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diff --git a/src/corelib/tools/qstringalgorithms_p.h b/src/corelib/tools/qstringalgorithms_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2014 Intel Corporation.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSTRINGALGORITHMS_P_H
+#define QSTRINGALGORITHMS_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of internal files.  This header file may change from version to version
+// without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qstring.h"
+#include "qlocale_p.h"      // for ascii_isspace
+
+QT_BEGIN_NAMESPACE
+
+template <typename StringType> struct QStringAlgorithms
+{
+    typedef typename StringType::value_type Char;
+    typedef typename StringType::size_type size_type;
+    typedef typename QtPrivate::remove_cv<StringType>::type NakedStringType;
+    static const bool isConst = QtPrivate::is_const<StringType>::value;
+
+    static inline bool isSpace(char ch) { return ascii_isspace(ch); }
+    static inline bool isSpace(QChar ch) { return ch.isSpace(); }
+
+    // Surrogate pairs are not handled in either of the functions below. That is
+    // not a problem because there are no space characters (Zs, Zl, Zp) outside the
+    // Basic Multilingual Plane.
+
+    static inline StringType trimmed_helper_inplace(NakedStringType &str, const Char *begin, const Char *end)
+    {
+        // in-place trimming:
+        Char *data = const_cast<Char *>(str.cbegin());
+        if (begin != data)
+            memmove(data, begin, (end - begin) * sizeof(Char));
+        str.resize(end - begin);
+        return qMove(str);
+    }
+
+    static inline StringType trimmed_helper_inplace(const NakedStringType &, const Char *, const Char *)
+    {
+        // can't happen
+        Q_UNREACHABLE();
+        return StringType();
+    }
+
+    static inline void trimmed_helper_positions(const Char *&begin, const Char *&end)
+    {
+        // skip white space from start
+        while (begin < end && isSpace(*begin))
+            begin++;
+        // skip white space from end
+        if (begin < end) {
+            while (begin < end && isSpace(end[-1]))
+                end--;
+        }
+    }
+
+    static inline StringType trimmed_helper(StringType &str)
+    {
+        const Char *begin = str.cbegin();
+        const Char *end = str.cend();
+        trimmed_helper_positions(begin, end);
+
+        if (begin == str.cbegin() && end == str.cend())
+            return str;
+        if (begin == end)
+            return StringType();
+        if (!isConst && str.isDetached())
+            return trimmed_helper_inplace(str, begin, end);
+        return StringType(begin, end - begin);
+    }
+
+    static inline StringType simplified_helper(StringType &str)
+    {
+        if (str.isEmpty())
+            return str;
+        const Char *src = str.cbegin();
+        const Char *end = str.cend();
+        NakedStringType result = isConst || !str.isDetached() ?
+                                     StringType(str.size(), Qt::Uninitialized) :
+                                     qMove(str);
+
+        Char *dst = const_cast<Char *>(result.cbegin());
+        Char *ptr = dst;
+        bool unmodified = true;
+        forever {
+            while (src != end && isSpace(*src))
+                ++src;
+            while (src != end && !isSpace(*src))
+                *ptr++ = *src++;
+            if (src == end)
+                break;
+            if (*src != QChar::Space)
+                unmodified = false;
+            *ptr++ = QChar::Space;
+        }
+        if (ptr != dst && ptr[-1] == QChar::Space)
+            --ptr;
+
+        int newlen = ptr - dst;
+        if (isConst && newlen == str.size() && unmodified) {
+            // nothing happened, return the original
+            return str;
+        }
+        result.resize(newlen);
+        return result;
+    }
+};
+
+QT_END_NAMESPACE
+
+#endif // QSTRINGALGORITHMS_P_H