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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. John Regehr‏ @johnregehr Jun 10

      when u can't remember which header file declares mallocpic.twitter.com/DAm3LkyeZs

      21 replies 40 retweets 193 likes
      Show this thread
    2. John Regehr‏ @johnregehr Jun 10

      alternate formulationpic.twitter.com/SD6FOMCBvi

      14 replies 3 retweets 28 likes
      Show this thread
      Rich Felker‏ @RichFelker Jun 11
      Replying to @johnregehr

      Assuming that's complete, it's UB even in C89 because strlen is undeclared and the implicit return type (and likewise argument to malloc) is wrong.

      8:19 AM - 11 Jun 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. William D. Jones‏ @cr1901 Jun 11
          Replying to @RichFelker @johnregehr

          Assume the declaration was "char * malloc(size_t);". Would a use of malloc() be defined behavior b/c char * is compatible w/ void * (since they have to be the same size)?

          2 replies 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker Jun 11
          Replying to @cr1901 @johnregehr

          Yes that's also UB. It's not compatible.

          1 reply 0 retweets 0 likes
        4. William D. Jones‏ @cr1901 Jun 11
          Replying to @RichFelker

          (Asking sincerely, not accusatory) Which part of the standard says that void * and char * are not compatible? They have to be the same size; is there anything that says they don't have to have the same bit pattern repr?

          1 reply 0 retweets 0 likes
        5. Rich Felker‏ @RichFelker Jun 11
          Replying to @cr1901

          You're asking for the opposite of what you want. Unless something says they are then they're not. Size & representation are irrelevant.

          1 reply 0 retweets 0 likes
        6. William D. Jones‏ @cr1901 Jun 11
          Replying to @RichFelker

          Thankfully it's not like I wrote code like this. AFAICT, (implicit) casting from void * to char * and vice-versa means I can use a char * in place of a void * everywhere except: 1. Dereferencing a void * 2. Redeclaring an existing function that takes/returns void * w/ a char*?

          0 replies 0 retweets 0 likes
        7. End of conversation

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