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/* $Id: RTPathAppendEx.cpp $ */
/** @file
* IPRT - RTPathAppendEx
*/
/*
* Copyright (C) 2009-2020 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 "internal/iprt.h"
#include <iprt/path.h>
#include <iprt/assert.h>
#include <iprt/ctype.h>
#include <iprt/errcore.h>
#include <iprt/string.h>
/**
* Figures the length of the root part of the path.
*
* @returns length of the root specifier.
* @retval 0 if none.
*
* @param pszPath The path to investigate.
*
* @remarks Unnecessary root slashes will not be counted. The caller will have
* to deal with it where it matters. (Unlike rtPathRootSpecLen which
* counts them.)
*/
static size_t rtPathRootSpecLen2(const char *pszPath)
{
/* fend of wildlife. */
if (!pszPath)
return 0;
/* Root slash? */
if (RTPATH_IS_SLASH(pszPath[0]))
{
#if defined (RT_OS_OS2) || defined (RT_OS_WINDOWS)
/* UNC? */
if ( RTPATH_IS_SLASH(pszPath[1])
&& pszPath[2] != '\0'
&& !RTPATH_IS_SLASH(pszPath[2]))
{
/* Find the end of the server name. */
const char *pszEnd = pszPath + 2;
pszEnd += 2;
while ( *pszEnd != '\0'
&& !RTPATH_IS_SLASH(*pszEnd))
pszEnd++;
if (RTPATH_IS_SLASH(*pszEnd))
{
pszEnd++;
while (RTPATH_IS_SLASH(*pszEnd))
pszEnd++;
/* Find the end of the share name */
while ( *pszEnd != '\0'
&& !RTPATH_IS_SLASH(*pszEnd))
pszEnd++;
if (RTPATH_IS_SLASH(*pszEnd))
pszEnd++;
return pszPath - pszEnd;
}
}
#endif
return 1;
}
#if defined (RT_OS_OS2) || defined (RT_OS_WINDOWS)
/* Drive specifier? */
if ( pszPath[0] != '\0'
&& pszPath[1] == ':'
&& RT_C_IS_ALPHA(pszPath[0]))
{
if (RTPATH_IS_SLASH(pszPath[2]))
return 3;
return 2;
}
#endif
return 0;
}
RTDECL(int) RTPathAppendEx(char *pszPath, size_t cbPathDst, const char *pszAppend, size_t cchAppendMax)
{
char *pszPathEnd = RTStrEnd(pszPath, cbPathDst);
AssertReturn(pszPathEnd, VERR_INVALID_PARAMETER);
/*
* Special cases.
*/
if (!pszAppend)
return VINF_SUCCESS;
size_t cchAppend = RTStrNLen(pszAppend, cchAppendMax);
if (!cchAppend)
return VINF_SUCCESS;
if (pszPathEnd == pszPath)
{
if (cchAppend >= cbPathDst)
return VERR_BUFFER_OVERFLOW;
memcpy(pszPath, pszAppend, cchAppend);
pszPath[cchAppend] = '\0';
return VINF_SUCCESS;
}
/*
* Balance slashes and check for buffer overflow.
*/
if (!RTPATH_IS_SLASH(pszPathEnd[-1]))
{
if (!RTPATH_IS_SLASH(pszAppend[0]))
{
#if defined (RT_OS_OS2) || defined (RT_OS_WINDOWS)
if ( (size_t)(pszPathEnd - pszPath) == 2
&& pszPath[1] == ':'
&& RT_C_IS_ALPHA(pszPath[0]))
{
if ((size_t)(pszPathEnd - pszPath) + cchAppend >= cbPathDst)
return VERR_BUFFER_OVERFLOW;
}
else
#endif
{
if ((size_t)(pszPathEnd - pszPath) + 1 + cchAppend >= cbPathDst)
return VERR_BUFFER_OVERFLOW;
*pszPathEnd++ = RTPATH_SLASH;
}
}
else
{
/* One slash is sufficient at this point. */
while (cchAppend > 1 && RTPATH_IS_SLASH(pszAppend[1]))
pszAppend++, cchAppend--;
if ((size_t)(pszPathEnd - pszPath) + cchAppend >= cbPathDst)
return VERR_BUFFER_OVERFLOW;
}
}
else
{
/* No slashes needed in the appended bit. */
while (cchAppend && RTPATH_IS_SLASH(*pszAppend))
pszAppend++, cchAppend--;
/* In the leading path we can skip unnecessary trailing slashes, but
be sure to leave one. */
size_t const cchRoot = rtPathRootSpecLen2(pszPath);
while ( (size_t)(pszPathEnd - pszPath) > RT_MAX(1, cchRoot)
&& RTPATH_IS_SLASH(pszPathEnd[-2]))
pszPathEnd--;
if ((size_t)(pszPathEnd - pszPath) + cchAppend >= cbPathDst)
return VERR_BUFFER_OVERFLOW;
}
/*
* What remains now is the just the copying.
*/
memcpy(pszPathEnd, pszAppend, cchAppend);
pszPathEnd[cchAppend] = '\0';
return VINF_SUCCESS;
}
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