542 lines
20 KiB
C
542 lines
20 KiB
C
/** @file
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* IPRT - I/O Stream.
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*/
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/*
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* Copyright (C) 2006-2023 Oracle and/or its affiliates.
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*
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* This file is part of VirtualBox base platform packages, as
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* available from https://www.virtualbox.org.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, in version 3 of the
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* License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses>.
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*
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* The contents of this file may alternatively be used under the terms
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* of the Common Development and Distribution License Version 1.0
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* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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* in the VirtualBox distribution, in which case the provisions of the
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* CDDL are applicable instead of those of the GPL.
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*
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* You may elect to license modified versions of this file under the
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* terms and conditions of either the GPL or the CDDL or both.
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*
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* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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*/
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#ifndef IPRT_INCLUDED_stream_h
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#define IPRT_INCLUDED_stream_h
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#ifndef RT_WITHOUT_PRAGMA_ONCE
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# pragma once
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#endif
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#include <iprt/cdefs.h>
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#include <iprt/types.h>
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#include <iprt/stdarg.h>
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RT_C_DECLS_BEGIN
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/** @defgroup grp_rt_stream RTStrm - File Streams
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* @ingroup grp_rt
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* @{
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*/
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#ifndef IPRT_INCLUDED_message_h
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/** Pointer to a stream. */
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typedef struct RTSTREAM *PRTSTREAM;
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#endif
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/** Pointer to the standard input stream. */
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extern RTDATADECL(PRTSTREAM) g_pStdIn;
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/** Pointer to the standard error stream. */
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extern RTDATADECL(PRTSTREAM) g_pStdErr;
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/** Pointer to the standard output stream. */
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extern RTDATADECL(PRTSTREAM) g_pStdOut;
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/**
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* Opens a file stream.
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*
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* @returns iprt status code.
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* @param pszFilename Path to the file to open.
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* @param pszMode The open mode. See fopen() standard.
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* Format: <a|r|w>[+][b|t][x][e|N|E]
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* - 'a': Open or create file and writes
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* append tos it.
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* - 'r': Open existing file and read from it.
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* - 'w': Open or truncate existing file and write
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* to it.
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* - '+': Open for both read and write access.
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* - 'b' / 't': binary / text
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* - 'x': exclusively create, no open. Only
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* possible with 'w'.
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* - 'e' / 'N': No inherit on exec. (The 'e' is
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* how Linux and FreeBSD expresses this, the
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* latter is Visual C++).
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* @param ppStream Where to store the opened stream.
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*/
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RTR3DECL(int) RTStrmOpen(const char *pszFilename, const char *pszMode, PRTSTREAM *ppStream);
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/**
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* Opens a file stream.
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*
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* @returns iprt status code.
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* @param pszMode The open mode. See fopen() standard.
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* Format: <a|r|w>[+][b|t][x][e|N|E]
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* - 'a': Open or create file and writes
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* append tos it.
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* - 'r': Open existing file and read from it.
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* - 'w': Open or truncate existing file and write
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* to it.
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* - '+': Open for both read and write access.
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* - 'b' / 't': binary / text
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* - 'x': exclusively create, no open. Only
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* possible with 'w'.
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* - 'e' / 'N': No inherit on exec. (The 'e' is
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* how Linux and FreeBSD expresses this, the
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* latter is Visual C++).
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* @param ppStream Where to store the opened stream.
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* @param pszFilenameFmt Filename path format string.
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* @param args Arguments to the format string.
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*/
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RTR3DECL(int) RTStrmOpenFV(const char *pszMode, PRTSTREAM *ppStream, const char *pszFilenameFmt,
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va_list args) RT_IPRT_FORMAT_ATTR(3, 0);
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/**
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* Opens a file stream.
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*
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* @returns iprt status code.
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* @param pszMode The open mode. See fopen() standard.
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* Format: <a|r|w>[+][b|t][x][e|N|E]
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* - 'a': Open or create file and writes
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* append tos it.
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* - 'r': Open existing file and read from it.
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* - 'w': Open or truncate existing file and write
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* to it.
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* - '+': Open for both read and write access.
