1 files changed, 146 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/path/comparepaths.cpp b/src/VBox/Runtime/common/path/comparepaths.cpp
new file mode 100644
index 00000000..159f60d2
--- /dev/null
+++ b/src/VBox/Runtime/common/path/comparepaths.cpp
@@ -0,0 +1,146 @@
+/* $Id: comparepaths.cpp $ */
+/** @file
+ * IPRT - Path Comparison.
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   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
+}
+
+
+RTDECL(int) RTPathCompare(const char *pszPath1, const char *pszPath2)
+{
+    return rtPathCompare(pszPath1, pszPath2, false /* full path lengths */);
+}
+
+
+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;
+}
+