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/* $Id: strprintf.cpp 155244 2023-01-17 14:15:46Z bird $ */
/** @file
* IPRT - String Formatters.
*/
/*
* Copyright (C) 2006-2023 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/string.h>
#include "internal/iprt.h"
#include <iprt/assert.h>
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
/** strbufoutput() argument structure. */
typedef struct STRBUFARG
{
/** Pointer to current buffer position. */
char *psz;
/** Number of bytes left in the buffer - not including the trailing zero. */
size_t cch;
} STRBUFARG;
/** Pointer to a strbufoutput() argument structure. */
typedef STRBUFARG *PSTRBUFARG;
/*********************************************************************************************************************************
* Internal Functions *
*********************************************************************************************************************************/
static DECLCALLBACK(size_t) strbufoutput(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) strbufoutput(void *pvArg, const char *pachChars, size_t cbChars)
{
PSTRBUFARG pArg = (PSTRBUFARG)pvArg;
char *pszCur = pArg->psz; /* We actually have to spell this out for VS2010, or it will load for each case. */
cbChars = RT_MIN(pArg->cch, cbChars);
if (cbChars)
{
pArg->cch -= cbChars;
/* Note! For VS2010/64 we need at least 7 case statements before it generates a jump table. */
switch (cbChars)
{
default:
memcpy(pszCur, pachChars, cbChars);
break;
case 8: pszCur[7] = pachChars[7]; RT_FALL_THRU();
case 7: pszCur[6] = pachChars[6]; RT_FALL_THRU();
case 6: pszCur[5] = pachChars[5]; RT_FALL_THRU();
case 5: pszCur[4] = pachChars[4]; RT_FALL_THRU();
case 4: pszCur[3] = pachChars[3]; RT_FALL_THRU();
case 3: pszCur[2] = pachChars[2]; RT_FALL_THRU();
case 2: pszCur[1] = pachChars[1]; RT_FALL_THRU();
case 1: pszCur[0] = pachChars[0]; RT_FALL_THRU();
case 0:
break;
}
pArg->psz = pszCur += cbChars;
}
*pszCur = '\0';
return cbChars;
}
RTDECL(size_t) RTStrPrintfV(char *pszBuffer, size_t cchBuffer, const char *pszFormat, va_list args)
{
STRBUFARG Arg;
AssertMsgReturn(cchBuffer, ("Excellent idea! Format a string with no space for the output!\n"), 0);
Arg.psz = pszBuffer;
Arg.cch = cchBuffer - 1;
return RTStrFormatV(strbufoutput, &Arg, NULL, NULL, pszFormat, args);
}
RT_EXPORT_SYMBOL(RTStrPrintfV);
RTDECL(size_t) RTStrPrintfExV(PFNSTRFORMAT pfnFormat, void *pvArg, char *pszBuffer, size_t cchBuffer, const char *pszFormat, va_list args)
{
STRBUFARG Arg;
AssertMsgReturn(cchBuffer, ("Excellent idea! Format a string with no space for the output!\n"), 0);
Arg.psz = pszBuffer;
Arg.cch = cchBuffer - 1;
return RTStrFormatV(strbufoutput, &Arg, pfnFormat, pvArg, pszFormat, args);
}
RT_EXPORT_SYMBOL(RTStrPrintfExV);
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