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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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    1. Jonas Termansen‏ @sortiecat 10 Sep 2017

      Is there any C warning for memcmp(a, b, sizeof(type)) if either *a and *b are not of the type (or if struct doesn't start with type, etc)?

      1 reply 0 retweets 0 likes
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    2. Jonas Termansen‏ @sortiecat 10 Sep 2017

      It's also OK if a or b is void* or such. Probably not if a char*, I probably want a warning on that. Some good heuristics are necessary.

      1 reply 0 retweets 0 likes
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    3. Jonas Termansen‏ @sortiecat 10 Sep 2017

      I recognize the pattern memcpy(a, b, sizeof(*b)), but if the type of a or b changes, the other also needs to change.

      1 reply 0 retweets 0 likes
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    4. Jonas Termansen‏ @sortiecat 10 Sep 2017

      memcpy(a, b, sizeof(type)) is sort of a more neutral statement that asserts this code expects that type. I want to validate on type change.

      2 replies 0 retweets 1 like
      Show this thread
    5. Jonas Termansen‏ @sortiecat 10 Sep 2017

      This kind of warning probably isn't for everyone and maybe shouldn't be in -Wall but I think the tradeoff is worth it for my software.

      1 reply 0 retweets 0 likes
      Show this thread
    6. Jonas Termansen‏ @sortiecat 10 Sep 2017

      #define check_type(a, t) ({ t* c = a; c; }) #define memcmp_type(a, b, t) (memcmp(check_type(a, t), check_type(b, t), sizeof(t)))

      3 replies 0 retweets 0 likes
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      Rich Felker‏ @RichFelker 10 Sep 2017
      Replying to @sortiecat

      Simpler: a==b || memcpy(...)

      7:28 AM - 10 Sep 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 10 Sep 2017
          Replying to @RichFelker @sortiecat

          Or memcpy(1?a:b,b,sizeof *a)

          1 reply 0 retweets 0 likes
        3. Jonas Termansen‏ @sortiecat 10 Sep 2017
          Replying to @RichFelker

          Good suggestions (I like the a==b case)! I'm concerned == has less strict checks than =. Not sure about ?: type checks.

          1 reply 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker 10 Sep 2017
          Replying to @sortiecat

          They're all constraint violations so a compiler that doesn't warn is non-conforming.

          1 reply 1 retweet 2 likes
        5. Jonas Termansen‏ @sortiecat 10 Sep 2017
          Replying to @RichFelker

          I can confirm they work, cool! a == b || memcmp(a, b, sizeof(*a)) even seems like normal reasonable code, the warning is surprising though.

          1 reply 0 retweets 0 likes
        6. Jonas Termansen‏ @sortiecat 10 Sep 2017
          Replying to @sortiecat @RichFelker

          int a = 0; int b = 0; if (&a == &b || memcmp(&a, &b, sizeof(a)) { // Looks a bit odd though but will optimize well.

          0 replies 0 retweets 0 likes
        7. End of conversation

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