sl@0: /*
sl@0: * Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description:
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: 
sl@0: #ifndef _SYS_STDIO_T_H_
sl@0: #define _SYS_STDIO_T_H_
sl@0: #ifdef __cplusplus
sl@0: extern "C" {
sl@0: #endif
sl@0: 
sl@0: #include <_ansi.h>
sl@0: 
sl@0: /**
sl@0: Stdio buffers.
sl@0: @publishedAll
sl@0: @released
sl@0: */
sl@0: struct __sbuf {
sl@0: 	unsigned char *	_base;
sl@0: 	int				_size;
sl@0: };
sl@0: 
sl@0: /**
sl@0: We need fpos_t for the following, but it doesn't have a leading "_",
sl@0: so we use _fpos_t instead.
sl@0: @publishedAll
sl@0: @released
sl@0: */
sl@0: 
sl@0: typedef long _fpos_t;		/* XXX must match off_t in <sys/types.h> */
sl@0: 							/* (and must be `long' for now) */
sl@0: 
sl@0: /**
sl@0: Stdio state variables.
sl@0: 
sl@0: The following always hold:
sl@0: 
sl@0: if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
sl@0: 	_lbfsize is -_bf._size, else _lbfsize is 0
sl@0: if _flags&__SRD, _w is 0
sl@0: 	if _flags&__SWR, _r is 0
sl@0: 
sl@0: This ensures that the getc and putc macros (or inline functions) never
sl@0: try to write or read from a file that is in `read' or `write' mode.
sl@0: (Moreover, they can, and do, automatically switch from read mode to
sl@0: write mode, and back, on "r+" and "w+" files.)
sl@0: 
sl@0: _lbfsize is used only to make the inline line-buffered output stream
sl@0: code as compact as possible.
sl@0: 
sl@0: _ub, _up, and _ur are used when ungetc() pushes back more characters
sl@0: than fit in the current _bf, or when ungetc() pushes back a character
sl@0: that does not match the previous one in _bf.  When this happens,
sl@0: _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
sl@0: _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
sl@0: @publishedAll
sl@0: @released
sl@0: */
sl@0: struct __sFILE {
sl@0:   unsigned char *_p;			/* current position in (some) buffer */
sl@0:   int			 _r;			/* read space left for getc() */
sl@0:   int			 _w;			/* write space left for putc() */
sl@0:   short			 _flags;		/* flags, below; this FILE is free if 0 */
sl@0:   short			 _file;			/* fileno, if Unix descriptor, else -1 */
sl@0:   struct __sbuf	 _bf;			/* the buffer (at least 1 byte, if !NULL) */
sl@0:   int			 _lbfsize;		/* 0 or -_bf._size, for inline putc */
sl@0: 
sl@0:   /* operations */
sl@0:   void *		 _cookie;		/* cookie passed to io functions */
sl@0: 
sl@0:   int		(*_read) (void * _cookie, char *_buf, int _n);
sl@0:   int		(*_write)(void * _cookie, const char *_buf, int _n);
sl@0:   _fpos_t	(*_seek) (void * _cookie, _fpos_t _offset, int _whence);
sl@0:   int		(*_close)(void * _cookie);
sl@0: 
sl@0:   /* separate buffer for long sequences of ungetc() */
sl@0:   struct __sbuf		_ub;		/* ungetc buffer */
sl@0:   unsigned char *	_up;		/* saved _p when _p is doing ungetc data */
sl@0:   int				_ur;		/* saved _r when _r is counting ungetc data */
sl@0: 
sl@0:   /* tricks to meet minimum requirements even when malloc() fails */
sl@0:   unsigned char		_ubuf[3];	/* guarantee an ungetc() buffer */
sl@0:   unsigned char		_nbuf[1];	/* guarantee a getc() buffer */
sl@0: 
sl@0:   /* separate buffer for fgetline() when line crosses buffer boundary */
sl@0:   struct __sbuf		_lb;		/* buffer for fgetline() */
sl@0: 
sl@0:   /* Unix stdio files get aligned to block boundaries on fseek() */
sl@0:   int				_blksize;	/* stat.st_blksize (may be != _bf._size) */
sl@0:   int				_offset;	/* current lseek offset */
sl@0: 
sl@0:   struct _reent *	_data;		/* pointer back to re-entrancy context block */
sl@0: };
sl@0: 
sl@0: 
sl@0: #ifdef __cplusplus
sl@0: }
sl@0: #endif
sl@0: #endif /* _SYS_STDIO_T_H_ */