Adding upstream version 7.0.6-dfsg.upstream/7.0.6-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

49 files changed, 8174 insertions, 0 deletions

diff --git a/src/VBox/Runtime/common/path/Makefile.kup b/src/VBox/Runtime/common/path/Makefile.kup
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/VBox/Runtime/common/path/Makefile.kup
diff --git a/src/VBox/Runtime/common/path/RTPathAbsDup.cpp b/src/VBox/Runtime/common/path/RTPathAbsDup.cpp
new file mode 100644
index 00000000..3579c623
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathAbsDup.cpp
@@ -0,0 +1,56 @@
+/* $Id: RTPathAbsDup.cpp $ */
+/** @file
+ * IPRT - RTPathAbsDup
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+
+/**
+ * Same as RTPathAbs only the result is RTStrDup()'ed.
+ *
+ * @returns Pointer to real path. Use RTStrFree() to free this string.
+ * @returns NULL if RTPathAbs() or RTStrDup() fails.
+ * @param   pszPath         The path to resolve.
+ */
+RTDECL(char *) RTPathAbsDup(const char *pszPath)
+{
+    return RTPathAbsExDup(NULL, pszPath, RTPATH_STR_F_STYLE_HOST);
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathAbsEx.cpp b/src/VBox/Runtime/common/path/RTPathAbsEx.cpp
new file mode 100644
index 00000000..4b29a17d
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathAbsEx.cpp
@@ -0,0 +1,699 @@
+/* $Id: RTPathAbsEx.cpp $ */
+/** @file
+ * IPRT - RTPathAbsEx and RTPathAbs.
+ */
+
+/*
+ * Copyright (C) 2019-2022 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                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_PATH
+#include "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/err.h>
+#include <iprt/ctype.h>
+#include <iprt/log.h>
+#include <iprt/mem.h>
+#include <iprt/param.h>
+#include <iprt/string.h>
+#include "internal/path.h"
+
+
+
+/**
+ * Ensures that the drive letter is capitalized (prereq: RTPATH_PROP_VOLUME).
+ */
+DECLINLINE(void) rtPathAbsExUpperCaseDriveLetter(char *pszAbsPath)
+{
+    AssertReturnVoid(pszAbsPath[1] == ':');
+    char ch = *pszAbsPath;
+    AssertReturnVoid(RT_C_IS_ALPHA(ch));
+    *pszAbsPath = RT_C_TO_UPPER(ch);
+}
+
+
+/**
+ * Common worker for relative paths.
+ *
+ * Uses RTPATHABS_F_STOP_AT_BASE for RTPATHABS_F_STOP_AT_CWD.
+ */
+static int rtPathAbsExWithCwdOrBaseCommon(const char *pszBase, size_t cchBaseInPlace, PRTPATHPARSED pBaseParsed,
+                                          const char *pszPath, PRTPATHPARSED pParsed, uint32_t fFlags,
+                                          char *pszAbsPath, size_t *pcbAbsPath)
+{
+    AssertReturn(pBaseParsed->cComps > 0, VERR_INVALID_PARAMETER);
+
+    /*
+     * Clean up the base path first if necessary.
+     *
+     * Note! UNC tries to preserve the first two elements in the base path,
+     *       unless it's a \\.\ or \\?\ prefix.
+     */
+    uint32_t const iBaseStop = (pBaseParsed->fProps & (RTPATH_PROP_UNC | RTPATH_PROP_SPECIAL_UNC)) != RTPATH_PROP_UNC
+                            || pBaseParsed->cComps < 2 ? 0 : 1;
+    uint32_t       iBaseLast = iBaseStop;
+    if (pBaseParsed->fProps & (RTPATH_PROP_DOT_REFS | RTPATH_PROP_DOTDOT_REFS))
+    {
+        uint32_t const cComps = pBaseParsed->cComps;
+        uint32_t       i      = iBaseStop + 1;
+        while (i < cComps)
+        {
+            uint32_t const cchComp = pBaseParsed->aComps[i].cch;
+            if (   cchComp > 2
+                || pszPath[pBaseParsed->aComps[i].off] != '.'
+                || (cchComp == 2 && pszPath[pBaseParsed->aComps[i].off + 1] != '.') )
+                iBaseLast = i;
+            else
+            {
+                Assert(cchComp == 1 || cchComp == 2);
+                pBaseParsed->aComps[i].cch = 0;
+                if (cchComp == 2)
+                {
+                    while (iBaseLast > 0 && pBaseParsed->aComps[iBaseLast].cch == 0)
+                        iBaseLast--;
+                    if (iBaseLast > iBaseStop)
+                    {
+                        Assert(pBaseParsed->aComps[iBaseLast].cch != 0);
+                        pBaseParsed->aComps[iBaseLast].cch = 0;
+                        iBaseLast--;
+                    }
+                }
+            }
+            i++;
+        }
+        Assert(iBaseLast < cComps);
+    }
+    else
+        iBaseLast = pBaseParsed->cComps - 1;
+
+    /*
+     * Clean up the path next if needed.
+     */
+    int32_t iLast = -1; /* Is signed here! */
+    if (pParsed->fProps & (RTPATH_PROP_DOT_REFS | RTPATH_PROP_DOTDOT_REFS))
+    {
+        uint32_t const cComps = pParsed->cComps;
+        uint32_t       i      = 0;
+
+        /* If we have a volume specifier, take it from the base path. */
+        if (pParsed->fProps & RTPATH_PROP_VOLUME)
+            pParsed->aComps[i++].cch = 0;
+
+        while (i < cComps)
+        {
+            uint32_t const cchComp = pParsed->aComps[i].cch;
+            if (   cchComp > 2
+                || pszPath[pParsed->aComps[i].off] != '.'
+                || (cchComp == 2 && pszPath[pParsed->aComps[i].off + 1] != '.') )
+                iLast = i;
+            else
+            {
+                Assert(cchComp == 1 || cchComp == 2);
+                pParsed->aComps[i].cch = 0;
+                if (cchComp == 2)
+                {
+                    while (iLast >= 0 && pParsed->aComps[iLast].cch == 0)
+                        iLast--;
+                    if (iLast >= 0)
+                    {
+                        Assert(pParsed->aComps[iLast].cch != 0);
+                        pParsed->aComps[iLast].cch = 0;
+                        iLast--;
+                    }
+                    else if (   iBaseLast > iBaseStop
+                             && !(fFlags & RTPATHABS_F_STOP_AT_BASE))
+                    {
+                        while (iBaseLast > iBaseStop && pBaseParsed->aComps[iBaseLast].cch == 0)
+                            iBaseLast--;
+                        if (iBaseLast > iBaseStop)
+                        {
+                            Assert(pBaseParsed->aComps[iBaseLast].cch != 0);
+                            pBaseParsed->aComps[iBaseLast].cch = 0;
+                            iBaseLast--;
+                        }
+                    }
+                }
+            }
+            i++;
+        }
+        Assert(iLast < (int32_t)cComps);
+    }
+    else
+    {
+        /* If we have a volume specifier, take it from the base path. */
+        iLast = pParsed->cComps - 1;
+        if (pParsed->fProps & RTPATH_PROP_VOLUME)
+        {
+            pParsed->aComps[0].cch = 0;
+            if (iLast == 0)
+                iLast = -1;
+        }
+    }
+
+    /*
+     * Do we need a trailing slash in the base?
+     * If nothing is taken from pszPath, preserve its trailing slash,
+     * otherwise make sure there is a slash for joining the two.
+     */
+    Assert(!(pParsed->fProps & RTPATH_PROP_ROOT_SLASH));
+    if (pBaseParsed->cComps == 1)
+    {
+        AssertReturn(pBaseParsed->fProps & RTPATH_PROP_ROOT_SLASH, VERR_PATH_DOES_NOT_START_WITH_ROOT);
+        Assert(!(pBaseParsed->fProps & RTPATH_PROP_DIR_SLASH));
+    }
+    else
+    {
+        Assert(pBaseParsed->cComps > 1);
+        if (   iLast >= 0
+            || (pParsed->fProps & RTPATH_PROP_DIR_SLASH)
+            || (fFlags & RTPATHABS_F_ENSURE_TRAILING_SLASH) )
+            pBaseParsed->fProps |= RTPATH_PROP_DIR_SLASH;
+        else
+            pBaseParsed->fProps &= ~RTPATH_PROP_DIR_SLASH;
+    }
+
+    /* Apply the trailing flash flag to the input path: */
+    if (   iLast >= 0
+        && (fFlags & RTPATHABS_F_ENSURE_TRAILING_SLASH))
+        pParsed->fProps |= RTPATH_PROP_DIR_SLASH;
+
+    /*
+     * Combine the two.  RTPathParsedReassemble can handle in place stuff, as
+     * long as the path doesn't grow.
+     */
+    int rc = RTPathParsedReassemble(pszBase, pBaseParsed, fFlags & RTPATH_STR_F_STYLE_MASK, pszAbsPath, *pcbAbsPath);
+    if (RT_SUCCESS(rc))
+    {
+        if (pBaseParsed->fProps & RTPATH_PROP_VOLUME)
+            rtPathAbsExUpperCaseDriveLetter(pszAbsPath);
+
+        cchBaseInPlace = pBaseParsed->cchPath;
+        Assert(cchBaseInPlace == strlen(pszAbsPath));
+        if (iLast >= 0)
+        {
+            rc = RTPathParsedReassemble(pszPath, pParsed, fFlags & RTPATH_STR_F_STYLE_MASK,
+                                        &pszAbsPath[cchBaseInPlace], *pcbAbsPath - cchBaseInPlace);
+            if (RT_SUCCESS(rc))
+            {
+                *pcbAbsPath = cchBaseInPlace + pParsed->cchPath;
+                Assert(*pcbAbsPath == strlen(pszAbsPath));
+            }
+            else
+                *pcbAbsPath = cchBaseInPlace + pParsed->cchPath + 1;
+        }
+        else
+            *pcbAbsPath = cchBaseInPlace;
+    }
+    else if (rc == VERR_BUFFER_OVERFLOW)
+    {
+        if (iLast >= 0)
+        {
+            RTPathParsedReassemble(pszPath, pParsed, fFlags & RTPATH_STR_F_STYLE_MASK, pszAbsPath, 0);
+            *pcbAbsPath = pBaseParsed->cchPath + pParsed->cchPath + 1;
+        }
+        else
+            *pcbAbsPath = pBaseParsed->cchPath + 1;
+    }
+
+    return rc;
+}
+
+
+/**
+ * Handles the no-root-path scenario where we do CWD prefixing.
+ */
+static int rtPathAbsExWithCwd(const char *pszPath, PRTPATHPARSED pParsed, uint32_t fFlags, char *pszAbsPath, size_t *pcbAbsPath)
+{
+    /*
+     * Get the current directory and place it in the output buffer.
+     */
+    size_t cchInPlace;
+    size_t cbCwd      = *pcbAbsPath;
+    char  *pszCwdFree = NULL;
+    char  *pszCwd     = pszAbsPath;
+    int    rc;
+    if (   !(fFlags & RTPATH_STR_F_STYLE_DOS)
+        || (pParsed->fProps & (RTPATH_PROP_VOLUME | RTPATH_PROP_ROOT_SLASH)) != RTPATH_PROP_VOLUME )
+        rc = RTPathGetCurrent(pszCwd, cbCwd);
+    else
+        rc = RTPathGetCurrentOnDrive(pszPath[0], pszCwd, cbCwd);
+    if (RT_SUCCESS(rc))
+        cchInPlace = strlen(pszCwd);
+    else if (rc == VERR_BUFFER_OVERFLOW)
+    {
+        /* Allocate a big temporary buffer so we can return the correct length
+           (the destination buffer might even be big enough if pszPath includes
+           sufficient '..' entries). */
+        cchInPlace = 0;
+        cbCwd      = RT_MAX(cbCwd * 4, RTPATH_BIG_MAX);
+        pszCwdFree = pszCwd = (char *)RTMemTmpAlloc(cbCwd);
+        if (pszCwdFree)
+        {
+            if (   !(fFlags & RTPATH_STR_F_STYLE_DOS)
+                || (pParsed->fProps & (RTPATH_PROP_VOLUME | RTPATH_PROP_ROOT_SLASH)) != RTPATH_PROP_VOLUME )
+                rc = RTPathGetCurrent(pszCwd, cbCwd);
+            else
+                rc = RTPathGetCurrentOnDrive(pszPath[0], pszCwd, cbCwd);
+            if (RT_FAILURE(rc))
+            {
+                if (rc == VERR_BUFFER_OVERFLOW)
+                    rc = VERR_FILENAME_TOO_LONG;
+                RTMemTmpFree(pszCwdFree);
+                return rc;
+            }
+        }
+        else
+        {
+            *pcbAbsPath = cbCwd + 1 + pParsed->cchPath + 1;
+            return rc;
+        }
+    }
+    else
+        return rc;
+
+    /*
+     * Parse the path.
+     */
+    union
+    {
+        RTPATHPARSED Parsed;
+        uint8_t      abPadding[1024];
+    } uCwd;
+    PRTPATHPARSED pCwdParsedFree = NULL;
+    PRTPATHPARSED pCwdParsed     = &uCwd.Parsed;
+    size_t        cbCwdParsed    = sizeof(uCwd);
+    rc = RTPathParse(pszCwd, pCwdParsed, cbCwdParsed, fFlags & RTPATH_STR_F_STYLE_MASK);
+    if (RT_SUCCESS(rc))
+    { /* likely */ }
+    else if (rc == VERR_BUFFER_OVERFLOW)
+    {
+        cbCwdParsed = RT_UOFFSETOF_DYN(RTPATHPARSED, aComps[pCwdParsed->cComps + 2]);
+        pCwdParsedFree = pCwdParsed = (PRTPATHPARSED)RTMemTmpAlloc(cbCwdParsed);
+        AssertReturnStmt(pCwdParsed, RTMemTmpFree(pszCwdFree), VERR_NO_TMP_MEMORY);
+        rc = RTPathParse(pszCwd, pCwdParsed, cbCwdParsed, fFlags & RTPATH_STR_F_STYLE_MASK);
+        AssertRCReturnStmt(rc, RTMemTmpFree(pCwdParsedFree); RTMemTmpFree(pszCwdFree), rc);
+    }
+    else
+        AssertMsgFailedReturn(("rc=%Rrc '%s'\n", rc, pszPath), rc);
+
+    /*
+     * Join paths with the base-path code.
+     */
+    if (fFlags & RTPATHABS_F_STOP_AT_CWD)
+        fFlags |= RTPATHABS_F_STOP_AT_BASE;
+    else
+        fFlags &= ~RTPATHABS_F_STOP_AT_BASE;
+    rc = rtPathAbsExWithCwdOrBaseCommon(pszCwd, cchInPlace, pCwdParsed, pszPath, pParsed, fFlags, pszAbsPath, pcbAbsPath);
+    if (pCwdParsedFree)
+        RTMemTmpFree(pCwdParsedFree);
+    if (pszCwdFree)
+        RTMemTmpFree(pszCwdFree);
+    return rc;
+}
+
+
+/**
+ * Handles the no-root-path scenario where we've got a base path.
+ */
+static int rtPathAbsExWithBase(const char *pszBase, const char *pszPath, PRTPATHPARSED pParsed, uint32_t fFlags,
+                               char *pszAbsPath, size_t *pcbAbsPath)
+{
+    /*
+     * Parse the base path.
+     */
+    union
+    {
+        RTPATHPARSED Parsed;
+        uint8_t      abPadding[1024];
+    } uBase;
+    PRTPATHPARSED pBaseParsedFree = NULL;
+    PRTPATHPARSED pBaseParsed     = &uBase.Parsed;
+    size_t        cbBaseParsed    = sizeof(uBase);
+    int rc = RTPathParse(pszBase, pBaseParsed, cbBaseParsed, fFlags & RTPATH_STR_F_STYLE_MASK);
+    if (RT_SUCCESS(rc))
+    { /* likely */ }
+    else if (rc == VERR_BUFFER_OVERFLOW)
+    {
+        cbBaseParsed = RT_UOFFSETOF_DYN(RTPATHPARSED, aComps[pBaseParsed->cComps + 2]);
+        pBaseParsedFree = pBaseParsed = (PRTPATHPARSED)RTMemTmpAlloc(cbBaseParsed);
+        AssertReturn(pBaseParsed, VERR_NO_TMP_MEMORY);
+        rc = RTPathParse(pszBase, pBaseParsed, cbBaseParsed, fFlags & RTPATH_STR_F_STYLE_MASK);
+        AssertRCReturnStmt(rc, RTMemTmpFree(pBaseParsedFree), rc);
+    }
+    else
+        AssertMsgFailedReturn(("rc=%Rrc '%s'\n", rc, pszPath), rc);
+
+    /*
+     * If the base path isn't absolute, we need to deal with that.
+     */
+    size_t cchInPlace = 0;
+    if ((pBaseParsed->fProps & (RTPATH_PROP_ABSOLUTE | RTPATH_PROP_EXTRA_SLASHES | RTPATH_PROP_DOT_REFS)) == RTPATH_PROP_ABSOLUTE)
+    { /* likely */ }
+    else
+    {
+        cchInPlace = *pcbAbsPath;
+        rc = RTPathAbsEx(NULL, pszBase, fFlags, pszAbsPath, &cchInPlace);
+        if (RT_SUCCESS(rc))
+        {
+            Assert(strlen(pszAbsPath) == cchInPlace);
+            Assert(cchInPlace > 0);
+        }
+        else
+        {
+/** @todo Allocate temp buffer like we do for CWD? */
+            /* This is over generious, but don't want to put too much effort into it yet. */
+            if (rc == VERR_BUFFER_OVERFLOW)
+                *pcbAbsPath = cchInPlace + 1 + pParsed->cchPath + 1;
+            return rc;
+        }
+
+        /*
+         * Reparse it.
+         */
+        rc = RTPathParse(pszAbsPath, pBaseParsed, cbBaseParsed, fFlags & RTPATH_STR_F_STYLE_MASK);
+        if (RT_SUCCESS(rc))
+        { /* likely */ }
+        else if (rc == VERR_BUFFER_OVERFLOW)
+        {
+            if (pBaseParsedFree)
+                RTMemTmpFree(pBaseParsedFree);
+            cbBaseParsed = RT_UOFFSETOF_DYN(RTPATHPARSED, aComps[pBaseParsed->cComps + 2]);
+            pBaseParsedFree = pBaseParsed = (PRTPATHPARSED)RTMemTmpAlloc(cbBaseParsed);
+            AssertReturn(pBaseParsed, VERR_NO_TMP_MEMORY);
+            rc = RTPathParse(pszAbsPath, pBaseParsed, cbBaseParsed, fFlags & RTPATH_STR_F_STYLE_MASK);
+            AssertRCReturnStmt(rc, RTMemTmpFree(pBaseParsedFree), rc);
+        }
+        else
+            AssertMsgFailedReturn(("rc=%Rrc '%s'\n", rc, pszPath), rc);
+    }
+
+    /*
+     * Join paths with the CWD code.
+     */
+    rc = rtPathAbsExWithCwdOrBaseCommon(cchInPlace ? pszAbsPath : pszBase, cchInPlace, pBaseParsed,
+                                        pszPath, pParsed, fFlags, pszAbsPath, pcbAbsPath);
+    if (pBaseParsedFree)
+        RTMemTmpFree(pBaseParsedFree);
+    return rc;
+}
+
+
+/**
+ * Handles the RTPATH_PROP_ROOT_SLASH case.
+ */
+static int rtPathAbsExRootSlash(const char *pszBase, const char *pszPath, PRTPATHPARSED pParsed,
+                                uint32_t fFlags, char *pszAbsPath, size_t *pcbAbsPath)
+{
+    /*
+     * Eliminate dot and dot-dot components.
+     * Note! aComp[0] is the root stuff and must never be dropped.
+     */
+    uint32_t const cComps = pParsed->cComps;
+    uint32_t const iStop  = (pParsed->fProps & (RTPATH_PROP_UNC | RTPATH_PROP_SPECIAL_UNC)) != RTPATH_PROP_UNC
+                         || pParsed->cComps < 2 ? 0 : 1;
+    uint32_t       iLast  = iStop;
+    uint32_t       i      = iStop + 1;
+    while (i < cComps)
+    {
+        uint32_t const cchComp = pParsed->aComps[i].cch;
+        if (   cchComp > 2
+            || pszPath[pParsed->aComps[i].off] != '.'
+            || (cchComp == 2 && pszPath[pParsed->aComps[i].off + 1] != '.') )
+            iLast = i;
+        else
+        {
+            Assert(cchComp == 1 || cchComp == 2);
+            pParsed->aComps[i].cch = 0;
+            if (cchComp == 2)
+            {
+                while (iLast > iStop && pParsed->aComps[iLast].cch == 0)
+                    iLast--;
+                if (iLast > iStop)
+                {
+                    Assert(pParsed->aComps[iLast].cch > 0);
+                    pParsed->aComps[iLast].cch = 0;
+                    iLast--;
+                }
+            }
+        }
+        i++;
+    }
+
+    /*
+     * Before we continue, ensure trailing slash if requested.
+     */
+    if (   (fFlags & RTPATHABS_F_ENSURE_TRAILING_SLASH)
+        && iLast > 0)
+        pParsed->fProps |= RTPATH_PROP_DIR_SLASH;
+
+    /*
+     * DOS-style: Do we need to supply a drive letter or UNC root?
+     */
+    size_t cchRootPrefix = 0;
+    if (   (fFlags & RTPATH_STR_F_STYLE_DOS)
+        && !(pParsed->fProps & (RTPATH_PROP_VOLUME | RTPATH_PROP_UNC)) )
+    {
+        /* Use the drive/UNC from the base path if we have one and it has such a component: */
+        if (pszBase)
+        {
+            union
+            {
+                RTPATHPARSED    Parsed;
+                uint8_t         abPadding[sizeof(RTPATHPARSED) + sizeof(pParsed->aComps[0]) * 2];
+            } uBase;
+            int rc = RTPathParse(pszBase, &uBase.Parsed, sizeof(uBase), fFlags & RTPATH_STR_F_STYLE_MASK);
+            AssertMsgReturn(RT_SUCCESS(rc) || rc == VERR_BUFFER_OVERFLOW, ("%Rrc - '%s'\n", rc, pszBase), rc);
+
+            if (uBase.Parsed.fProps & RTPATH_PROP_VOLUME)
+            {
+                /* get the drive letter. */
+                Assert(uBase.Parsed.aComps[0].cch == 2 || uBase.Parsed.aComps[0].cch == 3);
+                cchRootPrefix = RT_MIN(uBase.Parsed.aComps[0].cch, 2);
+                if (cchRootPrefix < *pcbAbsPath)
+                    memcpy(pszAbsPath, &pszBase[uBase.Parsed.aComps[0].off], cchRootPrefix);
+                else
+                {
+                    rc = RTPathParsedReassemble(pszPath, pParsed, fFlags & RTPATH_STR_F_STYLE_MASK, pszAbsPath, 0);
+                    Assert(rc == VERR_BUFFER_OVERFLOW);
+
+                    *pcbAbsPath = cchRootPrefix + pParsed->cchPath + 1;
+                    return VERR_BUFFER_OVERFLOW;
+                }
+                rtPathAbsExUpperCaseDriveLetter(pszAbsPath);
+            }
+            else if (uBase.Parsed.fProps & RTPATH_PROP_UNC)
+            {
+                /* Include the share if we've got one. */
+                cchRootPrefix = uBase.Parsed.aComps[0].cch;
+                if (uBase.Parsed.cComps >= 2 && !(uBase.Parsed.fProps & RTPATH_PROP_SPECIAL_UNC))
+                    cchRootPrefix += uBase.Parsed.aComps[1].cch;
+                else if (uBase.Parsed.fProps & RTPATH_PROP_ROOT_SLASH)
+                    cchRootPrefix--;
+                if (cchRootPrefix < *pcbAbsPath)
+                {
+                    if (uBase.Parsed.cComps < 2 || (uBase.Parsed.fProps & RTPATH_PROP_SPECIAL_UNC))
+                        memcpy(pszAbsPath, &pszBase[uBase.Parsed.aComps[0].off], cchRootPrefix);
+                    else
+                    {
+                        size_t cchFirst = uBase.Parsed.aComps[0].cch;
+                        memcpy(pszAbsPath, &pszBase[uBase.Parsed.aComps[0].off], cchFirst);
+                        memcpy(&pszAbsPath[cchFirst], &pszBase[uBase.Parsed.aComps[1].off], uBase.Parsed.aComps[1].cch);
+                    }
+                }
+                else
+                {
+                    rc = RTPathParsedReassemble(pszPath, pParsed, fFlags & RTPATH_STR_F_STYLE_MASK, pszAbsPath, 0);
+                    Assert(rc == VERR_BUFFER_OVERFLOW);
+
+                    *pcbAbsPath = cchRootPrefix + pParsed->cchPath + 1;
+                    return VERR_BUFFER_OVERFLOW;
+                }
+            }
+            else
+                pszBase = NULL;
+        }
+
+        /* Otherwise, query the current drive: */
+        if (!pszBase)
+        {
+            int rc = RTPathGetCurrentDrive(pszAbsPath, *pcbAbsPath);
+            if (RT_SUCCESS(rc))
+                cchRootPrefix = strlen(pszAbsPath);
+            else
+            {
+                if (rc == VERR_BUFFER_OVERFLOW)
+                {
+                    int rc2 = RTPathParsedReassemble(pszPath, pParsed, fFlags & RTPATH_STR_F_STYLE_MASK, pszAbsPath, 0);
+                    Assert(rc2 == VERR_BUFFER_OVERFLOW);
+
+                    char *pszTmp = (char *)RTMemTmpAlloc(RTPATH_BIG_MAX);
+                    if (pszTmp)
+                    {
+                        rc2 = RTPathGetCurrentDrive(pszTmp, RTPATH_BIG_MAX);
+                        if (RT_SUCCESS(rc2))
+                            *pcbAbsPath = strlen(pszTmp) + pParsed->cchPath + 1;
+                        else
+                            *pcbAbsPath = RT_MAX(*pcbAbsPath * 2, (size_t)RTPATH_BIG_MAX * 3 + pParsed->cchPath + 1);
+                        RTMemTmpFree(pszTmp);
+                    }
+                    else
+                        rc = VERR_NO_TMP_MEMORY;
+                }
+                return rc;
+            }
+        }
+    }
+
+    /*
+     * Reassemble the path and return.
+     */
+    int rc = RTPathParsedReassemble(pszPath, pParsed, fFlags & RTPATH_STR_F_STYLE_MASK,
+                                    pszAbsPath + cchRootPrefix, *pcbAbsPath - cchRootPrefix);
+    *pcbAbsPath = cchRootPrefix + pParsed->cchPath + (rc == VERR_BUFFER_OVERFLOW);
+    return rc;
+}
+
+
+/**
+ * Handles the RTPATH_PROP_ABSOLUTE case.
+ */
+static int rtPathAbsExAbsolute(const char *pszPath, PRTPATHPARSED pParsed, uint32_t fFlags, char *pszAbsPath, size_t *pcbAbsPath)
+{
+    if (pParsed->fProps & RTPATH_PROP_DOT_REFS)
+    {
+        uint32_t i = pParsed->cComps;
+        while (i-- > 0)
+            if (   pParsed->aComps[i].cch == 1
+                && pszPath[pParsed->aComps[i].off] == '.')
+                pParsed->aComps[i].cch = 0;
+    }
+
+    if (   (fFlags & RTPATHABS_F_ENSURE_TRAILING_SLASH)
+        && pParsed->cComps > 1)
+        pParsed->fProps |= RTPATH_PROP_DIR_SLASH;
+
+    int rc = RTPathParsedReassemble(pszPath, pParsed, fFlags & RTPATH_STR_F_STYLE_MASK, pszAbsPath, *pcbAbsPath);
+    *pcbAbsPath = pParsed->cchPath + (rc == VERR_BUFFER_OVERFLOW);
+    if (RT_SUCCESS(rc) && (pParsed->fProps & RTPATH_PROP_VOLUME))
+        rtPathAbsExUpperCaseDriveLetter(pszAbsPath);
+    return rc;
+}
+
+
+RTDECL(int) RTPathAbsEx(const char *pszBase, const char *pszPath, uint32_t fFlags, char *pszAbsPath, size_t *pcbAbsPath)
+{
+    LogFlow(("RTPathAbsEx: pszBase=%s pszPath=%s fFlags=%#x\n", pszBase, pszPath, fFlags));
+
+    /*
+     * Some input validation.
+     */
+    AssertPtr(pszPath);
+    AssertPtr(pszAbsPath);
+    AssertPtr(pcbAbsPath);
+    AssertReturn(*pszPath != '\0', VERR_PATH_ZERO_LENGTH);
+
+    AssertCompile(RTPATH_STR_F_STYLE_HOST == 0);
+    AssertReturn(   RTPATH_STR_F_IS_VALID(fFlags, RTPATHABS_F_STOP_AT_BASE | RTPATHABS_F_STOP_AT_CWD | RTPATHABS_F_ENSURE_TRAILING_SLASH)
+                 && !(fFlags & RTPATH_STR_F_MIDDLE), VERR_INVALID_FLAGS);
+    if ((fFlags & RTPATH_STR_F_STYLE_MASK) == RTPATH_STR_F_STYLE_HOST)
+        fFlags |= RTPATH_STYLE;
+
+    /*
+     * Parse the path we're to straigthen out.
+     */
+    union
+    {
+        RTPATHPARSED Parsed;
+        uint8_t      abPadding[1024];
+    } uBuf;
+    PRTPATHPARSED pParsedFree = NULL;
+    PRTPATHPARSED pParsed     = &uBuf.Parsed;
+    size_t        cbParsed    = sizeof(uBuf);
+    int rc = RTPathParse(pszPath, pParsed, cbParsed, fFlags & RTPATH_STR_F_STYLE_MASK);
+    if (RT_SUCCESS(rc))
+    { /* likely */ }
+    else if (rc == VERR_BUFFER_OVERFLOW)
+    {
+        cbParsed = RT_UOFFSETOF_DYN(RTPATHPARSED, aComps[pParsed->cComps + 2]);
+        pParsedFree = pParsed = (PRTPATHPARSED)RTMemTmpAlloc(cbParsed);
+        AssertReturn(pParsed, VERR_NO_TMP_MEMORY);
+        rc = RTPathParse(pszPath, pParsed, cbParsed, fFlags & RTPATH_STR_F_STYLE_MASK);
+        AssertRCReturnStmt(rc, RTMemTmpFree(pParsedFree), rc);
+    }
+    else
+        AssertMsgFailedReturn(("rc=%Rrc '%s'\n", rc, pszPath), rc);
+
+    /*
+     * Check if the input is more or less perfect as it is.
+     */
+    if (pParsed->fProps & RTPATH_PROP_ABSOLUTE)
+        rc = rtPathAbsExAbsolute(pszPath, pParsed, fFlags, pszAbsPath, pcbAbsPath);
+    /*
+     * What about relative but with a root slash.
+     */
+    else if (pParsed->fProps & RTPATH_PROP_ROOT_SLASH)
+        rc = rtPathAbsExRootSlash(pszBase, pszPath, pParsed, fFlags, pszAbsPath, pcbAbsPath);
+    /*
+     * Not exactly perfect.  No root slash.
+     *
+     * If we have a base path, we use it unless we're into drive letters and
+     * pszPath refers to a different drive letter.
