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/* $Id: vfsprintf.cpp $ */
/** @file
* IPRT - Virtual File System, File Printf.
*/
/*
* Copyright (C) 2010-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program 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 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/vfs.h>
#include <iprt/errcore.h>
#include <iprt/string.h>
/** Writes the buffer to the VFS file. */
static void FlushPrintfBuffer(PVFSIOSTRMOUTBUF pBuf)
{
if (pBuf->offBuf)
{
int rc = RTVfsIoStrmWrite(pBuf->hVfsIos, pBuf->szBuf, pBuf->offBuf, true /*fBlocking*/, NULL);
if (RT_FAILURE(rc))
pBuf->rc = rc;
pBuf->offBuf = 0;
pBuf->szBuf[0] = '\0';
}
}
/**
* @callback_method_impl{FNRTSTROUTPUT,
* For use with VFSIOSTRMOUTBUF.}
*/
RTDECL(size_t) RTVfsIoStrmStrOutputCallback(void *pvArg, const char *pachChars, size_t cbChars)
{
PVFSIOSTRMOUTBUF pBuf = (PVFSIOSTRMOUTBUF)pvArg;
AssertReturn(pBuf->cbSelf == sizeof(*pBuf), 0);
if (cbChars != 0)
{
if (cbChars <= sizeof(pBuf->szBuf) * 3 / 2)
{
/*
* Small piece of output: Buffer it.
*/
size_t offSrc = 0;
while (offSrc < cbChars)
{
size_t cbLeft = sizeof(pBuf->szBuf) - pBuf->offBuf - 1;
if (cbLeft > 0)
{
size_t cbToCopy = RT_MIN(cbChars - offSrc, cbLeft);
memcpy(&pBuf->szBuf[pBuf->offBuf], &pachChars[offSrc], cbToCopy);
pBuf->offBuf += cbToCopy;
pBuf->szBuf[pBuf->offBuf] = '\0';
if (cbLeft > cbToCopy)
break;
offSrc += cbToCopy;
}
FlushPrintfBuffer(pBuf);
}
}
else
{
/*
* Large chunk of output: Output it directly.
*/
FlushPrintfBuffer(pBuf);
int rc = RTVfsIoStrmWrite(pBuf->hVfsIos, pachChars, cbChars, true /*fBlocking*/, NULL);
if (RT_FAILURE(rc))
pBuf->rc = rc;
}
}
else /* Special zero byte write at the end of the formatting. */
FlushPrintfBuffer(pBuf);
return cbChars;
}
RTDECL(ssize_t) RTVfsIoStrmPrintfV(RTVFSIOSTREAM hVfsIos, const char *pszFormat, va_list va)
{
VFSIOSTRMOUTBUF Buf;
VFSIOSTRMOUTBUF_INIT(&Buf, hVfsIos);
size_t cchRet = RTStrFormatV(RTVfsIoStrmStrOutputCallback, &Buf, NULL, NULL, pszFormat, va);
if (RT_SUCCESS(Buf.rc))
return cchRet;
return Buf.rc;
}
RTDECL(ssize_t) RTVfsIoStrmPrintf(RTVFSIOSTREAM hVfsIos, const char *pszFormat, ...)
{
va_list va;
va_start(va, pszFormat);
ssize_t cchRet = RTVfsIoStrmPrintfV(hVfsIos, pszFormat, va);
va_end(va);
return cchRet;
}
RTDECL(ssize_t) RTVfsFilePrintfV(RTVFSFILE hVfsFile, const char *pszFormat, va_list va)
{
ssize_t cchRet;
RTVFSIOSTREAM hVfsIos = RTVfsFileToIoStream(hVfsFile);
if (hVfsIos != NIL_RTVFSIOSTREAM)
{
cchRet = RTVfsIoStrmPrintfV(hVfsIos, pszFormat, va);
RTVfsIoStrmRelease(hVfsIos);
}
else
cchRet = VERR_INVALID_HANDLE;
return cchRet;
}
RTDECL(ssize_t) RTVfsFilePrintf(RTVFSFILE hVfsFile, const char *pszFormat, ...)
{
ssize_t cchRet;
RTVFSIOSTREAM hVfsIos = RTVfsFileToIoStream(hVfsFile);
if (hVfsIos != NIL_RTVFSIOSTREAM)
{
va_list va;
va_start(va, pszFormat);
cchRet = RTVfsIoStrmPrintfV(hVfsIos, pszFormat, va);
va_end(va);
RTVfsIoStrmRelease(hVfsIos);
}
else
cchRet = VERR_INVALID_HANDLE;
return cchRet;
}
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