Working with UTF-8 in the kernel [LWN.net]

Working with UTF-8 in the kernel

Posted Mar 29, 2019 6:35 UTC (Fri) by Cyberax (✭ supporter ✭, #52523)
In reply to: Working with UTF-8 in the kernel by khim
Parent article: Working with UTF-8 in the kernel

The overhead of cross-address access will probably make it impractical for userspace.

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Working with UTF-8 in the kernel

Posted Mar 29, 2019 8:26 UTC (Fri) by felix.s (guest, #104710) [Link] (2 responses)

It seems to work fine for vDSO, doesn't it?

Working with UTF-8 in the kernel

Posted Mar 29, 2019 8:28 UTC (Fri) by Cyberax (✭ supporter ✭, #52523) [Link] (1 responses)

That would work for basically static data. At this point a special file in /proc might work just as well.

Working with UTF-8 in the kernel

Posted Mar 29, 2019 9:31 UTC (Fri) by dezgeg (guest, #92243) [Link]

Having the data tables readable from /proc sounds unattractive due to this part from the article:

"The UTF-8 patches incorporate these rules by processing the provided files into a data structure in a C header file. A fair amount of space is then regained by removing the information for decomposing Hangul (Korean) code points into their base components, since this is a task that can be done algorithmically as well."

Exporting these non-standard tables to userspace would lock in this custom format implementation detail forever.