+     */
+    else if (   pszBase
+             && (   !(fFlags & RTPATH_STR_F_STYLE_DOS)
+                 /** @todo add flag for skipping this and always using the base path? */
+                 || !(pParsed->fProps & RTPATH_PROP_VOLUME)
+                 || (   RT_C_IS_ALPHA(pszBase[0])
+                     && pszBase[1] == ':'
+                     && RT_C_TO_UPPER(pszBase[0]) == RT_C_TO_UPPER(pszPath[0])
+                    )
+                )
+            )
+        rc = rtPathAbsExWithBase(pszBase, pszPath, pParsed, fFlags, pszAbsPath, pcbAbsPath);
+    else
+        rc = rtPathAbsExWithCwd(pszPath, pParsed, fFlags, pszAbsPath, pcbAbsPath);
+
+    if (pParsedFree)
+        RTMemTmpFree(pParsedFree);
+    LogFlow(("RTPathAbsEx: returns %Rrc *pcbAbsPath=%#zx\n", rc, *pcbAbsPath));
+    return rc;
+}
+
+
+RTDECL(int) RTPathAbs(const char *pszPath, char *pszAbsPath, size_t cbAbsPath)
+{
+    return RTPathAbsEx(NULL, pszPath, RTPATH_STR_F_STYLE_HOST, pszAbsPath, &cbAbsPath);
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathAbsExDup.cpp b/src/VBox/Runtime/common/path/RTPathAbsExDup.cpp
new file mode 100644
index 00000000..d44b65be
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathAbsExDup.cpp
@@ -0,0 +1,82 @@
+/* $Id: RTPathAbsExDup.cpp $ */
+/** @file
+ * IPRT - RTPathAbsExDup
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+#include <iprt/errcore.h>
+#include <iprt/param.h>
+#include <iprt/string.h>
+
+
+
+RTDECL(char *) RTPathAbsExDup(const char *pszBase, const char *pszPath, uint32_t fFlags)
+{
+    unsigned    cTries    = 16;
+    size_t      cbAbsPath = RTPATH_MAX / 2;
+    for (;;)
+    {
+        char  *pszAbsPath = RTStrAlloc(cbAbsPath);
+        if (pszAbsPath)
+        {
+            size_t cbActual = cbAbsPath;
+            int rc = RTPathAbsEx(pszBase, pszPath, fFlags, pszAbsPath, &cbActual);
+            if (RT_SUCCESS(rc))
+            {
+                if (cbActual < cbAbsPath / 2)
+                    RTStrRealloc(&pszAbsPath, cbActual + 1);
+                return pszAbsPath;
+            }
+
+            RTStrFree(pszAbsPath);
+
+            if (rc != VERR_BUFFER_OVERFLOW)
+                break;
+
+            if (--cTries == 0)
+                break;
+
+            cbAbsPath = RT_MAX(RT_ALIGN_Z(cbActual + 16, 64), cbAbsPath + 256);
+        }
+        else
+            break;
+    }
+    return NULL;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathAppend.cpp b/src/VBox/Runtime/common/path/RTPathAppend.cpp
new file mode 100644
index 00000000..26961e99
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathAppend.cpp
@@ -0,0 +1,51 @@
+/* $Id: RTPathAppend.cpp $ */
+/** @file
+ * IPRT - RTPathAppend
+ */
+
+/*
+ * Copyright (C) 2009-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/string.h>
+
+
+RTDECL(int) RTPathAppend(char *pszPath, size_t cbPathDst, const char *pszAppend)
+{
+    return RTPathAppendEx(pszPath, cbPathDst, pszAppend, RTSTR_MAX, RTPATH_STR_F_STYLE_HOST);
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathAppendEx.cpp b/src/VBox/Runtime/common/path/RTPathAppendEx.cpp
new file mode 100644
index 00000000..a6208232
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathAppendEx.cpp
@@ -0,0 +1,97 @@
+/* $Id: RTPathAppendEx.cpp $ */
+/** @file
+ * IPRT - RTPathAppendEx
+ */
+
+/*
+ * Copyright (C) 2009-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include <iprt/ctype.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+
+#define RTPATH_TEMPLATE_CPP_H "RTPathAppendEx.cpp.h"
+#include "rtpath-expand-template.cpp.h"
+
+
+RTDECL(int) RTPathAppendEx(char *pszPath, size_t cbPathDst, const char *pszAppend, size_t cchAppendMax, uint32_t fFlags)
+{
+    char *pszPathEnd = RTStrEnd(pszPath, cbPathDst);
+    AssertReturn(pszPathEnd, VERR_INVALID_PARAMETER);
+    Assert(RTPATH_STR_F_IS_VALID(fFlags, 0));
+
+    /*
+     * 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;
+    }
+
+    /*
+     * Go to path style specific code now.
+     */
+    switch (fFlags & RTPATH_STR_F_STYLE_MASK)
+    {
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+        case RTPATH_STR_F_STYLE_HOST:
+#endif
+        case RTPATH_STR_F_STYLE_DOS:
+            return rtPathAppendExStyleDos(pszPath, cbPathDst, pszPathEnd, pszAppend, cchAppend);
+
+#if RTPATH_STYLE != RTPATH_STR_F_STYLE_DOS
+        case RTPATH_STR_F_STYLE_HOST:
+#endif
+        case RTPATH_STR_F_STYLE_UNIX:
+            return rtPathAppendExStyleUnix(pszPath, cbPathDst, pszPathEnd, pszAppend, cchAppend);
+
+        default:
+            AssertFailedReturn(VERR_INVALID_FLAGS); /* impossible */
+    }
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathAppendEx.cpp.h b/src/VBox/Runtime/common/path/RTPathAppendEx.cpp.h
new file mode 100644
index 00000000..1633a75c
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathAppendEx.cpp.h
@@ -0,0 +1,166 @@
+/* $Id: RTPathAppendEx.cpp.h $ */
+/** @file
+ * IPRT - rtPathAppendEx - Code Template.
+ */
+
+/*
+ * Copyright (C) 2009-2022 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;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathCalcRelative.cpp b/src/VBox/Runtime/common/path/RTPathCalcRelative.cpp
new file mode 100644
index 00000000..a24f1607
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathCalcRelative.cpp
@@ -0,0 +1,248 @@
+/* $Id: RTPathCalcRelative.cpp $ */
+/** @file
+ * IPRT - RTPathCreateRelative.
+ */
+
+/*
+ * Copyright (C) 2013-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+# include <iprt/uni.h>
+#endif
+#include "internal/path.h"
+
+
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+/** Helper for doing case insensitive comparison of a mismatching codepoint. */
+DECLINLINE(bool) rtPathCalcRelativeEqualICaseCodepoint(const char *pszPathFromStart, const char *pszPathFrom,
+                                                       const char *pszPathToStart,   const char *pszPathTo)
+{
+    RTUNICP ucFrom = RTStrGetCp(RTStrPrevCp(pszPathFromStart, pszPathFrom));
+    RTUNICP ucTo   = RTStrGetCp(RTStrPrevCp(pszPathToStart,   pszPathTo));
+    return ucFrom == ucTo
+        || RTUniCpToLower(ucFrom) == RTUniCpToLower(ucTo)
+        || RTUniCpToUpper(ucFrom) == RTUniCpToUpper(ucTo);
+}
+#endif
+
+
+RTDECL(int) RTPathCalcRelative(char *pszPathDst, size_t cbPathDst,
+                               const char *pszPathFrom, bool fFromFile,
+                               const char *pszPathTo)
+{
+    AssertPtrReturn(pszPathDst, VERR_INVALID_POINTER);
+    AssertReturn(cbPathDst, VERR_INVALID_PARAMETER);
+    AssertPtrReturn(pszPathFrom, VERR_INVALID_POINTER);
+    AssertPtrReturn(pszPathTo, VERR_INVALID_POINTER);
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+    const char * const pszPathFromStart = pszPathFrom;
+    const char * const pszPathToStart   = pszPathTo;
+#endif
+
+    /*
+     * Check for different root specifiers (drive letters), creating a relative path doesn't work here.
+     */
+    size_t offRootFrom = rtPathRootSpecLen(pszPathFrom);
+    AssertReturn(offRootFrom > 0, VERR_INVALID_PARAMETER);
+
+    size_t offRootTo   = rtPathRootSpecLen(pszPathTo);
+    AssertReturn(offRootTo > 0, VERR_INVALID_PARAMETER);
+
+
+    /** @todo correctly deal with extra root slashes! */
+    if (offRootFrom != offRootTo)
+        return VERR_NOT_SUPPORTED;
+
+#if RTPATH_STYLE != RTPATH_STR_F_STYLE_DOS
+    if (RTStrNCmp(pszPathFrom, pszPathTo, offRootFrom))
+        return VERR_NOT_SUPPORTED;
+#else
+    if (RTStrNICmp(pszPathFrom, pszPathTo, offRootFrom))
+    {
+        const char *pszFromCursor = pszPathFrom;
+        const char *pszToCursor   = pszPathTo;
+        while ((size_t)(pszFromCursor - pszPathFrom) < offRootFrom)
+        {
+            RTUNICP ucFrom;
+            int rc = RTStrGetCpEx(&pszFromCursor, &ucFrom);
+            AssertRCReturn(rc, rc);
+
+            RTUNICP ucTo;
+            rc = RTStrGetCpEx(&pszToCursor, &ucTo);
+            AssertRCReturn(rc, rc);
+            if (   ucFrom != ucTo
+                && RTUniCpToLower(ucFrom) != RTUniCpToLower(ucTo)
+                && RTUniCpToUpper(ucFrom) != RTUniCpToUpper(ucTo)
+                && (!RTPATH_IS_SLASH(ucFrom) || !RTPATH_IS_SLASH(ucTo)) )
+                return VERR_NOT_SUPPORTED;
+        }
+    }
+#endif
+
+    pszPathFrom += offRootFrom;
+    pszPathTo   += offRootTo;
+
+    /*
+     * Skip out the part of the path which is equal to both.
+     */
+    const char *pszStartOfFromComp = pszPathFrom;
+    for (;;)
+    {
+        char const chFrom = *pszPathFrom;
+        char const chTo   = *pszPathTo;
+        if (!RTPATH_IS_SLASH(chFrom))
+        {
+            if (chFrom == chTo)
+            {
+                if (chFrom)
+                { /* likely */ }
+                else
+                {
+                    /* Special case: The two paths are equal. */
+                    if (fFromFile)
+                    {
+                        size_t cchComp = pszPathFrom - pszStartOfFromComp;
+                        if (cchComp < cbPathDst)
+                        {
+                            memcpy(pszPathDst, pszStartOfFromComp, cchComp);
+                            pszPathDst[cchComp] = '\0';
+                            return VINF_SUCCESS;
+                        }
+                    }
+                    else if (sizeof(".") <= cbPathDst)
+                    {
+                        memcpy(pszPathDst, ".", sizeof("."));
+                        return VINF_SUCCESS;
+                    }
+                    return VERR_BUFFER_OVERFLOW;
+                }
+            }
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+            else if (rtPathCalcRelativeEqualICaseCodepoint(pszPathFromStart, pszPathFrom + 1, pszPathToStart, pszPathTo + 1))
+            { /* if not likely, then simpler code structure wise. */ }
+#endif
+            else if (chFrom != '\0' || !RTPATH_IS_SLASH(chTo) || fFromFile)
+                break;
+            else
+            {
+                pszStartOfFromComp = pszPathFrom;
+                do
+                    pszPathTo++;
+                while (RTPATH_IS_SLASH(*pszPathTo));
+                break;
+            }
+            pszPathFrom++;
+            pszPathTo++;
+        }
+        else if (RTPATH_IS_SLASH(chTo))
+        {
+            /* Both have slashes.  Skip any additional ones before taking down
+               the start of the component for rewinding purposes. */
+            do
+                pszPathTo++;
+            while (RTPATH_IS_SLASH(*pszPathTo));
+            do
+                pszPathFrom++;
+            while (RTPATH_IS_SLASH(*pszPathFrom));
+            pszStartOfFromComp = pszPathFrom;
+        }
+        else
+            break;
+    }
+
+    /* Rewind to the start of the current component. */
+    pszPathTo  -= pszPathFrom - pszStartOfFromComp;
+    pszPathFrom = pszStartOfFromComp;
+
+    /* Paths point to the first non equal component now. */
+
+    /*
+     * Constructure the relative path.
+     */
+
+    /* Create the part to go up from pszPathFrom. */
+    unsigned offDst = 0;
+
+    if (!fFromFile && *pszPathFrom != '\0')
+    {
+        if (offDst + 3 < cbPathDst)
+        {
+            pszPathDst[offDst++] = '.';
+            pszPathDst[offDst++] = '.';
+            pszPathDst[offDst++] = RTPATH_SLASH;
+        }
+        else
+            return VERR_BUFFER_OVERFLOW;
+    }
+
+    while (*pszPathFrom != '\0')
+    {
+        char ch;
+        while (   (ch = *pszPathFrom) != '\0'
+               && !RTPATH_IS_SLASH(*pszPathFrom))
+            pszPathFrom++;
+        while (   (ch = *pszPathFrom) != '\0'
+               && RTPATH_IS_SLASH(ch))
+            pszPathFrom++;
+        if (!ch)
+            break;
+
+        if (offDst + 3 < cbPathDst)
+        {
+            pszPathDst[offDst++] = '.';
+            pszPathDst[offDst++] = '.';
+            pszPathDst[offDst++] = RTPATH_SLASH;
+        }
+        else
+            return VERR_BUFFER_OVERFLOW;
+    }
+
+    /* Now append the rest of pszPathTo to the final path. */
+    size_t cchTo = strlen(pszPathTo);
+    if (offDst + cchTo <= cbPathDst)
+    {
+        memcpy(&pszPathDst[offDst], pszPathTo, cchTo);
+        pszPathDst[offDst + cchTo] = '\0';
+        return VINF_SUCCESS;
+    }
+    return VERR_BUFFER_OVERFLOW;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathChangeToDosSlashes.cpp b/src/VBox/Runtime/common/path/RTPathChangeToDosSlashes.cpp
new file mode 100644
index 00000000..7c72d36e
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathChangeToDosSlashes.cpp
@@ -0,0 +1,74 @@
+/* $Id: RTPathChangeToDosSlashes.cpp $ */
+/** @file
+ * IPRT - RTPathChangeToDosSlashes
+ */
+
+/*
+ * Copyright (C) 2010-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+
+/**
+ * Changes all the slashes in the specified path to DOS style.
+ *
+ * Unless @a fForce is set, nothing will be done when on a UNIX flavored system
+ * since paths wont work with DOS style slashes there.
+ *
+ * @returns @a pszPath.
+ * @param   pszPath             The path to modify.
+ * @param   fForce              Whether to force the conversion on non-DOS OSes.
+ */
+RTDECL(char *) RTPathChangeToDosSlashes(char *pszPath, bool fForce)
+{
+#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
+    RT_NOREF_PV(fForce);
+#else
+    if (fForce)
+#endif
+    {
+        char    ch;
+        char   *psz = pszPath;
+        while ((ch = *psz) != '\0')
+        {
+            if (ch == '/')
+                *psz = '\\';
+            psz++;
+        }
+    }
+    return pszPath;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathChangeToUnixSlashes.cpp b/src/VBox/Runtime/common/path/RTPathChangeToUnixSlashes.cpp
new file mode 100644
index 00000000..8d119ada
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathChangeToUnixSlashes.cpp
@@ -0,0 +1,74 @@
+/* $Id: RTPathChangeToUnixSlashes.cpp $ */
+/** @file
+ * IPRT - RTPathChangeToUnixSlashes
+ */
+
+/*
+ * Copyright (C) 2010-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+
+/**
+ * Changes all the slashes in the specified path to unix style.
+ *
+ * Unless @a fForce is set, nothing will be done when on a UNIX flavored system
+ * since paths wont work with DOS style slashes there.
+ *
+ * @returns @a pszPath.
+ * @param   pszPath             The path to modify.
+ * @param   fForce              Whether to force the conversion on non-DOS OSes.
+ */
+RTDECL(char *) RTPathChangeToUnixSlashes(char *pszPath, bool fForce)
+{
+#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
+    RT_NOREF_PV(fForce);
+#else
+    if (fForce)
+#endif
+    {
+        char    ch;
+        char   *psz = pszPath;
+        while ((ch = *psz) != '\0')
+        {
+            if (ch == '\\')
+                *psz = '/';
+            psz++;
+        }
+    }
+    return pszPath;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathCopyComponents.cpp b/src/VBox/Runtime/common/path/RTPathCopyComponents.cpp
new file mode 100644
index 00000000..0e0ea306
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathCopyComponents.cpp
@@ -0,0 +1,94 @@
+/* $Id: RTPathCopyComponents.cpp $ */
+/** @file
+ * IPRT - RTPathCountComponents
+ */
+
+/*
+ * Copyright (C) 2010-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+#include "internal/path.h"
+
+
+RTDECL(int) RTPathCopyComponents(char *pszDst, size_t cbDst, const char *pszSrc, size_t cComponents)
+{
+    /*
+     * Quick input validation.
+     */
+    AssertPtr(pszDst);
+    AssertPtr(pszSrc);
+    if (cbDst == 0)
+        return VERR_BUFFER_OVERFLOW;
+
+    /*
+     * Fend of the simple case where nothing is wanted.
+     */
+    if (cComponents == 0)
+    {
+        *pszDst = '\0';
+        return VINF_SUCCESS;
+    }
+
+    /*
+     * Parse into the path until we've counted the desired number of objects
+     * or hit the end.
+     */
+    size_t off = rtPathRootSpecLen(pszSrc);
+    size_t c   = off != 0;
+    while (c < cComponents && pszSrc[off])
+    {
+        c++;
+        while (!RTPATH_IS_SLASH(pszSrc[off]) && pszSrc[off])
+            off++;
+        while (RTPATH_IS_SLASH(pszSrc[off]))
+            off++;
+    }
+
+    /*
+     * Copy up to but not including 'off'.
+     */
+    if (off >= cbDst)
+        return VERR_BUFFER_OVERFLOW;
+
+    memcpy(pszDst, pszSrc, off);
+    pszDst[off] = '\0';
+    return VINF_SUCCESS;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathCountComponents.cpp b/src/VBox/Runtime/common/path/RTPathCountComponents.cpp
new file mode 100644
index 00000000..7652fbe1
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathCountComponents.cpp
@@ -0,0 +1,62 @@
+/* $Id: RTPathCountComponents.cpp $ */
+/** @file
+ * IPRT - RTPathCountComponents
+ */
+
+/*
+ * Copyright (C) 2010-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include "internal/path.h"
+
+
+RTDECL(size_t) RTPathCountComponents(const char *pszPath)
+{
+    size_t off = rtPathRootSpecLen(pszPath);
+    size_t c   = off != 0;
+    while (pszPath[off])
+    {
+        c++;
+        while (!RTPATH_IS_SLASH(pszPath[off]) && pszPath[off])
+            off++;
+        while (RTPATH_IS_SLASH(pszPath[off]))
+            off++;
+    }
+    return c;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathEnsureTrailingSeparator.cpp b/src/VBox/Runtime/common/path/RTPathEnsureTrailingSeparator.cpp
new file mode 100644
index 00000000..8b007438
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathEnsureTrailingSeparator.cpp
@@ -0,0 +1,108 @@
+/* $Id: RTPathEnsureTrailingSeparator.cpp $ */
+/** @file
+ * IPRT - RTPathEnsureTrailingSeparator & RTPathEnsureTrailingSeparatorEx
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include <iprt/ctype.h>
+#include <iprt/string.h>
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** Slash character indexed by path style. */
+static char g_achSlashes[] =
+{
+    /*[RTPATH_STR_F_STYLE_HOST] =*/     RTPATH_SLASH,
+    /*[RTPATH_STR_F_STYLE_DOS] =*/      '\\',
+    /*[RTPATH_STR_F_STYLE_UNIX] =*/     '/',
+    /*[RTPATH_STR_F_STYLE_RESERVED] =*/ '!',
+};
+AssertCompile(RTPATH_STR_F_STYLE_HOST == 0);
+AssertCompile(RTPATH_STR_F_STYLE_DOS  == 1);
+AssertCompile(RTPATH_STR_F_STYLE_UNIX == 2);
+
+
+RTDECL(size_t) RTPathEnsureTrailingSeparatorEx(char *pszPath, size_t cbPath, uint32_t fFlags)
+{
+    Assert(RTPATH_STR_F_IS_VALID(fFlags, 0));
+
+    size_t off = strlen(pszPath);
+    if (off > 0)
+    {
+        char ch = pszPath[off - 1];
+        if (ch == '/')
+            return off;
+        if (   (ch == ':' || ch == '\\')
+            && (   (fFlags & RTPATH_STR_F_STYLE_MASK) == RTPATH_STR_F_STYLE_DOS
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+                || (fFlags & RTPATH_STR_F_STYLE_MASK) == RTPATH_STR_F_STYLE_HOST
+#endif
+               ))
+            return off;
+
+        if (off + 2 <= cbPath)
+        {
+            pszPath[off++] = g_achSlashes[fFlags & RTPATH_STR_F_STYLE_MASK];
+            pszPath[off]   = '\0';
+            return off;
+        }
+    }
+    else if (off + 3 <= cbPath)
+    {
+        pszPath[off++] = '.';
+        pszPath[off++] =  g_achSlashes[fFlags & RTPATH_STR_F_STYLE_MASK];
+        pszPath[off]   = '\0';
+        return off;
+    }
+
+    return 0;
+}
+RT_EXPORT_SYMBOL(RTPathEnsureTrailingSeparatorEx);
+
+
+RTDECL(size_t) RTPathEnsureTrailingSeparator(char *pszPath, size_t cbPath)
+{
+    return RTPathEnsureTrailingSeparatorEx(pszPath, cbPath, RTPATH_STR_F_STYLE_HOST);
+}
+RT_EXPORT_SYMBOL(RTPathEnsureTrailingSeparator);
+
diff --git a/src/VBox/Runtime/common/path/RTPathExt.cpp b/src/VBox/Runtime/common/path/RTPathExt.cpp
new file mode 100644
index 00000000..9caa9aef
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathExt.cpp
@@ -0,0 +1,79 @@
+/* $Id: RTPathExt.cpp $ */
+/** @file
+ * IPRT - RTPathExt
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+
+RTDECL(char *) RTPathSuffix(const char *pszPath)
+{
+    const char *psz = pszPath;
+    const char *pszExt = NULL;
+
+    for (;; psz++)
+    {
+        switch (*psz)
+        {
+            /* handle separators. */
+#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
+            case ':':
+                pszExt = NULL;
+                break;
+
+            case '\\':
+#endif
+            case '/':
+                pszExt = NULL;
+                break;
+            case '.':
+                pszExt = psz;
+                break;
+
+            /* the end */
+            case '\0':
+                if (pszExt && pszExt != pszPath && pszExt[1])
+                    return (char *)(void *)pszExt;
+                return NULL;
+        }
+    }
+
+    /* not reached */
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathFilename.cpp b/src/VBox/Runtime/common/path/RTPathFilename.cpp
new file mode 100644
index 00000000..96570435
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathFilename.cpp
@@ -0,0 +1,109 @@
+/* $Id: RTPathFilename.cpp $ */
+/** @file
+ * IPRT - RTPathFilename
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+
+
+
+RTDECL(char *) RTPathFilename(const char *pszPath)
+{
+    return RTPathFilenameEx(pszPath, RTPATH_STYLE);
+}
+RT_EXPORT_SYMBOL(RTPathFilename);
+
+
+RTDECL(char *) RTPathFilenameEx(const char *pszPath, uint32_t fFlags)
+{
+    const char *psz = pszPath;
+    const char *pszName = pszPath;
+
+    Assert(RTPATH_STR_F_IS_VALID(fFlags, 0 /*no extra flags*/));
+    fFlags &= RTPATH_STR_F_STYLE_MASK;
+    if (fFlags == RTPATH_STR_F_STYLE_HOST)
+        fFlags = RTPATH_STYLE;
+    if (fFlags == RTPATH_STR_F_STYLE_DOS)
+    {
+        for (;; psz++)
+        {
+            switch (*psz)
+            {
+                /* handle separators. */
+                case ':':
+                case '\\':
+                case '/':
+                    pszName = psz + 1;
+                    break;
+
+                /* the end */
+                case '\0':
+                    if (*pszName)
+                        return (char *)(void *)pszName;
+                    return NULL;
+            }
+        }
+    }
+    else
+    {
+        Assert(fFlags == RTPATH_STR_F_STYLE_UNIX);
+        for (;; psz++)
+        {
+            switch (*psz)
+            {
+                /* handle separators. */
+                case '/':
+                    pszName = psz + 1;
+                    break;
+
+                /* the end */
+                case '\0':
+                    if (*pszName)
+                        return (char *)(void *)pszName;
+                    return NULL;
+            }
+        }
+    }
+
+    /* not reached */
+}
+RT_EXPORT_SYMBOL(RTPathFilenameEx);
+
diff --git a/src/VBox/Runtime/common/path/RTPathFilenameUtf16.cpp b/src/VBox/Runtime/common/path/RTPathFilenameUtf16.cpp
new file mode 100644
index 00000000..ab7935e7
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathFilenameUtf16.cpp
@@ -0,0 +1,109 @@
+/* $Id: RTPathFilenameUtf16.cpp $ */
+/** @file
+ * IPRT - RTPathFilenameUtf16
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+
+
+
+RTDECL(PRTUTF16) RTPathFilenameUtf16(PCRTUTF16 pwszPath)
+{
+    return RTPathFilenameExUtf16(pwszPath, RTPATH_STYLE);
+}
+RT_EXPORT_SYMBOL(RTPathFilenameUtf16);
+
+
+RTDECL(PRTUTF16) RTPathFilenameExUtf16(PCRTUTF16 pwszPath, uint32_t fFlags)
+{
+    PCRTUTF16 pwsz = pwszPath;
+    PCRTUTF16 pwszName = pwszPath;
+
+    Assert(RTPATH_STR_F_IS_VALID(fFlags, 0 /*no extra flags*/));
+    fFlags &= RTPATH_STR_F_STYLE_MASK;
+    if (fFlags == RTPATH_STR_F_STYLE_HOST)
+        fFlags = RTPATH_STYLE;
+    if (fFlags == RTPATH_STR_F_STYLE_DOS)
+    {
+        for (;; pwsz++)
+        {
+            switch (*pwsz)
+            {
+                /* handle separators. */
+                case ':':
+                case '\\':
+                case '/':
+                    pwszName = pwsz + 1;
+                    break;
+
+                /* the end */
+                case '\0':
+                    if (*pwszName)
+                        return (PRTUTF16)(void *)pwszName;
+                    return NULL;
+            }
+        }
+    }
+    else
+    {
+        Assert(fFlags == RTPATH_STR_F_STYLE_UNIX);
+        for (;; pwsz++)
+        {
+            switch (*pwsz)
+            {
+                /* handle separators. */
+                case '/':
+                    pwszName = pwsz + 1;
+                    break;
+
+                /* the end */
+                case '\0':
+                    if (*pwszName)
+                        return (PRTUTF16)(void *)pwszName;
+                    return NULL;
+            }
+        }
+    }
+
+    /* not reached */
+}
+RT_EXPORT_SYMBOL(RTPathFilenameExUtf16);
+
diff --git a/src/VBox/Runtime/common/path/RTPathFindCommon.cpp b/src/VBox/Runtime/common/path/RTPathFindCommon.cpp
new file mode 100644
index 00000000..ddf3f6fc
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathFindCommon.cpp
@@ -0,0 +1,127 @@
+/* $Id: RTPathFindCommon.cpp $ */
+/** @file
+ * IPRT - RTPathFindCommon implementations.
+ */
+
+/*
+ * Copyright (C) 2020-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/alloca.h>
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+#include <iprt/uni.h>
+
+
+#define RTPATH_TEMPLATE_CPP_H "RTPathFindCommon.cpp.h"
+#include "rtpath-expand-template.cpp.h"
+
+
+RTDECL(size_t) RTPathFindCommonEx(size_t cPaths, const char * const *papszPaths, uint32_t fFlags)
+{
+    /*
+     * Validate input.
+     */
+    AssertReturn(RTPATH_STR_F_IS_VALID(fFlags, RTPATHFINDCOMMON_F_IGNORE_DOTDOT), 0);
+    AssertReturn(cPaths > 0, 0);
+    AssertPtrReturn(papszPaths, 0);
+    size_t i = cPaths;
+    while (i-- > 0)
+        AssertPtrReturn(papszPaths[i], 0);
+
+    /*
+     * Duplicate papszPaths so we can have individual positions in each path.
+     * Use the stack if we haven't got too many paths.
+     */
+    void        *pvFree;
+    const char **papszCopy;
+    size_t      cbNeeded = cPaths * sizeof(papszCopy[0]);
+    if (cbNeeded <= _2K)
+    {
+        pvFree = NULL;
+        papszCopy = (const char **)alloca(cbNeeded);
+    }
+    else
+    {
+        pvFree = RTMemTmpAlloc(cbNeeded);
+        papszCopy = (const char **)pvFree;
+    }
+    AssertReturn(papszCopy, 0);
+    memcpy(papszCopy, papszPaths, cbNeeded);
+
+    /*
+     * Invoke the worker for the selected path style.
+     */
+    size_t cchRet;
+    switch (fFlags & RTPATH_STR_F_STYLE_MASK)
+    {
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+        case RTPATH_STR_F_STYLE_HOST:
+#endif
+        case RTPATH_STR_F_STYLE_DOS:
+            cchRet= rtPathFindCommonStyleDos(cPaths, papszCopy, fFlags);
+            break;
+
+#if RTPATH_STYLE != RTPATH_STR_F_STYLE_DOS
+        case RTPATH_STR_F_STYLE_HOST:
+#endif
+        case RTPATH_STR_F_STYLE_UNIX:
+            cchRet = rtPathFindCommonStyleUnix(cPaths, papszCopy, fFlags);
+            break;
+
+        default:
+            AssertFailedStmt(cchRet = 0); /* impossible */
+    }
+
+    /*
+     * Clean up and return.
+     */
+    if (pvFree)
+        RTMemTmpFree(pvFree);
+    return cchRet;
+}
+RT_EXPORT_SYMBOL(RTPathFindCommonEx);
+
+
+RTDECL(size_t) RTPathFindCommon(size_t cPaths, const char * const *papszPaths)
+{
+    return RTPathFindCommonEx(cPaths, papszPaths, RTPATH_STR_F_STYLE_HOST);
+}
+RT_EXPORT_SYMBOL(RTPathFindCommon);
+
diff --git a/src/VBox/Runtime/common/path/RTPathFindCommon.cpp.h b/src/VBox/Runtime/common/path/RTPathFindCommon.cpp.h
new file mode 100644
index 00000000..bd768e6f
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathFindCommon.cpp.h
@@ -0,0 +1,267 @@
+/* $Id: RTPathFindCommon.cpp.h $ */
+/** @file
+ * IPRT - RTPathFindCommon - Code Template.
+ *
+ * This file included multiple times with different path style macros.
+ */
+
+/*
+ * Copyright (C) 2020-2022 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
+ */
+
+#include "rtpath-root-length-template.cpp.h"
+
+
+/** Helper for skipping slashes, given a pointer to the first one.   */
+DECLINLINE(const char *) RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(const char *pszSlash)
+{
+    for (;;)
+    {
+        char ch;
+        do
+            ch = *++pszSlash;
+        while (RTPATH_IS_SLASH(ch));
+
+        /* Also skip '/./' sequences.  */
+        if (   ch != '.'
+            || !RTPATH_IS_SLASH(pszSlash[1]))
+            break;
+        pszSlash++;
+    }
+    return pszSlash;
+}
+
+
+static size_t RTPATH_STYLE_FN(rtPathFindCommon)(size_t cPaths, const char **papszPaths, uint32_t fFlags)
+{
+    /*
+     * Check for '..' elements before we start doing anything.
+     *
+     * They are currently not supported at all (lazy) and we shun them for
+     * security reasons.  Iff we want to support them properly, we'd have to:
+     *  1. Note down exactly where the root specification ends for each of
+     *     the paths so we can prevent '..' from messing with it.
