#include <sys/types.h>
#include <stdio.h>
#include <errno.h>
#ifndef NULL
/* ANSI C */
#include <stddef.h>
#endif
#ifdef STDC_HEADERS
#include <string.h>
#endif

#ifndef SEEK_SET
#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2
#endif

/* Only use fseeko/ftello if they are both there.  */

#if defined (HAVE_FSEEKO) && defined (HAVE_FTELLO)
#define FSEEK fseeko
#define FTELL ftello
#else
#define FSEEK fseek
#define FTELL ftell
#endif

#if defined (MSDOS) && !defined (GO32)
#ifndef NON_UNIX_STDIO
#define NON_UNIX_STDIO
#endif
#endif

#ifdef UIOLEN_int
typedef int uiolen;
#else
typedef long uiolen;
#endif

/*units*/
typedef struct
{
  FILE *ufd;			/*0=unconnected */
  char *ufnm;
#if !(defined (MSDOS) && !defined (GO32))
  long uinode;
  int udev;
#endif
  int url;			/*0=sequential */
  flag useek;			/*true=can backspace, use dir, ... */
  flag ufmt;
  flag urw;			/* (1 for can read) | (2 for can write) */
  flag ublnk;
  flag uend;
  flag uwrt;			/*last io was write */
  flag uscrtch;
}
unit;

extern int f__init;
extern cilist *f__elist;	/*active external io list */
extern flag f__reading, f__external, f__sequential, f__formatted;
extern int (*f__getn) (void);	/* for formatted input */
extern void (*f__putn) (int);	/* for formatted output */
extern void x_putc (int);
extern long f__inode (char *, int *);
extern void sig_die (char *, int);
extern void f__fatal (int, char *);
extern int t_runc (alist *);
extern int f__nowreading (unit *), f__nowwriting (unit *);
extern int fk_open (int, int, ftnint);
extern int en_fio (void);
extern void f_init (void);
extern int (*f__donewrec) (void), t_putc (int), x_wSL (void);
extern void b_char (char *, char *, ftnlen), g_char (char *, ftnlen, char *);
extern int c_sfe (cilist *), z_rnew (void);
extern int isatty (int);
extern int err__fl (int, int, char *);
extern int xrd_SL (void);
extern int f__putbuf (int);
extern int (*f__doend) (void);
extern FILE *f__cf;		/*current file */
extern unit *f__curunit;	/*current unit */
extern unit f__units[];
#define err(f,m,s) do {if(f) {f__init &= ~2; errno= m;} else f__fatal(m,s); return(m);} while(0)
#define errfl(f,m,s) do {return err__fl((int)f,m,s);} while(0)

/*Table sizes*/
#define MXUNIT 100

extern int f__recpos;		/*position in current record */
extern int f__cursor;		/* offset to move to */
extern int f__hiwater;		/* so TL doesn't confuse us */

#define WRITE	1
#define READ	2
#define SEQ	3
#define DIR	4
#define FMT	5
#define UNF	6
#define EXT	7
#define INT	8

#define buf_end(x) (x->_flag & _IONBF ? x->_ptr : x->_base + BUFSIZ)