95.142]) by smtp.gmail.com with ESMTPSA id x8-20020ac24888000000b0051339f52ab2sm2789593lfc.44.2024.03.08.04.29.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 08 Mar 2024 04:29:47 -0800 (PST) Message-ID: <0e68f0b4-c48a-4d82-a407-b87b20570c49@HIDDEN> Date: Fri, 8 Mar 2024 14:29:45 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: eggert@HIDDEN From: User <the.f8er@HIDDEN> Subject: Re: Re: [PATCH] Improve quality of format-checking code for seq. Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::129; envelope-from=the.f8er@HIDDEN; helo=mail-lf1-x129.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -1.3 (-) X-Debbugs-Envelope-To: submit Cc: bug-coreutils@HIDDEN X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Reply-To: 877i7vyf3l.fsf@HIDDEN Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -2.3 (--) Jim Meyering <jim@HIDDEN> wrote: > Paul Eggert <eggert@HIDDEN> wrote: > > * src/seq.c (validate_format): Remove. Migrate its checks into... > > (long_double_format): Report an error and exit if an error is found, > > instead of returning NULL. All callers changed. > > Use a more-consistent format for diagnostics. > > * tests/misc/seq: Adjust to the more-consistent format for diagnostics. > > --- > > src/seq.c | 71 > +++++++++++++++---------------------------------------- > > tests/misc/seq | 10 ++++---- > > 2 files changed, 25 insertions(+), 56 deletions(-) > > Thanks. > As far as I can see this is a "no semantic change" > patch (modulo diagnostics), and it looks fine, so I pushed it. Dear Paul Eggert and Jim Meyering, Thank you very much for the contribution and care! I hope you have awesome and cozy day! It is a nice addition to check the format in the most and explicitly safe cases, I believe, however it disallows to use it in cases when you need to just repeat a character without ANY processing directive! For example, `a=10; seq -f 'x' -s '' -- "$a";` would print 10 characters "x" without the check added prior and significantly (or little but still) support development in long codes which would require explicit loops or additional dependencies like awesome Perl. Is it possible to reconsider the check or add an option to ignore the format which does not have a required directive? If you know a better alternative to the standard utility which would result in the same small code but great result, please suggest if possible! Again, appreciated, and please stay safe! Best and kind regards, Artfaith
877i7vyf3l.fsf@HIDDEN:bug-coreutils@HIDDEN.
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