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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. Rich Felker‏ @RichFelker Jul 17

      Optimization I'd like to see compilers be able to make: if (strlen(s)>100) -> if (strnlen(s,101)>100)

      6 replies 6 retweets 25 likes
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    2. Clifford Wolf‏ @oe1cxw Jul 17
      Replying to @RichFelker

      If "s" is between 1 and 100 bytes longer than the range of size_t, is this defined as true, or is strlen() itself undefined for this case? (I don't see this case explicitly covered in C99 std, but strlen returns size_t, not ssize_t, so I would assume overflow is well defined?)

      1 reply 0 retweets 0 likes
    3. Koorogi‏ @koorogi Jul 17
      Replying to @oe1cxw @RichFelker

      there's no way to create an object larger than the range of size_t in C, and how would you access all of it if there were? And some implementations (musl) only allow allocations in the range of ssize_t.

      1 reply 0 retweets 1 like
    4. Clifford Wolf‏ @oe1cxw Jul 18
      Replying to @koorogi @RichFelker

      I don't think size_t is required to be the same size as a pointer. You might not be able to create such a large string yourself on the heap, but that doesn't mean it can't already exist...

      3 replies 0 retweets 0 likes
    5. Koorogi‏ @koorogi Jul 18
      Replying to @oe1cxw @RichFelker

      they aren't. I think on DOS, a far pointer is 32 bits while size_t is 16. Sure, you can wrangle more than 64KB of consecutive memory together. But C still doesn't have a concept of such a large object, so I think calling the standard library functions on it are going to cause UB.

      1 reply 0 retweets 1 like
      Rich Felker‏ @RichFelker Jul 18
      Replying to @koorogi @oe1cxw

      In the large or huge model size_t should be 32-bit.

      5:29 AM - 18 Jul 2018
      • 1 Like
      • Clifford Wolf
      0 replies 0 retweets 1 like

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