+     *  2. When encountering '..', we'd have to ascend all paths.
+     *  3. When encountering a difference, we'd have to see if it's eliminated
+     *     by a following '..' sequence.
+     *  4. When returning anything, we'd have to see if it could be affected by
+     *     a '..' sequence later in any of the paths.
+     *
+     * We could kind of RTAbsPath the secondary paths, however it wouldn't work
+     * for the primary path we use as reference.
+     *
+     * Summa summarum: Annoyingly tedious, so just forget it.
+     */
+    if (!(fFlags & RTPATHFINDCOMMON_F_IGNORE_DOTDOT))
+        for (size_t i = 0; i < cPaths; i++)
+        {
+            const char * const psz = papszPaths[i];
+            const char *pszDot = strchr(psz, '.');
+            while (pszDot)
+            {
+                if (   pszDot[1] == '.'
+                    && (RTPATH_IS_SLASH(pszDot[2]) || pszDot[2] == '\0')
+                    && (   pszDot == psz
+                        || RTPATH_IS_SLASH(pszDot[-1])
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+                    || (pszDot[-1] == ':' && psz + 2 == pszDot && !(fFlags & RTPATH_STR_F_NO_START))
+#endif
+                       )
+                   )
+                    return 0;
+                pszDot = strchr(pszDot + 1, '.');
+            }
+        }
+
+    /*
+     * We use the first path as the reference for the return length.
+     */
+    const char *       pszPath0            = papszPaths[0];
+    const char *       pszPath0EndLastComp = pszPath0;
+    const char * const pszPath0Start       = pszPath0;
+
+    /*
+     * Deal with root stuff as appropriate.
+     */
+    if (fFlags & RTPATH_STR_F_NO_START)
+    {
+        /* We ignore leading slashes when RTPATH_STR_F_NO_START is specified:  */
+        for (size_t i = 0; i < cPaths; i++)
+        {
+            const char *psz = papszPaths[i];
+            papszPaths[i] = RTPATH_IS_SLASH(*psz) ? RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(psz) : psz;
+        }
+        pszPath0EndLastComp = pszPath0 = papszPaths[0];
+    }
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+    else if (RTPATH_IS_SLASH(pszPath0[0]))
+    {
+        /* UNC requires a little bit of special magic to make sure we have
+           exactly two slashes in each path and don't mix things up. */
+        char ch;
+        if (   RTPATH_IS_SLASH(pszPath0[1])
+            && (ch = pszPath0[2]) != '\0'
+            && !RTPATH_IS_SLASH(ch))
+        {
+            pszPath0 += 2;
+            for (size_t i = 1; i < cPaths; i++)
+            {
+                const char *psz = papszPaths[i];
+                if (   RTPATH_IS_SLASH(psz[0])
+                    && RTPATH_IS_SLASH(psz[1])
+                    && (ch = psz[2]) != '\0'
+                    && !RTPATH_IS_SLASH(ch))
+                    papszPaths[i] = psz + 2;
+                else
+                    return 0;
+            }
+        }
+        else
+        {
+            for (size_t i = 1; i < cPaths; i++)
+            {
+                const char *psz = papszPaths[i];
+                if (   RTPATH_IS_SLASH(psz[0])
+                    && RTPATH_IS_SLASH(psz[1])
+                    && (ch = psz[2]) != '\0'
+                    && !RTPATH_IS_SLASH(ch))
+                    return 0;
+                if (!RTPATH_IS_SLASH(psz[0]))
+                    return 0;
+                papszPaths[i] = RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(psz);
+            }
+            pszPath0EndLastComp = pszPath0 = RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(pszPath0);
+        }
+    }
+    /* Skip past the drive letter if there is one, as that eliminates the need
+       to handle ':' in the main loop below. */
+    else if (   RT_C_IS_ALPHA(pszPath0[0])
+             && pszPath0[1] == ':')
+    {
+        /* Drive letter part first: */
+        char const chDrv = RT_C_TO_UPPER(pszPath0[0]);
+        pszPath0 += 2;
+        pszPath0EndLastComp = pszPath0;
+
+        for (size_t i = 1; i < cPaths; i++)
+        {
+            const char *psz = papszPaths[i];
+            if (   (   psz[0] != chDrv
+                    && RT_C_TO_UPPER(psz[0]) != chDrv)
+                || psz[1] != ':')
+                return 0;
+            papszPaths[i] = psz + 2;
+        }
+
+        /* Subsequent slashes or lack thereof. */
+        if (RTPATH_IS_SLASH(*pszPath0))
+        {
+            for (size_t i = 1; i < cPaths; i++)
+            {
+                const char *psz = papszPaths[i];
+                if (!RTPATH_IS_SLASH(*psz))
+                    return pszPath0EndLastComp - pszPath0Start;
+                papszPaths[i] = RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(psz);
+            }
+            pszPath0EndLastComp = pszPath0 = RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(pszPath0);
+        }
+        else
+            for (size_t i = 1; i < cPaths; i++)
+                if (RTPATH_IS_SLASH(*papszPaths[i]))
+                    return pszPath0EndLastComp - pszPath0Start;
+    }
+#endif
+
+    /*
+     * Main compare loop.
+     */
+    for (;;)
+    {
+        RTUNICP uc0;
+        int rc = RTStrGetCpEx(&pszPath0, &uc0);
+        AssertRCReturn(rc, 0);
+        if (!RTPATH_IS_SLASH(uc0))
+        {
+            if (uc0 != 0)
+            {
+                for (size_t i = 1; i < cPaths; i++)
+                {
+                    RTUNICP uc;
+                    rc = RTStrGetCpEx(&papszPaths[i], &uc);
+                    AssertRCReturn(rc, 0);
+                    if (uc == uc0)
+                    { /* likely */}
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+                    else if (   RTUniCpToUpper(uc) == RTUniCpToUpper(uc0)
+                             || RTUniCpToLower(uc) == RTUniCpToLower(uc0))
+                    { /* less likely */}
+#endif
+                    else
+                        return pszPath0EndLastComp - pszPath0Start;
+                }
+            }
+            else
+            {
+                /* pszPath0 is at an end.  Check the state of the others as we must
+                   return the whole pszPath0 length if their are also at the end of
+                   at a slash. */
+                for (size_t i = 1; i < cPaths; i++)
+                {
+                    char ch = *papszPaths[i];
+                    if (   ch != '\0'
+                        && !RTPATH_IS_SLASH(ch))
+                        return pszPath0EndLastComp - pszPath0Start;
+                }
+                return pszPath0 - 1 - pszPath0Start;
+            }
+        }
+        else
+        {
+            /* pszPath0 is at a slash.  Check whether all the other are too or are at
+               the end of the string.  If any other string ends here, we can return
+               the length up to but not including the slash. */
+            bool fDone = false;
+            for (size_t i = 1; i < cPaths; i++)
+            {
+                char ch = *papszPaths[i];
+                if (ch == '\0')
+                    fDone = true;
+                else if (RTPATH_IS_SLASH(ch))
+                    papszPaths[i] = RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(papszPaths[i]);
+                else
+                    return pszPath0EndLastComp - pszPath0Start;
+            }
+            if (fDone)
+                return pszPath0 - pszPath0Start;
+            pszPath0EndLastComp = pszPath0 = RTPATH_STYLE_FN(rtPathHlpSkipSlashes)(pszPath0 - 1);
+        }
+    }
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathGlob.cpp b/src/VBox/Runtime/common/path/RTPathGlob.cpp
new file mode 100644
index 00000000..351efbb3
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathGlob.cpp
@@ -0,0 +1,2177 @@
+/* $Id: RTPathGlob.cpp $ */
+/** @file
+ * IPRT - RTPathGlob
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/buildconfig.h>
+#include <iprt/ctype.h>
+#include <iprt/dir.h>
+#include <iprt/env.h>
+#include <iprt/err.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+#include <iprt/uni.h>
+
+#if defined(RT_OS_WINDOWS)
+# include <iprt/utf16.h>
+# include <iprt/win/windows.h>
+# include "../../r3/win/internal-r3-win.h"
+
+#elif defined(RT_OS_OS2)
+# define INCL_BASE
+# include <os2.h>
+# undef RT_MAX /* collision */
+
+#endif
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** Maximum number of results. */
+#define RTPATHGLOB_MAX_RESULTS          _32K
+/** Maximum number of zero-or-more wildcards in a pattern.
+ * This limits stack usage and recursion depth, as well as execution time. */
+#define RTPATHMATCH_MAX_ZERO_OR_MORE    24
+/** Maximum number of variable items. */
+#define RTPATHMATCH_MAX_VAR_ITEMS       _4K
+
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Matching operation.
+ */
+typedef enum RTPATHMATCHOP
+{
+    RTPATHMATCHOP_INVALID = 0,
+    /** EOS: Returns a match if at end of string. */
+    RTPATHMATCHOP_RETURN_MATCH_IF_AT_END,
+    /** Asterisk: Returns a match (trailing asterisk). */
+    RTPATHMATCHOP_RETURN_MATCH,
+    /** Asterisk: Returns a match (just asterisk), unless it's '.' or '..'. */
+    RTPATHMATCHOP_RETURN_MATCH_EXCEPT_DOT_AND_DOTDOT,
+    /** Plain text: Case sensitive string compare. */
+    RTPATHMATCHOP_STRCMP,
+    /** Plain text: Case insensitive string compare. */
+    RTPATHMATCHOP_STRICMP,
+    /** Question marks: Skips exactly one code point. */
+    RTPATHMATCHOP_SKIP_ONE_CODEPOINT,
+    /** Question marks: Skips exactly RTPATHMATCHCORE::cch code points. */
+    RTPATHMATCHOP_SKIP_MULTIPLE_CODEPOINTS,
+    /** Char set: Requires the next codepoint to be in the ASCII-7 set defined by
+     *            RTPATHMATCHCORE::pch & RTPATHMATCHCORE::cch.  No ranges. */
+    RTPATHMATCHOP_CODEPOINT_IN_SET_ASCII7,
+    /** Char set: Requires the next codepoint to not be in the ASCII-7 set defined
+     *            by RTPATHMATCHCORE::pch & RTPATHMATCHCORE::cch.  No ranges. */
+    RTPATHMATCHOP_CODEPOINT_NOT_IN_SET_ASCII7,
+    /** Char set: Requires the next codepoint to be in the extended set defined by
+     *            RTPATHMATCHCORE::pch & RTPATHMATCHCORE::cch.  Ranges, UTF-8. */
+    RTPATHMATCHOP_CODEPOINT_IN_SET_EXTENDED,
+    /** Char set: Requires the next codepoint to not be in the extended set defined
+     *            by RTPATHMATCHCORE::pch & RTPATHMATCHCORE::cch.  Ranges, UTF-8. */
+    RTPATHMATCHOP_CODEPOINT_NOT_IN_SET_EXTENDED,
+    /** Variable: Case sensitive variable value compare, RTPATHMATCHCORE::uOp2 is
+     *            the variable table index. */
+    RTPATHMATCHOP_VARIABLE_VALUE_CMP,
+    /** Variable: Case insensitive variable value compare, RTPATHMATCHCORE::uOp2 is
+     *            the variable table index. */
+    RTPATHMATCHOP_VARIABLE_VALUE_ICMP,
+    /** Asterisk: Match zero or more code points, there must be at least
+     * RTPATHMATCHCORE::cch code points after it. */
+    RTPATHMATCHOP_ZERO_OR_MORE,
+    /** Asterisk: Match zero or more code points, there must be at least
+     * RTPATHMATCHCORE::cch code points after it, unless it's '.' or '..'. */
+    RTPATHMATCHOP_ZERO_OR_MORE_EXCEPT_DOT_AND_DOTDOT,
+    /** End of valid operations.   */
+    RTPATHMATCHOP_END
+} RTPATHMATCHOP;
+
+/**
+ * Matching instruction.
+ */
+typedef struct RTPATHMATCHCORE
+{
+    /** The action to take. */
+    RTPATHMATCHOP       enmOpCode;
+    /** Generic value operand. */
+    uint16_t            uOp2;
+    /** Generic length operand. */
+    uint16_t            cch;
+    /** Generic string pointer operand. */
+    const char         *pch;
+} RTPATHMATCHCORE;
+/** Pointer to a matching instruction. */
+typedef RTPATHMATCHCORE *PRTPATHMATCHCORE;
+/** Pointer to a const matching instruction. */
+typedef RTPATHMATCHCORE const *PCRTPATHMATCHCORE;
+
+/**
+ * Path matching instruction allocator.
+ */
+typedef struct RTPATHMATCHALLOC
+{
+    /** Allocated array of instructions. */
+    PRTPATHMATCHCORE    paInstructions;
+    /** Index of the next free entry in paScratch. */
+    uint32_t            iNext;
+    /** Number of instructions allocated. */
+    uint32_t            cAllocated;
+} RTPATHMATCHALLOC;
+/** Pointer to a matching instruction allocator. */
+typedef RTPATHMATCHALLOC *PRTPATHMATCHALLOC;
+
+/**
+ * Path matching cache, mainly intended for variables like the PATH.
+ */
+typedef struct RTPATHMATCHCACHE
+{
+    /** @todo optimize later. */
+    uint32_t            iNothingYet;
+} RTPATHMATCHCACHE;
+/** Pointer to a path matching cache. */
+typedef RTPATHMATCHCACHE *PRTPATHMATCHCACHE;
+
+
+
+/** Parsed path entry.*/
+typedef struct RTPATHGLOBPPE
+{
+    /** Normal: Index into RTPATHGLOB::MatchInstrAlloc.paInstructions. */
+    uint32_t            iMatchProg : 16;
+    /** Set if this is a normal entry which is matched using iMatchProg. */
+    uint32_t            fNormal : 1;
+    /** !fNormal: Plain name that can be dealt with using without
+     * enumerating the whole directory, unless of course the file system is case
+     * sensitive and the globbing isn't (that needs figuring out on a per
+     * directory basis). */
+    uint32_t            fPlain : 1;
+    /** !fNormal: Match zero or more subdirectories. */
+    uint32_t            fStarStar : 1;
+    /** !fNormal: The whole component is a variable expansion. */
+    uint32_t            fExpVariable : 1;
+
+    /** Filter: Set if it only matches directories. */
+    uint32_t            fDir : 1;
+    /** Set if it's the final component. */
+    uint32_t            fFinal : 1;
+
+    /** Unused bits. */
+    uint32_t            fReserved : 2+8;
+} RTPATHGLOBPPE;
+
+
+typedef struct RTPATHGLOB
+{
+    /** Path buffer. */
+    char                szPath[RTPATH_MAX];
+    /** Temporary buffers. */
+    union
+    {
+        /** File system object info structure. */
+        RTFSOBJINFO     ObjInfo;
+        /** Directory entry buffer. */
+        RTDIRENTRY      DirEntry;
+        /** Padding the buffer to an unreasonably large size. */
+        uint8_t         abPadding[RTPATH_MAX + sizeof(RTDIRENTRY)];
+    } u;
+
+
+    /** Where to insert the next one.*/
+    PRTPATHGLOBENTRY   *ppNext;
+    /** The head pointer. */
+    PRTPATHGLOBENTRY    pHead;
+    /** Result count. */
+    uint32_t            cResults;
+    /** Counts path overflows. */
+    uint32_t            cPathOverflows;
+    /** The input flags. */
+    uint32_t            fFlags;
+    /** Matching instruction allocator. */
+    RTPATHMATCHALLOC    MatchInstrAlloc;
+    /** Matching state. */
+    RTPATHMATCHCACHE    MatchCache;
+
+    /** The pattern string.   */
+    const char         *pszPattern;
+    /** The parsed path.   */
+    PRTPATHPARSED       pParsed;
+    /** The component to start with. */
+    uint16_t            iFirstComp;
+    /** The corresponding path offset (previous components already present). */
+    uint16_t            offFirstPath;
+    /** Path component information we need. */
+    RTPATHGLOBPPE       aComps[1];
+} RTPATHGLOB;
+typedef RTPATHGLOB *PRTPATHGLOB;
+
+
+/**
+ * Matching variable lookup table.
+ * Currently so small we don't bother sorting it and doing binary lookups.
+ */
+typedef struct RTPATHMATCHVAR
+{
+    /** The variable name. */
+    const char     *pszName;
+    /** The variable name length. */
+    uint16_t        cchName;
+    /** Only available as the verify first component.  */
+    bool            fFirstOnly;
+
+    /**
+     * Queries a given variable value.
+     *
+     * @returns IPRT status code.
+     * @retval  VERR_BUFFER_OVERFLOW
+     * @retval  VERR_TRY_AGAIN if the caller should skip this value item and try the
+     *          next one instead (e.g. env var not present).
+     * @retval  VINF_EOF when retrieving the last one, if possible.
+     * @retval  VERR_EOF when @a iItem is past the item space.
+     *
+     * @param   iItem       The variable value item to retrieve. (A variable may
+     *                      have more than one value, e.g. 'BothProgramFile' on a
+     *                      64-bit system or 'Path'.)
+     * @param   pszBuf      Where to return the value.
+     * @param   cbBuf       The buffer size.
+     * @param   pcchValue   Where to return the length of the return string.
+     * @param   pCache      Pointer to the path matching cache.  May speed up
+     *                      enumerating PATH items and similar.
+     */
+    DECLCALLBACKMEMBER(int, pfnQuery,(uint32_t iItem, char *pszBuf, size_t cbBuf, size_t *pcchValue, PRTPATHMATCHCACHE pCache));
+
+    /**
+     * Matching method, optional.
+     *
+     * @returns IPRT status code.
+     * @retval  VINF_SUCCESS on match.
+     * @retval  VERR_MISMATCH on mismatch.
+     *
+     * @param   pszMatch    String to match with (not terminated).
+     * @param   cchMatch    The length of what we match with.
+     * @param   fIgnoreCase Whether to ignore case or not when comparing.
+     * @param   pcchMatched Where to return the length of the match (value length).
+     */
+    DECLCALLBACKMEMBER(int, pfnMatch,(const char *pchMatch, size_t cchMatch, bool fIgnoreCase, size_t *pcchMatched));
+
+} RTPATHMATCHVAR;
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+static int rtPathGlobExecRecursiveStarStar(PRTPATHGLOB pGlob, size_t offPath, uint32_t iStarStarComp, size_t offStarStarPath);
+static int rtPathGlobExecRecursiveVarExp(PRTPATHGLOB pGlob, size_t offPath, uint32_t iComp);
+static int rtPathGlobExecRecursivePlainText(PRTPATHGLOB pGlob, size_t offPath, uint32_t iComp);
+static int rtPathGlobExecRecursiveGeneric(PRTPATHGLOB pGlob, size_t offPath, uint32_t iComp);
+
+
+/**
+ * Implements the two variable access functions for a simple one value variable.
+ */
+#define RTPATHMATCHVAR_SIMPLE(a_Name, a_GetStrExpr) \
+    static DECLCALLBACK(int) RT_CONCAT(rtPathVarQuery_,a_Name)(uint32_t iItem, char *pszBuf, size_t cbBuf, size_t *pcchValue, \
+                                                               PRTPATHMATCHCACHE pCache) \
+    { \
+        if (iItem == 0) \
+        { \
+            const char *pszValue = a_GetStrExpr; \
+            size_t      cchValue = strlen(pszValue); \
+            if (cchValue + 1 <= cbBuf) \
+            { \
+                memcpy(pszBuf, pszValue, cchValue + 1); \
+                *pcchValue = cchValue; \
+                return VINF_EOF; \
+            } \
+            return VERR_BUFFER_OVERFLOW; \
+        } \
+        NOREF(pCache);\
+        return VERR_EOF; \
+    } \
+    static DECLCALLBACK(int) RT_CONCAT(rtPathVarMatch_,a_Name)(const char *pchMatch, size_t cchMatch, bool fIgnoreCase, \
+                                                               size_t *pcchMatched) \
+    { \
+        const char *pszValue = a_GetStrExpr; \
+        size_t      cchValue = strlen(pszValue); \
+        if (   cchValue >= cchMatch \
+            && (  !fIgnoreCase \
+                ? memcmp(pszValue, pchMatch, cchValue) == 0 \
+                : RTStrNICmp(pszValue, pchMatch, cchValue) == 0) ) \
+        { \
+            *pcchMatched = cchValue; \
+            return VINF_SUCCESS; \
+        } \
+        return VERR_MISMATCH; \
+    } \
+    typedef int RT_CONCAT(DummyColonType_,a_Name)
+
+/**
+ * Implements mapping a glob variable to an environment variable.
+ */
+#define RTPATHMATCHVAR_SIMPLE_ENVVAR(a_Name, a_pszEnvVar, a_cbMaxValue) \
+    static DECLCALLBACK(int) RT_CONCAT(rtPathVarQuery_,a_Name)(uint32_t iItem, char *pszBuf, size_t cbBuf, size_t *pcchValue, \
+                                                               PRTPATHMATCHCACHE pCache) \
+    { \
+        if (iItem == 0) \
+        { \
+            int rc = RTEnvGetEx(RTENV_DEFAULT, a_pszEnvVar, pszBuf, cbBuf, pcchValue); \
+            if (RT_SUCCESS(rc)) \
+                return VINF_EOF; \
+            if (rc != VERR_ENV_VAR_NOT_FOUND) \
+                return rc; \
+        } \
+        NOREF(pCache);\
+        return VERR_EOF; \
+    } \
+    static DECLCALLBACK(int) RT_CONCAT(rtPathVarMatch_,a_Name)(const char *pchMatch, size_t cchMatch, bool fIgnoreCase, \
+                                                               size_t *pcchMatched) \
+    { \
+        char   szValue[a_cbMaxValue]; \
+        size_t cchValue; \
+        int rc = RTEnvGetEx(RTENV_DEFAULT, a_pszEnvVar, szValue, sizeof(szValue), &cchValue); \
+        if (   RT_SUCCESS(rc) \
+            && cchValue >= cchMatch \
+            && (  !fIgnoreCase \
+                ? memcmp(szValue, pchMatch, cchValue) == 0 \
+                : RTStrNICmp(szValue, pchMatch, cchValue) == 0) ) \
+        { \
+            *pcchMatched = cchValue; \
+            return VINF_SUCCESS; \
+        } \
+        return VERR_MISMATCH; \
+    } \
+    typedef int RT_CONCAT(DummyColonType_,a_Name)
+
+/**
+ * Implements mapping a glob variable to multiple environment variable values.
+ *
+ * @param   a_Name              The variable name.
+ * @param   a_apszVarNames      Assumes to be a global variable that RT_ELEMENTS
+ *                              works correctly on.
+ * @param   a_cbMaxValue        The max expected value size.
+ */
+#define RTPATHMATCHVAR_MULTIPLE_ENVVARS(a_Name, a_apszVarNames, a_cbMaxValue) \
+    static DECLCALLBACK(int) RT_CONCAT(rtPathVarQuery_,a_Name)(uint32_t iItem, char *pszBuf, size_t cbBuf, size_t *pcchValue, \
+                                                               PRTPATHMATCHCACHE pCache) \
+    { \
+        if (iItem < RT_ELEMENTS(a_apszVarNames)) \
+        { \
+            int rc = RTEnvGetEx(RTENV_DEFAULT, a_apszVarNames[iItem], pszBuf, cbBuf, pcchValue); \
+            if (RT_SUCCESS(rc)) \
+                return iItem + 1 == RT_ELEMENTS(a_apszVarNames) ? VINF_EOF : VINF_SUCCESS; \
+            if (rc == VERR_ENV_VAR_NOT_FOUND) \
+                rc = VERR_TRY_AGAIN; \
+            return rc; \
+        } \
+        NOREF(pCache);\
+        return VERR_EOF; \
+    } \
+    static DECLCALLBACK(int) RT_CONCAT(rtPathVarMatch_,a_Name)(const char *pchMatch, size_t cchMatch, bool fIgnoreCase, \
+                                                               size_t *pcchMatched) \
+    { \
+        for (uint32_t iItem = 0; iItem < RT_ELEMENTS(a_apszVarNames); iItem++) \
+        { \
+            char   szValue[a_cbMaxValue]; \
+            size_t cchValue; \
+            int rc = RTEnvGetEx(RTENV_DEFAULT, a_apszVarNames[iItem], szValue, sizeof(szValue), &cchValue);\
+            if (   RT_SUCCESS(rc) \
+                && cchValue >= cchMatch \
+                && (  !fIgnoreCase \
+                    ? memcmp(szValue, pchMatch, cchValue) == 0 \
+                    : RTStrNICmp(szValue, pchMatch, cchValue) == 0) ) \
+            { \
+                *pcchMatched = cchValue; \
+                return VINF_SUCCESS; \
+            } \
+        } \
+        return VERR_MISMATCH; \
+    } \
+    typedef int RT_CONCAT(DummyColonType_,a_Name)
+
+
+RTPATHMATCHVAR_SIMPLE(Arch, RTBldCfgTargetArch());
+RTPATHMATCHVAR_SIMPLE(Bits, RT_XSTR(ARCH_BITS));
+#ifdef RT_OS_WINDOWS
+RTPATHMATCHVAR_SIMPLE_ENVVAR(WinAppData,                    "AppData",              RTPATH_MAX);
+RTPATHMATCHVAR_SIMPLE_ENVVAR(WinProgramData,                "ProgramData",          RTPATH_MAX);
+RTPATHMATCHVAR_SIMPLE_ENVVAR(WinProgramFiles,               "ProgramFiles",         RTPATH_MAX);
+RTPATHMATCHVAR_SIMPLE_ENVVAR(WinCommonProgramFiles,         "CommonProgramFiles",       RTPATH_MAX);
+# if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+RTPATHMATCHVAR_SIMPLE_ENVVAR(WinOtherProgramFiles,          "ProgramFiles(x86)",        RTPATH_MAX);
+RTPATHMATCHVAR_SIMPLE_ENVVAR(WinOtherCommonProgramFiles,    "CommonProgramFiles(x86)",  RTPATH_MAX);
+# else
+#  error "Port ME!"
+# endif
+static const char * const a_apszWinProgramFilesVars[] =
+{
+    "ProgramFiles",
+# ifdef RT_ARCH_AMD64
+    "ProgramFiles(x86)",
+# endif
+};
+RTPATHMATCHVAR_MULTIPLE_ENVVARS(WinAllProgramFiles, a_apszWinProgramFilesVars, RTPATH_MAX);
+static const char * const a_apszWinCommonProgramFilesVars[] =
+{
+    "CommonProgramFiles",
+# ifdef RT_ARCH_AMD64
+    "CommonProgramFiles(x86)",
+# endif
+};
+RTPATHMATCHVAR_MULTIPLE_ENVVARS(WinAllCommonProgramFiles, a_apszWinCommonProgramFilesVars, RTPATH_MAX);
+#endif
+
+
+/**
+ * @interface_method_impl{RTPATHMATCHVAR,pfnQuery, Enumerates the PATH}
+ */
+static DECLCALLBACK(int) rtPathVarQuery_Path(uint32_t iItem, char *pszBuf, size_t cbBuf, size_t *pcchValue,
+                                             PRTPATHMATCHCACHE pCache)
+{
+    RT_NOREF_PV(pCache);
+
+    /*
+     * Query the PATH value.
+     */
+/** @todo cache this in pCache with iItem and offset.   */
+    char       *pszPathFree = NULL;
+    char       *pszPath     = pszBuf;
+    size_t      cchActual;
+    const char *pszVarNm    = "PATH";
+    int rc = RTEnvGetEx(RTENV_DEFAULT, pszVarNm, pszPath, cbBuf, &cchActual);
+#ifdef RT_OS_WINDOWS
+    if (rc == VERR_ENV_VAR_NOT_FOUND)
+        rc = RTEnvGetEx(RTENV_DEFAULT, pszVarNm = "Path", pszPath, cbBuf, &cchActual);
+#endif
+    if (rc == VERR_BUFFER_OVERFLOW)
+    {
+        for (uint32_t iTry = 0; iTry < 10; iTry++)
+        {
+            size_t cbPathBuf = RT_ALIGN_Z(cchActual + 1 + 64 * iTry, 64);
+            pszPathFree = (char *)RTMemTmpAlloc(cbPathBuf);
+            rc = RTEnvGetEx(RTENV_DEFAULT, pszVarNm, pszPathFree, cbPathBuf, &cchActual);
+            if (RT_SUCCESS(rc))
+                break;
+            RTMemTmpFree(pszPathFree);
+            AssertReturn(cchActual >= cbPathBuf, VERR_INTERNAL_ERROR_3);
+        }
+        pszPath = pszPathFree;
+    }
+
+    /*
+     * Spool forward to the given PATH item.
+     */
+    rc = VERR_EOF;
+#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
+    const char  chSep = ';';
+#else
+    const char  chSep = ':';
+#endif
+    while (*pszPath != '\0')
+    {
+        char *pchSep = strchr(pszPath, chSep);
+
+        /* We ignore empty strings, which is probably not entirely correct,
+           but works better on DOS based system with many entries added
+           without checking whether there is a trailing separator or not.
+           Thus, the current directory is only searched if a '.' is present
+           in the PATH. */
+        if (pchSep == pszPath)
+            pszPath++;
+        else if (iItem > 0)
+        {
+            /* If we didn't find a separator, the item doesn't exists. Quit. */
+            if (!pchSep)
+                break;
+
+            pszPath = pchSep + 1;
+            iItem--;
+        }
+        else
+        {
+            /* We've reached the item we wanted. */
+            size_t cchComp = pchSep ? pchSep - pszPath : strlen(pszPath);
+            if (cchComp < cbBuf)
+            {
+                if (pszBuf != pszPath)
+                    memmove(pszBuf, pszPath, cchComp);
+                pszBuf[cchComp] = '\0';
+                rc = pchSep ? VINF_SUCCESS : VINF_EOF;
+            }
+            else
+                rc = VERR_BUFFER_OVERFLOW;
+            *pcchValue = cchComp;
+            break;
+        }
+    }
+
+    if (pszPathFree)
+        RTMemTmpFree(pszPathFree);
+    return rc;
+}
+
+
+#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
+/**
+ * @interface_method_impl{RTPATHMATCHVAR,pfnQuery,
+ *      The system drive letter + colon.}.
+ */
+static DECLCALLBACK(int) rtPathVarQuery_DosSystemDrive(uint32_t iItem, char *pszBuf, size_t cbBuf, size_t *pcchValue,
+                                                       PRTPATHMATCHCACHE pCache)
+{
+    RT_NOREF_PV(pCache);
+
+    if (iItem == 0)
+    {
+        AssertReturn(cbBuf >= 3, VERR_BUFFER_OVERFLOW);
+
+# ifdef RT_OS_WINDOWS
+        /* Since this is used at the start of a pattern, we assume
+           we've got more than enough buffer space. */
+        AssertReturn(g_pfnGetSystemWindowsDirectoryW, VERR_SYMBOL_NOT_FOUND);
+        PRTUTF16 pwszTmp = (PRTUTF16)pszBuf;
+        UINT cch = g_pfnGetSystemWindowsDirectoryW(pwszTmp, (UINT)(cbBuf / sizeof(WCHAR)));
+        if (cch >= 2)
+        {
+            RTUTF16 wcDrive = pwszTmp[0];
+            if (   RT_C_IS_ALPHA(wcDrive)
+                && pwszTmp[1] == ':')
+            {
+                pszBuf[0] = wcDrive;
+                pszBuf[1] = ':';
+                pszBuf[2] = '\0';
+                *pcchValue = 2;
+                return VINF_EOF;
+            }
+        }
+# else
+        ULONG ulDrive = ~(ULONG)0;
+        APIRET rc = DosQuerySysInfo(QSV_BOOT_DRIVE, QSV_BOOT_DRIVE, &ulDrive, sizeof(ulDrive));
+        ulDrive--; /* 1 = 'A' */
+        if (   rc == NO_ERROR
+            && ulDrive <= (ULONG)'Z')
+        {
+            pszBuf[0] = (char)ulDrive + 'A';
+            pszBuf[1] = ':';
+            pszBuf[2] = '\0';
+            *pcchValue = 2;
+            return VINF_EOF;
+        }
+# endif
+        return VERR_INTERNAL_ERROR_4;
+    }
+    return VERR_EOF;
+}
+#endif
+
+
+#ifdef RT_OS_WINDOWS
+/**
+ * @interface_method_impl{RTPATHMATCHVAR,pfnQuery,
+ *      The system root directory (C:\Windows).}.
