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/* $Id: RTPathAppendEx.cpp.h $ */
/** @file
* IPRT - rtPathAppendEx - Code Template.
*/
/*
* Copyright (C) 2009-2023 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
*/
/**
* 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.)
*/
DECLINLINE(size_t) RTPATH_STYLE_FN(rtPathRootSpecLen2)(const char *pszPath)
{
/* fend of wildlife. */
if (!pszPath)
return 0;
/* Root slash? */
if (RTPATH_IS_SLASH(pszPath[0]))
{
#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
/* 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 RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
/* 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;
}
/** Internal worker for RTPathAppendEx. */
DECLINLINE(int) RTPATH_STYLE_FN(rtPathAppendEx)(char *pszPath, size_t cbPathDst, char *pszPathEnd,
const char *pszAppend, size_t cchAppend)
{
/*
* Balance slashes and check for buffer overflow.
*/
if (!RTPATH_IS_SLASH(pszPathEnd[-1]))
{
if (!RTPATH_IS_SLASH(pszAppend[0]))
{
#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
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 = RTPATH_STYLE_FN(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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