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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    Rich Felker‏ @RichFelker 12 Sep 2017

    Apparently the extent of UTF-8's amazingness still isn't widely know. Today on #musl some1 asked to confirm mb chars never have ASCII bytes.

    7:35 PM - 12 Sep 2017
    • 9 Retweets
    • 25 Likes
    • Erik Strottmann Sergey Lozhkin iKyle Jon Colverson hov Pitiphong P. Vinicius Vendramini Paul Préfontaine Mårten 🗡
    1 reply 9 retweets 25 likes
      1. New conversation
      2. Rich Felker‏ @RichFelker 12 Sep 2017

        Not only do ASCII bytes never appear in multibyte UTF-8 chars; NO character is ever a substring of another character.

        1 reply 2 retweets 9 likes
        Show this thread
      3. Rich Felker‏ @RichFelker 12 Sep 2017

        UTF-8 was really a work of brilliance, guaranteeing what's pretty much a maximal set of important desirable properties like this.

        2 replies 3 retweets 15 likes
        Show this thread
      4. Rich Felker‏ @RichFelker 12 Sep 2017

        Of course the desirable properties necessitate one property that's hard to like: not all byte sequences can be legal/valid.

        2 replies 0 retweets 2 likes
        Show this thread
      5. Rich Felker‏ @RichFelker 12 Sep 2017

        But understanding the design goals/motivations makes it pretty obvious that this was the only reasonable tradeoff.

        1 reply 0 retweets 2 likes
        Show this thread
      6. Rich Felker‏ @RichFelker 12 Sep 2017

        @rob_pike's UTF-8 history (https://www.cl.cam.ac.uk/~mgk25/ucs/utf-8-history.txt …) sheds a lot of light on the desirable props, but some didn't become obvious til later.

        1 reply 2 retweets 11 likes
        Show this thread
      7. Rich Felker‏ @RichFelker 12 Sep 2017

        Just about the only thing that arguably could have been done better in UTF-8 would have been offsetting the base value for multibyte chars..

        2 replies 0 retweets 2 likes
        Show this thread
      8. Rich Felker‏ @RichFelker 12 Sep 2017

        So that, for example, c0 80 would represent 0x80+[decoded_bits] = 0x80 rather than being an illegal sequence.

        1 reply 0 retweets 2 likes
        Show this thread
      9. Rich Felker‏ @RichFelker 12 Sep 2017

        This would have allowed shorter encoding of a few chars and eliminated the confusion about "overlong sequences" & their invalidity.

        2 replies 0 retweets 3 likes
        Show this thread
      10. End of conversation

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