+ */
+static DECLCALLBACK(int) rtPathVarQuery_WinSystemRoot(uint32_t iItem, char *pszBuf, size_t cbBuf, size_t *pcchValue,
+                                                      PRTPATHMATCHCACHE pCache)
+{
+    RT_NOREF_PV(pCache);
+
+    if (iItem == 0)
+    {
+        Assert(pszBuf); Assert(cbBuf);
+        AssertReturn(g_pfnGetSystemWindowsDirectoryW, VERR_SYMBOL_NOT_FOUND);
+        RTUTF16 wszSystemRoot[MAX_PATH];
+        UINT cchSystemRoot = g_pfnGetSystemWindowsDirectoryW(wszSystemRoot, MAX_PATH);
+        if (cchSystemRoot > 0)
+            return RTUtf16ToUtf8Ex(wszSystemRoot, cchSystemRoot, &pszBuf, cbBuf, pcchValue);
+        return RTErrConvertFromWin32(GetLastError());
+    }
+    return VERR_EOF;
+}
+#endif
+
+#undef RTPATHMATCHVAR_SIMPLE
+#undef RTPATHMATCHVAR_SIMPLE_ENVVAR
+#undef RTPATHMATCHVAR_DOUBLE_ENVVAR
+
+/**
+ * Variables.
+ */
+static RTPATHMATCHVAR const g_aVariables[] =
+{
+    { RT_STR_TUPLE("Arch"),                     false,  rtPathVarQuery_Arch,                        rtPathVarMatch_Arch },
+    { RT_STR_TUPLE("Bits"),                     false,  rtPathVarQuery_Bits,                        rtPathVarMatch_Bits },
+    { RT_STR_TUPLE("Path"),                     true,   rtPathVarQuery_Path,                        NULL },
+#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
+    { RT_STR_TUPLE("SystemDrive"),              true,   rtPathVarQuery_DosSystemDrive,              NULL },
+#endif
+#ifdef RT_OS_WINDOWS
+    { RT_STR_TUPLE("SystemRoot"),               true,   rtPathVarQuery_WinSystemRoot,               NULL },
+    { RT_STR_TUPLE("AppData"),                  true,   rtPathVarQuery_WinAppData,                  rtPathVarMatch_WinAppData },
+    { RT_STR_TUPLE("ProgramData"),              true,   rtPathVarQuery_WinProgramData,              rtPathVarMatch_WinProgramData },
+    { RT_STR_TUPLE("ProgramFiles"),             true,   rtPathVarQuery_WinProgramFiles,             rtPathVarMatch_WinProgramFiles },
+    { RT_STR_TUPLE("OtherProgramFiles"),        true,   rtPathVarQuery_WinOtherProgramFiles,        rtPathVarMatch_WinOtherProgramFiles },
+    { RT_STR_TUPLE("AllProgramFiles"),          true,   rtPathVarQuery_WinAllProgramFiles,          rtPathVarMatch_WinAllProgramFiles },
+    { RT_STR_TUPLE("CommonProgramFiles"),       true,   rtPathVarQuery_WinCommonProgramFiles,       rtPathVarMatch_WinCommonProgramFiles },
+    { RT_STR_TUPLE("OtherCommonProgramFiles"),  true,   rtPathVarQuery_WinOtherCommonProgramFiles,  rtPathVarMatch_WinOtherCommonProgramFiles },
+    { RT_STR_TUPLE("AllCommonProgramFiles"),    true,   rtPathVarQuery_WinAllCommonProgramFiles,    rtPathVarMatch_WinAllCommonProgramFiles },
+#endif
+};
+
+
+
+/**
+ * Handles a complicated set.
+ *
+ * A complicated set is either using ranges, character classes or code points
+ * outside the ASCII-7 range.
+ *
+ * @returns VINF_SUCCESS or VERR_MISMATCH.  May also return UTF-8 decoding
+ *          errors as well as VERR_PATH_MATCH_FEATURE_NOT_IMPLEMENTED.
+ *
+ * @param   ucInput     The input code point to match with.
+ * @param   pchSet      The start of the set specification (after caret).
+ * @param   cchSet      The length of the set specification.
+ */
+static int rtPathMatchExecExtendedSet(RTUNICP ucInput, const char *pchSet, size_t cchSet)
+{
+    while (cchSet > 0)
+    {
+        RTUNICP ucSet;
+        int rc = RTStrGetCpNEx(&pchSet, &cchSet, &ucSet);
+        AssertRCReturn(rc, rc);
+
+        /*
+         * Check for character class, collating symbol and equvalence class.
+         */
+        if (ucSet == '[' && cchSet > 0)
+        {
+            char chNext = *pchSet;
+            if (chNext == ':')
+            {
+#define CHECK_CHAR_CLASS(a_szClassNm, a_BoolTestExpr) \
+                    if (   cchSet >= sizeof(a_szClassNm) \
+                        && memcmp(pchSet, a_szClassNm "]", sizeof(a_szClassNm)) == 0) \
+                    { \
+                        if (a_BoolTestExpr) \
+                            return VINF_SUCCESS; \
+                        pchSet += sizeof(a_szClassNm); \
+                        cchSet -= sizeof(a_szClassNm); \
+                        continue; \
+                    } do { } while (0)
+
+                CHECK_CHAR_CLASS(":alpha:", RTUniCpIsAlphabetic(ucInput));
+                CHECK_CHAR_CLASS(":alnum:", RTUniCpIsAlphabetic(ucInput) || RTUniCpIsDecDigit(ucInput)); /** @todo figure what's correct here and fix uni.h */
+                CHECK_CHAR_CLASS(":blank:", ucInput == ' ' || ucInput == '\t');
+                CHECK_CHAR_CLASS(":cntrl:", ucInput < 31 || ucInput == 127);
+                CHECK_CHAR_CLASS(":digit:", RTUniCpIsDecDigit(ucInput));
+                CHECK_CHAR_CLASS(":lower:", RTUniCpIsLower(ucInput));
+                CHECK_CHAR_CLASS(":print:", RTUniCpIsAlphabetic(ucInput) || (RT_C_IS_PRINT(ucInput) && ucInput < 127)); /** @todo fixme*/
+                CHECK_CHAR_CLASS(":punct:", RT_C_IS_PRINT(ucInput) && ucInput < 127); /** @todo fixme*/
+                CHECK_CHAR_CLASS(":space:", RTUniCpIsSpace(ucInput));
+                CHECK_CHAR_CLASS(":upper:", RTUniCpIsUpper(ucInput));
+                CHECK_CHAR_CLASS(":xdigit:", RTUniCpIsHexDigit(ucInput));
+                AssertMsgFailedReturn(("Unknown or malformed char class: '%.*s'\n", cchSet + 1, pchSet - 1),
+                                      VERR_PATH_GLOB_UNKNOWN_CHAR_CLASS);
+#undef CHECK_CHAR_CLASS
+            }
+            /** @todo implement collating symbol and equvalence class. */
+            else if (chNext == '=' || chNext == '.')
+                AssertFailedReturn(VERR_PATH_MATCH_FEATURE_NOT_IMPLEMENTED);
+        }
+
+        /*
+         * Check for range (leading or final dash does not constitute a range).
+         */
+        if (cchSet > 1 && *pchSet == '-')
+        {
+            pchSet++;                   /* skip dash */
+            cchSet--;
+
+            RTUNICP ucSet2;
+            rc = RTStrGetCpNEx(&pchSet, &cchSet, &ucSet2);
+            AssertRCReturn(rc, rc);
+            Assert(ucSet < ucSet2);
+            if (ucInput >= ucSet && ucInput <= ucSet2)
+                return VINF_SUCCESS;
+        }
+        /*
+         * Single char comparison.
+         */
+        else if (ucInput == ucSet)
+            return VINF_SUCCESS;
+    }
+    return VERR_MISMATCH;
+}
+
+
+/**
+ * Variable matching fallback using the query function.
+ *
+ * This must not be inlined as it consuming a lot of stack!  Which is why it's
+ * placed a couple of functions away from the recursive rtPathExecMatch.
+ *
+ * @returns VINF_SUCCESS or VERR_MISMATCH.
+ * @param   pchInput            The current input position.
+ * @param   cchInput            The amount of input left..
+ * @param   idxVar              The variable table index.
+ * @param   fIgnoreCase         Whether to ignore case when comparing.
+ * @param   pcchMatched         Where to return how much we actually matched up.
+ * @param   pCache              Pointer to the path matching cache.
+ */
+DECL_NO_INLINE(static, int) rtPathMatchExecVariableFallback(const char *pchInput, size_t cchInput, uint16_t idxVar,
+                                                            bool fIgnoreCase, size_t *pcchMatched, PRTPATHMATCHCACHE pCache)
+{
+    for (uint32_t iItem = 0; iItem < RTPATHMATCH_MAX_VAR_ITEMS; iItem++)
+    {
+        char   szValue[RTPATH_MAX];
+        size_t cchValue;
+        int rc = g_aVariables[idxVar].pfnQuery(iItem, szValue, sizeof(szValue), &cchValue, pCache);
+        if (RT_SUCCESS(rc))
+        {
+            if (cchValue <= cchInput)
+            {
+                if (  !fIgnoreCase
+                    ? memcmp(pchInput, szValue, cchValue) == 0
+                    : RTStrNICmp(pchInput, szValue, cchValue) == 0)
+                {
+                    *pcchMatched = cchValue;
+                    return VINF_SUCCESS;
+                }
+            }
+            if (rc == VINF_EOF)
+                return VERR_MISMATCH;
+        }
+        else if (rc == VERR_EOF)
+            return VERR_MISMATCH;
+        else
+            Assert(rc == VERR_BUFFER_OVERFLOW || rc == VERR_TRY_AGAIN);
+    }
+    AssertFailed();
+    return VERR_MISMATCH;
+}
+
+
+/**
+ * Variable matching worker.
+ *
+ * @returns VINF_SUCCESS or VERR_MISMATCH.
+ * @param   pchInput            The current input position.
+ * @param   cchInput            The amount of input left..
+ * @param   idxVar              The variable table index.
+ * @param   fIgnoreCase         Whether to ignore case when comparing.
+ * @param   pcchMatched         Where to return how much we actually matched up.
+ * @param   pCache              Pointer to the path matching cache.
+ */
+static int rtPathMatchExecVariable(const char *pchInput, size_t cchInput, uint16_t idxVar,
+                                   bool fIgnoreCase, size_t *pcchMatched, PRTPATHMATCHCACHE pCache)
+{
+    Assert(idxVar < RT_ELEMENTS(g_aVariables));
+    if (g_aVariables[idxVar].pfnMatch)
+        return g_aVariables[idxVar].pfnMatch(pchInput, cchInput, fIgnoreCase, pcchMatched);
+    return rtPathMatchExecVariableFallback(pchInput, cchInput, idxVar, fIgnoreCase, pcchMatched, pCache);
+}
+
+
+/**
+ * Variable matching worker.
+ *
+ * @returns VINF_SUCCESS or VERR_MISMATCH.
+ * @param   pchInput            The current input position.
+ * @param   cchInput            The amount of input left..
+ * @param   pProg               The first matching program instruction.
+ * @param   pCache              Pointer to the path matching cache.
+ */
+static int rtPathMatchExec(const char *pchInput, size_t cchInput, PCRTPATHMATCHCORE pProg, PRTPATHMATCHCACHE pCache)
+{
+    for (;;)
+    {
+        switch (pProg->enmOpCode)
+        {
+            case RTPATHMATCHOP_RETURN_MATCH_IF_AT_END:
+                return cchInput == 0 ? VINF_SUCCESS : VERR_MISMATCH;
+
+            case RTPATHMATCHOP_RETURN_MATCH:
+                return VINF_SUCCESS;
+
+            case RTPATHMATCHOP_RETURN_MATCH_EXCEPT_DOT_AND_DOTDOT:
+                if (   cchInput > 2
+                    || cchInput < 1
+                    || pchInput[0] != '.'
+                    || (cchInput == 2 && pchInput[1] != '.') )
+                    return VINF_SUCCESS;
+                return VERR_MISMATCH;
+
+            case RTPATHMATCHOP_STRCMP:
+                if (pProg->cch > cchInput)
+                    return VERR_MISMATCH;
+                if (memcmp(pchInput, pProg->pch, pProg->cch) != 0)
+                    return VERR_MISMATCH;
+                cchInput -= pProg->cch;
+                pchInput += pProg->cch;
+                break;
+
+            case RTPATHMATCHOP_STRICMP:
+                if (pProg->cch > cchInput)
+                    return VERR_MISMATCH;
+                if (RTStrNICmp(pchInput, pProg->pch, pProg->cch) != 0)
+                    return VERR_MISMATCH;
+                cchInput -= pProg->cch;
+                pchInput += pProg->cch;
+                break;
+
+            case RTPATHMATCHOP_SKIP_ONE_CODEPOINT:
+            {
+                if (cchInput == 0)
+                    return VERR_MISMATCH;
+                RTUNICP ucInputIgnore;
+                int rc = RTStrGetCpNEx(&pchInput, &cchInput, &ucInputIgnore);
+                AssertRCReturn(rc, rc);
+                break;
+            }
+
+            case RTPATHMATCHOP_SKIP_MULTIPLE_CODEPOINTS:
+            {
+                uint16_t cCpsLeft = pProg->cch;
+                Assert(cCpsLeft > 1);
+                if (cCpsLeft > cchInput)
+                    return VERR_MISMATCH;
+                while (cCpsLeft-- > 0)
+                {
+                    RTUNICP ucInputIgnore;
+                    int rc = RTStrGetCpNEx(&pchInput, &cchInput, &ucInputIgnore);
+                    if (RT_FAILURE(rc))
+                        return rc == VERR_END_OF_STRING ? VERR_MISMATCH : rc;
+                }
+                break;
+            }
+
+            case RTPATHMATCHOP_CODEPOINT_IN_SET_ASCII7:
+            {
+                if (cchInput == 0)
+                    return VERR_MISMATCH;
+                RTUNICP ucInput;
+                int rc = RTStrGetCpNEx(&pchInput, &cchInput, &ucInput);
+                AssertRCReturn(rc, rc);
+                if (ucInput >= 0x80)
+                    return VERR_MISMATCH;
+                if (memchr(pProg->pch, (char)ucInput, pProg->cch) == NULL)
+                    return VERR_MISMATCH;
+                break;
+            }
+
+            case RTPATHMATCHOP_CODEPOINT_NOT_IN_SET_ASCII7:
+            {
+                if (cchInput == 0)
+                    return VERR_MISMATCH;
+                RTUNICP ucInput;
+                int rc = RTStrGetCpNEx(&pchInput, &cchInput, &ucInput);
+                AssertRCReturn(rc, rc);
+                if (ucInput >= 0x80)
+                    break;
+                if (memchr(pProg->pch, (char)ucInput, pProg->cch) != NULL)
+                    return VERR_MISMATCH;
+                break;
+            }
+
+            case RTPATHMATCHOP_CODEPOINT_IN_SET_EXTENDED:
+            {
+                if (cchInput == 0)
+                    return VERR_MISMATCH;
+                RTUNICP ucInput;
+                int rc = RTStrGetCpNEx(&pchInput, &cchInput, &ucInput);
+                AssertRCReturn(rc, rc);
+                rc = rtPathMatchExecExtendedSet(ucInput, pProg->pch, pProg->cch);
+                if (rc == VINF_SUCCESS)
+                    break;
+                return rc;
+            }
+
+            case RTPATHMATCHOP_CODEPOINT_NOT_IN_SET_EXTENDED:
+            {
+                if (cchInput == 0)
+                    return VERR_MISMATCH;
+                RTUNICP ucInput;
+                int rc = RTStrGetCpNEx(&pchInput, &cchInput, &ucInput);
+                AssertRCReturn(rc, rc);
+                rc = rtPathMatchExecExtendedSet(ucInput, pProg->pch, pProg->cch);
+                if (rc == VERR_MISMATCH)
+                    break;
+                if (rc == VINF_SUCCESS)
+                    rc = VERR_MISMATCH;
+                return rc;
+            }
+
+            case RTPATHMATCHOP_VARIABLE_VALUE_CMP:
+            case RTPATHMATCHOP_VARIABLE_VALUE_ICMP:
+            {
+                size_t cchMatched = 0;
+                int rc = rtPathMatchExecVariable(pchInput, cchInput, pProg->uOp2,
+                                                 pProg->enmOpCode == RTPATHMATCHOP_VARIABLE_VALUE_ICMP, &cchMatched, pCache);
+                if (rc == VINF_SUCCESS)
+                {
+                    pchInput += cchMatched;
+                    cchInput -= cchMatched;
+                    break;
+                }
+                return rc;
+            }
+
+            /*
+             * This is the expensive one. It always completes the program.
+             */
+            case RTPATHMATCHOP_ZERO_OR_MORE:
+            {
+                if (cchInput < pProg->cch)
+                    return VERR_MISMATCH;
+                size_t cchMatched = cchInput - pProg->cch;
+                do
+                {
+                    int rc = rtPathMatchExec(&pchInput[cchMatched], cchInput - cchMatched, pProg + 1, pCache);
+                    if (RT_SUCCESS(rc))
+                        return rc;
+                } while (cchMatched-- > 0);
+                return VERR_MISMATCH;
+            }
+
+            /*
+             * Variant of the above that doesn't match '.' and '..' entries.
+             */
+            case RTPATHMATCHOP_ZERO_OR_MORE_EXCEPT_DOT_AND_DOTDOT:
+            {
+                if (cchInput < pProg->cch)
+                    return VERR_MISMATCH;
+                if (   cchInput <= 2
+                    && cchInput > 0
+                    && pchInput[0] == '.'
+                    && (cchInput == 1 || pchInput[1] == '.') )
+                    return VERR_MISMATCH;
+                size_t cchMatched = cchInput - pProg->cch;
+                do
+                {
+                    int rc = rtPathMatchExec(&pchInput[cchMatched], cchInput - cchMatched, pProg + 1, pCache);
+                    if (RT_SUCCESS(rc))
+                        return rc;
+                } while (cchMatched-- > 0);
+                return VERR_MISMATCH;
+            }
+
+            default:
+                AssertMsgFailedReturn(("enmOpCode=%d\n", pProg->enmOpCode), VERR_INTERNAL_ERROR_3);
+        }
+
+        pProg++;
+    }
+}
+
+
+
+
+/**
+ * Compiles a path matching program.
+ *
+ * @returns IPRT status code.
+ * @param   pchPattern          The pattern to compile.
+ * @param   cchPattern          The length of the pattern.
+ * @param   fIgnoreCase         Whether to ignore case or not when doing the
+ *                              actual matching later on.
+ * @param   pAllocator          Pointer to the instruction allocator & result
+ *                              array.  The compiled "program" starts at
+ *                              PRTPATHMATCHALLOC::paInstructions[PRTPATHMATCHALLOC::iNext]
+ *                              (input iNext value).
+ *
+ * @todo Expose this matching code and also use it for RTDirOpenFiltered
+ */
+static int rtPathMatchCompile(const char *pchPattern, size_t cchPattern, bool fIgnoreCase, PRTPATHMATCHALLOC pAllocator)
+{
+    /** @todo PORTME: big endian. */
+    static const uint8_t s_bmMetaChars[256/8] =
+    {
+        0x00, 0x00, 0x00, 0x00, /*  0 thru 31 */
+        0x10, 0x04, 0x00, 0x80, /* 32 thru 63 */
+        0x00, 0x00, 0x00, 0x08, /* 64 thru 95 */
+        0x00, 0x00, 0x00, 0x00, /* 96 thru 127 */
+        /* UTF-8 multibyte: */
+        0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00,
+    };
+    Assert(ASMBitTest(s_bmMetaChars, '$')); AssertCompile('$' == 0x24 /*36*/);
+    Assert(ASMBitTest(s_bmMetaChars, '*')); AssertCompile('*' == 0x2a /*42*/);
+    Assert(ASMBitTest(s_bmMetaChars, '?')); AssertCompile('?' == 0x3f /*63*/);
+    Assert(ASMBitTest(s_bmMetaChars, '[')); AssertCompile('[' == 0x5b /*91*/);
+
+    /*
+     * For checking for the first instruction.
+     */
+    uint16_t const iFirst = pAllocator->iNext;
+
+    /*
+     * This is for tracking zero-or-more instructions and for calculating
+     * the minimum amount of input required for it to be considered.
+     */
+    uint16_t aiZeroOrMore[RTPATHMATCH_MAX_ZERO_OR_MORE];
+    uint8_t  cZeroOrMore = 0;
+    size_t   offInput    = 0;
+
+    /*
+     * Loop thru the pattern and translate it into string matching instructions.
+     */
+    for (;;)
+    {
+        /*
+         * Allocate the next instruction.
+         */
+        if (pAllocator->iNext >= pAllocator->cAllocated)
+        {
+            uint32_t cNew = pAllocator->cAllocated ? pAllocator->cAllocated * 2 : 2;
+            void *pvNew = RTMemRealloc(pAllocator->paInstructions, cNew * sizeof(pAllocator->paInstructions[0]));
+            AssertReturn(pvNew, VERR_NO_MEMORY);
+            pAllocator->paInstructions = (PRTPATHMATCHCORE)pvNew;
+            pAllocator->cAllocated     = cNew;
+        }
+        PRTPATHMATCHCORE pInstr = &pAllocator->paInstructions[pAllocator->iNext++];
+        pInstr->pch  = pchPattern;
+        pInstr->cch  = 0;
+        pInstr->uOp2 = 0;
+
+        /*
+         * Special case: End of pattern.
+         */
+        if (!cchPattern)
+        {
+            pInstr->enmOpCode = RTPATHMATCHOP_RETURN_MATCH_IF_AT_END;
+            break;
+        }
+
+        /*
+         * Parse the next bit of the pattern.
+         */
+        char ch = *pchPattern;
+        if (ASMBitTest(s_bmMetaChars, (uint8_t)ch))
+        {
+            /*
+             * Zero or more characters wildcard.
+             */
+            if (ch == '*')
+            {
+                /* Skip extra asterisks. */
+                do
+                {
+                    cchPattern--;
+                    pchPattern++;
+                } while (cchPattern > 0 && *pchPattern == '*');
+
+                /* There is a special optimization for trailing '*'. */
+                pInstr->cch = 1;
+                if (cchPattern == 0)
+                {
+                    pInstr->enmOpCode = iFirst + 1U == pAllocator->iNext
+                                      ? RTPATHMATCHOP_RETURN_MATCH_EXCEPT_DOT_AND_DOTDOT : RTPATHMATCHOP_RETURN_MATCH;
+                    break;
+                }
+
+                pInstr->enmOpCode = iFirst + 1U == pAllocator->iNext
+                                  ? RTPATHMATCHOP_ZERO_OR_MORE_EXCEPT_DOT_AND_DOTDOT : RTPATHMATCHOP_ZERO_OR_MORE;
+                pInstr->uOp2      = (uint16_t)offInput;
+                AssertReturn(cZeroOrMore < RT_ELEMENTS(aiZeroOrMore), VERR_OUT_OF_RANGE);
+                aiZeroOrMore[cZeroOrMore] = (uint16_t)(pInstr - pAllocator->paInstructions);
+
+                /* cchInput unchanged, zero-or-more matches. */
+                continue;
+            }
+
+            /*
+             * Single character wildcard.
+             */
+            if (ch == '?')
+            {
+                /* Count them if more. */
+                uint16_t cchQms = 1;
+                while (cchQms < cchPattern && pchPattern[cchQms] == '?')
+                    cchQms++;
+
+                pInstr->cch = cchQms;
+                pInstr->enmOpCode = cchQms == 1 ? RTPATHMATCHOP_SKIP_ONE_CODEPOINT : RTPATHMATCHOP_SKIP_MULTIPLE_CODEPOINTS;
+
+                cchPattern -= cchQms;
+                pchPattern += cchQms;
+                offInput   += cchQms;
+                continue;
+            }
+
+            /*
+             * Character in set.
+             *
+             * Note that we skip the first char in the set as that is the only place
+             * ']' can be placed if one desires to explicitly include it in the set.
+             * To make life a bit more interesting, [:class:] is allowed inside the
+             * set, so we have to do the counting game to find the end.
+             */
+            if (ch == '[')
+            {
+                if (   cchPattern > 2
+                    && (const char *)memchr(pchPattern + 2, ']', cchPattern) != NULL)
+                {
+
+                    /* Check for not-in. */
+                    bool   fInverted = false;
+                    size_t offStart  = 1;
+                    if (pchPattern[offStart] == '^')
+                    {
+                        fInverted = true;
+                        offStart++;
+                    }
+
+                    /* Special case for ']' as the first char, it doesn't indicate closing then. */
+                    size_t off = offStart;
+                    if (pchPattern[off] == ']')
+                        off++;
+
+                    bool fExtended = false;
+                    while (off < cchPattern)
+                    {
+                        ch = pchPattern[off++];
+                        if (ch == '[')
+                        {
+                            if (off < cchPattern)
+                            {
+                                char chOpen = pchPattern[off];
+                                if (   chOpen == ':'
+                                    || chOpen == '='
+                                    || chOpen == '.')
+                                {
+                                    off++;
+                                    const char *pchFound = (const char *)memchr(&pchPattern[off], ']', cchPattern - off);
+                                    if (   pchFound
+                                        && pchFound[-1] == chOpen)
+                                    {
+                                        fExtended = true;
+                                        off = pchFound - pchPattern + 1;
+                                    }
+                                    else
+                                        AssertFailed();
+                                }
+                            }
+                        }
+                        /* Check for closing. */
+                        else if (ch == ']')
+                            break;
+                        /* Check for range expression, promote to extended if this happens. */
+                        else if (   ch == '-'
+                                 && off != offStart + 1
+                                 && off < cchPattern
+                                 && pchPattern[off] != ']')
+                            fExtended = true;
+                        /* UTF-8 multibyte chars forces us to use the extended version too. */
+                        else if ((uint8_t)ch >= 0x80)
+                            fExtended = true;
+                    }
+
+                    if (ch == ']')
+                    {
+                        pInstr->pch = &pchPattern[offStart];
+                        pInstr->cch = (uint16_t)(off - offStart - 1);
+                        if (!fExtended)
+                            pInstr->enmOpCode = !fInverted
+                                              ? RTPATHMATCHOP_CODEPOINT_IN_SET_ASCII7 : RTPATHMATCHOP_CODEPOINT_NOT_IN_SET_ASCII7;
+                        else
+                            pInstr->enmOpCode = !fInverted
+                                              ? RTPATHMATCHOP_CODEPOINT_IN_SET_EXTENDED
+                                              : RTPATHMATCHOP_CODEPOINT_NOT_IN_SET_EXTENDED;
+                        pchPattern += off;
+                        cchPattern -= off;
+                        offInput   += 1;
+                        continue;
+                    }
+
+                    /* else: invalid, treat it as */
+                    AssertFailed();
+                }
+            }
+            /*
+             * Variable matching.
+             */
+            else if (ch == '$')
+            {
+                const char *pchFound;
+                if (   cchPattern > 3
+                    && pchPattern[1] == '{'
+                    && (pchFound = (const char *)memchr(pchPattern + 2, '}', cchPattern)) != NULL
+                    && pchFound != &pchPattern[2])
+                {
+                    /* skip to the variable name. */
+                    pchPattern += 2;
+                    cchPattern -= 2;
+                    size_t cchVarNm = pchFound - pchPattern;
+
+                    /* Look it up. */
+                    uint32_t iVar;
+                    for (iVar = 0; iVar < RT_ELEMENTS(g_aVariables); iVar++)
+                        if (   g_aVariables[iVar].cchName == cchVarNm
+                            && memcmp(g_aVariables[iVar].pszName, pchPattern, cchVarNm) == 0)
+                            break;
+                    if (iVar < RT_ELEMENTS(g_aVariables))
+                    {
+                        pInstr->uOp2      = (uint16_t)iVar;
+                        pInstr->enmOpCode = !fIgnoreCase ? RTPATHMATCHOP_VARIABLE_VALUE_CMP : RTPATHMATCHOP_VARIABLE_VALUE_ICMP;
+                        pInstr->pch       = pchPattern;             /* not necessary */
+                        pInstr->cch       = (uint16_t)cchPattern;   /* ditto */
+                        pchPattern += cchVarNm + 1;
+                        cchPattern -= cchVarNm + 1;
+                        AssertMsgReturn(!g_aVariables[iVar].fFirstOnly || iFirst + 1U == pAllocator->iNext,
+                                        ("Glob variable '%s' should be first\n", g_aVariables[iVar].pszName),
+                                        VERR_PATH_MATCH_VARIABLE_MUST_BE_FIRST);
+                        /* cchInput unchanged, value can be empty. */
+                        continue;
+                    }
+                    AssertMsgFailedReturn(("Unknown path matching variable '%.*s'\n", cchVarNm, pchPattern),
+                                          VERR_PATH_MATCH_UNKNOWN_VARIABLE);
+                }
+            }
+            else
+                AssertFailedReturn(VERR_INTERNAL_ERROR_2); /* broken bitmap / compiler codeset */
+        }
+
+        /*
+         * Plain text.  Look for the next meta char.
+         */
+        uint32_t cchPlain = 1;
+        while (cchPlain < cchPattern)
+        {
+            ch = pchPattern[cchPlain];
+            if (!ASMBitTest(s_bmMetaChars, (uint8_t)ch))
+            { /* probable */ }
+            else if (   ch == '?'
+                     || ch == '*')
+                break;
+            else if (ch == '$')
+            {
+                const char *pchFound;
+                if (   cchPattern > cchPlain + 3
+                    && pchPattern[cchPlain + 1] == '{'
+                    && (pchFound = (const char *)memchr(&pchPattern[cchPlain + 2], '}', cchPattern - cchPlain - 2)) != NULL
+                    && pchFound != &pchPattern[cchPlain + 2])
+                break;
+            }
+            else if (ch == '[')
+            {
+                /* We don't put a lot of effort into getting this 100% right here,
+                   no point it complicating things for malformed expressions. */
+                if (   cchPattern > cchPlain + 2
+                    && memchr(&pchPattern[cchPlain + 2], ']', cchPattern - cchPlain - 1) != NULL)
+                    break;
+            }
+            else
+                AssertFailedReturn(VERR_INTERNAL_ERROR_2); /* broken bitmap / compiler codeset */
+            cchPlain++;
+        }
+        pInstr->enmOpCode = !fIgnoreCase ? RTPATHMATCHOP_STRCMP : RTPATHMATCHOP_STRICMP;
+        pInstr->cch       = cchPlain;
+        Assert(pInstr->pch == pchPattern);
+        Assert(pInstr->uOp2 == 0);
+        pchPattern += cchPlain;
+        cchPattern -= cchPlain;
+        offInput   += cchPlain;
+    }
+
+    /*
+     * Optimize zero-or-more matching.
+     */
+    while (cZeroOrMore-- > 0)
+    {
+        PRTPATHMATCHCORE pInstr = &pAllocator->paInstructions[aiZeroOrMore[cZeroOrMore]];
+        pInstr->uOp2 = (uint16_t)(offInput - pInstr->uOp2);
+    }
+
+    /** @todo It's possible to use offInput to inject a instruction for checking
+     *        minimum input length at the start of the program.  Not sure it's
+     *        worth it though, unless it's long a complicated expression... */
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Parses the glob pattern.
