--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/main/CommandLine.java	Sun Aug 17 15:52:32 2014 +0100
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package com.sun.tools.javac.main;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.io.FileReader;
+import java.io.BufferedReader;
+import java.io.StreamTokenizer;
+import com.sun.tools.javac.util.ListBuffer;
+
+/**
+ * Various utility methods for processing Java tool command line arguments.
+ *
+ *  <p><b>This is NOT part of any supported API.
+ *  If you write code that depends on this, you do so at your own risk.
+ *  This code and its internal interfaces are subject to change or
+ *  deletion without notice.</b>
+ */
+public class CommandLine {
+    /**
+     * Process Win32-style command files for the specified command line
+     * arguments and return the resulting arguments. A command file argument
+     * is of the form '@file' where 'file' is the name of the file whose
+     * contents are to be parsed for additional arguments. The contents of
+     * the command file are parsed using StreamTokenizer and the original
+     * '@file' argument replaced with the resulting tokens. Recursive command
+     * files are not supported. The '@' character itself can be quoted with
+     * the sequence '@@'.
+     */
+    public static String[] parse(String[] args)
+        throws IOException
+    {
+        ListBuffer<String> newArgs = new ListBuffer<>();
+        for (String arg : args) {
+            if (arg.length() > 1 && arg.charAt(0) == '@') {
+                arg = arg.substring(1);
+                if (arg.charAt(0) == '@') {
+                    newArgs.append(arg);
+                } else {
+                    loadCmdFile(arg, newArgs);
+                }
+            } else {
+                newArgs.append(arg);
+            }
+        }
+        return newArgs.toList().toArray(new String[newArgs.length()]);
+    }
+
+    private static void loadCmdFile(String name, ListBuffer<String> args)
+        throws IOException
+    {
+        try (Reader r = new BufferedReader(new FileReader(name))) {
+            StreamTokenizer st = new StreamTokenizer(r);
+            st.resetSyntax();
+            st.wordChars(' ', 255);
+            st.whitespaceChars(0, ' ');
+            st.commentChar('#');
+            st.quoteChar('"');
+            st.quoteChar('\'');
+            while (st.nextToken() != StreamTokenizer.TT_EOF) {
+                args.append(st.sval);
+            }
+        }
+    }
+}