typedef int void;

#define	BUFSIZ	512
#define	_NFILE	20
#define FNMAX	100	/* max length of filename, for conversion routines */

# ifndef FILE
extern	struct	_iobuf {
	char	*_ptr;		/* current char */
	int	_cnt;		/* offset in file */
	char	*_base;		/* buffer start */
	int	_flag;		/* flags */
	int	_file;		/* jfn */
} _iob[_NFILE];

#define NJFN 96				/* max allowed by tops20 ??97 */

# ifndef _SOCKADDR_DEFINED
struct sockaddr {
	unsigned short sa_family; 	/* address family */
	char	sa_data[14];		/* up to 14 bytes of direct address */
};
# define _SOCKADDR_DEFINED 1
# endif

typedef struct _sockstr {
    int	_dev,				/* device code */
	_af,				/* address family (from socket(2)) */
	_type,				/* socket type (from socket(2)) */
	_proto;				/* protocol? (from socket(2)) */
    struct sockaddr _name;		/* address from bind(2)/connect(2) */
    int _namel,				/* length of address */
	_backlog;			/* backlog (from listen(2)) */
} _SOCKSTR;

/* _dev field */
# define  D_TCP 1
# define  D_UDP 2
# define  D_DCN 3

extern struct _fot {			/* indexed by jfn */
    int	_flg;	/* in this compiler, must be diff name from _iob._flag */
    int _tiw;				/* saved terminal intr word */
/*  int _unused2;			/* reserved */
    struct _sockstr *_sock;
}  _fotab [NJFN];

# endif

#define	FILE	struct _iobuf

#define	_IOREAD	01
#define	_IOWRT	02
#define	_IONBF	04
#define	_IOMYBUF 010
#define	_IOEOF	020
#define	_IOERR	040
#define	_IOSTRG	0100
#define _IOLBF  0200
#define	_IORW	0400

#define	_IOTTY	01000
#define _IOBINARY 02000

#define	NULL	0
#define	EOF	(-1)
#define EOS	'\0'	/* end of string */
#define OPENERR (-1)
#define TTYEOF	('\032')	/* ctrl-Z */

#define	stdin	(&_iob[0])
#define	stdout	(&_iob[1])
#define	stderr	(&_iob[2])

#define getc(p)		(--(p)->_cnt>=0? *(p)->_ptr++:_filbuf(p))
#define	getchar()	getc(stdin)
#define putc(x,p)     (--(p)->_cnt>=0?((int)(*(p)->_ptr++=(x))):_flsbuf((x),p))
#define	putchar(x)	putc(x,stdout)
#define	feof(p)		(((p)->_flag&_IOEOF)!=0)
#define	ferror(p)	(((p)->_flag&_IOERR)!=0)
#define	fileno(p)	((p)->_file)

FILE	*fopen();
FILE	*freopen();
FILE	*fdopen();
long	ftell();
char	*fgets();

#define atol(p)	atoi(p)

	/* Try keep same flags as in _iob */
#ifdef COMMENT		/* these are defined elsewhere; must leave room */
# define ECHO	010
# define CRMOD	020
# define RAW	040
#endif

#define _FOEOF		001
#define _FODIR		002		/* is a directory */
#define _FOTTY	      01000		/* is a tty, use texti to read */
#define _FOBINARY     02000

#define _FOSOCKET   0100000		/* BUDD is socket */
#define _FOBOUND    0200000		/* BUDD has been bind()'ed */
#define _FOCONN     0400000		/* BUDD has been connect()'ed */
#define _FORESVD   01000000		/* BUDD has been rresvport()'d */

#define ISSOCK(fd)	(_fotab[jfnof(fd)]._flg & _FOSOCKET)

#ifndef jfnof
# define jfnof(fd)	( (fd) <= 2 ? fileno(&_iob[fd]) : fd )
#endif

#define isatty(fd)	(_fotab[jfnof(fd)]._flg & _FOTTY)