+ *
+ * This compiles filename matching programs for each component and determins the
+ * optimal search strategy for them.
+ *
+ * @returns IPRT status code.
+ * @param   pGlob               The glob instance data.
+ * @param   pszPattern          The pattern to parse.
+ * @param   pParsed             The RTPathParse output for the pattern.
+ * @param   fFlags              The glob flags (same as pGlob->fFlags).
+ */
+static int rtPathGlobParse(PRTPATHGLOB pGlob, const char *pszPattern, PRTPATHPARSED pParsed, uint32_t fFlags)
+{
+    AssertReturn(pParsed->cComps > 0, VERR_INVALID_PARAMETER); /* shouldn't happen */
+    uint32_t iComp = 0;
+
+    /*
+     * If we've got a rootspec, mark it as plain.  On platforms with
+     * drive letter and/or UNC we don't allow wildcards or such in
+     * the drive letter spec or UNC server name.  (At least not yet.)
+     */
+    if (RTPATH_PROP_HAS_ROOT_SPEC(pParsed->fProps))
+    {
+        AssertReturn(pParsed->aComps[0].cch < sizeof(pGlob->szPath) - 1, VERR_FILENAME_TOO_LONG);
+        memcpy(pGlob->szPath, &pszPattern[pParsed->aComps[0].off], pParsed->aComps[0].cch);
+        pGlob->offFirstPath = pParsed->aComps[0].cch;
+        pGlob->iFirstComp   = iComp = 1;
+    }
+    else
+    {
+        const char * const pszComp = &pszPattern[pParsed->aComps[0].off];
+
+        /*
+         * The tilde is only applicable to the first component, expand it
+         * immediately.
+         */
+        if (   *pszComp == '~'
+            && !(fFlags & RTPATHGLOB_F_NO_TILDE))
+        {
+            if (pParsed->aComps[0].cch == 1)
+            {
+                int rc = RTPathUserHome(pGlob->szPath, sizeof(pGlob->szPath) - 1);
+                AssertRCReturn(rc, rc);
+            }
+            else
+                AssertMsgFailedReturn(("'%.*s' is not supported yet\n", pszComp, pParsed->aComps[0].cch),
+                                      VERR_PATH_MATCH_FEATURE_NOT_IMPLEMENTED);
+            pGlob->offFirstPath = (uint16_t)RTPathEnsureTrailingSeparator(pGlob->szPath, sizeof(pGlob->szPath));
+            pGlob->iFirstComp   = iComp = 1;
+        }
+    }
+
+    /*
+     * Process the other components.
+     */
+    bool fStarStar = false;
+    for (; iComp < pParsed->cComps; iComp++)
+    {
+        const char *pszComp = &pszPattern[pParsed->aComps[iComp].off];
+        uint16_t    cchComp = pParsed->aComps[iComp].cch;
+        Assert(pGlob->aComps[iComp].fNormal == false);
+
+        pGlob->aComps[iComp].fDir = iComp + 1 < pParsed->cComps || (fFlags & RTPATHGLOB_F_ONLY_DIRS);
+        if (   cchComp != 2
+            || pszComp[0] != '*'
+            || pszComp[1] != '*'
+            || (fFlags & RTPATHGLOB_F_NO_STARSTAR) )
+        {
+            /* Compile the pattern. */
+            uint16_t const iMatchProg = pGlob->MatchInstrAlloc.iNext;
+            pGlob->aComps[iComp].iMatchProg = iMatchProg;
+            int rc = rtPathMatchCompile(pszComp, cchComp, RT_BOOL(fFlags & RTPATHGLOB_F_IGNORE_CASE),
+                                        &pGlob->MatchInstrAlloc);
+            if (RT_FAILURE(rc))
+                return rc;
+
+            /* Check for plain text as well as full variable matching (not applicable after '**'). */
+            uint16_t const cInstructions = pGlob->MatchInstrAlloc.iNext - iMatchProg;
+            if (   cInstructions == 2
+                && !fStarStar
+                && pGlob->MatchInstrAlloc.paInstructions[iMatchProg + 1].enmOpCode == RTPATHMATCHOP_RETURN_MATCH_IF_AT_END)
+            {
+                if (   pGlob->MatchInstrAlloc.paInstructions[iMatchProg].enmOpCode == RTPATHMATCHOP_STRCMP
+                    || pGlob->MatchInstrAlloc.paInstructions[iMatchProg].enmOpCode == RTPATHMATCHOP_STRICMP)
+                    pGlob->aComps[iComp].fPlain  = true;
+                else if (   pGlob->MatchInstrAlloc.paInstructions[iMatchProg].enmOpCode == RTPATHMATCHOP_VARIABLE_VALUE_CMP
+                         || pGlob->MatchInstrAlloc.paInstructions[iMatchProg].enmOpCode == RTPATHMATCHOP_VARIABLE_VALUE_ICMP)
+                {
+                    pGlob->aComps[iComp].fExpVariable = true;
+                    AssertMsgReturn(   iComp == 0
+                                    || !g_aVariables[pGlob->MatchInstrAlloc.paInstructions[iMatchProg].uOp2].fFirstOnly,
+                                    ("Glob variable '%.*s' can only be used as the path component.\n",  cchComp, pszComp),
+                                    VERR_PATH_MATCH_VARIABLE_MUST_BE_FIRST);
+                }
+                else
+                    pGlob->aComps[iComp].fNormal = true;
+            }
+            else
+                pGlob->aComps[iComp].fNormal = true;
+        }
+        else
+        {
+            /* Recursive "**" matching. */
+            pGlob->aComps[iComp].fNormal   = false;
+            pGlob->aComps[iComp].fStarStar = true;
+            AssertReturn(!fStarStar, VERR_PATH_MATCH_FEATURE_NOT_IMPLEMENTED); /** @todo implement multiple '**' sequences in a pattern. */
+            fStarStar = true;
+        }
+    }
+    pGlob->aComps[pParsed->cComps - 1].fFinal = true;
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * This is for skipping overly long directories entries.
+ *
+ * Since our directory entry buffer can hold filenames of RTPATH_MAX bytes, we
+ * can safely skip filenames that are longer.  There are very few file systems
+ * that can actually store filenames longer than 255 bytes at time of coding
+ * (2015-09), and extremely few which can exceed 4096 (RTPATH_MAX) bytes.
+ *
+ * @returns IPRT status code.
+ * @param   hDir        The directory handle.
+ * @param   cbNeeded    The required entry size.
+ */
+DECL_NO_INLINE(static, int) rtPathGlobSkipDirEntry(RTDIR hDir, size_t cbNeeded)
+{
+    int rc = VERR_BUFFER_OVERFLOW;
+    cbNeeded = RT_ALIGN_Z(cbNeeded, 16);
+    PRTDIRENTRY pDirEntry = (PRTDIRENTRY)RTMemTmpAlloc(cbNeeded);
+    if (pDirEntry)
+    {
+        rc = RTDirRead(hDir, pDirEntry, &cbNeeded);
+        RTMemTmpFree(pDirEntry);
+    }
+    return rc;
+}
+
+
+/**
+ * Adds a result.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_CALLBACK_RETURN if we can stop searching.
+ *
+ * @param   pGlob       The glob instance data.
+ * @param   cchPath     The number of bytes to add from pGlob->szPath.
+ * @param   uType       The RTDIRENTRYTYPE value.
+ */
+DECL_NO_INLINE(static, int) rtPathGlobAddResult(PRTPATHGLOB pGlob, size_t cchPath, uint8_t uType)
+{
+    if (pGlob->cResults < RTPATHGLOB_MAX_RESULTS)
+    {
+        PRTPATHGLOBENTRY pEntry = (PRTPATHGLOBENTRY)RTMemAlloc(RT_UOFFSETOF_DYN(RTPATHGLOBENTRY, szPath[cchPath + 1]));
+        if (pEntry)
+        {
+            pEntry->uType   = uType;
+            pEntry->cchPath = (uint16_t)cchPath;
+            memcpy(pEntry->szPath, pGlob->szPath, cchPath);
+            pEntry->szPath[cchPath] = '\0';
+
+            pEntry->pNext  = NULL;
+            *pGlob->ppNext = pEntry;
+            pGlob->ppNext  = &pEntry->pNext;
+            pGlob->cResults++;
+
+            if (!(pGlob->fFlags & RTPATHGLOB_F_FIRST_ONLY))
+                return VINF_SUCCESS;
+            return VINF_CALLBACK_RETURN;
+        }
+        return VERR_NO_MEMORY;
+    }
+    return VERR_TOO_MUCH_DATA;
+}
+
+
+/**
+ * Adds a result, constructing the path from two string.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_CALLBACK_RETURN if we can stop searching.
+ *
+ * @param   pGlob       The glob instance data.
+ * @param   cchPath     The number of bytes to add from pGlob->szPath.
+ * @param   pchName     The string (usual filename) to append to the szPath.
+ * @param   cchName     The length of the string to append.
+ * @param   uType       The RTDIRENTRYTYPE value.
+ */
+DECL_NO_INLINE(static, int) rtPathGlobAddResult2(PRTPATHGLOB pGlob, size_t cchPath, const char *pchName, size_t cchName,
+                                                 uint8_t uType)
+{
+    if (pGlob->cResults < RTPATHGLOB_MAX_RESULTS)
+    {
+        PRTPATHGLOBENTRY pEntry = (PRTPATHGLOBENTRY)RTMemAlloc(RT_UOFFSETOF_DYN(RTPATHGLOBENTRY, szPath[cchPath + cchName + 1]));
+        if (pEntry)
+        {
+            pEntry->uType   = uType;
+            pEntry->cchPath = (uint16_t)(cchPath + cchName);
+            memcpy(pEntry->szPath, pGlob->szPath, cchPath);
+            memcpy(&pEntry->szPath[cchPath], pchName, cchName);
+            pEntry->szPath[cchPath + cchName] = '\0';
+
+            pEntry->pNext  = NULL;
+            *pGlob->ppNext = pEntry;
+            pGlob->ppNext  = &pEntry->pNext;
+            pGlob->cResults++;
+
+            if (!(pGlob->fFlags & RTPATHGLOB_F_FIRST_ONLY))
+                return VINF_SUCCESS;
+            return VINF_CALLBACK_RETURN;
+        }
+        return VERR_NO_MEMORY;
+    }
+    return VERR_TOO_MUCH_DATA;
+}
+
+
+/**
+ * Prepares a result, constructing the path from two string.
+ *
+ * The caller must call either rtPathGlobCommitResult or
+ * rtPathGlobRollbackResult to complete the operation.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_CALLBACK_RETURN if we can stop searching.
+ *
+ * @param   pGlob       The glob instance data.
+ * @param   cchPath     The number of bytes to add from pGlob->szPath.
+ * @param   pchName     The string (usual filename) to append to the szPath.
+ * @param   cchName     The length of the string to append.
+ * @param   uType       The RTDIRENTRYTYPE value.
+ */
+DECL_NO_INLINE(static, int) rtPathGlobAlmostAddResult(PRTPATHGLOB pGlob, size_t cchPath, const char *pchName, size_t cchName,
+                                                      uint8_t uType)
+{
+    if (pGlob->cResults < RTPATHGLOB_MAX_RESULTS)
+    {
+        PRTPATHGLOBENTRY pEntry = (PRTPATHGLOBENTRY)RTMemAlloc(RT_UOFFSETOF_DYN(RTPATHGLOBENTRY, szPath[cchPath + cchName + 1]));
+        if (pEntry)
+        {
+            pEntry->uType   = uType;
+            pEntry->cchPath = (uint16_t)(cchPath + cchName);
+            memcpy(pEntry->szPath, pGlob->szPath, cchPath);
+            memcpy(&pEntry->szPath[cchPath], pchName, cchName);
+            pEntry->szPath[cchPath + cchName] = '\0';
+
+            pEntry->pNext  = NULL;
+            *pGlob->ppNext = pEntry;
+            /* Note! We don't update ppNext here, that is done in rtPathGlobCommitResult. */
+
+            if (!(pGlob->fFlags & RTPATHGLOB_F_FIRST_ONLY))
+                return VINF_SUCCESS;
+            return VINF_CALLBACK_RETURN;
+        }
+        return VERR_NO_MEMORY;
+    }
+    return VERR_TOO_MUCH_DATA;
+}
+
+
+/**
+ * Commits a pending result from rtPathGlobAlmostAddResult.
+ *
+ * @param   pGlob       The glob instance data.
+ * @param   uType       The RTDIRENTRYTYPE value.
+ */
+static void rtPathGlobCommitResult(PRTPATHGLOB pGlob, uint8_t uType)
+{
+    PRTPATHGLOBENTRY pEntry = *pGlob->ppNext;
+    AssertPtr(pEntry);
+    pEntry->uType = uType;
+    pGlob->ppNext = &pEntry->pNext;
+    pGlob->cResults++;
+}
+
+
+/**
+ * Rolls back a pending result from rtPathGlobAlmostAddResult.
+ *
+ * @param   pGlob       The glob instance data.
+ */
+static void rtPathGlobRollbackResult(PRTPATHGLOB pGlob)
+{
+    PRTPATHGLOBENTRY pEntry = *pGlob->ppNext;
+    AssertPtr(pEntry);
+    RTMemFree(pEntry);
+    *pGlob->ppNext = NULL;
+}
+
+
+
+/**
+ * Whether to call rtPathGlobExecRecursiveVarExp for the next component.
+ *
+ * @returns true / false.
+ * @param   pGlob       The glob instance data.
+ * @param   offPath     The next path offset/length.
+ * @param   iComp       The next component.
+ */
+DECLINLINE(bool) rtPathGlobExecIsExpVar(PRTPATHGLOB pGlob, size_t offPath, uint32_t iComp)
+{
+    return pGlob->aComps[iComp].fExpVariable
+        && (  !(pGlob->fFlags & RTPATHGLOB_F_IGNORE_CASE)
+            || (offPath ? !RTFsIsCaseSensitive(pGlob->szPath) : !RTFsIsCaseSensitive(".")) );
+}
+
+/**
+ * Whether to call rtPathGlobExecRecursivePlainText for the next component.
+ *
+ * @returns true / false.
+ * @param   pGlob       The glob instance data.
+ * @param   offPath     The next path offset/length.
+ * @param   iComp       The next component.
+ */
+DECLINLINE(bool) rtPathGlobExecIsPlainText(PRTPATHGLOB pGlob, size_t offPath, uint32_t iComp)
+{
+    return pGlob->aComps[iComp].fPlain
+        && (  !(pGlob->fFlags & RTPATHGLOB_F_IGNORE_CASE)
+            || (offPath ? !RTFsIsCaseSensitive(pGlob->szPath) : !RTFsIsCaseSensitive(".")) );
+}
+
+
+/**
+ * Helper for rtPathGlobExecRecursiveVarExp and rtPathGlobExecRecursivePlainText
+ * that compares a file mode mask with dir/no-dir wishes of the caller.
+ *
+ * @returns true if match, false if not.
+ * @param   pGlob       The glob instance data.
+ * @param   fMode       The file mode (only the type is used).
+ */
+DECLINLINE(bool) rtPathGlobExecIsMatchFinalWithFileMode(PRTPATHGLOB pGlob, RTFMODE fMode)
+{
+    if (!(pGlob->fFlags & (RTPATHGLOB_F_NO_DIRS | RTPATHGLOB_F_ONLY_DIRS)))
+        return true;
+    return RT_BOOL(pGlob->fFlags & RTPATHGLOB_F_ONLY_DIRS) == RTFS_IS_DIRECTORY(fMode);
+}
+
+
+/**
+ * Recursive globbing - star-star mode.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_CALLBACK_RETURN is used to implement RTPATHGLOB_F_FIRST_ONLY.
+ *
+ * @param   pGlob               The glob instance data.
+ * @param   offPath             The current path offset/length.
+ * @param   iStarStarComp       The star-star component index.
+ * @param   offStarStarPath     The offset of the star-star component in the
+ *                              pattern path.
+ */
+DECL_NO_INLINE(static, int) rtPathGlobExecRecursiveStarStar(PRTPATHGLOB pGlob, size_t offPath, uint32_t iStarStarComp,
+                                                            size_t offStarStarPath)
+{
+    /** @todo implement multi subdir matching. */
+    RT_NOREF_PV(pGlob);
+    RT_NOREF_PV(offPath);
+    RT_NOREF_PV(iStarStarComp);
+    RT_NOREF_PV(offStarStarPath);
+    return VERR_PATH_MATCH_FEATURE_NOT_IMPLEMENTED;
+}
+
+
+
+/**
+ * Recursive globbing - variable expansion optimization.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_CALLBACK_RETURN is used to implement RTPATHGLOB_F_FIRST_ONLY.
+ *
+ * @param   pGlob               The glob instance data.
+ * @param   offPath             The current path offset/length.
+ * @param   iComp               The current component.
+ */
+DECL_NO_INLINE(static, int) rtPathGlobExecRecursiveVarExp(PRTPATHGLOB pGlob, size_t offPath, uint32_t iComp)
+{
+    Assert(iComp < pGlob->pParsed->cComps);
+    Assert(pGlob->szPath[offPath] == '\0');
+    Assert(pGlob->aComps[iComp].fExpVariable);
+    Assert(!pGlob->aComps[iComp].fPlain);
+    Assert(!pGlob->aComps[iComp].fStarStar);
+    Assert(rtPathGlobExecIsExpVar(pGlob, offPath, iComp));
+
+    /*
+     * Fish the variable index out of the first matching instruction.
+     */
+    Assert(      pGlob->MatchInstrAlloc.paInstructions[pGlob->aComps[iComp].iMatchProg].enmOpCode
+              == RTPATHMATCHOP_VARIABLE_VALUE_CMP
+           ||   pGlob->MatchInstrAlloc.paInstructions[pGlob->aComps[iComp].iMatchProg].enmOpCode
+              == RTPATHMATCHOP_VARIABLE_VALUE_ICMP);
+    uint16_t const iVar = pGlob->MatchInstrAlloc.paInstructions[pGlob->aComps[iComp].iMatchProg].uOp2;
+
+    /*
+     * Enumerate all the variable, giving them the plain text treatment.
+     */
+    for (uint32_t iItem = 0; iItem < RTPATHMATCH_MAX_VAR_ITEMS; iItem++)
+    {
+        size_t cch;
+        int rcVar = g_aVariables[iVar].pfnQuery(iItem, &pGlob->szPath[offPath], sizeof(pGlob->szPath) - offPath, &cch,
+                                                &pGlob->MatchCache);
+        if (RT_SUCCESS(rcVar))
+        {
+            Assert(pGlob->szPath[offPath + cch] == '\0');
+
+            int rc = RTPathQueryInfoEx(pGlob->szPath, &pGlob->u.ObjInfo, RTFSOBJATTRADD_NOTHING, RTPATH_F_FOLLOW_LINK);
+            if (RT_SUCCESS(rc))
+            {
+                if (pGlob->aComps[iComp].fFinal)
+                {
+                    if (rtPathGlobExecIsMatchFinalWithFileMode(pGlob, pGlob->u.ObjInfo.Attr.fMode))
+                    {
+                        rc = rtPathGlobAddResult(pGlob, cch,
+                                                 (pGlob->u.ObjInfo.Attr.fMode & RTFS_TYPE_MASK)
+                                                 >> RTFS_TYPE_DIRENTRYTYPE_SHIFT);
+                        if (rc != VINF_SUCCESS)
+                            return rc;
+                    }
+                }
+                else if (RTFS_IS_DIRECTORY(pGlob->u.ObjInfo.Attr.fMode))
+                {
+                    Assert(pGlob->aComps[iComp].fDir);
+                    cch = RTPathEnsureTrailingSeparator(pGlob->szPath, sizeof(pGlob->szPath));
+                    if (cch > 0)
+                    {
+                        if (rtPathGlobExecIsExpVar(pGlob, cch, iComp + 1))
+                            rc = rtPathGlobExecRecursiveVarExp(pGlob, cch, iComp + 1);
+                        else if (rtPathGlobExecIsPlainText(pGlob, cch, iComp + 1))
+                            rc = rtPathGlobExecRecursivePlainText(pGlob, cch, iComp + 1);
+                        else if (pGlob->aComps[pGlob->iFirstComp].fStarStar)
+                            rc = rtPathGlobExecRecursiveStarStar(pGlob, cch, iComp + 1, cch);
+                        else
+                            rc = rtPathGlobExecRecursiveGeneric(pGlob, cch, iComp + 1);
+                        if (rc != VINF_SUCCESS)
+                            return rc;
+                    }
+                    else
+                        pGlob->cPathOverflows++;
+                }
+            }
+            /* else: file doesn't exist or something else is wrong, ignore this. */
+            if (rcVar == VINF_EOF)
+                return VINF_SUCCESS;
+        }
+        else if (rcVar == VERR_EOF)
+            return VINF_SUCCESS;
+        else if (rcVar != VERR_TRY_AGAIN)
+        {
+            Assert(rcVar == VERR_BUFFER_OVERFLOW);
+            pGlob->cPathOverflows++;
+        }
+    }
+    AssertFailedReturn(VINF_SUCCESS); /* Too many items returned, probably buggy query method. */
+}
+
+
+/**
+ * Recursive globbing - plain text optimization.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_CALLBACK_RETURN is used to implement RTPATHGLOB_F_FIRST_ONLY.
+ *
+ * @param   pGlob               The glob instance data.
+ * @param   offPath             The current path offset/length.
+ * @param   iComp               The current component.
+ */
+DECL_NO_INLINE(static, int) rtPathGlobExecRecursivePlainText(PRTPATHGLOB pGlob, size_t offPath, uint32_t iComp)
+{
+    /*
+     * Instead of recursing, we loop thru adjacent plain text components.
+     */
+    for (;;)
+    {
+        /*
+         * Preconditions.
+         */
+        Assert(iComp < pGlob->pParsed->cComps);
+        Assert(pGlob->szPath[offPath] == '\0');
+        Assert(pGlob->aComps[iComp].fPlain);
+        Assert(!pGlob->aComps[iComp].fExpVariable);
+        Assert(!pGlob->aComps[iComp].fStarStar);
+        Assert(rtPathGlobExecIsPlainText(pGlob, offPath, iComp));
+        Assert(pGlob->MatchInstrAlloc.paInstructions[pGlob->aComps[iComp].iMatchProg].enmOpCode
+                  == RTPATHMATCHOP_STRCMP
+               ||   pGlob->MatchInstrAlloc.paInstructions[pGlob->aComps[iComp].iMatchProg].enmOpCode
+                  == RTPATHMATCHOP_STRICMP);
+
+        /*
+         * Add the plain text component to the path.
+         */
+        size_t const cch = pGlob->pParsed->aComps[iComp].cch;
+        if (cch + pGlob->aComps[iComp].fDir < sizeof(pGlob->szPath) - offPath)
+        {
+            memcpy(&pGlob->szPath[offPath], &pGlob->pszPattern[pGlob->pParsed->aComps[iComp].off], cch);
+            offPath += cch;
+            pGlob->szPath[offPath] = '\0';
+
+            /*
+             * Check if it exists.
+             */
+            int rc = RTPathQueryInfoEx(pGlob->szPath, &pGlob->u.ObjInfo, RTFSOBJATTRADD_NOTHING, RTPATH_F_FOLLOW_LINK);
+            if (RT_SUCCESS(rc))
+            {
+                if (pGlob->aComps[iComp].fFinal)
+                {
+                    if (rtPathGlobExecIsMatchFinalWithFileMode(pGlob, pGlob->u.ObjInfo.Attr.fMode))
+                        return rtPathGlobAddResult(pGlob, offPath,
+                                                   (pGlob->u.ObjInfo.Attr.fMode & RTFS_TYPE_MASK)
+                                                   >> RTFS_TYPE_DIRENTRYTYPE_SHIFT);
+                    break;
+                }
+
+                if (RTFS_IS_DIRECTORY(pGlob->u.ObjInfo.Attr.fMode))
+                {
+                    Assert(pGlob->aComps[iComp].fDir);
+                    pGlob->szPath[offPath++] = RTPATH_SLASH;
+                    pGlob->szPath[offPath]   = '\0';
+
+                    iComp++;
+                    if (rtPathGlobExecIsExpVar(pGlob, offPath, iComp))
+                        return rtPathGlobExecRecursiveVarExp(pGlob, offPath, iComp);
+                    if (!rtPathGlobExecIsPlainText(pGlob, offPath, iComp))
+                        return rtPathGlobExecRecursiveGeneric(pGlob, offPath, iComp);
+                    if (pGlob->aComps[pGlob->iFirstComp].fStarStar)
+                        return rtPathGlobExecRecursiveStarStar(pGlob, offPath, iComp, offPath);
+
+                    /* Continue with the next plain text component. */
+                    continue;
+                }
+            }
+            /* else: file doesn't exist or something else is wrong, ignore this. */
+        }
+        else
+            pGlob->cPathOverflows++;
+        break;
+    }
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Recursive globbing - generic.
+ *
+ * @returns IPRT status code.
+ * @retval  VINF_CALLBACK_RETURN is used to implement RTPATHGLOB_F_FIRST_ONLY.
+ *
+ * @param   pGlob               The glob instance data.
+ * @param   offPath             The current path offset/length.
+ * @param   iComp               The current component.
+ */
+DECL_NO_INLINE(static, int) rtPathGlobExecRecursiveGeneric(PRTPATHGLOB pGlob, size_t offPath, uint32_t iComp)
+{
+    /*
+     * Enumerate entire directory and match each entry.
+     */
+    RTDIR hDir;
+    int rc = RTDirOpen(&hDir, offPath ? pGlob->szPath : ".");
+    if (RT_SUCCESS(rc))
+    {
+        for (;;)
+        {
+            size_t cch = sizeof(pGlob->u);
+            rc = RTDirRead(hDir, &pGlob->u.DirEntry, &cch);
+            if (RT_SUCCESS(rc))
+            {
+                if (pGlob->aComps[iComp].fFinal)
+                {
+                    /*
+                     * Final component: Check if it matches the current pattern.
+                     */
+                    if (   !(pGlob->fFlags & (RTPATHGLOB_F_NO_DIRS | RTPATHGLOB_F_ONLY_DIRS))
+                        ||    RT_BOOL(pGlob->fFlags & RTPATHGLOB_F_ONLY_DIRS)
+                           == (pGlob->u.DirEntry.enmType == RTDIRENTRYTYPE_DIRECTORY)
+                        || pGlob->u.DirEntry.enmType == RTDIRENTRYTYPE_UNKNOWN)
+                    {
+                        rc = rtPathMatchExec(pGlob->u.DirEntry.szName, pGlob->u.DirEntry.cbName,
+                                             &pGlob->MatchInstrAlloc.paInstructions[pGlob->aComps[iComp].iMatchProg],
+                                             &pGlob->MatchCache);
+                        if (RT_SUCCESS(rc))
+                        {
+                            /* Construct the result. */
+                            if (   pGlob->u.DirEntry.enmType != RTDIRENTRYTYPE_UNKNOWN
+                                || !(pGlob->fFlags & (RTPATHGLOB_F_NO_DIRS | RTPATHGLOB_F_ONLY_DIRS)) )
+                                rc = rtPathGlobAddResult2(pGlob, offPath, pGlob->u.DirEntry.szName, pGlob->u.DirEntry.cbName,
+                                                          (uint8_t)pGlob->u.DirEntry.enmType);
+                            else
+                            {
+                                rc = rtPathGlobAlmostAddResult(pGlob, offPath,
+                                                               pGlob->u.DirEntry.szName, pGlob->u.DirEntry.cbName,
+                                                               (uint8_t)RTDIRENTRYTYPE_UNKNOWN);
+                                if (RT_SUCCESS(rc))
+                                {
+                                    RTDirQueryUnknownType((*pGlob->ppNext)->szPath, false /*fFollowSymlinks*/,
+                                                          &pGlob->u.DirEntry.enmType);
+                                    if (   RT_BOOL(pGlob->fFlags & RTPATHGLOB_F_ONLY_DIRS)
+                                        == (pGlob->u.DirEntry.enmType == RTDIRENTRYTYPE_DIRECTORY))
+                                        rtPathGlobCommitResult(pGlob, (uint8_t)pGlob->u.DirEntry.enmType);
+                                    else
+                                        rtPathGlobRollbackResult(pGlob);
+                                }
+                            }
+                            if (rc != VINF_SUCCESS)
+                                break;
+                        }
+                        else
+                        {
+                            AssertMsgBreak(rc == VERR_MISMATCH, ("%Rrc\n", rc));
+                            rc = VINF_SUCCESS;
+                        }
+                    }
+                }
+                /*
+                 * Intermediate component: Directories only.
+                 */
+                else if (   pGlob->u.DirEntry.enmType == RTDIRENTRYTYPE_DIRECTORY
+                         || pGlob->u.DirEntry.enmType == RTDIRENTRYTYPE_UNKNOWN)
+                {
+                    rc = rtPathMatchExec(pGlob->u.DirEntry.szName, pGlob->u.DirEntry.cbName,
+                                         &pGlob->MatchInstrAlloc.paInstructions[pGlob->aComps[iComp].iMatchProg],
+                                         &pGlob->MatchCache);
+                    if (RT_SUCCESS(rc))
+                    {
+                        /* Recurse down into the alleged directory. */
+                        cch = offPath + pGlob->u.DirEntry.cbName;
+                        if (cch + 1 < sizeof(pGlob->szPath))
+                        {
+                            memcpy(&pGlob->szPath[offPath], pGlob->u.DirEntry.szName, pGlob->u.DirEntry.cbName);
+                            pGlob->szPath[cch++] = RTPATH_SLASH;
+                            pGlob->szPath[cch]   = '\0';
+
+                            if (rtPathGlobExecIsExpVar(pGlob, cch, iComp + 1))
+                                rc = rtPathGlobExecRecursiveVarExp(pGlob, cch, iComp + 1);
+                            else if (rtPathGlobExecIsPlainText(pGlob, cch, iComp + 1))
+                                rc = rtPathGlobExecRecursivePlainText(pGlob, cch, iComp + 1);
+                            else if (pGlob->aComps[pGlob->iFirstComp].fStarStar)
+                                rc = rtPathGlobExecRecursiveStarStar(pGlob, cch, iComp + 1, cch);
+                            else
+                                rc = rtPathGlobExecRecursiveGeneric(pGlob, cch, iComp + 1);
+                            if (rc != VINF_SUCCESS)
+                                return rc;
+                        }
+                        else
+                            pGlob->cPathOverflows++;
+                    }
+                    else
+                    {
+                        AssertMsgBreak(rc == VERR_MISMATCH, ("%Rrc\n", rc));
+                        rc = VINF_SUCCESS;
+                    }
+                }
+            }
+            /*
+             * RTDirRead failure.
+             */
+            else
+            {
+                /* The end?  */
+                if (rc == VERR_NO_MORE_FILES)
+                    rc = VINF_SUCCESS;
+                /* Try skip the entry if we end up with an overflow (szPath can't hold it either then). */
+                else if (rc == VERR_BUFFER_OVERFLOW)
+                {
+                    pGlob->cPathOverflows++;
+                    rc = rtPathGlobSkipDirEntry(hDir, cch);
+                    if (RT_SUCCESS(rc))
+                        continue;
+                }
+                /* else: Any other error is unexpected and should be reported. */
+                break;
+            }
+        }
+
+        RTDirClose(hDir);
+    }
+    /* Directory doesn't exist or something else is wrong, ignore this. */
+    else
+        rc = VINF_SUCCESS;
+    return rc;
+}
+
+
+/**
+ * Executes a glob search.
+ *
+ * @returns IPRT status code.
+ * @param   pGlob               The glob instance data.
