GNU logs - #75994, boring messages

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Subject: bug#75994: "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

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To: Alexey Dobriyan <adobriyan@HIDDEN>
Subject: bug#75994: Acknowledgement ("seq -w" is broken for large enough
 numbers)
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Subject: bug#75994: "seq -w" is broken for large enough numbers
Resent-From: =?UTF-8?Q?P=C3=A1draig?= Brady <P@HIDDEN>
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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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Subject: bug#75994: "seq -w" is broken for large enough numbers
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Date: Sat, 1 Feb 2025 23:34:31 +0300
From: Alexey Dobriyan <adobriyan@HIDDEN>
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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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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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severity 76060 wishlist
severity 75994 wishlist
severity 75649 wishlist
severity 73510 wishlist
severity 73331 wishlist
severity 71307 wishlist
severity 73784 wishlist
tags 73194 notabug
close 74194
close 73194
close 73134
close 72756
severity 72024 wishlist
tags 71895 moreinfo unreproducible
tags 69636 notabug
close 69636
severity 69368 wishlist

Last modified: Sun, 16 Feb 2025 07:00:02 UTC

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