1 files changed, 80 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/string/RTStrNICmpAscii.cpp b/src/VBox/Runtime/common/string/RTStrNICmpAscii.cpp
new file mode 100644
index 00000000..4309e2a2
--- /dev/null
+++ b/src/VBox/Runtime/common/string/RTStrNICmpAscii.cpp
@@ -0,0 +1,80 @@
+/* $Id: RTStrNICmpAscii.cpp $ */
+/** @file
+ * IPRT - RTStrNICmpAscii.
+ */
+
+/*
+ * Copyright (C) 2010-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/string.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/ctype.h>
+
+
+RTDECL(int) RTStrNICmpAscii(const char *psz1, const char *psz2, size_t cchMax)
+{
+    if (cchMax == 0)
+        return 0;
+    if (psz1 == psz2)
+        return 0;
+    if (!psz1)
+        return -1;
+    if (!psz2)
+        return 1;
+
+    for (;;)
+    {
+        RTUNICP uc1;
+        int rc = RTStrGetCpNEx(&psz1, &cchMax, &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 && cchMax)
+            { /* likely */ }
+            else
+                return 0;
+        }
+        /* Hit some bad encoding, continue in case sensitive mode. */
+        else
+            return RTStrNCmp(psz1 - 1, psz2, cchMax + 1);
+    }
+}
+RT_EXPORT_SYMBOL(RTStrNICmpAscii);
+