From: tr.17687@z991.linuxsc.com   
      
   Kaz Kylheku <643-408-1753@kylheku.com> writes:   
      
   > Jonas Lund of https://whizzter.woorlic.org/ mentioned this   
   > trick in a HackerNews comment:   
   >   
   > Given:   
   >   
   >   struct S {   
   >     // ...   
   >     T A[];   
   >   };   
   >   
   > Don't do this:   
   >   
   >   malloc(offsetof(S, A) + n * sizeof (T));   
   >   
   > But rather this:   
   >   
   >   malloc(offsetof(S, A[n]));   
   >   
   > It's easy to forget that the second argument of offsetof is a   
   > designator, not simply a member name.   
      
   Clever but inadvisable.  Even if the offsetof() expression compiles,   
   in most cases it either gives a value that is too small or is   
   undefined behavior.   
      
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