libio.h

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#define _IO_file_flags _flags

  /* The following pointers correspond to the C++ streambuf protocol. */
  /* Note:  Tk uses the _IO_read_ptr and _IO_read_end fields directly. */
  char* _IO_read_ptr;	/* Current read pointer */
  char* _IO_read_end;	/* End of get area. */
  char* _IO_read_base;	/* Start of putback+get area. */
  char* _IO_write_base;	/* Start of put area. */
  char* _IO_write_ptr;	/* Current put pointer. */
  char* _IO_write_end;	/* End of put area. */
  char* _IO_buf_base;	/* Start of reserve area. */
  char* _IO_buf_end;	/* End of reserve area. */
  /* The following fields are used to support backing up and undo. */
  char *_IO_save_base; /* Pointer to start of non-current get area. */
  char *_IO_backup_base;  /* Pointer to first valid character of backup area */
  char *_IO_save_end; /* Pointer to end of non-current get area. */

  struct _IO_marker *_markers;

  struct _IO_FILE *_chain;

  int _fileno;
#if 0
  int _blksize;
#else
  int _flags2;
#endif
  _IO_off_t _old_offset; /* This used to be _offset but it's too small.  */

#define __HAVE_COLUMN /* temporary */
  /* 1+column number of pbase(); 0 is unknown. */
  unsigned short _cur_column;
  signed char _vtable_offset;
  char _shortbuf[1];

  /*  char* _save_gptr;  char* _save_egptr; */

  _IO_lock_t *_lock;
#ifdef _IO_USE_OLD_IO_FILE
};

struct _IO_FILE_complete
{
  struct _IO_FILE _file;
#endif
#if defined _G_IO_IO_FILE_VERSION && _G_IO_IO_FILE_VERSION == 0x20001
  _IO_off64_t _offset;
# if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
  /* Wide character stream stuff.  */
  struct _IO_codecvt *_codecvt;
  struct _IO_wide_data *_wide_data;
# else
  void *__pad1;
  void *__pad2;
# endif
  int _mode;
  /* Make sure we don't get into trouble again.  */
  char _unused2[15 * sizeof (int) - 2 * sizeof (void *)];
#endif
};

#ifndef __cplusplus
typedef struct _IO_FILE _IO_FILE;
#endif

struct _IO_FILE_plus;

extern struct _IO_FILE_plus _IO_2_1_stdin_;
extern struct _IO_FILE_plus _IO_2_1_stdout_;
extern struct _IO_FILE_plus _IO_2_1_stderr_;
#ifndef _LIBC
#define _IO_stdin ((_IO_FILE*)(&_IO_2_1_stdin_))
#define _IO_stdout ((_IO_FILE*)(&_IO_2_1_stdout_))
#define _IO_stderr ((_IO_FILE*)(&_IO_2_1_stderr_))
#else
extern _IO_FILE *_IO_stdin attribute_hidden;
extern _IO_FILE *_IO_stdout attribute_hidden;
extern _IO_FILE *_IO_stderr attribute_hidden;
#endif


/* Functions to do I/O and file management for a stream.  */

/* Read NBYTES bytes from COOKIE into a buffer pointed to by BUF.
   Return number of bytes read.  */
typedef __ssize_t __io_read_fn (void *__cookie, char *__buf, size_t __nbytes);

/* Write N bytes pointed to by BUF to COOKIE.  Write all N bytes
   unless there is an error.  Return number of bytes written, or -1 if
   there is an error without writing anything.  If the file has been
   opened for append (__mode.__append set), then set the file pointer
   to the end of the file and then do the write; if not, just write at
   the current file pointer.  */
typedef __ssize_t __io_write_fn (void *__cookie, __const char *__buf,
				 size_t __n);

/* Move COOKIE's file position to *POS bytes from the
   beginning of the file (if W is SEEK_SET),
   the current position (if W is SEEK_CUR),
   or the end of the file (if W is SEEK_END).
   Set *POS to the new file position.
   Returns zero if successful, nonzero if not.  */
typedef int __io_seek_fn (void *__cookie, _IO_off64_t *__pos, int __w);

