1 files changed, 88 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/string/RTStrICmpAscii.cpp b/src/VBox/Runtime/common/string/RTStrICmpAscii.cpp
new file mode 100644
index 00000000..19ca6a26
--- /dev/null
+++ b/src/VBox/Runtime/common/string/RTStrICmpAscii.cpp
@@ -0,0 +1,88 @@
+/* $Id: RTStrICmpAscii.cpp $ */
+/** @file
+ * IPRT - RTStrICmpAscii.
+ */
+
+/*
+ * 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 <iprt/string.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/ctype.h>
+
+
+RTDECL(int) RTStrICmpAscii(const char *psz1, const char *psz2)
+{
+    if (psz1 == psz2)
+        return 0;
+    if (!psz1)
+        return -1;
+    if (!psz2)
+        return 1;
+
+    for (;;)
+    {
+        RTUNICP uc1;
+        int rc = RTStrGetCpEx(&psz1, &uc1);
+        if (RT_SUCCESS(rc))
+        {
+            unsigned char uch2 = *psz2++; Assert(uch2 < 0x80);
+
+            /* compare */
+            int iDiff = uc1 - uch2;
+            if (iDiff)
+            {
+                if (uc1 >= 0x80)
+                    return 1;
+
+                iDiff = RT_C_TO_LOWER(uc1) - RT_C_TO_LOWER(uch2); /* Return lower cased diff! */
+                if (iDiff)
+                    return iDiff;
+            }
+
+            if (uch2)
+            { /* likely */ }
+            else
+                return 0;
+        }
+        /* Hit some bad encoding, continue in case sensitive mode. */
+        else
+            return RTStrCmp(psz1 - 1, psz2);
+    }
+}
+RT_EXPORT_SYMBOL(RTStrICmpAscii);
+