#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_alphasort)(const struct dirent**,const struct dirent**) = alphasort;

int(*p_closedir)(DIR*) = closedir;

int(*p_dirfd)(DIR*) = dirfd;

DIR*(*p_fdopendir)(int) = fdopendir;

DIR*(*p_opendir)(const char*) = opendir;

struct dirent*(*p_readdir)(DIR*) = readdir;

int(*p_readdir_r)(DIR*restrict,struct dirent*restrict,struct dirent**restrict) = readdir_r;

void(*p_rewinddir)(DIR*) = rewinddir;

int(*p_scandir)(const char*,struct dirent***,int(*)(const struct dirent*),int(*)(const struct dirent**,const struct dirent**)) = scandir;

#ifdef _XOPEN_SOURCE

void(*p_seekdir)(DIR*,long) = seekdir;

long(*p_telldir)(DIR*) = telldir;

#endif

}