/* Close COOKIE.  */
typedef int __io_close_fn (void *__cookie);


#ifdef _GNU_SOURCE
/* User-visible names for the above.  */
typedef __io_read_fn cookie_read_function_t;
typedef __io_write_fn cookie_write_function_t;
typedef __io_seek_fn cookie_seek_function_t;
typedef __io_close_fn cookie_close_function_t;

/* The structure with the cookie function pointers.  */
typedef struct
{
  __io_read_fn *read;		/* Read bytes.  */
  __io_write_fn *write;		/* Write bytes.  */
  __io_seek_fn *seek;		/* Seek/tell file position.  */
  __io_close_fn *close;		/* Close file.  */
} _IO_cookie_io_functions_t;
typedef _IO_cookie_io_functions_t cookie_io_functions_t;

struct _IO_cookie_file;

/* Initialize one of those.  */
extern void _IO_cookie_init (struct _IO_cookie_file *__cfile, int __read_write,
			     void *__cookie, _IO_cookie_io_functions_t __fns);
#endif


#ifdef __cplusplus
extern "C" {
#endif

extern int __underflow (_IO_FILE *) __THROW;
extern int __uflow (_IO_FILE *) __THROW;
extern int __overflow (_IO_FILE *, int) __THROW;
extern _IO_wint_t __wunderflow (_IO_FILE *) __THROW;
extern _IO_wint_t __wuflow (_IO_FILE *) __THROW;
extern _IO_wint_t __woverflow (_IO_FILE *, _IO_wint_t) __THROW;

#if  __GNUC__ >= 3
# define _IO_BE(expr, res) __builtin_expect (expr, res)
#else
# define _IO_BE(expr, res) (expr)
#endif

#define _IO_getc_unlocked(_fp) \
       (_IO_BE ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end, 0) \
	? __uflow (_fp) : *(unsigned char *) (_fp)->_IO_read_ptr++)
#define _IO_peekc_unlocked(_fp) \
       (_IO_BE ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end, 0) \
	  && __underflow (_fp) == EOF ? EOF \
	: *(unsigned char *) (_fp)->_IO_read_ptr)
#define _IO_putc_unlocked(_ch, _fp) \
   (_IO_BE ((_fp)->_IO_write_ptr >= (_fp)->_IO_write_end, 0) \
    ? __overflow (_fp, (unsigned char) (_ch)) \
    : (unsigned char) (*(_fp)->_IO_write_ptr++ = (_ch)))

#define _IO_getwc_unlocked(_fp) \
  (_IO_BE ((_fp)->_wide_data->_IO_read_ptr >= (_fp)->_wide_data->_IO_read_end,\
	   0) \
   ? __wuflow (_fp) : (_IO_wint_t) *(_fp)->_wide_data->_IO_read_ptr++)
#define _IO_putwc_unlocked(_wch, _fp) \
  (_IO_BE ((_fp)->_wide_data->_IO_write_ptr \
	   >= (_fp)->_wide_data->_IO_write_end, 0) \
   ? __woverflow (_fp, _wch) \
   : (_IO_wint_t) (*(_fp)->_wide_data->_IO_write_ptr++ = (_wch)))

#define _IO_feof_unlocked(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0)
#define _IO_ferror_unlocked(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0)

extern int _IO_getc (_IO_FILE *__fp) __THROW;
extern int _IO_putc (int __c, _IO_FILE *__fp) __THROW;
extern int _IO_feof (_IO_FILE *__fp) __THROW;
extern int _IO_ferror (_IO_FILE *__fp) __THROW;

extern int _IO_peekc_locked (_IO_FILE *__fp) __THROW;

/* This one is for Emacs. */
#define _IO_PENDING_OUTPUT_COUNT(_fp)	\
	((_fp)->_IO_write_ptr - (_fp)->_IO_write_base)

extern void _IO_flockfile (_IO_FILE *) __THROW;
extern void _IO_funlockfile (_IO_FILE *) __THROW;
extern int _IO_ftrylockfile (_IO_FILE *) __THROW;

