naive GDB programming style questions

[David Carlton <carlton@math.stanford.edu>]

1) It seems to me that some parts of GDB's source use NULL while other
   parts use 0.  Is one or the other of these generally preferred?

2) Am I correct in observing that GDB frowns on code like the
   following:

     char *p = calculate_p ();

     if (!p)
       p_is_zero ();

   preferring this instead?

     char *p = calculate_p ();

     if (p == NULL)
       p_is_zero ();

   Does it matter that p in a pointer rather than an integer, or that
   the code is testing for zeroness rather than nonzeroness?

3) Is it possible to get CC Mode to indent in the way that GDB seems
   to prefer?  I'm having a hard time getting structs to be indented
   as follows:

     struct foo
       {
         int mem;
       };

   without screwing up my preferred indentation when doing non-GDB
   programming, namely

     struct foo {
       int mem;
     };

   Of course, I can write functions to toggle between the two; but
   given that both styles seem to be able to coexist for enums, maybe
   it's possible to get them to coexist for enums.  (I'm certainly no
   CC Mode expert...)

David Carlton
carlton@math.stanford.edu