1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the QtCore module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#include "qglobal.h"
41#include "qdebug.h"
42#include "qlocale_p.h"
43#include "qmutex.h"
44
45#include "unicode/uloc.h"
46#include "unicode/ustring.h"
47
48QT_BEGIN_NAMESPACE
49
50typedef int32_t (*Ptr_u_strToCase)(UChar *dest, int32_t destCapacity, const UChar *src, int32_t srcLength, const char *locale, UErrorCode *pErrorCode);
51
52// caseFunc can either be u_strToUpper or u_strToLower
53static bool qt_u_strToCase(const QString &str, QString *out, const char *localeID, Ptr_u_strToCase caseFunc)
54{
55 Q_ASSERT(out);
56
57 int32_t size = str.size();
58 size += size >> 2; // add 25% for possible expansions
59 QString result(size, Qt::Uninitialized);
60
61 UErrorCode status = U_ZERO_ERROR;
62
63 size = caseFunc(reinterpret_cast<UChar *>(result.data()), result.size(),
64 reinterpret_cast<const UChar *>(str.constData()), str.size(),
65 localeID, &status);
66
67 if (U_FAILURE(code: status) && status != U_BUFFER_OVERFLOW_ERROR)
68 return false;
69
70 if (size < result.size()) {
71 result.resize(size);
72 } else if (size > result.size()) {
73 // the resulting string is larger than our source string
74 result.resize(size);
75
76 status = U_ZERO_ERROR;
77 size = caseFunc(reinterpret_cast<UChar *>(result.data()), result.size(),
78 reinterpret_cast<const UChar *>(str.constData()), str.size(),
79 localeID, &status);
80
81 if (U_FAILURE(code: status))
82 return false;
83
84 // if the sizes don't match now, we give up.
85 if (size != result.size())
86 return false;
87 }
88
89 *out = result;
90 return true;
91}
92
93QString QIcu::toUpper(const QByteArray &localeID, const QString &str, bool *ok)
94{
95 QString out;
96 bool err = qt_u_strToCase(str, out: &out, localeID, u_strToUpper);
97 if (ok)
98 *ok = err;
99 return out;
100}
101
102QString QIcu::toLower(const QByteArray &localeID, const QString &str, bool *ok)
103{
104 QString out;
105 bool err = qt_u_strToCase(str, out: &out, localeID, u_strToLower);
106 if (ok)
107 *ok = err;
108 return out;
109}
110
111QT_END_NAMESPACE
112

source code of qtbase/src/corelib/text/qlocale_icu.cpp