#ifdef _IO_MTSAFE_IO
# define _IO_peekc(_fp) _IO_peekc_locked (_fp)
# define _IO_flockfile(_fp) \
  if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_flockfile (_fp)
# define _IO_funlockfile(_fp) \
  if (((_fp)->_flags & _IO_USER_LOCK) == 0) _IO_funlockfile (_fp)
#else
# define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
# define _IO_flockfile(_fp) /**/
# define _IO_funlockfile(_fp) /**/
# define _IO_ftrylockfile(_fp) /**/
# define _IO_cleanup_region_start(_fct, _fp) /**/
# define _IO_cleanup_region_end(_Doit) /**/
#endif /* !_IO_MTSAFE_IO */

extern int _IO_vfscanf (_IO_FILE * __restrict, const char * __restrict,
			_IO_va_list, int *__restrict) __THROW;
extern int _IO_vfprintf (_IO_FILE *__restrict, const char *__restrict,
			 _IO_va_list) __THROW;
extern _IO_ssize_t _IO_padn (_IO_FILE *, int, _IO_ssize_t) __THROW;
extern _IO_size_t _IO_sgetn (_IO_FILE *, void *, _IO_size_t) __THROW;

extern _IO_off64_t _IO_seekoff (_IO_FILE *, _IO_off64_t, int, int) __THROW;
extern _IO_off64_t _IO_seekpos (_IO_FILE *, _IO_off64_t, int) __THROW;

extern void _IO_free_backup_area (_IO_FILE *) __THROW;

#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
extern _IO_wint_t _IO_getwc (_IO_FILE *__fp) __THROW;
extern _IO_wint_t _IO_putwc (wchar_t __wc, _IO_FILE *__fp) __THROW;
extern int _IO_fwide (_IO_FILE *__fp, int __mode) __THROW;
# if __GNUC__ >= 2
/* While compiling glibc we have to handle compatibility with very old
   versions.  */
#  if defined _LIBC && defined SHARED
#   include <shlib-compat.h>
#   if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
#    define _IO_fwide_maybe_incompatible \
  (__builtin_expect (&_IO_stdin_used == NULL, 0))
extern const int _IO_stdin_used;
weak_extern (_IO_stdin_used);
#   endif
#  endif
#  ifndef _IO_fwide_maybe_incompatible
#   define _IO_fwide_maybe_incompatible (0)
#  endif
/* A special optimized version of the function above.  It optimizes the
   case of initializing an unoriented byte stream.  */
#  define _IO_fwide(__fp, __mode) \
  ({ int __result = (__mode);						      \
     if (__result < 0 && ! _IO_fwide_maybe_incompatible)		      \
       {								      \
	 if ((__fp)->_mode == 0)					      \
	   /* We know that all we have to do is to set the flag.  */	      \
	   (__fp)->_mode = -1;						      \
	 __result = (__fp)->_mode;					      \
       }								      \
     else if (__builtin_constant_p (__mode) && (__mode) == 0)		      \
       __result = _IO_fwide_maybe_incompatible ? -1 : (__fp)->_mode;	      \
     else								      \
       __result = _IO_fwide (__fp, __result);				      \
     __result; })
# endif

extern int _IO_vfwscanf (_IO_FILE * __restrict, const wchar_t * __restrict,
			 _IO_va_list, int *__restrict) __THROW;
extern int _IO_vfwprintf (_IO_FILE *__restrict, const wchar_t *__restrict,
			  _IO_va_list) __THROW;
extern _IO_ssize_t _IO_wpadn (_IO_FILE *, wint_t, _IO_ssize_t) __THROW;
extern void _IO_free_wbackup_area (_IO_FILE *) __THROW;
#endif

#ifdef __cplusplus
}
#endif

#endif /* _IO_STDIO_H */