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/* $Id: SUPR3HardenedNoCrt.cpp $ */
/** @file
* VirtualBox Support Library - Hardened main() no-crt routines.
*/
/*
* 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 *
*********************************************************************************************************************************/
#if RT_OS_WINDOWS
# include <iprt/win/windows.h>
#endif
#include <VBox/sup.h>
#include "SUPLibInternal.h"
#ifdef SUP_HARDENED_NEED_CRT_FUNCTIONS /** @todo this crap is obsolete. */
/** memcmp */
DECLHIDDEN(int) suplibHardenedMemComp(void const *pvDst, const void *pvSrc, size_t cbToComp)
{
size_t const *puDst = (size_t const *)pvDst;
size_t const *puSrc = (size_t const *)pvSrc;
while (cbToComp >= sizeof(size_t))
{
if (*puDst != *puSrc)
break;
puDst++;
puSrc++;
cbToComp -= sizeof(size_t);
}
uint8_t const *pbDst = (uint8_t const *)puDst;
uint8_t const *pbSrc = (uint8_t const *)puSrc;
while (cbToComp > 0)
{
if (*pbDst != *pbSrc)
{
if (*pbDst < *pbSrc)
return -1;
return 1;
}
pbDst++;
pbSrc++;
cbToComp--;
}
return 0;
}
/** memcpy */
DECLHIDDEN(void *) suplibHardenedMemCopy(void *pvDst, const void *pvSrc, size_t cbToCopy)
{
size_t *puDst = (size_t *)pvDst;
size_t const *puSrc = (size_t const *)pvSrc;
while (cbToCopy >= sizeof(size_t))
{
*puDst++ = *puSrc++;
cbToCopy -= sizeof(size_t);
}
uint8_t *pbDst = (uint8_t *)puDst;
uint8_t const *pbSrc = (uint8_t const *)puSrc;
while (cbToCopy > 0)
{
*pbDst++ = *pbSrc++;
cbToCopy--;
}
return pvDst;
}
/** memset */
DECLHIDDEN(void *) suplibHardenedMemSet(void *pvDst, int ch, size_t cbToSet)
{
uint8_t *pbDst = (uint8_t *)pvDst;
while (cbToSet > 0)
{
*pbDst++ = (uint8_t)ch;
cbToSet--;
}
return pvDst;
}
/** strcpy */
DECLHIDDEN(char *) suplibHardenedStrCopy(char *pszDst, const char *pszSrc)
{
char *pszRet = pszDst;
char ch;
do
{
ch = *pszSrc++;
*pszDst++ = ch;
} while (ch);
return pszRet;
}
/** strlen */
DECLHIDDEN(size_t) suplibHardenedStrLen(const char *psz)
{
const char *pszStart = psz;
while (*psz)
psz++;
return psz - pszStart;
}
/** strcat */
DECLHIDDEN(char *) suplibHardenedStrCat(char *pszDst, const char *pszSrc)
{
char *pszRet = pszDst;
while (*pszDst)
pszDst++;
suplibHardenedStrCopy(pszDst, pszSrc);
return pszRet;
}
/** strcmp */
DECLHIDDEN(int) suplibHardenedStrCmp(const char *psz1, const char *psz2)
{
for (;;)
{
char ch1 = *psz1++;
char ch2 = *psz2++;
if (ch1 != ch2)
return ch1 < ch2 ? -1 : 1;
if (ch1 == 0)
return 0;
}
}
/** strncmp */
DECLHIDDEN(int) suplibHardenedStrNCmp(const char *psz1, const char *psz2, size_t cchMax)
{
while (cchMax-- > 0)
{
char ch1 = *psz1++;
char ch2 = *psz2++;
if (ch1 != ch2)
return ch1 < ch2 ? -1 : 1;
if (ch1 == 0)
break;
}
return 0;
}
#endif /* SUP_HARDENED_NEED_CRT_FUNCTIONS */
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