# define	_BUFSIZE	512
# define	 BUFSIZ		512
# define	_NFILE		16

typedef struct _iobuf
	{
	char	*_ptr;
	int	_cnt;
	char	*_base;
	int	_flag;
	int	_fd;
	long	_offset;
	int	_pid;
	}
FILE;

extern FILE _iob [_NFILE];
extern _exit (), exit ();

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

# define	_READ	01
# define	_WRITE	02
# define	_UNBUF	04
# define	_BIGBUF	010
# define	_EOF	020
# define	_ERR	040
# define	_UNSEEK 0100	/* the _fd is not seekable */
# define	_PIPE	0200
# define	_TTY	0400	/* _fd corresponds to a tty */
# define	_ALLOC  01000	/* buffer obtained through alloc */

# define	NULL	0
# define	EOF	(-1)

# define	getc(p) (--(p)->_cnt >= 0 \
			? *(p)->_ptr++ & 0377 : _fillbuf (p))

# define	getchar() getc(stdin)

# define	putc(x,p) \
	{\
	if (--(p)->_cnt >= 0)\
		*(p)->_ptr++ = (x);\
	else\
		_flushbuf ((x & 0377), (p));\
	if ((x) == '\n' && (p)->_flag & (_TTY | _UNSEEK))\
		fflush (p);\
	}

# define	putchar(x)	putc(x,stdout)

# define	fflush(a)	(_flushbuf(EOF,(a)))

# define YES 1
# define NO  0

# define isalpha(a) (isupper(a) || islower(a))
# define isupper(a) ('A' <= (a) && (a) <= 'Z')
# define islower(a) ('a' <= (a) && (a) <= 'z')
# define isdigit(a) ('0' <= (a) && (a) <= '9')
# define isspace(a) ((a) == ' ' || (a) == '\t' || (a) == '\n')
# define toupper(a) (islower(a) ? ((a) + 'A' - 'a') : (a))
# define tolower(a) (isupper(a) ? ((a) + 'a' - 'A') : (a))

# define min(a,b) ((a) < (b) ? (a) : (b))
# define max(a,b) ((a) > (b) ? (a) : (b))

/*
 * pseudo storage classes
 */


# define AFAST	register
# define FAST	register
# define GLOBAL	extern
# define IMPORT	extern
# define INTERN	static
# define LOCAL	static

/*
 *  pseudo types
 */

typedef char TEXT, TINY;
typedef double DOUBLE;
typedef float FLOAT;
typedef int ARGINT, BOOL, VOID;
typedef long LONG;
typedef short BITS, COUNT;
typedef unsigned BYTES;
typedef unsigned char UTINY;
typedef unsigned long ULONG;
typedef unsigned short UCOUNT;

/*
 * system parameters
 */

# define STDIN	0
# define STDOUT	1
# define STDERR	2
# define YES		1
# define NO		0
# define NULL	0
# define FOREVER	for (;;)
# define BUFSIZE	512
# define READ	0
# define WRITE	1
# define UPDATE	2
# define EOF		-1
# define BYTMASK	0377

/*
 *	macros
 */

# define abs(x)		((x) < 0 ? (-(x)) : (x))
# define iswhite(c)	((c) <= ' ' || 0177 <= (c)) /* ASCII ONLY */
# define isblack(a)	(!iswhite(a))
# define max(x, y)	(((x) < (y)) ? (y) : (x))
# define min(x, y)	(((x) < (y)) ? (x) : (y))


# define feof(a) ((a)->_flag & (_EOF | _ERR))
# define ferror(a) ((a)->_flag & _ERR)
# define fileno(a) ((a)->_fd)
# define clearerr(a) ((a)->_flag &= ~_ERR)
# define cleareof(a) ((a)->_flag &= ~_EOF)