williamr@2: /*
williamr@2: * Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
williamr@2: * All rights reserved.
williamr@2: * This component and the accompanying materials are made available
williamr@4: * under the terms of "Eclipse Public License v1.0"
williamr@2: * which accompanies this distribution, and is available
williamr@4: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
williamr@2: *
williamr@2: * Initial Contributors:
williamr@2: * Nokia Corporation - initial contribution.
williamr@2: *
williamr@2: * Contributors:
williamr@2: *
williamr@2: * Description:
williamr@2: *
williamr@2: */
williamr@2: 
williamr@2: 
williamr@2: 
williamr@2: #ifndef _SYS_STDIO_T_H_
williamr@2: #define _SYS_STDIO_T_H_
williamr@2: #ifdef __cplusplus
williamr@2: extern "C" {
williamr@2: #endif
williamr@2: 
williamr@2: #include <_ansi.h>
williamr@2: 
williamr@2: /**
williamr@2: Stdio buffers.
williamr@2: @publishedAll
williamr@2: @released
williamr@2: */
williamr@2: struct __sbuf {
williamr@2: 	unsigned char *	_base;
williamr@2: 	int				_size;
williamr@2: };
williamr@2: 
williamr@2: /**
williamr@2: We need fpos_t for the following, but it doesn't have a leading "_",
williamr@2: so we use _fpos_t instead.
williamr@2: @publishedAll
williamr@2: @released
williamr@2: */
williamr@2: 
williamr@2: typedef long _fpos_t;		/* XXX must match off_t in <sys/types.h> */
williamr@2: 							/* (and must be `long' for now) */
williamr@2: 
williamr@2: /**
williamr@2: Stdio state variables.
williamr@2: 
williamr@2: The following always hold:
williamr@2: 
williamr@2: if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
williamr@2: 	_lbfsize is -_bf._size, else _lbfsize is 0
williamr@2: if _flags&__SRD, _w is 0
williamr@2: 	if _flags&__SWR, _r is 0
williamr@2: 
williamr@2: This ensures that the getc and putc macros (or inline functions) never
williamr@2: try to write or read from a file that is in `read' or `write' mode.
williamr@2: (Moreover, they can, and do, automatically switch from read mode to
williamr@2: write mode, and back, on "r+" and "w+" files.)
williamr@2: 
williamr@2: _lbfsize is used only to make the inline line-buffered output stream
williamr@2: code as compact as possible.
williamr@2: 
williamr@2: _ub, _up, and _ur are used when ungetc() pushes back more characters
williamr@2: than fit in the current _bf, or when ungetc() pushes back a character
williamr@2: that does not match the previous one in _bf.  When this happens,
williamr@2: _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
williamr@2: _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
williamr@2: @publishedAll
williamr@2: @released
williamr@2: */
williamr@2: struct __sFILE {
williamr@2:   unsigned char *_p;			/* current position in (some) buffer */
williamr@2:   int			 _r;			/* read space left for getc() */
williamr@2:   int			 _w;			/* write space left for putc() */
williamr@2:   short			 _flags;		/* flags, below; this FILE is free if 0 */
williamr@2:   short			 _file;			/* fileno, if Unix descriptor, else -1 */
williamr@2:   struct __sbuf	 _bf;			/* the buffer (at least 1 byte, if !NULL) */
williamr@2:   int			 _lbfsize;		/* 0 or -_bf._size, for inline putc */
williamr@2: 
williamr@2:   /* operations */
williamr@2:   void *		 _cookie;		/* cookie passed to io functions */
williamr@2: 
williamr@2:   int		(*_read) (void * _cookie, char *_buf, int _n);
williamr@2:   int		(*_write)(void * _cookie, const char *_buf, int _n);
williamr@2:   _fpos_t	(*_seek) (void * _cookie, _fpos_t _offset, int _whence);
williamr@2:   int		(*_close)(void * _cookie);
williamr@2: 
williamr@2:   /* separate buffer for long sequences of ungetc() */
williamr@2:   struct __sbuf		_ub;		/* ungetc buffer */
williamr@2:   unsigned char *	_up;		/* saved _p when _p is doing ungetc data */
williamr@2:   int				_ur;		/* saved _r when _r is counting ungetc data */
williamr@2: 
williamr@2:   /* tricks to meet minimum requirements even when malloc() fails */
williamr@2:   unsigned char		_ubuf[3];	/* guarantee an ungetc() buffer */
williamr@2:   unsigned char		_nbuf[1];	/* guarantee a getc() buffer */
williamr@2: 
williamr@2:   /* separate buffer for fgetline() when line crosses buffer boundary */
williamr@2:   struct __sbuf		_lb;		/* buffer for fgetline() */
williamr@2: 
williamr@2:   /* Unix stdio files get aligned to block boundaries on fseek() */
williamr@2:   int				_blksize;	/* stat.st_blksize (may be != _bf._size) */
williamr@2:   int				_offset;	/* current lseek offset */
williamr@2: 
williamr@2:   struct _reent *	_data;		/* pointer back to re-entrancy context block */
williamr@2: };
williamr@2: 
williamr@2: 
williamr@2: #ifdef __cplusplus
williamr@2: }
williamr@2: #endif
williamr@2: #endif /* _SYS_STDIO_T_H_ */