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* - 'b' / 't': binary / text
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* - 'x': exclusively create, no open. Only
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* possible with 'w'.
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* - 'e' / 'N': No inherit on exec. (The 'e' is
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* how Linux and FreeBSD expresses this, the
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* latter is Visual C++).
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* @param ppStream Where to store the opened stream.
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* @param pszFilenameFmt Filename path format string.
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* @param ... Arguments to the format string.
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*/
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RTR3DECL(int) RTStrmOpenF(const char *pszMode, PRTSTREAM *ppStream, const char *pszFilenameFmt, ...) RT_IPRT_FORMAT_ATTR(3, 4);
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/**
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* Opens a file stream for a RTFILE handle, taking ownership of the handle.
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*
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* @returns iprt status code.
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* @param hFile The file handle to use. On success, handle
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* ownership is transfered to the stream and it will be
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* closed when the stream closes.
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* @param pszMode The open mode, accept the same as RTStrOpen and
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* friends however it is only used to figure out what
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* we can do with the handle.
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* @param fFlags Reserved, must be zero.
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* @param ppStream Where to store the opened stream.
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*/
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RTR3DECL(int) RTStrmOpenFileHandle(RTFILE hFile, const char *pszMode, uint32_t fFlags, PRTSTREAM *ppStream);
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/**
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* Queries the file handle backing the stream.
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*
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* @returns iprt status code.
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* @retval VERR_NOT_AVAILABLE if the stream has no valid handle associated with
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* it.
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*
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* @param pStream The stream.
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* @param phFile Where to return the file handle. This should not be
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* closed!
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*/
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RTR3DECL(int) RTStrmQueryFileHandle(PRTSTREAM pStream, PRTFILE phFile);
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/**
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* Closes the specified stream.
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*
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* @returns iprt status code.
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* @param pStream The stream to close.
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*
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* @note The stream will be closed and freed even when failure is returned.
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* It cannot be used again after this call. The error status is only
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* to indicate that the flushing of buffers or the closing of the
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* underlying file handle failed.
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*/
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RTR3DECL(int) RTStrmClose(PRTSTREAM pStream);
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/**
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* Get the pending error of the stream.
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*
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* @returns iprt status code. of the stream.
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* @param pStream The stream.
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*/
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RTR3DECL(int) RTStrmError(PRTSTREAM pStream);
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/**
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* Clears stream error condition.
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*
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* All stream operations save RTStrmClose and this will fail
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* while an error is asserted on the stream
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*
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* @returns iprt status code.
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* @param pStream The stream.
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*/
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RTR3DECL(int) RTStrmClearError(PRTSTREAM pStream);
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/**
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* Changes the stream mode.
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*
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* @returns iprt status code.
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* @param pStream The stream.
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* @param fBinary The desired binary (@c true) / text mode (@c false).
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* Pass -1 to leave it unchanged.
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* @param fCurrentCodeSet Whether converting the stream from UTF-8 to the
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* current code set is desired (@c true) or not (@c
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* false). Pass -1 to leave this property unchanged.
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*/
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RTR3DECL(int) RTStrmSetMode(PRTSTREAM pStream, int fBinary, int fCurrentCodeSet);
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/** Stream buffering modes. */
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typedef enum RTSTRMBUFMODE
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{
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RTSTRMBUFMODE_INVALID = 0,
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RTSTRMBUFMODE_FULL, /**< Full buffering. */
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RTSTRMBUFMODE_LINE, /**< Line buffering. On Windows this could be the same as RTSTRMBUFMODE_FULL. */
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RTSTRMBUFMODE_UNBUFFERED, /**< No buffering. */
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RTSTRMBUFMODE_END,
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RTSTRMBUFMODE_32BIT_HACK = 0x7fffffff
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} RTSTRMBUFMODE;
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/**
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* Changes the stream buffering mode.
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*
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* @returns iprt status code.
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* @param pStream The stream.
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* @param enmBufMode The new buffering mode.
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*/
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RTR3DECL(int) RTStrmSetBufferingMode(PRTSTREAM pStream, RTSTRMBUFMODE enmBufMode);
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/**
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* Returns the current echo mode.
