Implement RtlCopyString() and RtlCopyWideString() routines

xtoskrnl/rtl/widestr.c

@@ -187,6 +187,49 @@ RtlConcatenateWideString(OUT PWCHAR Destination,
     return DestString;
 }
 
+/**
+ * Copies a wide string from a buffer into another buffer, ensuring that the destination string is NULL-terminated.
+ *
+ * @param Destination
+ *        Supplies a pointer to the destination buffer.
+ *
+ * @param Source
+ *        Supplies a pointer to the source buffer.
+ *
+ * @param Length
+ *        Supplies the length of the wide string to copy.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+
+XTAPI
+VOID
+RtlCopyWideString(IN PWCHAR Destination,
+                  IN CONST PWCHAR Source,
+                  IN ULONG Length)
+{
+    ULONG Index;
+
+    /* Copy characters */
+    for(Index = 0; Index < Length; Index++)
+    {
+        /* Copy source character */
+        Destination[Index] = Source[Index];
+
+        /* Check if NULL terminated character found */
+        if(Source[Index] == L'\0')
+        {
+            /* End of source string reached */
+            break;
+        }
+    }
+
+    /* Make sure the destination string is terminated properly */
+    Destination[Index] = L'\0';
+}
+
 /**
  * Formats a wide string according to the given printf-alike format string.
  *