typedef	struct __sFILE {
	unsigned char *_p;	/* (*) current position in (some) buffer */
	int	_r;		/* (*) read space left for getc() */
	int	_w;		/* (*) write space left for putc() */
	short	_flags;		/* (*) flags, below; this FILE is free if 0 */
	short	_file;		/* (*) fileno, if Unix descriptor, else -1 */
	struct	__sbuf _bf;	/* (*) the buffer (at least 1 byte, if !NULL) */
	int	_lbfsize;	/* (*) 0 or -_bf._size, for inline putc */

	/* operations */
	void	*_cookie;	/* (*) cookie passed to io functions */
	int	(*_close)(void *);
	int	(*_read)(void *, char *, int);
	fpos_t	(*_seek)(void *, fpos_t, int);
	int	(*_write)(void *, const char *, int);

	/* separate buffer for long sequences of ungetc() */
	struct	__sbuf _ub;	/* ungetc buffer */
	unsigned char	*_up;	/* saved _p when _p is doing ungetc data */
	int	_ur;		/* saved _r when _r is counting ungetc data */

	/* tricks to meet minimum requirements even when malloc() fails */
	unsigned char _ubuf[3];	/* guarantee an ungetc() buffer */
	unsigned char _nbuf[1];	/* guarantee a getc() buffer */

	/* separate buffer for fgetln() when line crosses buffer boundary */
	struct	__sbuf _lb;	/* buffer for fgetln() */

	/* Unix stdio files get aligned to block boundaries on fseek() */
	int	_blksize;	/* stat.st_blksize (may be != _bf._size) */
	fpos_t	_offset;	/* current lseek offset */

	struct pthread_mutex *_fl_mutex;	/* used for MT-safety */
	struct pthread *_fl_owner;	/* current owner */
	int	_fl_count;	/* recursive lock count */
	int	_orientation;	/* orientation for fwide() */
	__mbstate_t _mbstate;	/* multibyte conversion state */
} FILE;