+ */
+static int rtPathGlobExec(PRTPATHGLOB pGlob)
+{
+    Assert(pGlob->offFirstPath < sizeof(pGlob->szPath));
+    Assert(pGlob->szPath[pGlob->offFirstPath] == '\0');
+
+    int rc;
+    if (RT_LIKELY(pGlob->iFirstComp < pGlob->pParsed->cComps))
+    {
+        /*
+         * Call the appropriate function.
+         */
+        if (rtPathGlobExecIsExpVar(pGlob, pGlob->offFirstPath, pGlob->iFirstComp))
+            rc = rtPathGlobExecRecursiveVarExp(pGlob, pGlob->offFirstPath, pGlob->iFirstComp);
+        else if (rtPathGlobExecIsPlainText(pGlob, pGlob->offFirstPath, pGlob->iFirstComp))
+            rc = rtPathGlobExecRecursivePlainText(pGlob, pGlob->offFirstPath, pGlob->iFirstComp);
+        else if (pGlob->aComps[pGlob->iFirstComp].fStarStar)
+            rc = rtPathGlobExecRecursiveStarStar(pGlob, pGlob->offFirstPath, pGlob->iFirstComp, pGlob->offFirstPath);
+        else
+            rc = rtPathGlobExecRecursiveGeneric(pGlob, pGlob->offFirstPath, pGlob->iFirstComp);
+    }
+    else
+    {
+        /*
+         * Special case where we only have a root component or tilde expansion.
+         */
+        Assert(pGlob->offFirstPath > 0);
+        rc = RTPathQueryInfoEx(pGlob->szPath, &pGlob->u.ObjInfo, RTFSOBJATTRADD_NOTHING, RTPATH_F_FOLLOW_LINK);
+        if (   RT_SUCCESS(rc)
+            && rtPathGlobExecIsMatchFinalWithFileMode(pGlob, pGlob->u.ObjInfo.Attr.fMode))
+            rc = rtPathGlobAddResult(pGlob, pGlob->offFirstPath,
+                                     (pGlob->u.ObjInfo.Attr.fMode & RTFS_TYPE_MASK) >> RTFS_TYPE_DIRENTRYTYPE_SHIFT);
+        else
+            rc = VINF_SUCCESS;
+    }
+
+    /*
+     * Adjust the status code.  Check for results, hide RTPATHGLOB_F_FIRST_ONLY
+     * status code, and add warning if necessary.
+     */
+    if (pGlob->cResults > 0)
+    {
+        if (rc == VINF_CALLBACK_RETURN)
+            rc = VINF_SUCCESS;
+        if (rc == VINF_SUCCESS)
+        {
+            if (pGlob->cPathOverflows > 0)
+                rc = VINF_BUFFER_OVERFLOW;
+        }
+    }
+    else
+        rc = VERR_FILE_NOT_FOUND;
+
+    return rc;
+}
+
+
+RTDECL(int) RTPathGlob(const char *pszPattern, uint32_t fFlags, PPCRTPATHGLOBENTRY ppHead, uint32_t *pcResults)
+{
+    /*
+     * Input validation.
+     */
+    AssertPtrReturn(ppHead, VERR_INVALID_POINTER);
+    *ppHead = NULL;
+    if (pcResults)
+    {
+        AssertPtrReturn(pcResults, VERR_INVALID_POINTER);
+        *pcResults = 0;
+    }
+    AssertPtrReturn(pszPattern, VERR_INVALID_POINTER);
+    AssertReturn(!(fFlags & ~RTPATHGLOB_F_MASK), VERR_INVALID_FLAGS);
+    AssertReturn((fFlags & (RTPATHGLOB_F_NO_DIRS | RTPATHGLOB_F_ONLY_DIRS)) != (RTPATHGLOB_F_NO_DIRS | RTPATHGLOB_F_ONLY_DIRS),
+                 VERR_INVALID_FLAGS);
+
+    /*
+     * Parse the path.
+     */
+    size_t        cbParsed = RT_UOFFSETOF(RTPATHPARSED, aComps[1]); /** @todo 16 after testing */
+    PRTPATHPARSED pParsed = (PRTPATHPARSED)RTMemTmpAlloc(cbParsed);
+    AssertReturn(pParsed, VERR_NO_MEMORY);
+    int rc = RTPathParse(pszPattern, pParsed, cbParsed, RTPATH_STR_F_STYLE_HOST);
+    if (rc == VERR_BUFFER_OVERFLOW)
+    {
+        cbParsed = RT_UOFFSETOF_DYN(RTPATHPARSED, aComps[pParsed->cComps + 1]);
+        RTMemTmpFree(pParsed);
+        pParsed = (PRTPATHPARSED)RTMemTmpAlloc(cbParsed);
+        AssertReturn(pParsed, VERR_NO_MEMORY);
+
+        rc = RTPathParse(pszPattern, pParsed, cbParsed, RTPATH_STR_F_STYLE_HOST);
+    }
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * Check dir slash vs. only/not dir flag.
+         */
+        if (   !(fFlags & RTPATHGLOB_F_NO_DIRS)
+            || (   !(pParsed->fProps & RTPATH_PROP_DIR_SLASH)
+                && (   !(pParsed->fProps & (RTPATH_PROP_ROOT_SLASH | RTPATH_PROP_UNC))
+                    || pParsed->cComps > 1) ) )
+        {
+            if (pParsed->fProps & RTPATH_PROP_DIR_SLASH)
+                fFlags |= RTPATHGLOB_F_ONLY_DIRS;
+
+            /*
+             * Allocate and initialize the glob state data structure.
+             */
+            size_t      cbGlob = RT_UOFFSETOF_DYN(RTPATHGLOB, aComps[pParsed->cComps + 1]);
+            PRTPATHGLOB pGlob  = (PRTPATHGLOB)RTMemTmpAllocZ(cbGlob);
+            if (pGlob)
+            {
+                pGlob->pszPattern = pszPattern;
+                pGlob->fFlags     = fFlags;
+                pGlob->pParsed    = pParsed;
+                pGlob->ppNext     = &pGlob->pHead;
+                rc = rtPathGlobParse(pGlob, pszPattern, pParsed, fFlags);
+                if (RT_SUCCESS(rc))
+                {
+                    /*
+                     * Execute the search.
+                     */
+                    rc = rtPathGlobExec(pGlob);
+                    if (RT_SUCCESS(rc))
+                    {
+                        *ppHead = pGlob->pHead;
+                        if (pcResults)
+                            *pcResults = pGlob->cResults;
+                    }
+                    else
+                        RTPathGlobFree(pGlob->pHead);
+                }
+
+                RTMemTmpFree(pGlob->MatchInstrAlloc.paInstructions);
+                RTMemTmpFree(pGlob);
+            }
+            else
+                rc = VERR_NO_MEMORY;
+        }
+        else
+            rc = VERR_NOT_FOUND;
+    }
+    RTMemTmpFree(pParsed);
+    return rc;
+
+
+}
+
+
+RTDECL(void) RTPathGlobFree(PCRTPATHGLOBENTRY pHead)
+{
+    PRTPATHGLOBENTRY pCur = (PRTPATHGLOBENTRY)pHead;
+    while (pCur)
+    {
+        PRTPATHGLOBENTRY pNext = pCur->pNext;
+        pCur->pNext = NULL;
+        RTMemFree(pCur);
+        pCur = pNext;
+    }
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathHasExt.cpp b/src/VBox/Runtime/common/path/RTPathHasExt.cpp
new file mode 100644
index 00000000..f6bdba20
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathHasExt.cpp
@@ -0,0 +1,50 @@
+/* $Id: RTPathHasExt.cpp $ */
+/** @file
+ * IPRT - RTPathHasExt
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+
+
+RTDECL(bool) RTPathHasSuffix(const char *pszPath)
+{
+    return RTPathSuffix(pszPath) != NULL;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathHasPath.cpp b/src/VBox/Runtime/common/path/RTPathHasPath.cpp
new file mode 100644
index 00000000..d2c879e6
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathHasPath.cpp
@@ -0,0 +1,61 @@
+/* $Id: RTPathHasPath.cpp $ */
+/** @file
+ * IPRT - RTPathHasPath
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+#include <iprt/string.h>
+
+
+/**
+ * Checks if a path includes more than a filename.
+ *
+ * @returns true if path present.
+ * @returns false if no path.
+ * @param   pszPath     Path to check.
+ */
+RTDECL(bool) RTPathHasPath(const char *pszPath)
+{
+#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
+    return strpbrk(pszPath, "/\\:") != NULL;
+#else
+    return strpbrk(pszPath, "/") != NULL;
+#endif
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathJoin.cpp b/src/VBox/Runtime/common/path/RTPathJoin.cpp
new file mode 100644
index 00000000..c15be4d3
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathJoin.cpp
@@ -0,0 +1,67 @@
+/* $Id: RTPathJoin.cpp $ */
+/** @file
+ * IPRT - RTPathJoin.
+ */
+
+/*
+ * Copyright (C) 2010-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+
+
+
+
+RTDECL(int) RTPathJoin(char *pszPathDst, size_t cbPathDst, const char *pszPathSrc,
+                       const char *pszAppend)
+{
+    AssertPtr(pszPathDst);
+    AssertPtr(pszPathSrc);
+    AssertPtr(pszAppend);
+
+    /*
+     * The easy way: Copy the path into the buffer and call RTPathAppend.
+     */
+    size_t cchPathSrc = strlen(pszPathSrc);
+    if (cchPathSrc >= cbPathDst)
+        return VERR_BUFFER_OVERFLOW;
+    memcpy(pszPathDst, pszPathSrc, cchPathSrc + 1);
+
+    return RTPathAppend(pszPathDst, cbPathDst, pszAppend);
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathJoinA.cpp b/src/VBox/Runtime/common/path/RTPathJoinA.cpp
new file mode 100644
index 00000000..f41565b5
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathJoinA.cpp
@@ -0,0 +1,83 @@
+/* $Id: RTPathJoinA.cpp $ */
+/** @file
+ * IPRT - RTPathJoinA.
+ */
+
+/*
+ * Copyright (C) 2010-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+
+
+
+
+RTDECL(char *) RTPathJoinA(const char *pszPathSrc, const char *pszAppend)
+{
+    AssertPtr(pszAppend);
+    AssertPtr(pszPathSrc);
+
+    /*
+     * The easy way: Allocate a buffer and call RTPathAppend till it succeeds.
+     */
+    size_t cchPathSrc = strlen(pszPathSrc);
+    size_t cchAppend  = strlen(pszAppend);
+    size_t cbPathDst  = cchPathSrc + cchAppend + 4;
+    char *pszPathDst  = RTStrAlloc(cbPathDst);
+    if (pszPathDst)
+    {
+        memcpy(pszPathDst, pszPathSrc, cchPathSrc + 1);
+        int rc = RTPathAppend(pszPathDst, cbPathDst, pszAppend);
+        if (RT_FAILURE(rc))
+        {
+            /* This shouldn't happen, but if it does try again with a larger buffer... */
+            AssertRC(rc);
+
+            rc = RTStrRealloc(&pszPathDst, cbPathDst * 2);
+            if (RT_SUCCESS(rc))
+                rc = RTPathAppend(pszPathDst, cbPathDst, pszAppend);
+            if (RT_FAILURE(rc))
+            {
+                RTStrFree(pszPathDst);
+                pszPathDst = NULL;
+            }
+        }
+    }
+    return pszPathDst;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathJoinEx.cpp b/src/VBox/Runtime/common/path/RTPathJoinEx.cpp
new file mode 100644
index 00000000..ec1100b2
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathJoinEx.cpp
@@ -0,0 +1,70 @@
+/* $Id: RTPathJoinEx.cpp $ */
+/** @file
+ * IPRT - RTPathJoinEx.
+ */
+
+/*
+ * Copyright (C) 2010-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+
+
+
+
+RTDECL(int) RTPathJoinEx(char *pszPathDst, size_t cbPathDst,
+                         const char *pszPathSrc, size_t cchPathSrcMax,
+                         const char *pszAppend, size_t cchAppendMax, uint32_t fFlags)
+{
+    AssertPtr(pszPathDst);
+    AssertPtr(pszPathSrc);
+    AssertPtr(pszAppend);
+    Assert(RTPATH_STR_F_IS_VALID(fFlags, 0));
+
+    /*
+     * The easy way: Copy the path into the buffer and call RTPathAppend.
+     */
+    size_t cchPathSrc = RTStrNLen(pszPathSrc, cchPathSrcMax);
+    if (cchPathSrc >= cbPathDst)
+        return VERR_BUFFER_OVERFLOW;
+    memcpy(pszPathDst, pszPathSrc, cchPathSrc);
+    pszPathDst[cchPathSrc] = '\0';
+
+    return RTPathAppendEx(pszPathDst, cbPathDst, pszAppend, cchAppendMax, fFlags);
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathParentLength.cpp b/src/VBox/Runtime/common/path/RTPathParentLength.cpp
new file mode 100644
index 00000000..e0b6a2e4
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathParentLength.cpp
@@ -0,0 +1,107 @@
+/* $Id: RTPathParentLength.cpp $ */
+/** @file
+ * IPRT - RTPathParentLength
+ */
+
+/*
+ * Copyright (C) 2019-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include <iprt/ctype.h>
+#include <iprt/err.h>
+#include <iprt/string.h>
+
+#define RTPATH_TEMPLATE_CPP_H "RTPathParentLength.cpp.h"
+#include "rtpath-expand-template.cpp.h"
+
+
+
+RTDECL(size_t) RTPathParentLengthEx(const char *pszPath, uint32_t fFlags)
+{
+    /*
+     * Input validation.
+     */
+    AssertPtrReturn(pszPath, 0);
+    AssertReturn(*pszPath, 0);
+    AssertReturn(RTPATH_STR_F_IS_VALID(fFlags, 0), 0);
+    Assert(!(fFlags & RTPATH_STR_F_NO_END));
+
+    /*
+     * Invoke the worker for the selected path style.
+     */
+    switch (fFlags & RTPATH_STR_F_STYLE_MASK)
+    {
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+        case RTPATH_STR_F_STYLE_HOST:
+#endif
+        case RTPATH_STR_F_STYLE_DOS:
+            return rtPathParentLengthStyleDos(pszPath, fFlags);
+
+#if RTPATH_STYLE != RTPATH_STR_F_STYLE_DOS
+        case RTPATH_STR_F_STYLE_HOST:
+#endif
+        case RTPATH_STR_F_STYLE_UNIX:
+            return rtPathParentLengthStyleUnix(pszPath, fFlags);
+
+        default:
+            AssertFailedReturn(0); /* impossible */
+    }
+}
+
+
+
+
+/**
+ * Determins the length of the path specifying the parent directory, including
+ * trailing path separator (if present).
+ *
+ * @returns Parent directory part of the path, 0 if no parent.
+ * @param   pszPath         The path to examine.
+ *
+ * @note    Currently ignores UNC and may therefore return the server or
+ *          double-slash prefix as parent.
+ */
+RTDECL(size_t) RTPathParentLength(const char *pszPath)
+{
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+    return rtPathParentLengthStyleDos(pszPath, 0);
+#else
+    return rtPathParentLengthStyleUnix(pszPath, 0);
+#endif
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathParentLength.cpp.h b/src/VBox/Runtime/common/path/RTPathParentLength.cpp.h
new file mode 100644
index 00000000..77efe75b
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathParentLength.cpp.h
@@ -0,0 +1,68 @@
+/* $Id: RTPathParentLength.cpp.h $ */
+/** @file
+ * IPRT - RTPathParentLength - Code Template.
+ *
+ * This file included multiple times with different path style macros.
+ */
+
+/*
+ * Copyright (C) 2019-2022 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
+ */
+
+#include "rtpath-root-length-template.cpp.h"
+
+/**
+ * @copydoc RTPathParentLengthEx
+ */
+static size_t RTPATH_STYLE_FN(rtPathParentLength)(const char *pszPath, uint32_t fFlags)
+{
+    /*
+     * Determin the length of the root component so we can make sure
+     * we don't try ascend higher than it.
+     */
+    size_t const cchRoot = RTPATH_STYLE_FN(rtPathRootLengthEx)(pszPath, fFlags);
+
+    /*
+     * Rewind to the start of the final component.
+     */
+    size_t cch = strlen(pszPath);
+
+    /* Trailing slashes: */
+    while (cch > cchRoot && RTPATH_IS_SLASH(pszPath[cch - 1]))
+        cch--;
+
+    /* The component: */
+    while (cch > cchRoot && !RTPATH_IS_SEP(pszPath[cch - 1]))
+        cch--;
+
+    /* Done! */
+    return cch;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathParse.cpp b/src/VBox/Runtime/common/path/RTPathParse.cpp
new file mode 100644
index 00000000..a9ad740e
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathParse.cpp
@@ -0,0 +1,85 @@
+/* $Id: RTPathParse.cpp $ */
+/** @file
+ * IPRT - RTPathParse
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include <iprt/ctype.h>
+#include <iprt/err.h>
+#include <iprt/string.h>
+
+#define RTPATH_TEMPLATE_CPP_H "RTPathParse.cpp.h"
+#include "rtpath-expand-template.cpp.h"
+
+
+RTDECL(int) RTPathParse(const char *pszPath, PRTPATHPARSED pParsed, size_t cbParsed, uint32_t fFlags)
+{
+    /*
+     * Input validation.
+     */
+    AssertReturn(cbParsed >= RT_UOFFSETOF(RTPATHPARSED, aComps), VERR_INVALID_PARAMETER);
+    AssertPtrReturn(pParsed, 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);
+
+    /*
+     * Invoke the worker for the selected path style.
+     */
+    switch (fFlags & RTPATH_STR_F_STYLE_MASK)
+    {
+#if defined(RT_OS_OS2) || defined(RT_OS_WINDOWS)
+        case RTPATH_STR_F_STYLE_HOST:
+#endif
+        case RTPATH_STR_F_STYLE_DOS:
+            return rtPathParseStyleDos(pszPath, pParsed, cbParsed, fFlags);
+
+#if !defined(RT_OS_OS2) && !defined(RT_OS_WINDOWS)
+        case RTPATH_STR_F_STYLE_HOST:
+#endif
+        case RTPATH_STR_F_STYLE_UNIX:
+            return rtPathParseStyleUnix(pszPath, pParsed, cbParsed, fFlags);
+
+        default:
+            AssertFailedReturn(VERR_INVALID_FLAGS); /* impossible */
+    }
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathParse.cpp.h b/src/VBox/Runtime/common/path/RTPathParse.cpp.h
new file mode 100644
index 00000000..1a876cc7
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathParse.cpp.h
@@ -0,0 +1,256 @@
+/* $Id: RTPathParse.cpp.h $ */
+/** @file
+ * IPRT - RTPathParse - Code Template.
+ *
+ * This file included multiple times with different path style macros.
+ */
+
+/*
+ * Copyright (C) 2006-2022 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
+ */
+
+
+
+/**
+ * @copydoc RTPathParse
+ */
+static int RTPATH_STYLE_FN(rtPathParse)(const char *pszPath, PRTPATHPARSED pParsed, size_t cbParsed, uint32_t fFlags)
+{
+    /*
+     * Parse the root specification if present and initialize the parser state
+     * (keep it on the stack for speed).
+     */
+    uint32_t const  cMaxComps =  cbParsed < RT_UOFFSETOF(RTPATHPARSED, aComps[0xfff0])
+                              ? (uint32_t)((cbParsed - RT_UOFFSETOF(RTPATHPARSED, aComps)) / sizeof(pParsed->aComps[0]))
+                              : 0xfff0;
+    uint32_t        idxComp   = 0;
+    uint32_t        cchPath;
+    uint32_t        offCur;
+    uint16_t        fProps;
+
+    if (RTPATH_IS_SLASH(pszPath[0]))
+    {
+        if (fFlags & RTPATH_STR_F_NO_START)
+        {
+            offCur = 1;
+            while (RTPATH_IS_SLASH(pszPath[offCur]))
+                offCur++;
+            if (!pszPath[offCur])
+                return VERR_PATH_ZERO_LENGTH;
+            fProps = RTPATH_PROP_RELATIVE | RTPATH_PROP_EXTRA_SLASHES;
+            cchPath = 0;
+        }
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+        else if (RTPATH_IS_SLASH(pszPath[1]))
+        {
+            /* UNC - there are exactly two prefix slashes followed by a namespace
+               or computer name, which can be empty on windows.  */
+            offCur = 2;
+            while (!RTPATH_IS_SLASH(pszPath[offCur]) && pszPath[offCur])
+                offCur++;
+
+            /* Special fun for windows. */
+            fProps = RTPATH_PROP_UNC | RTPATH_PROP_ABSOLUTE;
+            if (   offCur == 3
+                && (pszPath[2] == '.' || pszPath[2] == '?'))
+                fProps |= RTPATH_PROP_SPECIAL_UNC;
+
+            if (RTPATH_IS_SLASH(pszPath[offCur]))
+            {
+                fProps |= RTPATH_PROP_ROOT_SLASH;
+                offCur++;
+            }
+            cchPath = offCur;
+        }
+#endif
+        else
+        {
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+            fProps = RTPATH_PROP_ROOT_SLASH | RTPATH_PROP_RELATIVE;
+#else
+            fProps = RTPATH_PROP_ROOT_SLASH | RTPATH_PROP_ABSOLUTE;
+#endif
+            offCur = 1;
+            cchPath = 1;
+        }
+    }
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+    else if (RT_C_IS_ALPHA(pszPath[0]) && pszPath[1] == ':')
+    {
+        if (!RTPATH_IS_SLASH(pszPath[2]))
+        {
+            fProps = RTPATH_PROP_VOLUME | RTPATH_PROP_RELATIVE;
+            offCur = 2;
+        }
+        else
+        {
+            fProps = RTPATH_PROP_VOLUME | RTPATH_PROP_ROOT_SLASH | RTPATH_PROP_ABSOLUTE;
+            offCur = 3;
+        }
+        cchPath = offCur;
+    }
+#endif
+    else
+    {
+        fProps  = RTPATH_PROP_RELATIVE;
+        offCur  = 0;
+        cchPath = 0;
+    }
+
+    /* Add it to the component array . */
+    if (offCur && !(fFlags & RTPATH_STR_F_NO_START))
+    {
+        cchPath = offCur;
+        if (idxComp < cMaxComps)
+        {
+            pParsed->aComps[idxComp].off = 0;
+            pParsed->aComps[idxComp].cch = offCur;
+        }
+        idxComp++;
+
+        /* Skip unnecessary slashes following the root-spec. */
+        if (RTPATH_IS_SLASH(pszPath[offCur]))
+        {
+            fProps |= RTPATH_PROP_EXTRA_SLASHES;
+            do
+                offCur++;
+            while (RTPATH_IS_SLASH(pszPath[offCur]));
+        }
+    }
+
+    /*
+     * Parse the rest.
+     */
+    if (pszPath[offCur])
+    {
+        for (;;)
+        {
+            Assert(!RTPATH_IS_SLASH(pszPath[offCur]));
+
+            /* Find the end of the component. */
+            uint32_t    offStart = offCur;
+            char        ch;
+            while ((ch = pszPath[offCur]) != '\0' && !RTPATH_IS_SLASH(ch))
+                offCur++;
+            if (offCur >= _64K)
+                return VERR_FILENAME_TOO_LONG;
+
+            /* Add it. */
+            uint32_t cchComp = offCur - offStart;
+            if (idxComp < cMaxComps)
+            {
+                pParsed->aComps[idxComp].off = offStart;
+                pParsed->aComps[idxComp].cch = cchComp;
+            }
+            idxComp++;
+            cchPath += cchComp;
+
+            /* Look for '.' and '..' references. */
+            if (cchComp == 1 && pszPath[offCur - 1] == '.')
+                fProps |= RTPATH_PROP_DOT_REFS;
+            else if (cchComp == 2 && pszPath[offCur - 1] == '.' && pszPath[offCur - 2] == '.')
+            {
+                fProps &= ~RTPATH_PROP_ABSOLUTE;
+                fProps |= RTPATH_PROP_DOTDOT_REFS | RTPATH_PROP_RELATIVE;
+            }
+
+            /* Skip unnecessary slashes. Leave ch unchanged! */
+            char ch2 = ch;
+            if (ch2)
+            {
+                ch2 = pszPath[++offCur];
+                if (RTPATH_IS_SLASH(ch2))
+                {
+                    fProps |= RTPATH_PROP_EXTRA_SLASHES;
+                    do
+                        ch2 = pszPath[++offCur];
+                    while (RTPATH_IS_SLASH(ch2));
+                }
+            }
+
+            /* The end? */
+            if (ch2 == '\0')
+            {
+                pParsed->offSuffix = offCur;
+                pParsed->cchSuffix = 0;
+                if (ch)
+                {
+                    if (!(fFlags & RTPATH_STR_F_NO_END))
+                    {
+                        fProps |= RTPATH_PROP_DIR_SLASH; /* (not counted in component, but in cchPath) */
+                        cchPath++;
+                    }
+                    else
+                        fProps |= RTPATH_PROP_EXTRA_SLASHES;
+                }
+                else if (!(fFlags & RTPATH_STR_F_NO_END))
+                {
+                    fProps |= RTPATH_PROP_FILENAME;
+
+                    /* Look for a suffix: */
+                    uint32_t offSuffix = offStart + cchComp;
+                    while (--offSuffix > offStart)
+                        if (pszPath[offSuffix] == '.')
+                        {
+                            uint32_t cchSuffix = offStart + cchComp - offSuffix;
+                            if (cchSuffix > 1)
+                            {
+                                pParsed->cchSuffix = cchSuffix;
+                                pParsed->offSuffix = offSuffix;
+                                fProps |= RTPATH_PROP_SUFFIX;
+                            }
+                            break;
+                        }
+                }
+                break;
+            }
+
+            /* No, not the end. Account for an separator before we restart the loop. */
+            cchPath += sizeof(RTPATH_SLASH_STR) - 1;
+        }
+    }
+    else
+    {
+        pParsed->offSuffix = offCur;
+        pParsed->cchSuffix = 0;
+    }
+    if (offCur >= _64K)
+        return VERR_FILENAME_TOO_LONG;
+
+    /*
+     * Store the remainder of the state and we're done.
+     */
+    pParsed->fProps  = fProps;
+    pParsed->cchPath = cchPath;
+    pParsed->cComps  = idxComp;
+
+    return idxComp <= cMaxComps ? VINF_SUCCESS : VERR_BUFFER_OVERFLOW;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathParseSimple.cpp b/src/VBox/Runtime/common/path/RTPathParseSimple.cpp
new file mode 100644
index 00000000..a0737036
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathParseSimple.cpp
@@ -0,0 +1,162 @@
+/* $Id: RTPathParseSimple.cpp $ */
+/** @file
+ * IPRT - RTPathParseSimple
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include <iprt/ctype.h>
+
+
+/**
+ * Parses a path.
+ *
+ * It figures the length of the directory component, the offset of
+ * the file name and the location of the suffix dot.
+ *
+ * @returns The path length.
+ *
+ * @param   pszPath     Path to find filename in.
+ * @param   pcchDir     Where to put the length of the directory component. If
+ *                      no directory, this will be 0. Optional.
+ * @param   poffName    Where to store the filename offset.
+ *                      If empty string or if it's ending with a slash this
+ *                      will be set to -1. Optional.
+ * @param   poffSuff    Where to store the suffix offset (the last dot).
+ *                      If empty string or if it's ending with a slash this
+ *                      will be set to -1. Optional.
+ */
+RTDECL(size_t) RTPathParseSimple(const char *pszPath, size_t *pcchDir, ssize_t *poffName, ssize_t *poffSuff)
+{
+    /*
+     * First deal with the root as it is always more fun that you'd think.
+     */
+    const char *psz     = pszPath;
+    size_t      cchRoot = 0;
+
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+    if (RT_C_IS_ALPHA(*psz) && RTPATH_IS_VOLSEP(psz[1]))
+    {
+        /* Volume specifier. */
+        cchRoot = 2;
+        psz    += 2;
+    }
+    else if (RTPATH_IS_SLASH(*psz) && RTPATH_IS_SLASH(psz[1]))
+    {
+        /* UNC - there are exactly two prefix slashes followed by a namespace
+           or computer name, which can be empty on windows.  */
+        cchRoot = 2;
+        psz += 2;
+        while (!RTPATH_IS_SLASH(*psz) && *psz)
+        {
+            cchRoot++;
+            psz++;
+        }
+    }
+#endif
+    while (RTPATH_IS_SLASH(*psz))
+    {
+        cchRoot++;
+        psz++;
+    }
+
+    /*
+     * Do the remainder.
+     */
+    const char *pszName = psz;
+    const char *pszLastDot = NULL;
+    for (;; psz++)
+    {
+        switch (*psz)
+        {
+            default:
+                break;
+
+            /* handle separators. */
+#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
+            case '\\':
+#endif
+            case '/':
+                pszName = psz + 1;
+                pszLastDot = NULL;
+                break;
+
+            case '.':
+                pszLastDot = psz;
+                break;
+
+            /*
+             * The end. Complete the results.
+             */
+            case '\0':
+            {
+                ssize_t offName = *pszName != '\0' ? pszName - pszPath : -1;
+                if (poffName)
+                    *poffName = offName;
+
+                if (poffSuff)
+                {
+                    ssize_t offSuff = -1;
+                    if (   pszLastDot
+                        && pszLastDot != pszName
+                        && pszLastDot[1] != '\0')
+                    {
+                        offSuff = pszLastDot - pszPath;
+                        Assert(offSuff > offName);
+                    }
+                    *poffSuff = offSuff;
+                }
+
+                if (pcchDir)
+                {
+                    size_t cch = offName < 0 ? psz - pszPath : offName - 1 < (ssize_t)cchRoot ? cchRoot : offName - 1;
+                    while (cch > cchRoot && RTPATH_IS_SLASH(pszPath[cch - 1]))
+                        cch--;
+                    *pcchDir = cch;
+                }
+
+                return psz - pszPath;
+            }
+        }
+    }
+
+    /* will never get here */
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathParsedReassemble.cpp b/src/VBox/Runtime/common/path/RTPathParsedReassemble.cpp
new file mode 100644
index 00000000..5043f10b
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathParsedReassemble.cpp
@@ -0,0 +1,161 @@
+/* $Id: RTPathParsedReassemble.cpp $ */
+/** @file
+ * IPRT - RTPathParsedReassemble.
+ */
+
+/*
+ * Copyright (C) 2013-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+
+
+RTDECL(int) RTPathParsedReassemble(const char *pszSrcPath, PRTPATHPARSED pParsed, uint32_t fFlags,
+                                   char *pszDstPath, size_t cbDstPath)
+{
+    /*
+     * Input validation.
+     */
+    AssertPtrReturn(pszSrcPath, VERR_INVALID_POINTER);
+    AssertPtrReturn(pParsed, VERR_INVALID_POINTER);
+    AssertReturn(pParsed->cComps > 0, VERR_INVALID_PARAMETER);
+    AssertReturn(RTPATH_STR_F_IS_VALID(fFlags, 0) && !(fFlags & RTPATH_STR_F_MIDDLE), VERR_INVALID_FLAGS);
+    AssertPtrReturn(pszDstPath, VERR_INVALID_POINTER);
+
+    /*
+     * Recalculate the length.
