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/* $Id: straprintf.cpp $ */
/** @file
* IPRT - Allocating String Formatters.
*/
/*
* Copyright (C) 2006-2020 Oracle Corporation
*
* 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 (GPL) 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.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE 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.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/string.h>
#include "internal/iprt.h"
#include <iprt/assert.h>
#include <iprt/alloc.h>
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
/** strallocoutput() argument structure. */
typedef struct STRALLOCARG
{
/** Pointer to current buffer position. */
char *psz;
/** Number of bytes left in the buffer - not including the trailing zero. */
size_t cch;
/** Pointer to the start of the buffer. */
char *pszBuffer;
/** The number of bytes in the buffer. */
size_t cchBuffer;
/** Set if the buffer was allocated using RTMemRealloc(). If clear
* pszBuffer points to the initial stack buffer. */
bool fAllocated;
/** Allocation tag used for statistics and such. */
const char *pszTag;
} STRALLOCARG;
/** Pointer to a strallocoutput() argument structure. */
typedef STRALLOCARG *PSTRALLOCARG;
/*********************************************************************************************************************************
* Internal Functions *
*********************************************************************************************************************************/
static DECLCALLBACK(size_t) strallocoutput(void *pvArg, const char *pachChars, size_t cbChars);
/**
* Output callback.
*
* @returns number of bytes written.
* @param pvArg Pointer to a STRBUFARG structure.
* @param pachChars Pointer to an array of utf-8 characters.
* @param cbChars Number of bytes in the character array pointed to by pachChars.
*/
static DECLCALLBACK(size_t) strallocoutput(void *pvArg, const char *pachChars, size_t cbChars)
{
PSTRALLOCARG pArg = (PSTRALLOCARG)pvArg;
if (pArg->psz)
{
/*
* The fast path
*/
if (cbChars <= pArg->cch)
{
if (cbChars)
{
memcpy(pArg->psz, pachChars, cbChars);
pArg->cch -= cbChars;
pArg->psz += cbChars;
}
*pArg->psz = '\0';
return cbChars;
}
/*
* Need to (re)allocate the buffer.
*/
size_t cbAdded = RT_MIN(pArg->cchBuffer, _1M);
if (cbAdded <= cbChars)
cbAdded = RT_ALIGN_Z(cbChars, _4K);
if (cbAdded <= _1G)
{
char *pszBuffer = (char *)RTMemReallocTag(pArg->fAllocated ? pArg->pszBuffer : NULL,
cbAdded + pArg->cchBuffer, pArg->pszTag);
if (pszBuffer)
{
size_t off = pArg->psz - pArg->pszBuffer;
if (!pArg->fAllocated)
{
memcpy(pszBuffer, pArg->pszBuffer, off);
pArg->fAllocated = true;
}
pArg->pszBuffer = pszBuffer;
pArg->cchBuffer += cbAdded;
pArg->psz = pszBuffer + off;
pArg->cch += cbAdded;
if (cbChars)
{
memcpy(pArg->psz, pachChars, cbChars);
pArg->cch -= cbChars;
pArg->psz += cbChars;
}
*pArg->psz = '\0';
return cbChars;
}
/* else allocation failure */
}
/* else wrap around */
/* failure */
pArg->psz = NULL;
}
return 0;
}
RTDECL(int) RTStrAPrintfVTag(char **ppszBuffer, const char *pszFormat, va_list args, const char *pszTag)
{
#ifdef IN_RING3
char szBuf[2048];
#else
char szBuf[256];
#endif
STRALLOCARG Arg;
Arg.fAllocated = false;
Arg.cchBuffer = sizeof(szBuf);
Arg.pszBuffer = szBuf;
Arg.cch = sizeof(szBuf) - 1;
Arg.psz = szBuf;
Arg.pszTag = pszTag;
szBuf[0] = '\0';
int cbRet = (int)RTStrFormatV(strallocoutput, &Arg, NULL, NULL, pszFormat, args);
if (Arg.psz)
{
if (!Arg.fAllocated)
{
/* duplicate the string in szBuf */
Assert(Arg.pszBuffer == szBuf);
char *psz = (char *)RTMemAllocTag(cbRet + 1, pszTag);
if (psz)
memcpy(psz, szBuf, cbRet + 1);
*ppszBuffer = psz;
}
else
{
/* adjust the allocated buffer */
char *psz = (char *)RTMemReallocTag(Arg.pszBuffer, cbRet + 1, pszTag);
*ppszBuffer = psz ? psz : Arg.pszBuffer;
}
}
else
{
/* allocation error */
*ppszBuffer = NULL;
cbRet = -1;
/* free any allocated buffer */
if (Arg.fAllocated)
RTMemFree(Arg.pszBuffer);
}
return cbRet;
}
RT_EXPORT_SYMBOL(RTStrAPrintfVTag);
RTDECL(char *) RTStrAPrintf2VTag(const char *pszFormat, va_list args, const char *pszTag)
{
char *pszBuffer;
RTStrAPrintfVTag(&pszBuffer, pszFormat, args, pszTag);
return pszBuffer;
}
RT_EXPORT_SYMBOL(RTStrAPrintf2VTag);
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