1 files changed, 80 insertions, 0 deletions
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;
+}
+