#ifndef _STDIO_IMPL_H
#define _STDIO_IMPL_H

#include <stdio.h>
#include "syscall.h"
#include "libc.h"

#define UNGET 8

#define FFINALLOCK(f) ((f)->lock >= 0 ? __lockfile((f)) : 0)
#define FLOCK(f) int __need_unlock = ((f)->lock >= 0 ? __lockfile((f)) : 0)
#define FUNLOCK(f)     \
  if (__need_unlock)   \
    __unlockfile((f)); \
  else

#define F_PERM 1
#define F_NORD 4
#define F_NOWR 8
#define F_EOF 16
#define F_ERR 32
#define F_SVB 64
#define F_APP 128

struct _IO_FILE {
  unsigned flags;
  unsigned char *rpos, *rend;
  int (*close)(FILE*);
  unsigned char *wend, *wpos;
  unsigned char* mustbezero_1;
  unsigned char* wbase;
  size_t (*read)(FILE*, unsigned char*, size_t);
  size_t (*write)(FILE*, const unsigned char*, size_t);
  off_t (*seek)(FILE*, off_t, int);
  unsigned char* buf;
  size_t buf_size;
  FILE *prev, *next;
  int fd;
  int pipe_pid;
  long lockcount;
  short dummy3;
  signed char mode;
  signed char lbf;
  volatile int lock;
  volatile int waiters;
  void* cookie;
  off_t off;
  char* getln_buf;
  void* mustbezero_2;
  unsigned char* shend;
  off_t shlim, shcnt;
  FILE *prev_locked, *next_locked;
  struct __locale_struct* locale;
};

size_t __stdio_read(FILE*, unsigned char*, size_t);
size_t __stdio_write(FILE*, const unsigned char*, size_t);
size_t __stdout_write(FILE*, const unsigned char*, size_t);
off_t __stdio_seek(FILE*, off_t, int);
int __stdio_close(FILE*);

size_t __string_read(FILE*, unsigned char*, size_t);

int __toread(FILE*);
int __towrite(FILE*);

#if defined(__PIC__) && (100 * __GNUC__ + __GNUC_MINOR__ >= 303)
__attribute__((visibility("protected")))
#endif
int __overflow(FILE *, int), __uflow(FILE *);

int __fseeko(FILE*, off_t, int);
int __fseeko_unlocked(FILE*, off_t, int);
off_t __ftello(FILE*);
off_t __ftello_unlocked(FILE*);
size_t __fwritex(const unsigned char*, size_t, FILE*);
int __putc_unlocked(int, FILE*);

FILE* __fdopen(int, const char*);
int __fmodeflags(const char*);

FILE* __ofl_add(FILE* f);
FILE** __ofl_lock(void);
void __ofl_unlock(void);

#define feof(f) ((f)->flags & F_EOF)
#define ferror(f) ((f)->flags & F_ERR)

#define getc_unlocked(f) (((f)->rpos < (f)->rend) ? *(f)->rpos++ : __uflow((f)))

#define putc_unlocked(c, f)                                  \
  (((unsigned char)(c) != (f)->lbf && (f)->wpos < (f)->wend) \
       ? *(f)->wpos++ = (c)                                  \
       : __overflow((f), (c)))

/* Caller-allocated FILE * operations */
FILE* __fopen_rb_ca(const char*, FILE*, unsigned char*, size_t);
int __fclose_ca(FILE*);

#endif