#include <dirent.h>

#define T(t) (t*)0;

#define F(t,n) {t *y = &x.;;}

#define C(n) switch(n){case n:;}

static void f()

{

T(DIR)

T(struct dirent)

#ifdef _XOPEN_SOURCE

T(ino_t)

#endif

{

struct dirent x;

#ifdef _XOPEN_SOURCE

F(ino_t,  d_ino)

#endif

F(char,   d_name[0])

}

{int(*p)(const struct dirent**,const struct dirent**) = alphasort;}

{int(*p)(DIR*) = closedir;}

{int(*p)(DIR*) = dirfd;}

{DIR*(*p)(int) = fdopendir;}

{DIR*(*p)(const char*) = opendir;}

{struct dirent*(*p)(DIR*) = readdir;}

{int(*p)(DIR*restrict,struct dirent*restrict,struct dirent**restrict) = readdir_r;}

{void(*p)(DIR*) = rewinddir;}

{int(*p)(const char*,struct dirent***,int(*)(const struct dirent*),int(*)(const struct dirent**,const struct dirent**)) = scandir;}

#ifdef _XOPEN_SOURCE

{void(*p)(DIR*,long) = seekdir;}

{long(*p)(DIR*) = telldir;}

#endif

}