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/* $Id: RTPathSplit.cpp $ */
/** @file
* IPRT - RTPathSplit
*/
/*
* Copyright (C) 2013-2019 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/err.h>
#include <iprt/string.h>
RTDECL(int) RTPathSplit(const char *pszPath, PRTPATHSPLIT pSplit, size_t cbSplit, uint32_t fFlags)
{
/*
* Input validation.
*/
AssertReturn(cbSplit >= RT_UOFFSETOF(RTPATHSPLIT, apszComps), VERR_INVALID_PARAMETER);
AssertPtrReturn(pSplit, VERR_INVALID_POINTER);
AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
AssertReturn(*pszPath, VERR_PATH_ZERO_LENGTH);
AssertReturn(RTPATH_STR_F_IS_VALID(fFlags, 0), VERR_INVALID_FLAGS);
/*
* Use RTPathParse to do the parsing.
* - This makes the ASSUMPTION that the output of this function is greater
* or equal to that of RTPathParsed.
* - We're aliasing the buffer here, so use volatile to avoid issues due to
* compiler optimizations.
*/
RTPATHPARSED volatile *pParsedVolatile = (RTPATHPARSED volatile *)pSplit;
RTPATHSPLIT volatile *pSplitVolatile = (RTPATHSPLIT volatile *)pSplit;
AssertCompile(sizeof(*pParsedVolatile) <= sizeof(*pSplitVolatile));
AssertCompile(sizeof(pParsedVolatile->aComps[0]) <= sizeof(pSplitVolatile->apszComps[0]));
int rc = RTPathParse(pszPath, (PRTPATHPARSED)pParsedVolatile, cbSplit, fFlags);
if (RT_FAILURE(rc) && rc != VERR_BUFFER_OVERFLOW)
return rc;
/*
* Calculate the required buffer space.
*/
uint16_t const cComps = pParsedVolatile->cComps;
uint16_t const fProps = pParsedVolatile->fProps;
uint16_t const cchPath = pParsedVolatile->cchPath;
uint16_t const offSuffix = pParsedVolatile->offSuffix;
uint32_t cbNeeded = RT_UOFFSETOF_DYN(RTPATHSPLIT, apszComps[cComps])
+ cchPath
+ RTPATH_PROP_FIRST_NEEDS_NO_SLASH(fProps) /* zero terminator for root spec. */
- RT_BOOL(fProps & RTPATH_PROP_DIR_SLASH) /* counted by cchPath, not included in the comp str. */
+ 1; /* zero terminator. */
if (cbNeeded > cbSplit)
{
pSplitVolatile->cbNeeded = cbNeeded;
return VERR_BUFFER_OVERFLOW;
}
Assert(RT_SUCCESS(rc));
/*
* Convert the array and copy the strings, both backwards.
*/
char *psz = (char *)pSplit + cbNeeded;
uint32_t idxComp = cComps - 1;
/* the final component first (because of suffix handling). */
uint16_t offComp = pParsedVolatile->aComps[idxComp].off;
uint16_t cchComp = pParsedVolatile->aComps[idxComp].cch;
*--psz = '\0';
psz -= cchComp;
memcpy(psz, &pszPath[offComp], cchComp);
pSplitVolatile->apszComps[idxComp] = psz;
char *pszSuffix;
if (offSuffix >= offComp + cchComp)
pszSuffix = &psz[cchComp];
else
pszSuffix = &psz[offSuffix - offComp];
/* the remainder */
while (idxComp-- > 0)
{
offComp = pParsedVolatile->aComps[idxComp].off;
cchComp = pParsedVolatile->aComps[idxComp].cch;
*--psz = '\0';
psz -= cchComp;
memcpy(psz, &pszPath[offComp], cchComp);
pSplitVolatile->apszComps[idxComp] = psz;
}
/*
* Store / reshuffle the non-array bits. This MUST be done after finishing
* the array processing because there may be members in RTPATHSPLIT
* overlapping the array of RTPATHPARSED.
*/
AssertCompileMembersSameSizeAndOffset(RTPATHPARSED, cComps, RTPATHSPLIT, cComps); Assert(pSplitVolatile->cComps == cComps);
AssertCompileMembersSameSizeAndOffset(RTPATHPARSED, fProps, RTPATHSPLIT, fProps); Assert(pSplitVolatile->fProps == fProps);
AssertCompileMembersSameSizeAndOffset(RTPATHPARSED, cchPath, RTPATHSPLIT, cchPath); Assert(pSplitVolatile->cchPath == cchPath);
pSplitVolatile->u16Reserved = 0;
pSplitVolatile->cbNeeded = cbNeeded;
pSplitVolatile->pszSuffix = pszSuffix;
return rc;
}
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