/*

* Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

* which accompanies this distribution, and is available

* at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

#ifndef _SYS_STDIO_T_H_

#define _SYS_STDIO_T_H_

#ifdef __cplusplus

extern "C" {

#endif

#include <_ansi.h>

/**

Stdio buffers.

@publishedAll

@released

*/

struct __sbuf {

	unsigned char *	_base;

	int				_size;

};

/**

We need fpos_t for the following, but it doesn't have a leading "_",

so we use _fpos_t instead.

@publishedAll

@released

*/

typedef long _fpos_t;		/* XXX must match off_t in <sys/types.h> */

							/* (and must be `long' for now) */

/**

Stdio state variables.

The following always hold:

if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),

	_lbfsize is -_bf._size, else _lbfsize is 0

if _flags&__SRD, _w is 0

	if _flags&__SWR, _r is 0

This ensures that the getc and putc macros (or inline functions) never

try to write or read from a file that is in `read' or `write' mode.

(Moreover, they can, and do, automatically switch from read mode to

write mode, and back, on "r+" and "w+" files.)

_lbfsize is used only to make the inline line-buffered output stream

code as compact as possible.

_ub, _up, and _ur are used when ungetc() pushes back more characters

than fit in the current _bf, or when ungetc() pushes back a character

that does not match the previous one in _bf.  When this happens,

_ub._base becomes non-nil (i.e., a stream has ungetc() data iff

_ub._base!=NULL) and _up and _ur save the current values of _p and _r.

@publishedAll

@released

*/

struct __sFILE {

  unsigned char *_p;			/* current position in (some) buffer */

  int			 _r;			/* read space left for getc() */

  int			 _w;			/* write space left for putc() */

  short			 _flags;		/* flags, below; this FILE is free if 0 */

  short			 _file;			/* fileno, if Unix descriptor, else -1 */

  struct __sbuf	 _bf;			/* the buffer (at least 1 byte, if !NULL) */

  int			 _lbfsize;		/* 0 or -_bf._size, for inline putc */

  /* operations */

  void *		 _cookie;		/* cookie passed to io functions */

  int		(*_read) (void * _cookie, char *_buf, int _n);

  int		(*_write)(void * _cookie, const char *_buf, int _n);

  _fpos_t	(*_seek) (void * _cookie, _fpos_t _offset, int _whence);

  int		(*_close)(void * _cookie);

  /* separate buffer for long sequences of ungetc() */

  struct __sbuf		_ub;		/* ungetc buffer */

  unsigned char *	_up;		/* saved _p when _p is doing ungetc data */

  int				_ur;		/* saved _r when _r is counting ungetc data */

  /* tricks to meet minimum requirements even when malloc() fails */

  unsigned char		_ubuf[3];	/* guarantee an ungetc() buffer */

  unsigned char		_nbuf[1];	/* guarantee a getc() buffer */

  /* separate buffer for fgetline() when line crosses buffer boundary */

  struct __sbuf		_lb;		/* buffer for fgetline() */

  /* Unix stdio files get aligned to block boundaries on fseek() */

  int				_blksize;	/* stat.st_blksize (may be != _bf._size) */

  int				_offset;	/* current lseek offset */

  struct _reent *	_data;		/* pointer back to re-entrancy context block */

};

#ifdef __cplusplus

}

#endif

#endif /* _SYS_STDIO_T_H_ */