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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qglobal.h"
#include "qdebug.h"
#include "qlocale_p.h"
#include "qmutex.h"
#include "unicode/uloc.h"
#include "unicode/ustring.h"
QT_BEGIN_NAMESPACE
typedef int32_t (*Ptr_u_strToCase)(UChar *dest, int32_t destCapacity, const UChar *src, int32_t srcLength, const char *locale, UErrorCode *pErrorCode);
// caseFunc can either be u_strToUpper or u_strToLower
static bool qt_u_strToCase(const QString &str, QString *out, const char *localeID, Ptr_u_strToCase caseFunc)
{
Q_ASSERT(out);
int32_t size = str.size();
size += size >> 2; // add 25% for possible expansions
QString result(size, Qt::Uninitialized);
UErrorCode status = U_ZERO_ERROR;
size = caseFunc(reinterpret_cast<UChar *>(result.data()), result.size(),
reinterpret_cast<const UChar *>(str.constData()), str.size(),
localeID, &status);
if (U_FAILURE(status) && status != U_BUFFER_OVERFLOW_ERROR)
return false;
if (size < result.size()) {
result.resize(size);
} else if (size > result.size()) {
// the resulting string is larger than our source string
result.resize(size);
status = U_ZERO_ERROR;
size = caseFunc(reinterpret_cast<UChar *>(result.data()), result.size(),
reinterpret_cast<const UChar *>(str.constData()), str.size(),
localeID, &status);
if (U_FAILURE(status))
return false;
// if the sizes don't match now, we give up.
if (size != result.size())
return false;
}
*out = result;
return true;
}
QString QIcu::toUpper(const QByteArray &localeID, const QString &str, bool *ok)
{
QString out;
bool err = qt_u_strToCase(str, &out, localeID, u_strToUpper);
if (ok)
*ok = err;
return out;
}
QString QIcu::toLower(const QByteArray &localeID, const QString &str, bool *ok)
{
QString out;
bool err = qt_u_strToCase(str, &out, localeID, u_strToLower);
if (ok)
*ok = err;
return out;
}
QT_END_NAMESPACE
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