GNU bug report logs - #79369
seq generates wrong sequences for big numbers

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Message #13 received at 79369-done <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: ondra007.tom <at> seznam.cz, 79369-done <at> debbugs.gnu.org
Subject: Re: bug#79369: seq generates wrong sequences for big numbers
Date: Tue, 2 Sep 2025 20:53:31 +0100

On 02/09/2025 16:52, Pádraig Brady wrote:
> On 02/09/2025 13:11, ondra007.tom <at> seznam.cz wrote:
>> It looks like seq for integers bigger than 2^64 sometimes generate wrong
>> results. There are few examples of wrong output I have found:
>>
>>
>> $ seq 18446744073709551617 inf | head -3
>>
>> 18446744073709551616
>> 18446744073709551617
>> 18446744073709551618
>>
>>
>>
>>
>>
>> $  seq 10000000000000000000000000000 inf | head -3
>>
>>
>> 9999999999999999999731564544
>> 9999999999999999999731564545
>> 9999999999999999999731564546
> 
> We can improve for the above 2 cases anyway,
> with something like the attached.
> 
> Large magnitude negative start values are still problematic.

Ok I pushed that with a test included:https://github.com/coreutils/coreutils/commit/701416709
Marking this as done.

thanks,
Padraig

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