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*
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* This works only for standard input streams.
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*
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* @returns iprt status code.
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* @retval VERR_INVALID_FUNCTION if not a TTY.
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* @param pStream The stream.
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* @param pfEchoChars Where to store the flag whether typed characters are echoed.
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*/
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RTR3DECL(int) RTStrmInputGetEchoChars(PRTSTREAM pStream, bool *pfEchoChars);
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/**
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* Changes the behavior for echoing inpit characters on the command line.
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*
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* This works only for standard input streams.
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*
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* @returns iprt status code.
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* @retval VERR_INVALID_FUNCTION if not a TTY.
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* @param pStream The stream.
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* @param fEchoChars Flag whether echoing typed characters is wanted.
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*/
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RTR3DECL(int) RTStrmInputSetEchoChars(PRTSTREAM pStream, bool fEchoChars);
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/**
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* Checks if this is a terminal (TTY) or not.
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*
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* @returns true if it is, false if it isn't or the stream isn't valid.
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* @param pStream The stream.
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*/
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RTR3DECL(bool) RTStrmIsTerminal(PRTSTREAM pStream);
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/**
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* Gets the width of the terminal the stream is associated with.
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*
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* @returns IPRT status code.
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* @retval VERR_INVALID_FUNCTION if not connected to a terminal.
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* @param pStream The stream.
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* @param pcchWidth Where to return the width. This will never be zero
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* and always be set, even on error.
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*/
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RTR3DECL(int) RTStrmQueryTerminalWidth(PRTSTREAM pStream, uint32_t *pcchWidth);
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/**
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* Rewinds the stream.
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*
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* Stream errors will be reset on success.
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*
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* @returns IPRT status code.
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*
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* @param pStream The stream.
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*
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* @remarks Not all streams are rewindable and that behavior is currently
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* undefined for those.
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*/
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RTR3DECL(int) RTStrmRewind(PRTSTREAM pStream);
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/**
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* Changes the file position.
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*
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* @returns IPRT status code.
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*
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* @param pStream The stream.
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* @param off The seek offset.
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* @param uMethod Seek method, i.e. one of the RTFILE_SEEK_* defines.
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*
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* @remarks Not all streams are seekable and that behavior is currently
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* undefined for those.
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*/
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RTR3DECL(int) RTStrmSeek(PRTSTREAM pStream, RTFOFF off, uint32_t uMethod);
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/**
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* Tells the stream position.
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*
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* @returns Stream position or IPRT error status. Non-negative numbers are
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* stream positions, while negative numbers are IPRT error stauses.
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*
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* @param pStream The stream.
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*
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* @remarks Not all streams have a position and that behavior is currently
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* undefined for those.
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*/
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RTR3DECL(RTFOFF) RTStrmTell(PRTSTREAM pStream);
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/**
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* Reads from a file stream.
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*
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* @returns iprt status code.
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* @param pStream The stream.
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* @param pvBuf Where to put the read bits.
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* Must be cbRead bytes or more.
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* @param cbToRead Number of bytes to read.
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* @param pcbRead Where to store the number of bytes actually read.
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* If NULL cbRead bytes are read or an error is returned.
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*/
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RTR3DECL(int) RTStrmReadEx(PRTSTREAM pStream, void *pvBuf, size_t cbToRead, size_t *pcbRead);
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/**
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* Writes to a file stream.
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*
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* @returns iprt status code.
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* @param pStream The stream.
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* @param pvBuf Where to get the bits to write from.
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* @param cbToWrite Number of bytes to write.
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* @param pcbWritten Where to store the number of bytes actually written.
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* If NULL cbWrite bytes are written or an error is returned.
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*/
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RTR3DECL(int) RTStrmWriteEx(PRTSTREAM pStream, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten);
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/**
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* Reads from a file stream.
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*
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* @returns iprt status code.
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* @param pStream The stream.
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* @param pvBuf Where to put the read bits.
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* Must be cbRead bytes or more.
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* @param cbToRead Number of bytes to read.
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*/
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DECLINLINE(int) RTStrmRead(PRTSTREAM pStream, void *pvBuf, size_t cbToRead)
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{
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return RTStrmReadEx(pStream, pvBuf, cbToRead, NULL);
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}
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/**
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* Writes to a file stream.
