/**
*
* This header file defines the information used by the standard I/O
* package.
*
**/
#define _BUFSIZ 512		/* standard buffer size */
#define BUFSIZ 512		/* standard buffer size */
#define _NFILE 20		/* maximum number of files */

struct _iobuf
{
char *_ptr;			/* current buffer pointer */
int _rcnt;			/* current byte count for reading */
int _wcnt;			/* current byte count for writing */
char *_base;		 	/* base address of I/O buffer */
char _flag;			/* control flags */
char _file;			/* file number */
int _size;			/* size of buffer */
char _cbuff;			/* single char buffer */
char _pad;			/* (pad to even number of bytes) */
};

extern struct _iobuf _iob[_NFILE];

#define _IOREAD 1		/* read flag */
#define _IOWRT 2		/* write flag */
#define _IONBF 4		/* non-buffered flag */
#define _IOMYBUF 8		/* private buffer flag */
#define _IOEOF 16		/* end-of-file flag */
#define _IOERR 32		/* error flag */
#define _IOSTRG 64
#define _IORW 128		/* read-write (update) flag */

#define NULL 0			/* null pointer value */
#define FILE struct _iobuf	/* shorthand */
#define EOF (-1)		/* end-of-file code */

#define stdin (&_iob[0])	/* standard input file pointer */
#define stdout (&_iob[1])	/* standard output file pointer */
#define stderr (&_iob[2])	/* standard error file pointer */

#define getc(p) (--(p)->_rcnt>=0? *(p)->_ptr++:_filbf(p))
#define getchar() getc(stdin)
#define putc(c,p) (--(p)->_wcnt>=0? ((int)(*(p)->_ptr++=(c))):_flsbf((c),p))
#define putchar(c) putc(c,stdout)
#define feof(p) (((p)->_flag&_IOEOF)!=0)
#define ferror(p) (((p)->_flag&_IOERR)!=0)
#define fileno(p) (p)->_file
#define rewind(fp) fseek(fp,0L,0)
#define fflush(fp) _flsbf(-1,fp)

FILE *fopen();
FILE *freopen();
long ftell();
Šchar *fgets();

#define abs(x) ((x)<0?-(x):(x))
#define max(a,b) ((a)>(b)?(a):(b))
#define min(a,b) ((a)<=(b)?(a):(b))