source: vbox/trunk/include/iprt/stream.h@ 1890

/** @file
 * InnoTek Portable Runtime - I/O Stream.
 */

/*
 * Copyright (C) 2006 InnoTek Systemberatung GmbH
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License as published by the Free Software Foundation,
 * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
 * distribution. VirtualBox OSE is distributed in the hope that it will
 * be useful, but WITHOUT ANY WARRANTY of any kind.
 *
 * If you received this file as part of a commercial VirtualBox
 * distribution, then only the terms of your commercial VirtualBox
 * license agreement apply instead of the previous paragraph.
 */

#ifndef __iprt_stream_h__
#define __iprt_stream_h__

#include <iprt/cdefs.h>
#include <iprt/types.h>
#include <iprt/stdarg.h>

__BEGIN_DECLS

/** @defgroup grp_rt_stream     RTStrm - File Streams
 * @ingroup grp_rt
 * @{
 */

/** Pointer to a stream. */
typedef struct RTSTREAM *PRTSTREAM;

/** Pointer to the standard input stream. */
extern RTDATADECL(PRTSTREAM)    g_pStdIn;

/** Pointer to the standard error stream. */
extern RTDATADECL(PRTSTREAM)    g_pStdErr;

/** Pointer to the standard output stream. */
extern RTDATADECL(PRTSTREAM)    g_pStdOut;


/**
 * Opens a file stream.
 *
 * @returns iprt status code.
 * @param   pszFilename     Path to the file to open.
 * @param   pszMode         The open mode. See fopen() standard.
 *                          Format: <a|r|w>[+][b|t]
 * @param   ppStream        Where to store the opened stream.
 */
RTR3DECL(int) RTStrmOpen(const char *pszFilename, const char *pszMode, PRTSTREAM *ppStream);

/**
 * Closes the specified stream.
 *
 * @returns iprt status code.
 * @param   pStream         The stream to close.
 */
RTR3DECL(int) RTStrmClose(PRTSTREAM pStream);

/**
 * Reads from a file stream.
 *
 * @returns iprt status code.
 * @param   pStream         The stream.
 * @param   pvBuf           Where to put the read bits.
 *                          Must be cbRead bytes or more.
 * @param   cbRead          Number of bytes to read.
 * @param   pcbRead         Where to store the number of bytes actually read.
 *                          If NULL cbRead bytes are read or an error is returned.
 */
RTR3DECL(int) RTStrmReadEx(PRTSTREAM pStream, void *pvBuf, size_t cbRead, size_t *pcbRead);

/**
 * Writes to a file stream.
 *
 * @returns iprt status code.
 * @param   pStream         The stream.
 * @param   pvBuf           Where to get the bits to write from.
 * @param   cbWrite         Number of bytes to write.
 * @param   pcbWritten      Where to store the number of bytes actually written.
 *                          If NULL cbWrite bytes are written or an error is returned.
 */
RTR3DECL(int) RTStrmWriteEx(PRTSTREAM pStream, const void *pvBuf, size_t cbWrite, size_t *pcbWritten);

/**
 * Reads from a file stream.
 *
 * @returns iprt status code.
 * @param   pStream         The stream.
 * @param   pvBuf           Where to put the read bits.
 *                          Must be cbRead bytes or more.
 * @param   cbRead          Number of bytes to read.
 */
DECLINLINE(int) RTStrmRead(PRTSTREAM pStream, void *pvBuf, size_t cbRead)
{
    return RTStrmReadEx(pStream, pvBuf, cbRead, NULL);
}

/**
 * Writes to a file stream.
 *
 * @returns iprt status code.
 * @param   pStream         The stream.
 * @param   pvBuf           Where to get the bits to write from.
 * @param   cbWrite         Number of bytes to write.
 */
DECLINLINE(int) RTStrmWrite(PRTSTREAM pStream, const void *pvBuf, size_t cbWrite)
{
    return RTStrmWriteEx(pStream, pvBuf, cbWrite, NULL);
}

/**
 * Reads a character from a file stream.
 *
 * @returns The char as an unsigned char cast to int.
 * @returns -1 on failure.
 * @param   pStream         The stream.
 */
RTR3DECL(int) RTStrmGetCh(PRTSTREAM pStream);

/**
 * Writes a character to a file stream.
 *
 * @returns iprt status code.
 * @param   pStream         The stream.
 * @param   ch              The char to write.
 */
RTR3DECL(int) RTStrmPutCh(PRTSTREAM pStream, int ch);

/**
 * Writes a string to a file stream.
 *
 * @returns iprt status code.
 * @param   pStream         The stream.
 * @param   pszString       The string to write.
 *                          No newlines or anything is appended or prepended.
 *                          The terminating '\\0' is not written, of course.
 */
RTR3DECL(int) RTStrmPutStr(PRTSTREAM pStream, const char *pszString);

/**
 * Reads a line from a file stream.
 * A line ends with a '\\n', '\\0' or the end of the file.
 *
 * @returns iprt status code.
 * @returns VINF_BUFFER_OVERFLOW if the buffer wasn't big enough to read an entire line.
 * @param   pStream         The stream.
 * @param   pszString       Where to store the line.
 *                          The line will *NOT* contain any '\\n'.
 * @param   cchString       The size of the string buffer.
 */
RTR3DECL(int) RTStrmGetLine(PRTSTREAM pStream, char *pszString, size_t cchString);

/**
 * Flushes a stream.
 *
 * @returns iprt status code.
 * @param   pStream         The stream to flush.
 */
RTR3DECL(int) RTStrmFlush(PRTSTREAM pStream);

/**
 * Prints a formatted string to the specified stream.
 *
 * @returns Number of bytes printed.
 * @param   pStream         The stream to print to.
 * @param   pszFormat       Runtime format string.
 * @param   ...             Arguments specified by pszFormat.
 */
RTR3DECL(int) RTStrmPrintf(PRTSTREAM pStream, const char *pszFormat, ...);

/**
 * Prints a formatted string to the specified stream.
 *
 * @returns Number of bytes printed.
 * @param   pStream         The stream to print to.
 * @param   pszFormat       Runtime format string.
 * @param   args            Arguments specified by pszFormat.
 */
RTR3DECL(int) RTStrmPrintfV(PRTSTREAM pStream, const char *pszFormat, va_list args);

/**
 * 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, ...);

/**
 * 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);

/** @} */

__END_DECLS

#endif