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// Copyright (C) 2026 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include <QCalendar>
#include <QDate>
#include <QLatin1StringView>
#include <QLocale>
#include <QString>
// Enable reporting of the currently used format, e.g. when reproducing issues
// #define LOG_FORMAT
#ifdef LOG_FORMAT
#include <QDebug>
#endif
using namespace Qt::StringLiterals;
static constexpr struct {
QLatin1StringView format = {}; // isNull() => iterate FormatType
QCalendar::System calSys = QCalendar::System::Gregorian;
int baseYear = 1900;
} patterns[] = {
{},
{ {}, QCalendar::System::Julian },
{ {}, QCalendar::System::Milankovic },
#if QT_CONFIG(jalalicalendar)
{ {}, QCalendar::System::Jalali },
#endif
#if QT_CONFIG(islamiccivilcalendar)
{ {}, QCalendar::System::IslamicCivil },
#endif
{ ""_L1 }, // Accepts only an empty string, returns default
// Each supported format atom:
{ "yy"_L1, QCalendar::System::Gregorian, 2000 },
{ "yyyy"_L1 },
{ "M"_L1 },
{ "MM"_L1 },
{ "MMM"_L1 },
{ "MMMM"_L1 },
{ "d"_L1 },
{ "dd"_L1 },
{ "ddd"_L1 },
{ "dddd"_L1 },
// Specific formats (or date parts thereof):
{ "yyyyMMdd"_L1 }, // ISO8601
{ "yyMMdd"_L1, QCalendar::System::Gregorian, 1950 }, // ASN.1 UTC type
{ "yyyyMMdd"_L1 }, // ASN.1 generalized type
// Quote handling
{ "yyyy'-'MM'-'dd"_L1 }, // correctly matched quotes
{ "yyyy''MM''dd"_L1 }, // doubled quotes as literal quotes
{ "yyyy MMMM dddd'unmatched"_L1 }, // malformed - rejected
};
static constexpr QLatin1StringView locales[] = {
"C"_L1, "en-US"_L1, "fr-FR"_L1,
"ru-RU"_L1, "zh-CN"_L1, "ar-EG"_L1, "hi-IN"_L1, "ja-JP"_L1,
"ccp-BD"_L1, "ff-Adlm"_L1, // non-BMP digits
};
// libFuzzer entry-point for testing QLocale::toDate()
extern "C" int LLVMFuzzerTestOneInput(const char *Data, size_t Size)
{
const QString userString = QString::fromUtf8(Data, Size);
constexpr QLocale::FormatType formats[] = {
QLocale::LongFormat, QLocale::ShortFormat, QLocale::NarrowFormat
};
[[maybe_unused]] QDate date;
for (const auto &pattern : patterns) {
QCalendar cal(pattern.calSys);
if (!cal.isValid())
continue;
for (const auto loc : locales) {
QLocale locale(loc);
#ifdef LOG_FORMAT
qDebug() << "Trying format:" << pattern.format
<< "for locale:" << loc
<< "with base year:" << pattern.baseYear
<< "of calendar:" << cal.name();
#endif
if (pattern.format.isNull()) {
for (const auto form : formats)
date = locale.toDate(userString, form, cal, pattern.baseYear);
} else {
date = locale.toDate(userString, pattern.format, cal, pattern.baseYear);
}
}
}
return 0;
}