How do I make emacs indent treat #ifdef and #endif as if they were { and }?

[Jules Colding <colding@venalicium.dk>]

Hi,

I've tried to figure out how to make emacs indent #ifdef blocks just like it would curly brace blocks. With a twist though… I'd prefer if I could convince emacs to indent include statement half the amount of whitespace that normal code would be indented. 

My preference is to indent code with 8 spaces (or one tab of that size) and then use 4 spaces for include statements. Within code my preference would be if "#ifdef" was treated exactly as a "{" and "#endif" like a "}", indentation wise.

Like this:

#include <ifaddrs.h>
#ifdef __linux__
    #include <sys/socket.h>
#endif

int 
func(void)
{
        int foo = 0;

        #ifdef DO_STUFF
                foo = do_stuff();
        #endif

        return foo;
}


instead of the current affair:


#include <ifaddrs.h>
#ifdef __linux__
#include <sys/socket.h>
#endif

int 
func(void)
{
        int foo = 0;

#ifdef DO_STUFF
        foo = do_stuff();
#endif

        return foo;
}

Messing around with the indentation functions in emacs seems like a black art. Likely because I don't do lisp well... 

Would anyone have code that solves this or pointers to something that is close to what I want?

Thanks a lot,
  jules