#include "stdio.h"
#include "errno.h"
#ifndef NULL
/* ANSI C */
#include "stddef.h"
#endif

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

#ifdef MSDOS
#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;
#ifndef MSDOS
  long uinode;
  int udev;
#endif
  int url;  /*0=sequential*/
  flag useek; /*true=can backspace, use dir, ...*/
  flag ufmt;
  flag uprnt;
  flag ublnk;
  flag uend;
  flag uwrt;  /*last io was write*/
  flag uscrtch;
} unit;

extern flag f__init;
extern cilist *f__elist;  /*active external io list*/
extern flag f__reading, f__external, f__sequential, f__formatted;
#undef Void
#ifdef KR_headers
#define Void /*void*/
extern int (*f__getn)(), (*f__putn)(); /*for formatted io*/
extern long f__inode();
extern VOID sig_die();
extern int (*f__donewrec)(), t_putc(), x_wSL();
extern int c_sfe(), err_fl(), xrd_SL();
#else
#define Void void
#if defined(__cplusplus) && !defined(BUILD_AS_CPP)
extern "C" {
#endif
  extern int (*f__getn)(void), (*f__putn)(int); /*for formatted io*/
  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);
#if defined(__cplusplus) && !defined(BUILD_AS_CPP)
}
#endif
#endif
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) {if(f) errno= m; else f__fatal(m,s); return(m);}
#define errfl(f,m,s) return err__fl(f,m,s)

/*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)