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*
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* @returns iprt status code.
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* @param pStream The stream.
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* @param pvBuf Where to get the bits to write from.
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* @param cbToWrite Number of bytes to write.
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*/
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DECLINLINE(int) RTStrmWrite(PRTSTREAM pStream, const void *pvBuf, size_t cbToWrite)
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{
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return RTStrmWriteEx(pStream, pvBuf, cbToWrite, NULL);
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}
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/**
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* Reads a character from a file stream.
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*
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* @returns The char as an unsigned char cast to int.
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* @returns -1 on failure.
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* @param pStream The stream.
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*/
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RTR3DECL(int) RTStrmGetCh(PRTSTREAM pStream);
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/**
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* Writes a character to a file stream.
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*
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* @returns iprt status code.
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* @param pStream The stream.
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* @param ch The char to write.
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*/
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RTR3DECL(int) RTStrmPutCh(PRTSTREAM pStream, int ch);
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/**
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* Writes a string to a file stream.
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*
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* @returns iprt status code.
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* @param pStream The stream.
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* @param pszString The string to write.
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* No newlines or anything are appended or prepended.
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* The terminating '\\0' is not written, of course.
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*/
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RTR3DECL(int) RTStrmPutStr(PRTSTREAM pStream, const char *pszString);
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/**
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* Reads a line from a file stream.
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*
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* A line ends with a '\\n', '\\r\\n', '\\0' or the end of the file.
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*
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* @returns iprt status code.
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* @retval VINF_BUFFER_OVERFLOW if the buffer wasn't big enough to read an
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* entire line.
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* @retval VERR_BUFFER_OVERFLOW if a lone '\\r' was encountered at the end of
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* the buffer and we ended up dropping the following character.
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*
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* @param pStream The stream.
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* @param pszString Where to store the line.
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* The line will *NOT* contain any '\\n'.
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* @param cbString The size of the string buffer.
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*/
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RTR3DECL(int) RTStrmGetLine(PRTSTREAM pStream, char *pszString, size_t cbString);
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/**
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* Flushes a stream.
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*
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* @returns iprt status code.
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* @param pStream The stream to flush.
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*/
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RTR3DECL(int) RTStrmFlush(PRTSTREAM pStream);
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/**
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* Prints a formatted string to the specified stream.
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*
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* @returns Number of bytes printed.
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* @param pStream The stream to print to.
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* @param pszFormat Runtime format string.
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* @param ... Arguments specified by pszFormat.
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*/
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RTR3DECL(int) RTStrmPrintf(PRTSTREAM pStream, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(2, 3);
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/**
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* Prints a formatted string to the specified stream.
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*
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* @returns Number of bytes printed.
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* @param pStream The stream to print to.
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* @param pszFormat Runtime format string.
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* @param args Arguments specified by pszFormat.
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*/
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RTR3DECL(int) RTStrmPrintfV(PRTSTREAM pStream, const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(2, 0);
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/**
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* Prints a formatted string to the specified stream, performing wrapping of
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* lines considered too long.
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*
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* If the stream is to a terminal, the terminal width is used as the max line
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* width. Otherwise, the width is taken from @a fFlags
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* (RTSTRMWRAPPED_F_NON_TERMINAL_WIDTH_MASK /
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* RTSTRMWRAPPED_F_NON_TERMINAL_WIDTH_SHIFT), defaulting to 80 if zero.
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*
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* @returns Low 16 bits is the line offset, high 16 bits the number of lines
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* outputted. Apply RTSTRMWRAPPED_F_LINE_OFFSET_MASK to the value and
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* it can be passed via @a fFlags to the next invocation (not necessary
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* if all format strings ends with a newline).
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* Negative values are IPRT error status codes.
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* @param pStream The stream to print to.
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* @param fFlags RTSTRMWRAPPED_F_XXX - flags, configuration and state.
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* @param pszFormat Runtime format string.
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* @param ... Arguments specified by pszFormat.
