This case is really difficult to catch without a full parser because of the switch() statement:

switch(test)
{
  case 1:
    do_something();
  (...)
}

In this case, you want indentation. In general the style for labels is to put them in the first level, so the whole things would look like that and that should be fine:

void
helloworld (int english, int japanese)
{
    if (english)
    {
        printf ("Hello World!");
    }

nippon_go:
    if (japanese)
    {
        printf ("Kon'nichiwa Sekai!");
    }
}

What if it's like this:

Check if label is a case in a switch (have "case" before it).
Make labels indent like preprocessor directives (always in first level).

Is it possible?

Sure it's possible but the indentation code is not entirely easy and it is kind of hard to add more special cases. Also consider the "labels" inside classes (public:, private:, protected:) that would need another special case.

Patches of course welcome ;)

I only wanted to add that even inside switch blocks, if's and other blocks have wrong indentation.

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