[sheepdog] [PATCH RFC] employ gnu99 style of GCC

[Hitoshi Mitake]

At Mon, 29 Apr 2013 21:43:05 +0800,
Liu Yuan wrote:
> > Dividing these switches into functoins and jump tables would be a
> > better way, but it cannnot be optimal always. Because the local
> > variables in original function should be passed as their
> > parameters. If there are many local variables, we have to implement
> > these functions which has many parameters, or declare them as global
> > variables.
> > 
> 
> I think it depends. Switch case is easier to write and concise enough to
> handle bundle of function return cases. We can even write helper
> functions for case handling if one is too big. But if we have more than
> 10 cases to handle and handling code is complex, it is always better to
> use jump table to get neater code.
> 
> Speaking of too many local variables, I'd like to see it as a warn of
> unstructured big functions which does poor abstraction and layering,
> which is hard to understand and patch as more dependencies and
> assumptions added as time go by. If we have to pass many variable
> between functions, then it is better to group them as a struct rather
> than plainly sharing them in a big function as local variables, this is
> very much like sharing too many global variables between source files.


Yes. I agree with your opinion. If there are too many local variables
and too many cases, packing these variables into one struct + jump
table would be an optimal way.

Interleaving statements and declarations is not a radical way for
improving readability and keeping code clean. We should consider
employing more radical ways e.g. jump tables for keeping code simple.

Thanks,
Hitoshi