+     */
+    uint32_t const  cComps  = pParsed->cComps;
+    uint32_t        idxComp = 0;
+    uint32_t        cchPath = 0;
+    if (RTPATH_PROP_HAS_ROOT_SPEC(pParsed->fProps))
+    {
+        cchPath = pParsed->aComps[0].cch;
+        idxComp++;
+    }
+    bool fNeedSlash = false;
+    while (idxComp < cComps)
+    {
+        uint32_t const cchComp = pParsed->aComps[idxComp].cch;
+        idxComp++;
+        if (cchComp > 0)
+        {
+            cchPath += cchComp + fNeedSlash;
+            fNeedSlash = true;
+        }
+    }
+    if ((pParsed->fProps & RTPATH_PROP_DIR_SLASH) && fNeedSlash)
+        cchPath += 1;
+    pParsed->cchPath = cchPath;
+    if (cbDstPath > cchPath)
+    { /* likely */ }
+    else
+    {
+        if (cbDstPath)
+            *pszDstPath = '\0';
+        return VERR_BUFFER_OVERFLOW;
+    }
+
+    /*
+     * Figure which slash to use.
+     */
+    char chSlash;
+    switch (fFlags & RTPATH_STR_F_STYLE_MASK)
+    {
+        case RTPATH_STR_F_STYLE_HOST:
+            chSlash = RTPATH_SLASH;
+            break;
+
+        case RTPATH_STR_F_STYLE_DOS:
+            chSlash = '\\';
+            break;
+
+        case RTPATH_STR_F_STYLE_UNIX:
+            chSlash = '/';
+            break;
+
+        default:
+            AssertFailedReturn(VERR_INVALID_FLAGS); /* impossible */
+    }
+
+    /*
+     * Do the joining.
+     * Note! Using memmove here as we want to support pszSrcPath == pszDstPath.
+     */
+    char *pszDst = pszDstPath;
+    idxComp      = 0;
+    fNeedSlash   = false;
+
+    if (RTPATH_PROP_HAS_ROOT_SPEC(pParsed->fProps))
+    {
+        uint32_t cchComp = pParsed->aComps[0].cch;
+        memmove(pszDst, &pszSrcPath[pParsed->aComps[0].off], cchComp);
+
+        /* fix the slashes (harmless for unix style) */
+        char chOtherSlash = chSlash == '\\' ? '/' : '\\';
+        while (cchComp-- > 0)
+        {
+            if (*pszDst == chOtherSlash)
+                *pszDst = chSlash;
+            pszDst++;
+        }
+        idxComp = 1;
+    }
+
+    while (idxComp < cComps)
+    {
+        uint32_t const cchComp = pParsed->aComps[idxComp].cch;
+        if (cchComp > 0)
+        {
+            if (fNeedSlash)
+                *pszDst++ = chSlash;
+            fNeedSlash = true;
+            memmove(pszDst, &pszSrcPath[pParsed->aComps[idxComp].off], cchComp);
+            pszDst += cchComp;
+        }
+        idxComp++;
+    }
+
+    if ((pParsed->fProps & RTPATH_PROP_DIR_SLASH) && fNeedSlash)
+        *pszDst++ = chSlash;
+    *pszDst = '\0';
+
+    return VINF_SUCCESS;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathPurgeFilename.cpp b/src/VBox/Runtime/common/path/RTPathPurgeFilename.cpp
new file mode 100644
index 00000000..e83a639d
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathPurgeFilename.cpp
@@ -0,0 +1,131 @@
+/* $Id: RTPathPurgeFilename.cpp $ */
+/** @file
+ * IPRT - RTPathPurgeFilename
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include <iprt/string.h>
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** Character mappings for translating a string into a valid Windows or OS/2 filename. */
+static const unsigned char g_auchWinOs2Map[256] =
+{
+      0, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95,
+     32, 33, 95, 35, 36, 37, 38, 39, 40, 41, 95, 43, 44, 45, 46, 95, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 95, 59, 95, 61, 95, 95,
+     64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 95, 93, 94, 95,
+     96, 97, 98, 99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123, 95,125,126, 95,
+    128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,
+    160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,
+    192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,
+    224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255
+};
+
+/* Program for generating the table:
+#include <stdio.h>
+#include <string.h>
+int main()
+{
+    int i;
+    printf("static const unsigned char g_auchWinOs2Map[256] =\n"
+           "{");
+    for (i = 0; i < 256; i++)
+    {
+        int ch = i;
+        if (   i <= 31
+            || i == 127
+            || (i < 127 && strchr("/\\*:<>?|\"",  (char)i) != NULL))
+            ch = i > 0 ? '_' : 0;
+        if (i == 0)
+            printf("\n    %3d", ch);
+        else if ((i % 32) == 0)
+            printf(",\n    %3d", ch);
+        else
+            printf(",%3d", ch);
+    }
+    printf("\n"
+           "};\n");
+    return 0;
+}
+*/
+
+
+RTDECL(char *) RTPathPurgeFilename(char *pszString, uint32_t fFlags)
+{
+    AssertPtrReturn(pszString, NULL);
+    Assert(RTPATH_STR_F_IS_VALID(fFlags, 0));
+
+    /*
+     * Take action according to the style after first resolving the host style.
+     */
+    if ((fFlags & RTPATH_STR_F_STYLE_MASK) == RTPATH_STR_F_STYLE_HOST)
+        fFlags = (fFlags & ~RTPATH_STR_F_STYLE_MASK) | RTPATH_STYLE;
+    if ((fFlags & RTPATH_STR_F_STYLE_MASK) == RTPATH_STR_F_STYLE_DOS)
+    {
+        /*
+         * Produce a filename valid on Windows and OS/2.
+         * Here all control characters (including tab) and path separators needs to
+         * be replaced, in addition to a scattering of other ones.
+         */
+        unsigned char *puch = (unsigned char *)pszString;
+        uintptr_t      uch;
+        while ((uch = *puch))
+            *puch++ = g_auchWinOs2Map[uch];
+    }
+    else
+    {
+        /*
+         * Produce a filename valid on a (typical) Unix system.
+         * Here only the '/' needs to be replaced.
+         */
+        Assert((fFlags & RTPATH_STR_F_STYLE_MASK) == RTPATH_STR_F_STYLE_UNIX);
+        char *pszSlash = strchr(pszString, '/');
+        while (pszSlash != NULL)
+        {
+            *pszSlash = '_';
+            pszSlash = strchr(pszSlash + 1, '/');
+        }
+    }
+    return pszString;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathRealDup.cpp b/src/VBox/Runtime/common/path/RTPathRealDup.cpp
new file mode 100644
index 00000000..57797e1b
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathRealDup.cpp
@@ -0,0 +1,64 @@
+/* $Id: RTPathRealDup.cpp $ */
+/** @file
+ * IPRT - RTPathRealDup
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+#include <iprt/errcore.h>
+#include <iprt/param.h>
+#include <iprt/string.h>
+
+
+
+/**
+ * Same as RTPathReal only the result is RTStrDup()'ed.
+ *
+ * @returns Pointer to real path. Use RTStrFree() to free this string.
+ * @returns NULL if RTPathReal() or RTStrDup() fails.
+ * @param   pszPath
+ */
+RTDECL(char *) RTPathRealDup(const char *pszPath)
+{
+    char szPath[RTPATH_MAX];
+    int rc = RTPathReal(pszPath, szPath, sizeof(szPath));
+    if (RT_SUCCESS(rc))
+        return RTStrDup(szPath);
+    return NULL;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathRmCmd.cpp b/src/VBox/Runtime/common/path/RTPathRmCmd.cpp
new file mode 100644
index 00000000..33623f0e
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathRmCmd.cpp
@@ -0,0 +1,658 @@
+/* $Id: RTPathRmCmd.cpp $ */
+/** @file
+ * IPRT - RM Command.
+ */
+
+/*
+ * Copyright (C) 2013-2022 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/path.h>
+
+#include <iprt/buildconfig.h>
+#include <iprt/ctype.h>
+#include <iprt/err.h>
+#include <iprt/file.h>
+#include <iprt/dir.h>
+#include <iprt/getopt.h>
+#include <iprt/initterm.h>
+#include <iprt/message.h>
+#include <iprt/stream.h>
+#include <iprt/string.h>
+#include <iprt/symlink.h>
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+#define RTPATHRMCMD_OPT_INTERACTIVE         1000
+#define RTPATHRMCMD_OPT_ONE_FILE_SYSTEM     1001
+#define RTPATHRMCMD_OPT_PRESERVE_ROOT       1002
+#define RTPATHRMCMD_OPT_NO_PRESERVE_ROOT    1003
+#define RTPATHRMCMD_OPT_MACHINE_READABLE    1004
+
+/** The max directory entry size. */
+#define RTPATHRM_DIR_MAX_ENTRY_SIZE         (sizeof(RTDIRENTRYEX) + 4096)
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/** Interactive option. */
+typedef enum
+{
+    RTPATHRMCMDINTERACTIVE_NONE = 1,
+    RTPATHRMCMDINTERACTIVE_ALL,
+    RTPATHRMCMDINTERACTIVE_ONCE
+    /** @todo possible that we should by default prompt if removing read-only
+     *        files or files owned by someone else. We currently don't. */
+} RTPATHRMCMDINTERACTIVE;
+
+/**
+ * IPRT rm option structure.
+ */
+typedef struct RTPATHRMCMDOPTS
+{
+    /** Whether to delete recursively. */
+    bool                    fRecursive;
+    /** Whether to delete directories as well as other kinds of files. */
+    bool                    fDirsAndOther;
+    /** Whether to remove files without prompting and ignoring non-existing
+     * files.  */
+    bool                    fForce;
+    /** Machine readable output. */
+    bool                    fMachineReadable;
+    /** Don't try remove root ('/') if set, otherwise don't treat root specially. */
+    bool                    fPreserveRoot;
+    /** Whether to keep to one file system. */
+    bool                    fOneFileSystem;
+    /** Whether to safely delete files (overwrite 3x before unlinking). */
+    bool                    fSafeDelete;
+    /** Whether to be verbose about the operation. */
+    bool                    fVerbose;
+    /** The interactive setting. */
+    RTPATHRMCMDINTERACTIVE  enmInteractive;
+} RTPATHRMCMDOPTS;
+/** Pointer to the IPRT rm options. */
+typedef RTPATHRMCMDOPTS *PRTPATHRMCMDOPTS;
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** A bunch of zeros. */
+static uint8_t const    g_abZeros[16384] = { 0 };
+/** A bunch of 0xFF bytes. (lazy init) */
+static uint8_t          g_ab0xFF[16384];
+
+
+static void rtPathRmVerbose(PRTPATHRMCMDOPTS pOpts, const char *pszPath)
+{
+    if (!pOpts->fMachineReadable)
+        RTPrintf("%s\n", pszPath);
+}
+
+
+static int rtPathRmError(PRTPATHRMCMDOPTS pOpts, const char *pszPath, int rc,
+                         const char *pszFormat, ...)
+{
+    if (pOpts->fMachineReadable)
+        RTPrintf("fname=%s%crc=%d%c", pszPath, 0, rc, 0);
+    else
+    {
+        va_list va;
+        va_start(va, pszFormat);
+        RTMsgErrorV(pszFormat, va);
+        va_end(va);
+    }
+    return rc;
+}
+
+
+/**
+ * Worker that removes a symbolic link.
+ *
+ * @returns IPRT status code, errors go via rtPathRmError.
+ * @param   pOpts               The RM options.
+ * @param   pszPath             The path to the symbolic link.
+ */
+static int rtPathRmOneSymlink(PRTPATHRMCMDOPTS pOpts, const char *pszPath)
+{
+    if (pOpts->fVerbose)
+        rtPathRmVerbose(pOpts, pszPath);
+    int rc = RTSymlinkDelete(pszPath, 0);
+    if (RT_FAILURE(rc))
+        return rtPathRmError(pOpts, pszPath, rc, "Error removing symbolic link '%s': %Rrc\n", pszPath, rc);
+    return rc;
+}
+
+
+/**
+ * Worker that removes a file.
+ *
+ * Currently used to delete both regular and special files.
+ *
+ * @returns IPRT status code, errors go via rtPathRmError.
+ * @param   pOpts               The RM options.
+ * @param   pszPath             The path to the file.
+ * @param   pObjInfo            The FS object info for the file.
+ */
+static int rtPathRmOneFile(PRTPATHRMCMDOPTS pOpts, const char *pszPath, PRTFSOBJINFO pObjInfo)
+{
+    int rc;
+    if (pOpts->fVerbose)
+        rtPathRmVerbose(pOpts, pszPath);
+
+    /*
+     * Wipe the file if requested and possible.
+     */
+    if (pOpts->fSafeDelete && RTFS_IS_FILE(pObjInfo->Attr.fMode))
+    {
+        /* Lazy init of the 0xff buffer. */
+        if (g_ab0xFF[0] != 0xff || g_ab0xFF[sizeof(g_ab0xFF) - 1] != 0xff)
+            memset(g_ab0xFF, 0xff, sizeof(g_ab0xFF));
+
+        RTFILE hFile;
+        rc = RTFileOpen(&hFile, pszPath, RTFILE_O_WRITE);
+        if (RT_FAILURE(rc))
+            return rtPathRmError(pOpts, pszPath, rc, "Opening '%s' for overwriting: %Rrc\n", pszPath, rc);
+
+        for (unsigned iPass = 0; iPass < 3; iPass++)
+        {
+            uint8_t const *pabFiller = iPass == 1 ? g_abZeros         : g_ab0xFF;
+            size_t const   cbFiller  = iPass == 1 ? sizeof(g_abZeros) : sizeof(g_ab0xFF);
+
+            rc = RTFileSeek(hFile, 0, RTFILE_SEEK_BEGIN, NULL);
+            if (RT_FAILURE(rc))
+            {
+                rc = rtPathRmError(pOpts, pszPath, rc, "Error seeking to start of '%s': %Rrc\n", pszPath, rc);
+                break;
+            }
+            for (RTFOFF cbLeft = pObjInfo->cbObject; cbLeft > 0; cbLeft -= cbFiller)
+            {
+                size_t cbToWrite = cbFiller;
+                if (cbLeft < (RTFOFF)cbToWrite)
+                    cbToWrite = (size_t)cbLeft;
+                rc = RTFileWrite(hFile, pabFiller, cbToWrite, NULL);
+                if (RT_FAILURE(rc))
+                {
+                    rc = rtPathRmError(pOpts, pszPath, rc, "Error writing to '%s': %Rrc\n", pszPath, rc);
+                    break;
+                }
+            }
+        }
+
+        int rc2 = RTFileClose(hFile);
+        if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
+            return rtPathRmError(pOpts, pszPath, rc2, "Closing '%s' failed: %Rrc\n", pszPath, rc);
+        if (RT_FAILURE(rc))
+            return rc;
+    }
+
+    /*
+     * Remove the file.
+     */
+    rc = RTFileDelete(pszPath);
+    if (RT_FAILURE(rc))
+        return rtPathRmError(pOpts, pszPath, rc,
+                             RTFS_IS_FILE(pObjInfo->Attr.fMode)
+                             ? "Error removing regular file '%s': %Rrc\n"
+                             : "Error removing special file '%s': %Rrc\n",
+                             pszPath, rc);
+    return rc;
+}
+
+
+/**
+ * Deletes one directory (if it's empty).
+ *
+ * @returns IPRT status code, errors go via rtPathRmError.
+ * @param   pOpts               The RM options.
+ * @param   pszPath             The path to the directory.
+ */
+static int rtPathRmOneDir(PRTPATHRMCMDOPTS pOpts, const char *pszPath)
+{
+    if (pOpts->fVerbose)
+        rtPathRmVerbose(pOpts, pszPath);
+
+    int rc = RTDirRemove(pszPath);
+    if (RT_FAILURE(rc))
+        return rtPathRmError(pOpts, pszPath, rc, "Error removing directory '%s': %Rrc", pszPath, rc);
+    return rc;
+}
+
+
+/**
+ * Recursively delete a directory.
+ *
+ * @returns IPRT status code, errors go via rtPathRmError.
+ * @param   pOpts               The RM options.
+ * @param   pszPath             Pointer to a writable buffer holding the path to
+ *                              the directory.
+ * @param   cchPath             The length of the path (avoid strlen).
+ * @param   pDirEntry           Pointer to a directory entry buffer that is
+ *                              RTPATHRM_DIR_MAX_ENTRY_SIZE bytes big.
+ */
+static int rtPathRmRecursive(PRTPATHRMCMDOPTS pOpts, char *pszPath, size_t cchPath, PRTDIRENTRYEX pDirEntry)
+{
+    /*
+     * Make sure the path ends with a slash.
+     */
+    if (!cchPath || !RTPATH_IS_SLASH(pszPath[cchPath - 1]))
+    {
+        if (cchPath + 1 >= RTPATH_MAX)
+            return rtPathRmError(pOpts, pszPath, VERR_BUFFER_OVERFLOW, "Buffer overflow fixing up '%s'.\n", pszPath);
+        pszPath[cchPath++] = RTPATH_SLASH;
+        pszPath[cchPath]   = '\0';
+    }
+
+    /*
+     * Traverse the directory.
+     */
+    RTDIR hDir;
+    int rc = RTDirOpen(&hDir, pszPath);
+    if (RT_FAILURE(rc))
+        return rtPathRmError(pOpts, pszPath, rc, "Error opening directory '%s': %Rrc", pszPath, rc);
+    int rcRet = VINF_SUCCESS;
+    for (;;)
+    {
+        /*
+         * Read the next entry, constructing an full path for it.
+         */
+        size_t cbEntry = RTPATHRM_DIR_MAX_ENTRY_SIZE;
+        rc = RTDirReadEx(hDir, pDirEntry, &cbEntry, RTFSOBJATTRADD_NOTHING, RTPATH_F_ON_LINK);
+        if (rc == VERR_NO_MORE_FILES)
+        {
+            /*
+             * Reached the end of the directory.
+             */
+            pszPath[cchPath] = '\0';
+            rc = RTDirClose(hDir);
+            if (RT_FAILURE(rc))
+                return rtPathRmError(pOpts, pszPath, rc, "Error closing directory '%s': %Rrc", pszPath, rc);
+
+            /* Delete the directory. */
+            int rc2 = rtPathRmOneDir(pOpts, pszPath);
+            if (RT_FAILURE(rc2) && RT_SUCCESS(rcRet))
+                return rc2;
+            return rcRet;
+        }
+
+        if (RT_FAILURE(rc))
+        {
+            rc = rtPathRmError(pOpts, pszPath, rc, "Error reading directory '%s': %Rrc", pszPath, rc);
+            break;
+        }
+
+        /* Skip '.' and '..'. */
+        if (   pDirEntry->szName[0] == '.'
+            && (   pDirEntry->cbName == 1
+                || (   pDirEntry->cbName == 2
+                    && pDirEntry->szName[1] == '.')))
+            continue;
+
+        /* Construct full path. */
+        if (cchPath + pDirEntry->cbName >= RTPATH_MAX)
+        {
+            pszPath[cchPath] = '\0';
+            rc = rtPathRmError(pOpts, pszPath, VERR_BUFFER_OVERFLOW, "Path buffer overflow in directory '%s'.", pszPath);
+            break;
+        }
+        memcpy(pszPath + cchPath, pDirEntry->szName, pDirEntry->cbName + 1);
+
+        /*
+         * Take action according to the type.
+         */
+        switch (pDirEntry->Info.Attr.fMode & RTFS_TYPE_MASK)
+        {
+            case RTFS_TYPE_FILE:
+                rc = rtPathRmOneFile(pOpts, pszPath, &pDirEntry->Info);
+                break;
+
+            case RTFS_TYPE_DIRECTORY:
+                rc = rtPathRmRecursive(pOpts, pszPath, cchPath + pDirEntry->cbName, pDirEntry);
+                break;
+
+            case RTFS_TYPE_SYMLINK:
+                rc = rtPathRmOneSymlink(pOpts, pszPath);
+                break;
+
+            case RTFS_TYPE_FIFO:
+            case RTFS_TYPE_DEV_CHAR:
+            case RTFS_TYPE_DEV_BLOCK:
+            case RTFS_TYPE_SOCKET:
+                rc = rtPathRmOneFile(pOpts, pszPath, &pDirEntry->Info);
+                break;
+
+            case RTFS_TYPE_WHITEOUT:
+            default:
+                rc = rtPathRmError(pOpts, pszPath, VERR_UNEXPECTED_FS_OBJ_TYPE,
+                                   "Object '%s' has an unknown file type: %o\n",
+                                   pszPath, pDirEntry->Info.Attr.fMode & RTFS_TYPE_MASK);
+                break;
+        }
+        if (RT_FAILURE(rc) && RT_SUCCESS(rcRet))
+            rcRet = rc;
+    }
+
+    /*
+     * Some error occured, close and return.
+     */
+    RTDirClose(hDir);
+    return rc;
+}
+
+/**
+ * Validates the specified file or directory.
+ *
+ * @returns IPRT status code, errors go via rtPathRmError.
+ * @param   pOpts               The RM options.
+ * @param   pszPath             The path to the file, directory, whatever.
+ */
+static int rtPathRmOneValidate(PRTPATHRMCMDOPTS pOpts, const char *pszPath)
+{
+    /*
+     * RTPathFilename doesn't do the trailing slash thing the way we need it to.
+     * E.g. both '..' and '../' should be rejected.
+     */
+    size_t cchPath = strlen(pszPath);
+    while (cchPath > 0 && RTPATH_IS_SLASH(pszPath[cchPath - 1]))
+        cchPath--;
+
+    if (   (  cchPath == 0
+            || 0 /** @todo drive letter + UNC crap */)
+        && pOpts->fPreserveRoot)
+        return rtPathRmError(pOpts, pszPath, VERR_CANT_DELETE_DIRECTORY, "Cannot remove root directory ('%s').\n", pszPath);
+
+    size_t offLast = cchPath - 1;
+    while (offLast > 0 && !RTPATH_IS_SEP(pszPath[offLast - 1]))
+        offLast--;
+
+    size_t cchLast = cchPath - offLast;
+    if (   pszPath[offLast] == '.'
+        && (   cchLast == 1
+            || (cchLast == 2 && pszPath[offLast + 1] == '.')))
+        return rtPathRmError(pOpts, pszPath, VERR_CANT_DELETE_DIRECTORY, "Cannot remove special directory '%s'.\n", pszPath);
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Remove one user specified file or directory.
+ *
+ * @returns IPRT status code, errors go via rtPathRmError.
+ * @param   pOpts               The RM options.
+ * @param   pszPath             The path to the file, directory, whatever.
+ */
+static int rtPathRmOne(PRTPATHRMCMDOPTS pOpts, const char *pszPath)
+{
+    /*
+     * RM refuses to delete some directories.
+     */
+    int rc = rtPathRmOneValidate(pOpts, pszPath);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    /*
+     * Query file system object info.
+     */
+    RTFSOBJINFO ObjInfo;
+    rc = RTPathQueryInfoEx(pszPath, &ObjInfo, RTFSOBJATTRADD_UNIX, RTPATH_F_ON_LINK);
+    if (RT_FAILURE(rc))
+    {
+        if (pOpts->fForce && (rc == VERR_FILE_NOT_FOUND || rc == VERR_PATH_NOT_FOUND))
+            return VINF_SUCCESS;
+        return rtPathRmError(pOpts, pszPath, rc, "Error deleting '%s': %Rrc", pszPath, rc);
+    }
+
+    /*
+     * Take type specific action.
+     */
+    switch (ObjInfo.Attr.fMode & RTFS_TYPE_MASK)
+    {
+        case RTFS_TYPE_FILE:
+            return rtPathRmOneFile(pOpts, pszPath, &ObjInfo);
+
+        case RTFS_TYPE_DIRECTORY:
+            if (pOpts->fRecursive)
+            {
+                char szPath[RTPATH_MAX];
+                rc = RTPathAbs(pszPath, szPath, sizeof(szPath));
+                if (RT_FAILURE(rc))
+                    return rtPathRmError(pOpts, pszPath, rc, "RTPathAbs failed on '%s': %Rrc\n", pszPath, rc);
+
+                union
+                {
+                    RTDIRENTRYEX    Core;
+                    uint8_t         abPadding[RTPATHRM_DIR_MAX_ENTRY_SIZE];
+                } DirEntry;
+
+                return rtPathRmRecursive(pOpts, szPath, strlen(szPath), &DirEntry.Core);
+            }
+            if (pOpts->fDirsAndOther)
+                return rtPathRmOneDir(pOpts, pszPath);
+            return rtPathRmError(pOpts, pszPath, VERR_IS_A_DIRECTORY, "Cannot remove '%s': %Rrc\n", pszPath, VERR_IS_A_DIRECTORY);
+
+        case RTFS_TYPE_SYMLINK:
+            return rtPathRmOneSymlink(pOpts, pszPath);
+
+        case RTFS_TYPE_FIFO:
+        case RTFS_TYPE_DEV_CHAR:
+        case RTFS_TYPE_DEV_BLOCK:
+        case RTFS_TYPE_SOCKET:
+            return rtPathRmOneFile(pOpts, pszPath, &ObjInfo);
+
+        case RTFS_TYPE_WHITEOUT:
+        default:
+            return rtPathRmError(pOpts, pszPath, VERR_UNEXPECTED_FS_OBJ_TYPE,
+                                 "Object '%s' has an unknown file type: %o\n", pszPath, ObjInfo.Attr.fMode & RTFS_TYPE_MASK);
+
+    }
+}
+
+
+RTDECL(RTEXITCODE) RTPathRmCmd(unsigned cArgs, char **papszArgs)
+{
+    /*
+     * Parse the command line.
+     */
+    static const RTGETOPTDEF s_aOptions[] =
+    {
+        /* operations */
+        { "--dirs-and-more",        'd', RTGETOPT_REQ_NOTHING },
+        { "--force",                'f', RTGETOPT_REQ_NOTHING },
+        { "--prompt",               'i', RTGETOPT_REQ_NOTHING },
+        { "--prompt-once",          'I', RTGETOPT_REQ_NOTHING },
+        { "--interactive",      RTPATHRMCMD_OPT_INTERACTIVE, RTGETOPT_REQ_STRING },
+        { "--one-file-system",  RTPATHRMCMD_OPT_ONE_FILE_SYSTEM, RTGETOPT_REQ_NOTHING },
+        { "--preserve-root",    RTPATHRMCMD_OPT_PRESERVE_ROOT, RTGETOPT_REQ_NOTHING },
+        { "--no-preserve-root", RTPATHRMCMD_OPT_NO_PRESERVE_ROOT, RTGETOPT_REQ_NOTHING },
+        { "--recursive",            'R', RTGETOPT_REQ_NOTHING },
+        { "--recursive",            'r', RTGETOPT_REQ_NOTHING },
+        { "--safe-delete",          'P', RTGETOPT_REQ_NOTHING },
+        { "--verbose",              'v', RTGETOPT_REQ_NOTHING },
+
+        /* IPRT extensions */
+        { "--machine-readable", RTPATHRMCMD_OPT_MACHINE_READABLE, RTGETOPT_REQ_NOTHING },
+        { "--machinereadable",  RTPATHRMCMD_OPT_MACHINE_READABLE, RTGETOPT_REQ_NOTHING }, /* bad long option style */
+    };
+
+    RTGETOPTSTATE GetState;
+    int rc = RTGetOptInit(&GetState, cArgs, papszArgs, s_aOptions, RT_ELEMENTS(s_aOptions), 1,
+                          RTGETOPTINIT_FLAGS_OPTS_FIRST);
+    if (RT_FAILURE(rc))
+        return RTMsgErrorExit(RTEXITCODE_FAILURE, "RTGetOpt failed: %Rrc", rc);
+
+    RTPATHRMCMDOPTS Opts;
+    RT_ZERO(Opts);
+    Opts.fPreserveRoot  = true;
+    Opts.enmInteractive = RTPATHRMCMDINTERACTIVE_NONE;
+
+    RTGETOPTUNION   ValueUnion;
+    while (   (rc = RTGetOpt(&GetState, &ValueUnion)) != 0
+           && rc != VINF_GETOPT_NOT_OPTION)
+    {
+        switch (rc)
+        {
+            case 'd':
+                Opts.fDirsAndOther = true;
+                break;
+
+            case 'f':
+                Opts.fForce = true;
+                Opts.enmInteractive = RTPATHRMCMDINTERACTIVE_NONE;
+                break;
+
+            case 'i':
+                Opts.enmInteractive = RTPATHRMCMDINTERACTIVE_ALL;
+                break;
+
+            case 'I':
+                Opts.enmInteractive = RTPATHRMCMDINTERACTIVE_ONCE;
+                break;
+
+            case RTPATHRMCMD_OPT_INTERACTIVE:
+                if (!strcmp(ValueUnion.psz, "always"))
+                    Opts.enmInteractive = RTPATHRMCMDINTERACTIVE_ALL;
+                else if (!strcmp(ValueUnion.psz, "once"))
+                    Opts.enmInteractive = RTPATHRMCMDINTERACTIVE_ONCE;
+                else
+                    return RTMsgErrorExit(RTEXITCODE_SYNTAX, "Unknown --interactive option value: '%s'\n", ValueUnion.psz);
+                break;
+
+            case RTPATHRMCMD_OPT_ONE_FILE_SYSTEM:
+                Opts.fOneFileSystem = true;
+                break;
+
+            case RTPATHRMCMD_OPT_PRESERVE_ROOT:
+                Opts.fPreserveRoot = true;
+                break;
+
+            case RTPATHRMCMD_OPT_NO_PRESERVE_ROOT:
+                Opts.fPreserveRoot = false;
+                break;
+
+            case 'R':
+            case 'r':
+                Opts.fRecursive = true;
+                Opts.fDirsAndOther = true;
+                break;
+
+            case 'P':
+                Opts.fSafeDelete = true;
+                break;
+
+            case 'v':
+                Opts.fVerbose = true;
+                break;
+
+            case RTPATHRMCMD_OPT_MACHINE_READABLE:
+                Opts.fMachineReadable = true;
+                break;
+
+            case 'h':
+                RTPrintf("Usage: to be written\nOption dump:\n");
+                for (unsigned i = 0; i < RT_ELEMENTS(s_aOptions); i++)
+                    if (RT_C_IS_PRINT(s_aOptions[i].iShort))
+                        RTPrintf(" -%c,%s\n", s_aOptions[i].iShort, s_aOptions[i].pszLong);
+                    else
+                        RTPrintf(" %s\n", s_aOptions[i].pszLong);
+                return RTEXITCODE_SUCCESS;
+
+            case 'V':
+                RTPrintf("%sr%d\n", RTBldCfgVersion(), RTBldCfgRevision());
+                return RTEXITCODE_SUCCESS;
+
+            default:
+                return RTGetOptPrintError(rc, &ValueUnion);
+        }
+    }
+
+    /*
+     * Options we don't support.
+     */
+    if (Opts.fOneFileSystem)
+        return RTMsgErrorExit(RTEXITCODE_FAILURE, "The --one-file-system option is not yet implemented.\n");
+    if (Opts.enmInteractive != RTPATHRMCMDINTERACTIVE_NONE)
+        return RTMsgErrorExit(RTEXITCODE_FAILURE, "The -i, -I and --interactive options are not implemented yet.\n");
+
+    /*
+     * No files means error.
+     */
+    if (rc != VINF_GETOPT_NOT_OPTION && !Opts.fForce)
+        return RTMsgErrorExit(RTEXITCODE_FAILURE, "No files or directories specified.\n");
+
+    /*
+     * Machine readable init + header.
+     */
+    if (Opts.fMachineReadable)
+    {
+        int rc2 = RTStrmSetMode(g_pStdOut, true /*fBinary*/, false /*fCurrentCodeSet*/);
+        if (RT_FAILURE(rc2))
+            return RTMsgErrorExit(RTEXITCODE_FAILURE, "RTStrmSetMode failed: %Rrc.\n", rc2);
+        static const char s_achHeader[] = "hdr_id=rm\0hdr_ver=1";
+        RTStrmWrite(g_pStdOut, s_achHeader, sizeof(s_achHeader));
+    }
+
+    /*
+     * Delete the specified files/dirs/whatever.
