GNU bug report logs - #75994
"seq -w" is broken for large enough numbers

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Package: coreutils; Severity: wishlist; Reported by: Alexey Dobriyan <adobriyan@HIDDEN>; dated Sat, 1 Feb 2025 17:45:01 UTC; Maintainer for coreutils is bug-coreutils@HIDDEN.
Severity set to 'wishlist' from 'normal' Request was from Paul Eggert <eggert@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: Re: bug#75994: "seq -w" is broken for large enough numbers
To: Alexey Dobriyan <adobriyan@HIDDEN>
References: <e0bf6e6c-aa37-46a3-8602-01b2282dd276@p183>
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On 2025-02-01 12:34, Alexey Dobriyan wrote:
> I'd do decimal fixed point.

Patches along those lines would be welcome, I expect.




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bug#75994; Package coreutils. Full text available.

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Date: Sat, 1 Feb 2025 23:34:31 +0300
From: Alexey Dobriyan <adobriyan@HIDDEN>
To: =?utf-8?Q?P=C3=A1draig?= Brady <P@HIDDEN>
Subject: Re: bug#75994: "seq -w" is broken for large enough numbers
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On Sat, Feb 01, 2025 at 08:01:18PM +0000, Pádraig Brady wrote:
> With -w seq will use long doubles internally,
> which usually have a 64 bit significand.
> I.e. once you go above 2^64, you get approximations of integers.
> 
> Now we could adjust seq to use the "ASCII" increment method
> in this case by handling leading zeros appropriately.
> It would be good to know your use case here though,
> as to know how common this issue might be.

The usecase is using GNU seq as reference implementation. :^)

I'd do decimal fixed point. Given that seq only does addition
it won't be that bad.




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Subject: Re: bug#75994: "seq -w" is broken for large enough numbers
To: Alexey Dobriyan <adobriyan@HIDDEN>, 75994 <at> debbugs.gnu.org
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On 01/02/2025 17:43, Alexey Dobriyan wrote:
> coreutils 9.3, 9.5
> 
> Steps to reproduce:
> 
> 	# 21 digits
> 	$ seq 111111111111111111111 1 111111111111111111113
> 	111111111111111111111
> 	111111111111111111112
> 	111111111111111111113

With no -w, seq doesn't use floating point
and instead operates on the ASCII values directly.

> 
> 	$ seq -w 111111111111111111111 1 111111111111111111113
> 	111111111111111111112	# what?
> 	111111111111111111112
> 	111111111111111111112
> 	111111111111111111112


With -w seq will use long doubles internally,
which usually have a 64 bit significand.
I.e. once you go above 2^64, you get approximations of integers.

Now we could adjust seq to use the "ASCII" increment method
in this case by handling leading zeros appropriately.
It would be good to know your use case here though,
as to know how common this issue might be.

cheers,
Pádraig




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Date: Sat, 1 Feb 2025 20:43:37 +0300
From: Alexey Dobriyan <adobriyan@HIDDEN>
To: bug-coreutils@HIDDEN
Subject: "seq -w" is broken for large enough numbers
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coreutils 9.3, 9.5

Steps to reproduce:

	# 21 digits
	$ seq 111111111111111111111 1 111111111111111111113
	111111111111111111111
	111111111111111111112
	111111111111111111113

	$ seq -w 111111111111111111111 1 111111111111111111113
	111111111111111111112	# what?
	111111111111111111112
	111111111111111111112
	111111111111111111112




Acknowledgement sent to Alexey Dobriyan <adobriyan@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-coreutils@HIDDEN. Full text available.
Report forwarded to bug-coreutils@HIDDEN:
bug#75994; Package coreutils. Full text available.
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