#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>

#define _IOC_NRBITS	8
#define _IOC_TYPEBITS	8
#define _IOC_SIZEBITS	14
#define _IOC_DIRBITS	2

#define _IOC_NRMASK	((1 << _IOC_NRBITS)-1)
#define _IOC_TYPEMASK	((1 << _IOC_TYPEBITS)-1)
#define _IOC_SIZEMASK	((1 << _IOC_SIZEBITS)-1)
#define _IOC_DIRMASK	((1 << _IOC_DIRBITS)-1)

#define _IOC_NRSHIFT	0
#define _IOC_TYPESHIFT	(_IOC_NRSHIFT+_IOC_NRBITS)
#define _IOC_SIZESHIFT	(_IOC_TYPESHIFT+_IOC_TYPEBITS)
#define _IOC_DIRSHIFT	(_IOC_SIZESHIFT+_IOC_SIZEBITS)

#define _IOC_NONE	0U
#define _IOC_WRITE	1U
#define _IOC_READ	2U

#define _IOC(dir,type,nr,size) \
	(((dir)  << _IOC_DIRSHIFT) | \
	 ((type) << _IOC_TYPESHIFT) | \
	 ((nr)   << _IOC_NRSHIFT) | \
	 ((size) << _IOC_SIZESHIFT))

extern unsigned int __invalid_size_argument_for_IOC;
#define _IOC_TYPECHECK(t) \
	((sizeof(t) == sizeof(t[1]) && \
	  sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
	  sizeof(t) : __invalid_size_argument_for_IOC)

#define _IO(type,nr)		_IOC(_IOC_NONE,(type),(nr),0)
#define _IOR(type,nr,size)	_IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
#define _IOW(type,nr,size)	_IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
#define _IOWR(type,nr,size)	_IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
#define _IOR_BAD(type,nr,size)	_IOC(_IOC_READ,(type),(nr),sizeof(size))
#define _IOW_BAD(type,nr,size)	_IOC(_IOC_WRITE,(type),(nr),sizeof(size))
#define _IOWR_BAD(type,nr,size)	_IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))

#define	VFAT_IOCTL_READDIR_BOTH32	_IOR('r', 1, struct compat_dirent[2])
#define	VFAT_IOCTL_READDIR_SHORT32	_IOR('r', 2, struct compat_dirent[2])
#define VFAT_IOCTL_READDIR_BOTH		_IOR('r', 1, struct dirent [2])
#define VFAT_IOCTL_READDIR_SHORT	_IOR('r', 2, struct dirent [2])

typedef unsigned short u16;
typedef signed int s32;
typedef unsigned int u32;
typedef long		__kernel_off_t;
typedef s32		compat_off_t;

struct compat_dirent {
	u32		d_ino;
	compat_off_t	d_off;
	u16		d_reclen;
	char		d_name[256];
};

struct dirent {
	long		d_ino;
	__kernel_off_t	d_off;
	unsigned short	d_reclen;
	char		d_name[256]; /* We must not include limits.h! */
};

#define O_DIRECTORY	00200000	/* must be a directory */

int main(int argc, char *argv[])
{
	struct compat_dirent cdire[2];
	struct dirent dire[2];
	int fd;

	printf("%zu : %lx, %lx\n",
	       sizeof(struct dirent),
	       (unsigned long) VFAT_IOCTL_READDIR_BOTH,
	       (unsigned long) VFAT_IOCTL_READDIR_SHORT);
	printf("%zu : %lx, %lx\n",
	       sizeof(struct compat_dirent),
	       (unsigned long) VFAT_IOCTL_READDIR_BOTH32,
	       (unsigned long) VFAT_IOCTL_READDIR_SHORT32);

	for (argv++; *argv; argv++) {
		fd = open(*argv, O_DIRECTORY | O_RDONLY);
		if (fd < 0) {
			perror(*argv);
			exit(1);
		}

		printf("Calling VFAT_IOCTL_READDIR_BOTH32\n");
		if (ioctl(fd, VFAT_IOCTL_READDIR_BOTH32, cdire) < 0)
			perror("ioctl");
		printf("Calling VFAT_IOCTL_READDIR_BOTH\n");
		if (ioctl(fd, VFAT_IOCTL_READDIR_BOTH, dire) < 0)
			perror("ioctl");
		close(fd);
	}

	return 0;
}