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diff --git a/src/corelib/text/qcollator_posix.cpp b/src/corelib/text/qcollator_posix.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2013 Aleix Pol Gonzalez <aleixpol@kde.org>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://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 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qcollator_p.h"
+#include "qstringlist.h"
+#include "qstring.h"
+
+#include <cstring>
+#include <cwchar>
+
+QT_BEGIN_NAMESPACE
+
+void QCollatorPrivate::init()
+{
+ if (!isC()) {
+ if (locale != QLocale())
+ qWarning("Only C and default locale supported with the posix collation implementation");
+ if (caseSensitivity != Qt::CaseSensitive)
+ qWarning("Case insensitive sorting unsupported in the posix collation implementation");
+ }
+ if (numericMode)
+ qWarning("Numeric mode unsupported in the posix collation implementation");
+ if (ignorePunctuation)
+ qWarning("Ignoring punctuation unsupported in the posix collation implementation");
+ dirty = false;
+}
+
+void QCollatorPrivate::cleanup()
+{
+}
+
+static void stringToWCharArray(QVarLengthArray<wchar_t> &ret, QStringView string)
+{
+ ret.resize(string.length());
+ int len = string.toWCharArray(ret.data());
+ ret.resize(len+1);
+ ret[len] = 0;
+}
+
+int QCollator::compare(QStringView s1, QStringView s2) const
+{
+ if (d->isC())
+ return s1.compare(s2, caseSensitivity());
+ if (d->dirty)
+ d->init();
+
+ QVarLengthArray<wchar_t> array1, array2;
+ stringToWCharArray(array1, s1);
+ stringToWCharArray(array2, s2);
+ return std::wcscoll(array1.constData(), array2.constData());
+}
+
+QCollatorSortKey QCollator::sortKey(const QString &string) const
+{
+ if (d->dirty)
+ d->init();
+
+ QVarLengthArray<wchar_t> original;
+ stringToWCharArray(original, string);
+ QVector<wchar_t> result(original.size());
+ if (d->isC()) {
+ std::copy(original.cbegin(), original.cend(), result.begin());
+ } else {
+ size_t size = std::wcsxfrm(result.data(), original.constData(), string.size());
+ if (size > uint(result.size())) {
+ result.resize(size+1);
+ size = std::wcsxfrm(result.data(), original.constData(), string.size());
+ }
+ result.resize(size+1);
+ result[size] = 0;
+ }
+ return QCollatorSortKey(new QCollatorSortKeyPrivate(std::move(result)));
+}
+
+int QCollatorSortKey::compare(const QCollatorSortKey &otherKey) const
+{
+ return std::wcscmp(d->m_key.constData(), otherKey.d->m_key.constData());
+}
+
+QT_END_NAMESPACE