+     */
+    RTEXITCODE rcExit = RTEXITCODE_SUCCESS;
+    while (rc == VINF_GETOPT_NOT_OPTION)
+    {
+        rc = rtPathRmOne(&Opts, ValueUnion.psz);
+        if (RT_FAILURE(rc))
+            rcExit = RTEXITCODE_FAILURE;
+
+        /* next */
+        rc = RTGetOpt(&GetState, &ValueUnion);
+    }
+    if (rc != 0)
+        rcExit = RTGetOptPrintError(rc, &ValueUnion);
+
+    /*
+     * Terminate the machine readable stuff.
+     */
+    if (Opts.fMachineReadable)
+    {
+        RTStrmWrite(g_pStdOut, "\0\0\0", 4);
+        rc = RTStrmFlush(g_pStdOut);
+        if (RT_FAILURE(rc) && rcExit == RTEXITCODE_SUCCESS)
+            rcExit = RTEXITCODE_FAILURE;
+    }
+
+    return rcExit;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathSkipRootSpec.cpp b/src/VBox/Runtime/common/path/RTPathSkipRootSpec.cpp
new file mode 100644
index 00000000..e16a3f80
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathSkipRootSpec.cpp
@@ -0,0 +1,51 @@
+/* $Id: RTPathSkipRootSpec.cpp $ */
+/** @file
+ * IPRT - RTPathSkipRootSpec
+ */
+
+/*
+ * Copyright (C) 2010-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include "internal/path.h"
+
+
+RTDECL(char *) RTPathSkipRootSpec(const char *pszPath)
+{
+    return (char *)&pszPath[rtPathRootSpecLen(pszPath)];
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathSplit.cpp b/src/VBox/Runtime/common/path/RTPathSplit.cpp
new file mode 100644
index 00000000..cbe2c1ed
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathSplit.cpp
@@ -0,0 +1,143 @@
+/* $Id: RTPathSplit.cpp $ */
+/** @file
+ * IPRT - RTPathSplit
+ */
+
+/*
+ * Copyright (C) 2013-2022 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 "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;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathSplitA.cpp b/src/VBox/Runtime/common/path/RTPathSplitA.cpp
new file mode 100644
index 00000000..b5829f0d
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathSplitA.cpp
@@ -0,0 +1,101 @@
+/* $Id: RTPathSplitA.cpp $ */
+/** @file
+ * IPRT - RTPathSplitA and RTPathSplitFree.
+ */
+
+/*
+ * Copyright (C) 2013-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+
+
+
+RTDECL(int) RTPathSplitATag(const char *pszPath, PRTPATHSPLIT *ppSplit, uint32_t fFlags, const char *pszTag)
+{
+    AssertPtrReturn(ppSplit, VERR_INVALID_POINTER);
+    *ppSplit = NULL;
+
+    /*
+     * Try estimate a reasonable buffer size based on the path length.
+     * Note! No point in trying very hard to get it right.
+     */
+    size_t cbSplit = strlen(pszPath);
+    cbSplit += RT_UOFFSETOF_DYN(RTPATHSPLIT, apszComps[cbSplit / 8]) + cbSplit / 8 + 8;
+    cbSplit = RT_ALIGN(cbSplit, 64);
+    PRTPATHSPLIT pSplit = (PRTPATHSPLIT)RTMemAllocTag(cbSplit, pszTag);
+    if (pSplit == NULL)
+        return VERR_NO_MEMORY;
+
+    /*
+     * First try. If it fails due to buffer, reallocate the buffer and try again.
+     */
+    int rc = RTPathSplit(pszPath, pSplit, cbSplit, fFlags);
+    if (rc == VERR_BUFFER_OVERFLOW)
+    {
+        cbSplit = RT_ALIGN(pSplit->cbNeeded, 64);
+        RTMemFree(pSplit);
+
+        pSplit = (PRTPATHSPLIT)RTMemAllocTag(cbSplit, pszTag);
+        if (pSplit == NULL)
+            return VERR_NO_MEMORY;
+        rc = RTPathSplit(pszPath, pSplit, cbSplit, fFlags);
+    }
+
+    /*
+     * Done (one way or the other).
+     */
+    if (RT_SUCCESS(rc))
+        *ppSplit = pSplit;
+    else
+        RTMemFree(pSplit);
+    return rc;
+}
+
+
+RTDECL(void) RTPathSplitFree(PRTPATHSPLIT pSplit)
+{
+    if (pSplit)
+    {
+        Assert(pSplit->u16Reserved = UINT16_C(0xbeef));
+        RTMemFree(pSplit);
+    }
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathSplitReassemble.cpp b/src/VBox/Runtime/common/path/RTPathSplitReassemble.cpp
new file mode 100644
index 00000000..0bac8984
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathSplitReassemble.cpp
@@ -0,0 +1,130 @@
+/* $Id: RTPathSplitReassemble.cpp $ */
+/** @file
+ * IPRT - RTPathSplitReassemble.
+ */
+
+/*
+ * Copyright (C) 2013-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+
+
+RTDECL(int) RTPathSplitReassemble(PRTPATHSPLIT pSplit, uint32_t fFlags, char *pszDstPath, size_t cbDstPath)
+{
+    /*
+     * Input validation.
+     */
+    AssertPtrReturn(pSplit, VERR_INVALID_POINTER);
+    AssertReturn(pSplit->cComps > 0, VERR_INVALID_PARAMETER);
+    AssertReturn(RTPATH_STR_F_IS_VALID(fFlags, 0) && !(fFlags & RTPATH_STR_F_MIDDLE), VERR_INVALID_FLAGS);
+    AssertPtrReturn(pszDstPath, VERR_INVALID_POINTER);
+    AssertReturn(cbDstPath > pSplit->cchPath, VERR_BUFFER_OVERFLOW);
+
+    /*
+     * Figure which slash to use.
+     */
+    char chSlash;
+    switch (fFlags & RTPATH_STR_F_STYLE_MASK)
+    {
+        case RTPATH_STR_F_STYLE_HOST:
+            chSlash = RTPATH_SLASH;
+            break;
+
+        case RTPATH_STR_F_STYLE_DOS:
+            chSlash = '\\';
+            break;
+
+        case RTPATH_STR_F_STYLE_UNIX:
+            chSlash = '/';
+            break;
+
+        default:
+            AssertFailedReturn(VERR_INVALID_FLAGS); /* impossible */
+    }
+
+    /*
+     * Do the joining.
+     */
+    uint32_t const  cchOrgPath = pSplit->cchPath;
+    size_t          cchDstPath = 0;
+    uint32_t const  cComps     = pSplit->cComps;
+    uint32_t        idxComp    = 0;
+    char           *pszDst     = pszDstPath;
+    size_t          cchComp;
+
+    if (RTPATH_PROP_HAS_ROOT_SPEC(pSplit->fProps))
+    {
+        cchComp = strlen(pSplit->apszComps[0]);
+        cchDstPath += cchComp;
+        AssertReturn(cchDstPath <= cchOrgPath, VERR_INVALID_PARAMETER);
+        memcpy(pszDst, pSplit->apszComps[0], cchComp);
+
+        /* fix the slashes */
+        char chOtherSlash = chSlash == '\\' ? '/' : '\\';
+        while (cchComp-- > 0)
+        {
+            if (*pszDst == chOtherSlash)
+                *pszDst = chSlash;
+            pszDst++;
+        }
+        idxComp = 1;
+    }
+
+    while (idxComp < cComps)
+    {
+        cchComp = strlen(pSplit->apszComps[idxComp]);
+        cchDstPath += cchComp;
+        AssertReturn(cchDstPath <= cchOrgPath, VERR_INVALID_PARAMETER);
+        memcpy(pszDst, pSplit->apszComps[idxComp], cchComp);
+        pszDst += cchComp;
+        idxComp++;
+        if (idxComp != cComps || (pSplit->fProps & RTPATH_PROP_DIR_SLASH))
+        {
+            cchDstPath++;
+            AssertReturn(cchDstPath <= cchOrgPath, VERR_INVALID_PARAMETER);
+            *pszDst++ = chSlash;
+        }
+    }
+
+    *pszDst = '\0';
+
+    return VINF_SUCCESS;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathStartsWithRoot.cpp b/src/VBox/Runtime/common/path/RTPathStartsWithRoot.cpp
new file mode 100644
index 00000000..b6343d10
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathStartsWithRoot.cpp
@@ -0,0 +1,51 @@
+/* $Id: RTPathStartsWithRoot.cpp $ */
+/** @file
+ * IPRT - RTPathStartsWithRoot
+ */
+
+/*
+ * Copyright (C) 2010-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include "internal/path.h"
+
+
+RTDECL(bool) RTPathStartsWithRoot(const char *pszPath)
+{
+    return rtPathRootSpecLen(pszPath) > 0;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathStripExt.cpp b/src/VBox/Runtime/common/path/RTPathStripExt.cpp
new file mode 100644
index 00000000..f1bbb420
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathStripExt.cpp
@@ -0,0 +1,53 @@
+/* $Id: RTPathStripExt.cpp $ */
+/** @file
+ * IPRT - RTPathStripSuffix
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+#include <iprt/string.h>
+
+
+
+RTDECL(void) RTPathStripSuffix(char *pszPath)
+{
+    char *pszSuffix = RTPathSuffix(pszPath);
+    if (pszSuffix)
+        *pszSuffix = '\0';
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathStripFilename.cpp b/src/VBox/Runtime/common/path/RTPathStripFilename.cpp
new file mode 100644
index 00000000..823cb8cd
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathStripFilename.cpp
@@ -0,0 +1,99 @@
+/* $Id: RTPathStripFilename.cpp $ */
+/** @file
+ * IPRT - RTPathStripFilename
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+#include <iprt/ctype.h>
+
+
+/**
+ * Strips the filename from a path. Truncates the given string in-place by overwriting the
+ * last path separator character with a null byte in a platform-neutral way.
+ *
+ * @param   pszPath     Path from which filename should be extracted, will be truncated.
+ *                      If the string contains no path separator, it will be changed to a "." string.
+ */
+RTDECL(void) RTPathStripFilename(char *pszPath)
+{
+    char *psz = pszPath;
+    char *pszLastSep = NULL;
+
+
+    for (;; psz++)
+    {
+        switch (*psz)
+        {
+            /* handle separators. */
+#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
+            case ':':
+                pszLastSep = psz + 1;
+                if (RTPATH_IS_SLASH(psz[1]))
+                    pszPath = psz + 1;
+                else
+                    pszPath = psz;
+                break;
+
+            case '\\':
+#endif
+            case '/':
+                pszLastSep = psz;
+                break;
+
+            /* the end */
+            case '\0':
+                if (!pszLastSep)
+                {
+                    /* no directory component */
+                    pszPath[0] = '.';
+                    pszPath[1] = '\0';
+                }
+                else if (pszLastSep == pszPath)
+                {
+                    /* only root. */
+                    pszLastSep[1] = '\0';
+                }
+                else
+                    pszLastSep[0] = '\0';
+                return;
+        }
+    }
+    /* will never get here */
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathStripTrailingSlash.cpp b/src/VBox/Runtime/common/path/RTPathStripTrailingSlash.cpp
new file mode 100644
index 00000000..4ec145d4
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathStripTrailingSlash.cpp
@@ -0,0 +1,74 @@
+/* $Id: RTPathStripTrailingSlash.cpp $ */
+/** @file
+ * IPRT - RTPathSTripTrailingSlash
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+#include <iprt/string.h>
+#include <iprt/ctype.h>
+
+
+
+RTDECL(size_t) RTPathStripTrailingSlash(char *pszPath)
+{
+    size_t off = strlen(pszPath);
+    while (off > 1)
+    {
+        off--;
+        switch (pszPath[off])
+        {
+            case '/':
+#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
+            case '\\':
+                if (    off == 2
+                    &&  pszPath[1] == ':'
+                    &&  RT_C_IS_ALPHA(pszPath[0]))
+                    return off + 1;
+#endif
+                pszPath[off] = '\0';
+                break;
+
+            default:
+                return off + 1;
+        }
+    }
+
+    return 1;
+}
+
diff --git a/src/VBox/Runtime/common/path/RTPathTraverseList.cpp b/src/VBox/Runtime/common/path/RTPathTraverseList.cpp
new file mode 100644
index 00000000..89a71e26
--- /dev/null
+++ b/src/VBox/Runtime/common/path/RTPathTraverseList.cpp
@@ -0,0 +1,90 @@
+/* $Id: RTPathTraverseList.cpp $ */
+/** @file
+ * IPRT - RTPathTraverseList
+ */
+
+/*
+ * Copyright (C) 2009-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include <iprt/ctype.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+
+
+RTDECL(int) RTPathTraverseList(const char *pszPathList, char chSep, PFNRTPATHTRAVERSER pfnCallback, void *pvUser1, void *pvUser2)
+{
+    AssertPtrNull(pszPathList);
+    Assert((unsigned int)chSep <= 127);
+
+    if (!pszPathList)
+        return VERR_END_OF_STRING;
+
+    /*
+     * Walk the path list.
+     */
+    const char *psz = pszPathList;
+    while (*psz)
+    {
+        /* Skip leading blanks - no directories with leading spaces, thank you. */
+        while (RT_C_IS_BLANK(*psz))
+            psz++;
+
+        /* Find the end of this element. */
+        const char *pszNext;
+        const char *pszEnd = strchr(psz, chSep);
+        if (!pszEnd)
+            pszEnd = pszNext = strchr(psz, '\0');
+        else
+            pszNext = pszEnd + 1;
+        if (pszEnd != psz)
+        {
+            size_t const cch = pszEnd - psz;
+            int rc = pfnCallback(psz, cch, pvUser1, pvUser2);
+            if (rc != VERR_TRY_AGAIN)
+                return rc;
+        }
+
+        /* advance */
+        psz = pszNext;
+    }
+
+    return VERR_END_OF_STRING;
+}
+RT_EXPORT_SYMBOL(RTPathTraverseList);
+
diff --git a/src/VBox/Runtime/common/path/comparepaths.cpp b/src/VBox/Runtime/common/path/comparepaths.cpp
new file mode 100644
index 00000000..bde5bc27
--- /dev/null
+++ b/src/VBox/Runtime/common/path/comparepaths.cpp
@@ -0,0 +1,188 @@
+/* $Id: comparepaths.cpp $ */
+/** @file
+ * IPRT - Path Comparison.
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+#include <iprt/uni.h>
+
+
+/**
+ * Helper for RTPathCompare() and RTPathStartsWith().
+ *
+ * @returns similar to strcmp.
+ * @param   pszPath1        Path to compare.
+ * @param   pszPath2        Path to compare.
+ * @param   fLimit          Limit the comparison to the length of \a pszPath2
+ * @internal
+ */
+static int rtPathCompare(const char *pszPath1, const char *pszPath2, bool fLimit)
+{
+    if (pszPath1 == pszPath2)
+        return 0;
+    if (!pszPath1)
+        return -1;
+    if (!pszPath2)
+        return 1;
+
+#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
+    for (;;)
+    {
+        RTUNICP uc1;
+        int rc = RTStrGetCpEx(&pszPath1, &uc1);
+        if (RT_SUCCESS(rc))
+        {
+            RTUNICP uc2;
+            rc = RTStrGetCpEx(&pszPath2, &uc2);
+            if (RT_SUCCESS(rc))
+            {
+                if (uc1 == uc2)
+                {
+                    if (uc1)
+                    { /* likely */ }
+                    else
+                        return 0;
+                }
+                else
+                {
+                    if (uc1 == '\\')
+                        uc1 = '/';
+                    else
+                        uc1 = RTUniCpToUpper(uc1);
+                    if (uc2 == '\\')
+                        uc2 = '/';
+                    else
+                        uc2 = RTUniCpToUpper(uc2);
+                    if (uc1 != uc2)
+                    {
+                        if (fLimit && uc2 == '\0')
+                            return 0;
+                        return uc1 > uc2 ? 1 : -1; /* (overflow/underflow paranoia) */
+                    }
+                }
+            }
+            else
+                return 1;
+        }
+        else
+            return -1;
+    }
+#else
+    if (!fLimit)
+        return strcmp(pszPath1, pszPath2);
+    return strncmp(pszPath1, pszPath2, strlen(pszPath2));
+#endif
+}
+
+
+/**
+ * Compares two paths.
+ *
+ * The comparison takes platform-dependent details into account,
+ * such as:
+ * <ul>
+ * <li>On DOS-like platforms, both separator chars (|\| and |/|) are considered
+ *     to be equal.
+ * <li>On platforms with case-insensitive file systems, mismatching characters
+ *     are uppercased and compared again.
+ * </ul>
+ *
+ * @returns @< 0 if the first path less than the second path.
+ * @returns 0 if the first path identical to the second path.
+ * @returns @> 0 if the first path greater than the second path.
+ *
+ * @param   pszPath1    Path to compare (must be an absolute path).
+ * @param   pszPath2    Path to compare (must be an absolute path).
+ *
+ * @remarks File system details are currently ignored. This means that you won't
+ *          get case-insensitive compares on unix systems when a path goes into a
+ *          case-insensitive filesystem like FAT, HPFS, HFS, NTFS, JFS, or
+ *          similar. For NT, OS/2 and similar you'll won't get case-sensitive
+ *          compares on a case-sensitive file system.
+ */
+RTDECL(int) RTPathCompare(const char *pszPath1, const char *pszPath2)
+{
+    return rtPathCompare(pszPath1, pszPath2, false /* full path lengths */);
+}
+
+
+/**
+ * Checks if a path starts with the given parent path.
+ *
+ * This means that either the path and the parent path matches completely, or
+ * that the path is to some file or directory residing in the tree given by the
+ * parent directory.
+ *
+ * The path comparison takes platform-dependent details into account,
+ * see RTPathCompare() for details.
+ *
+ * @returns |true| when \a pszPath starts with \a pszParentPath (or when they
+ *          are identical), or |false| otherwise.
+ *
+ * @param   pszPath         Path to check, must be an absolute path.
+ * @param   pszParentPath   Parent path, must be an absolute path.
+ *                          No trailing directory slash!
+ */
+RTDECL(bool) RTPathStartsWith(const char *pszPath, const char *pszParentPath)
+{
+    if (pszPath == pszParentPath)
+        return true;
+    if (!pszPath || !pszParentPath)
+        return false;
+
+    if (rtPathCompare(pszPath, pszParentPath, true /* limited by path 2 */) != 0)
+        return false;
+
+    const size_t cchParentPath = strlen(pszParentPath);
+    if (RTPATH_IS_SLASH(pszPath[cchParentPath]))
+        return true;
+    if (pszPath[cchParentPath] == '\0')
+        return true;
+
+    /* Deal with pszParentPath = root (or having a trailing slash). */
+    if (   cchParentPath > 0
+        && RTPATH_IS_SLASH(pszParentPath[cchParentPath - 1])
+        && RTPATH_IS_SLASH(pszPath[cchParentPath - 1]))
+        return true;
+
+    return false;
+}
+
diff --git a/src/VBox/Runtime/common/path/nocrt-access.cpp b/src/VBox/Runtime/common/path/nocrt-access.cpp
new file mode 100644
index 00000000..161d54ff
--- /dev/null
+++ b/src/VBox/Runtime/common/path/nocrt-access.cpp
@@ -0,0 +1,78 @@
+/* $Id: nocrt-access.cpp $ */
+/** @file
+ * IPRT - No-CRT - access().
+ */
+
+/*
+ * Copyright (C) 2022 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                                                                                                                 *
+*********************************************************************************************************************************/
+#define IPRT_NO_CRT_FOR_3RD_PARTY
+#include "internal/nocrt.h"
+#include <iprt/nocrt/unistd.h>
+#include <iprt/nocrt/errno.h>
+#include <iprt/errcore.h>
+#include <iprt/path.h>
+
+
+#undef access
+int RT_NOCRT(access)(const char *pszPath, int fFlags) RT_NOEXCEPT
+{
+    RTFSOBJINFO ObjInfo;
+    int rc = RTPathQueryInfo(pszPath, &ObjInfo, RTFSOBJATTRADD_UNIX);
+    if (RT_SUCCESS(rc))
+    {
+        if (fFlags == F_OK)
+            return 0;
+        rc = 0;
+#if defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)
+        /** @todo A proper answer on windows would require reading the security
+         *        attributes and stuff. Faking it for now. */
+        if ((fFlags & W_OK) && (ObjInfo.Attr.fMode & RTFS_DOS_READONLY) && !RTFS_IS_DIRECTORY(ObjInfo.Attr.fMode))
+            rc = -1;
+        else if ((fFlags & X_OK) && !(ObjInfo.Attr.fMode & (RTFS_UNIX_IXOTH | RTFS_UNIX_IXGRP | RTFS_UNIX_IXUSR)))
+            rc = -1;
+#else
+# error "port me"
+#endif
+        if (!rc)
+            return rc;
+        errno = EACCES;
+    }
+    else
+        errno = RTErrConvertToErrno(rc);
+    return -1;
+}
+RT_ALIAS_AND_EXPORT_NOCRT_SYMBOL(access);
+
diff --git a/src/VBox/Runtime/common/path/nocrt-unlink.cpp b/src/VBox/Runtime/common/path/nocrt-unlink.cpp
new file mode 100644
index 00000000..c93c352b
--- /dev/null
+++ b/src/VBox/Runtime/common/path/nocrt-unlink.cpp
@@ -0,0 +1,59 @@
+/* $Id: nocrt-unlink.cpp $ */
+/** @file
+ * IPRT - No-CRT - unlink().
+ */
+
+/*
+ * Copyright (C) 2022 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                                                                                                                 *
+*********************************************************************************************************************************/
+#define IPRT_NO_CRT_FOR_3RD_PARTY
+#include "internal/nocrt.h"
+#include <iprt/nocrt/unistd.h>
+#include <iprt/nocrt/errno.h>
+#include <iprt/errcore.h>
+#include <iprt/path.h>
+
+
+#undef unlink
+int RT_NOCRT(unlink)(const char *pszPath) RT_NOEXCEPT
+{
+    int rc = RTPathUnlink(pszPath, 0 /*fUnlink*/);
+    if (RT_SUCCESS(rc))
+        return 0;
+    errno = RTErrConvertToErrno(rc);
+    return -1;
+}
+RT_ALIAS_AND_EXPORT_NOCRT_SYMBOL(unlink);
+
diff --git a/src/VBox/Runtime/common/path/rtPathRootSpecLen.cpp b/src/VBox/Runtime/common/path/rtPathRootSpecLen.cpp
new file mode 100644
index 00000000..b948f8c7
--- /dev/null
+++ b/src/VBox/Runtime/common/path/rtPathRootSpecLen.cpp
@@ -0,0 +1,103 @@
+/* $Id: rtPathRootSpecLen.cpp $ */
+/** @file
+ * IPRT - rtPathRootSpecLen (internal).
+ */
+
+/*
+ * Copyright (C) 2010-2022 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 "internal/iprt.h"
+#include <iprt/path.h>
+
+#include <iprt/assert.h>
+#include <iprt/ctype.h>
+#include "internal/path.h"
+
+/**
+ * Figures out the length of the root (or drive) specifier in @a pszPath.
+ *
+ * For UNC names, we consider the root specifier to include both the server and
+ * share names.
+ *
+ * @returns The length including all slashes.  0 if relative path.
+ *
+ * @param   pszPath         The path to examine.
+ */
+DECLHIDDEN(size_t) rtPathRootSpecLen(const char *pszPath)
+{
+    /*
+     * If it's an absolute path, threat the root or volume specification as
+     * component 0.  UNC is making this extra fun on OS/2 and Windows as usual.
+     */
+    size_t off = 0;
+    if (RTPATH_IS_SLASH(pszPath[0]))
+    {
+#if defined(RT_OS_OS2) || defined(RT_OS_WINDOWS)
+        if (   RTPATH_IS_SLASH(pszPath[1])
+            && !RTPATH_IS_SLASH(pszPath[2])
+            && pszPath[2])
+        {
+            /* UNC server name */
+            off = 2;
+            while (!RTPATH_IS_SLASH(pszPath[off]) && pszPath[off])
+                off++;
+            while (RTPATH_IS_SLASH(pszPath[off]))
+                off++;
+
+            /* UNC share */
+            while (!RTPATH_IS_SLASH(pszPath[off]) && pszPath[off])
+                off++;
+        }
+        else
+#endif
+        {
+            off = 1;
+        }
+        while (RTPATH_IS_SLASH(pszPath[off]))
+            off++;
+    }
+#if defined(RT_OS_OS2) || defined(RT_OS_WINDOWS)
+    else if (RT_C_IS_ALPHA(pszPath[0]) && pszPath[1] == ':')
+    {
+        off = 2;
+        while (RTPATH_IS_SLASH(pszPath[off]))
+            off++;
+    }
+#endif
+    Assert(!RTPATH_IS_SLASH(pszPath[off]));
+
+    return off;
+}
+
diff --git a/src/VBox/Runtime/common/path/rtPathVolumeSpecLen.cpp b/src/VBox/Runtime/common/path/rtPathVolumeSpecLen.cpp
new file mode 100644
index 00000000..b0a65b63
--- /dev/null
+++ b/src/VBox/Runtime/common/path/rtPathVolumeSpecLen.cpp
@@ -0,0 +1,80 @@
+/* $Id: rtPathVolumeSpecLen.cpp $ */
+/** @file
+ * IPRT - rtPathVolumeSpecLen
+ */
+
+/*
+ * Copyright (C) 2006-2022 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 "internal/iprt.h"
+#include <iprt/string.h>
+#include <iprt/ctype.h>
+#include "internal/path.h"
+
+
+
+/**
+ * Returns the length of the volume name specifier of the given path.
+ * If no such specifier zero is returned.
+ */
+DECLHIDDEN(size_t) rtPathVolumeSpecLen(const char *pszPath)
+{
+#if defined (RT_OS_OS2) || defined (RT_OS_WINDOWS)
+    if (pszPath && *pszPath)
+    {
+        /* UNC path. */
+        /** @todo r=bird: it's UNC and we have to check that the next char isn't a
+         *        slash, then skip both the server and the share name. */
+        if (    (pszPath[0] == '\\' || pszPath[0] == '/')
+            &&  (pszPath[1] == '\\' || pszPath[1] == '/'))
+            return strcspn(pszPath + 2, "\\/") + 2;
+
+        /* Drive letter. */
+        if (    pszPath[1] == ':'
+            &&  RT_C_IS_ALPHA(pszPath[0]))
+            return 2;
+    }
+    return 0;
+
+#else
+    /* This isn't quite right when looking at the above stuff, but it works assuming that '//' does not mean UNC. */
+    /// @todo (dmik) well, it's better to consider there's no volume name
+    //  at all on *nix systems
+    NOREF(pszPath);
+    return 0;
+//    return pszPath && pszPath[0] == '/';
+#endif
+}
+
diff --git a/src/VBox/Runtime/common/path/rtpath-expand-template.cpp.h b/src/VBox/Runtime/common/path/rtpath-expand-template.cpp.h
new file mode 100644
index 00000000..20bb34f7
--- /dev/null
+++ b/src/VBox/Runtime/common/path/rtpath-expand-template.cpp.h
@@ -0,0 +1,92 @@
+/* $Id: rtpath-expand-template.cpp.h $ */
+/** @file
+ * IPRT - RTPath - Internal header that includes RTPATH_TEMPLATE_CPP_H multiple
+ *                 times to expand the code for different path styles.
+ */
+
+/*
+ * Copyright (C) 2006-2022 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
+ */
+
+#undef  RTPATH_DELIMITER
+
+/*
+ * DOS style
+ */
+#undef  RTPATH_STYLE
+#undef  RTPATH_SLASH
+#undef  RTPATH_SLASH_STR
+#undef  RTPATH_IS_SLASH
+#undef  RTPATH_IS_VOLSEP
+#undef  RTPATH_STYLE_FN
+
+#define RTPATH_STYLE            RTPATH_STR_F_STYLE_DOS
+#define RTPATH_SLASH            '\\'
+#define RTPATH_SLASH_STR        "\\"
+#define RTPATH_IS_SLASH(a_ch)   ( (a_ch) == '\\' || (a_ch) == '/' )
+#define RTPATH_IS_VOLSEP(a_ch)  ( (a_ch) == ':' )
+#define RTPATH_STYLE_FN(a_Name) a_Name ## StyleDos
+#include RTPATH_TEMPLATE_CPP_H
+
+/*
+ * Unix style.
+ */
+#undef  RTPATH_STYLE
+#undef  RTPATH_SLASH
+#undef  RTPATH_SLASH_STR
+#undef  RTPATH_IS_SLASH
+#undef  RTPATH_IS_VOLSEP
+#undef  RTPATH_STYLE_FN
+
+#define RTPATH_STYLE            RTPATH_STR_F_STYLE_UNIX
+#define RTPATH_SLASH            '/'
+#define RTPATH_SLASH_STR        "/"
+#define RTPATH_IS_SLASH(a_ch)   ( (a_ch) == '/' )
+#define RTPATH_IS_VOLSEP(a_ch)  ( false )
+#define RTPATH_STYLE_FN(a_Name) a_Name ## StyleUnix
+#include RTPATH_TEMPLATE_CPP_H
+
+/*
+ * Clean up and restore the host style.
+ */
+#undef RTPATH_STYLE_FN
+#if defined(RT_OS_OS2) || defined(RT_OS_WINDOWS)
+# undef  RTPATH_STYLE
+# undef  RTPATH_SLASH
+# undef  RTPATH_SLASH_STR
+# undef  RTPATH_IS_SLASH
+# undef  RTPATH_IS_VOLSEP
+# define RTPATH_STYLE           RTPATH_STR_F_STYLE_DOS
+# define RTPATH_SLASH           '\\'
+# define RTPATH_SLASH_STR       "\\"
+# define RTPATH_IS_SLASH(a_ch)  ( (a_ch) == '\\' || (a_ch) == '/' )
+# define RTPATH_IS_VOLSEP(a_ch) ( (a_ch) == ':' )
+#endif
+
diff --git a/src/VBox/Runtime/common/path/rtpath-root-length-template.cpp.h b/src/VBox/Runtime/common/path/rtpath-root-length-template.cpp.h
new file mode 100644
index 00000000..80de10fb
--- /dev/null
+++ b/src/VBox/Runtime/common/path/rtpath-root-length-template.cpp.h
@@ -0,0 +1,80 @@
+/* $Id: rtpath-root-length-template.cpp.h $ */
+/** @file
+ * IPRT - rtPathRootLengthEx - Code Template.
+ *
+ * Include this from a path-style template file.
+ */
+
+/*
+ * Copyright (C) 2019-2022 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/ctype.h>
+
+
+/**
+ * Inlined helper for determining the length of the root component.
+ */
+DECLINLINE(size_t) RTPATH_STYLE_FN(rtPathRootLengthEx)(const char *pszPath, uint32_t fFlags)
+{
+    if (RTPATH_IS_SLASH(pszPath[0]))
+    {
+        if (fFlags & RTPATH_STR_F_NO_START)
+            return 0;
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+        if (RTPATH_IS_SLASH(pszPath[1]))
+        {
+            /* UNC - there are exactly two prefix slashes followed by a namespace
+               or computer name, which can be empty on windows.  */
+            size_t cchRoot = 2;
+            while (!RTPATH_IS_SLASH(pszPath[cchRoot]) && pszPath[cchRoot])
+                cchRoot++;
+            if (RTPATH_IS_SLASH(pszPath[cchRoot]))
+                cchRoot++;
+            return cchRoot;
+        }
+#endif
+        return 1;
+    }
+#if RTPATH_STYLE == RTPATH_STR_F_STYLE_DOS
+    if (RT_C_IS_ALPHA(pszPath[0]) && pszPath[1] == ':')
+    {
+        if (!RTPATH_IS_SLASH(pszPath[2]))
+            return 2;
+        return 3;
+    }
+#endif
+    return 0;
+}
+