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