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// Copyright 2017 The Crashpad Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "snapshot/posix/timezone.h"
#include <stdlib.h>
#include <sys/time.h>
#include <time.h>
#include <iterator>
#include <string>
#include "base/strings/stringprintf.h"
#include "gtest/gtest.h"
#include "test/errors.h"
namespace crashpad {
namespace test {
namespace {
class ScopedSetTZ {
public:
ScopedSetTZ(const std::string& tz) {
const char* old_tz = getenv(kTZ);
old_tz_set_ = old_tz;
if (old_tz_set_) {
old_tz_.assign(old_tz);
}
EXPECT_EQ(setenv(kTZ, tz.c_str(), 1), 0) << ErrnoMessage("setenv");
tzset();
}
ScopedSetTZ(const ScopedSetTZ&) = delete;
ScopedSetTZ& operator=(const ScopedSetTZ&) = delete;
~ScopedSetTZ() {
if (old_tz_set_) {
EXPECT_EQ(setenv(kTZ, old_tz_.c_str(), 1), 0) << ErrnoMessage("setenv");
} else {
EXPECT_EQ(unsetenv(kTZ), 0) << ErrnoMessage("unsetenv");
}
tzset();
}
private:
std::string old_tz_;
bool old_tz_set_;
static constexpr char kTZ[] = "TZ";
};
constexpr char ScopedSetTZ::kTZ[];
TEST(TimeZone, Basic) {
SystemSnapshot::DaylightSavingTimeStatus dst_status;
int standard_offset_seconds;
int daylight_offset_seconds;
std::string standard_name;
std::string daylight_name;
timeval snapshot_time;
ASSERT_EQ(gettimeofday(&snapshot_time, nullptr), 0);
internal::TimeZone(snapshot_time,
&dst_status,
&standard_offset_seconds,
&daylight_offset_seconds,
&standard_name,
&daylight_name);
// |standard_offset_seconds| gives seconds east of UTC, and |timezone| gives
// seconds west of UTC.
EXPECT_EQ(standard_offset_seconds, -timezone);
// In contemporary usage, most time zones have an integer hour offset from
// UTC, although several are at a half-hour offset, and two are at 15-minute
// offsets. Throughout history, other variations existed. See
// https://www.timeanddate.com/time/time-zones-interesting.html.
EXPECT_EQ(standard_offset_seconds % (15 * 60), 0)
<< "standard_offset_seconds " << standard_offset_seconds;
if (dst_status == SystemSnapshot::kDoesNotObserveDaylightSavingTime) {
EXPECT_EQ(daylight_offset_seconds, standard_offset_seconds);
EXPECT_EQ(daylight_name, standard_name);
} else {
EXPECT_EQ(daylight_offset_seconds % (15 * 60), 0)
<< "daylight_offset_seconds " << daylight_offset_seconds;
// In contemporary usage, dst_delta_seconds will almost always be one hour,
// except for Lord Howe Island, Australia, which uses a 30-minute delta.
// Throughout history, other variations existed. See
// https://www.timeanddate.com/time/dst/.
int dst_delta_seconds = daylight_offset_seconds - standard_offset_seconds;
if (dst_delta_seconds != 60 * 60 && dst_delta_seconds != 30 * 60) {
FAIL() << "dst_delta_seconds " << dst_delta_seconds;
}
EXPECT_NE(standard_name, daylight_name);
}
// Test a variety of time zones. Some of these observe daylight saving time,
// some don’t. Some used to but no longer do. Some have uncommon UTC offsets.
// standard_name and daylight_name can be nullptr where no name exists to
// verify, as may happen when some versions of the timezone database carry
// invented names and others do not.
static constexpr struct {
const char* tz;
bool observes_dst;
float standard_offset_hours;
float daylight_offset_hours;
const char* standard_name;
const char* daylight_name;
} kTestTimeZones[] = {
{"America/Anchorage", true, -9, -8, "AKST", "AKDT"},
{"America/Chicago", true, -6, -5, "CST", "CDT"},
{"America/Denver", true, -7, -6, "MST", "MDT"},
{"America/Halifax", true, -4, -3, "AST", "ADT"},
{"America/Los_Angeles", true, -8, -7, "PST", "PDT"},
{"America/New_York", true, -5, -4, "EST", "EDT"},
{"America/Phoenix", false, -7, -7, "MST", "MST"},
{"Asia/Karachi", false, 5, 5, "PKT", "PKT"},
{"Asia/Kolkata", false, 5.5, 5.5, "IST", "IST"},
{"Asia/Shanghai", false, 8, 8, "CST", "CST"},
{"Asia/Tokyo", false, 9, 9, "JST", "JST"},
// Australian timezone names have an optional "A" prefix, which is
// present for glibc and macOS, but missing on Android.
{"Australia/Adelaide", true, 9.5, 10.5, nullptr, nullptr},
{"Australia/Brisbane", false, 10, 10, nullptr, nullptr},
{"Australia/Darwin", false, 9.5, 9.5, nullptr, nullptr},
{"Australia/Eucla", false, 8.75, 8.75, nullptr, nullptr},
{"Australia/Lord_Howe", true, 10.5, 11, nullptr, nullptr},
{"Australia/Perth", false, 8, 8, nullptr, nullptr},
{"Australia/Sydney", true, 10, 11, nullptr, nullptr},
{"Europe/Bucharest", true, 2, 3, "EET", "EEST"},
{"Europe/London", true, 0, 1, "GMT", "BST"},
{"Europe/Paris", true, 1, 2, "CET", "CEST"},
{"Europe/Reykjavik", false, 0, 0, nullptr, nullptr},
{"Pacific/Auckland", true, 12, 13, "NZST", "NZDT"},
{"Pacific/Honolulu", false, -10, -10, "HST", "HST"},
{"UTC", false, 0, 0, "UTC", "UTC"},
};
for (size_t index = 0; index < std::size(kTestTimeZones); ++index) {
const auto& test_time_zone = kTestTimeZones[index];
const char* tz = test_time_zone.tz;
SCOPED_TRACE(base::StringPrintf("index %zu, tz %s", index, tz));
{
ScopedSetTZ set_tz(tz);
internal::TimeZone(snapshot_time,
&dst_status,
&standard_offset_seconds,
&daylight_offset_seconds,
&standard_name,
&daylight_name);
}
EXPECT_PRED2(
[](SystemSnapshot::DaylightSavingTimeStatus dst, bool observes) {
return (dst != SystemSnapshot::kDoesNotObserveDaylightSavingTime) ==
observes;
},
dst_status,
test_time_zone.observes_dst);
EXPECT_EQ(standard_offset_seconds,
test_time_zone.standard_offset_hours * 60 * 60);
EXPECT_EQ(daylight_offset_seconds,
test_time_zone.daylight_offset_hours * 60 * 60);
if (test_time_zone.standard_name) {
EXPECT_EQ(standard_name, test_time_zone.standard_name);
}
if (test_time_zone.daylight_name) {
EXPECT_EQ(daylight_name, test_time_zone.daylight_name);
}
}
}
} // namespace
} // namespace test
} // namespace crashpad