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* @sa RTStrmWrappedPrintfV, RTStrmPrintf, RTStrmPrintfV
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*/
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RTDECL(int32_t) RTStrmWrappedPrintf(PRTSTREAM pStream, uint32_t fFlags, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(3, 4);
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/**
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* Prints a formatted string to the specified stream, performing wrapping of
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* lines considered too long.
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*
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* If the stream is to a terminal, the terminal width is used as the max line
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* width. Otherwise, the width is taken from @a fFlags
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* (RTSTRMWRAPPED_F_NON_TERMINAL_WIDTH_MASK /
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* RTSTRMWRAPPED_F_NON_TERMINAL_WIDTH_SHIFT), defaulting to 80 if zero.
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*
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* @returns Low 16 bits is the line offset, high 16 bits the number of lines
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* outputted. Apply RTSTRMWRAPPED_F_LINE_OFFSET_MASK to the value and
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* it can be passed via @a fFlags to the next invocation (not necessary
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* if all format strings ends with a newline).
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* Negative values are IPRT error status codes.
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* @param pStream The stream to print to.
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* @param fFlags RTSTRMWRAPPED_F_XXX - flags, configuration and state.
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* @param pszFormat Runtime format string.
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* @param va Arguments specified by pszFormat.
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* @sa RTStrmWrappedPrintf, RTStrmPrintf, RTStrmPrintfV
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*/
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RTDECL(int32_t) RTStrmWrappedPrintfV(PRTSTREAM pStream, uint32_t fFlags, const char *pszFormat,
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va_list va) RT_IPRT_FORMAT_ATTR(3, 0);
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/** @name RTSTRMWRAPPED_F_XXX - Flags for RTStrmWrappedPrintf &
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* RTStrmWrappedPrintfV.
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* @{ */
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/** The current line offset mask.
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* This should be used to passed the line off state from one call to the next
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* when printing incomplete lines. If all format strings ends with a newline,
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* this is not necessary. */
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#define RTSTRMWRAPPED_F_LINE_OFFSET_MASK UINT32_C(0x00000fff)
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/** The non-terminal width mask. Defaults to 80 if not specified (zero). */
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#define RTSTRMWRAPPED_F_NON_TERMINAL_WIDTH_MASK UINT32_C(0x000ff000)
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/** The non-terminal width shift. */
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#define RTSTRMWRAPPED_F_NON_TERMINAL_WIDTH_SHIFT 12
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/** The hanging indent level mask - defaults to 4 if zero.
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* Used when RTSTRMWRAPPED_F_HANGING_INDENT is set. */
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#define RTSTRMWRAPPED_F_HANGING_INDENT_MASK UINT32_C(0x01f00000)
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/** The hanging indent level shift. */
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#define RTSTRMWRAPPED_F_HANGING_INDENT_SHIFT 20
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/** Hanging indent. Used for command synopsis and such. */
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#define RTSTRMWRAPPED_F_HANGING_INDENT UINT32_C(0x80000000)
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/** @} */
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/**
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* Dumper vprintf-like function outputting to a stream.
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*
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* @param pvUser The stream to print to. NULL means standard output.
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* @param pszFormat Runtime format string.
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* @param va Arguments specified by pszFormat.
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|
*/
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|
RTR3DECL(void) RTStrmDumpPrintfV(void *pvUser, const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(2, 0);
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|
|
/**
|
|
* Prints a formatted string to the standard output stream (g_pStdOut).
|
|
*
|
|
* @returns Number of bytes printed.
|
|
* @param pszFormat Runtime format string.
|
|
* @param ... Arguments specified by pszFormat.
|
|
*/
|
|
RTR3DECL(int) RTPrintf(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
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|
|
|
/**
|
|
* Prints a formatted string to the standard output stream (g_pStdOut).
|
|
*
|
|
* @returns Number of bytes printed.
|
|
* @param pszFormat Runtime format string.
|
|
* @param args Arguments specified by pszFormat.
|
|
*/
|
|
RTR3DECL(int) RTPrintfV(const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(1, 0);
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|
|
|
/** @} */
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|
|
|
RT_C_DECLS_END
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|
|
|
#endif /* !IPRT_INCLUDED_stream_h */
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