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LibC: Implement tzset with time zone awareness in accordance with POSIX

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This commit is contained in:
Timothy Flynn 2022-01-24 14:42:51 -05:00 • committed by Linus Groh
parent 6095500263
commit b1ea585149
2 changed files with 100 additions and 5 deletions
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64
Tests/LibC/TestLibCTime.cpp
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@ -10,6 +10,25 @@
const auto expected_epoch = "Thu Jan 1 00:00:00 1970\n"sv;
class TimeZoneGuard {
public:
TimeZoneGuard()
: m_tz(getenv("TZ"))
{
}
~TimeZoneGuard()
{
if (m_tz)
setenv("TZ", m_tz, 1);
else
unsetenv("TZ");
}
private:
char const* m_tz { nullptr };
};
TEST_CASE(asctime)
{
time_t epoch = 0;
@ -41,3 +60,48 @@ TEST_CASE(ctime_r)
EXPECT_EQ(expected_epoch, StringView(result));
}
TEST_CASE(tzset)
{
TimeZoneGuard guard;
auto set_tz = [](char const* tz) {
setenv("TZ", tz, 1);
tzset();
};
set_tz("UTC");
EXPECT_EQ(timezone, 0);
EXPECT_EQ(altzone, 0);
EXPECT_EQ(daylight, 0);
EXPECT_EQ(tzname[0], "UTC"sv);
EXPECT_EQ(tzname[1], "UTC"sv);
set_tz("America/New_York");
EXPECT_EQ(timezone, 5 * 60 * 60);
EXPECT_EQ(altzone, 4 * 60 * 60);
EXPECT_EQ(daylight, 1);
EXPECT_EQ(tzname[0], "EST"sv);
EXPECT_EQ(tzname[1], "EDT"sv);
set_tz("America/Phoenix");
EXPECT_EQ(timezone, 7 * 60 * 60);
EXPECT_EQ(altzone, 7 * 60 * 60);
EXPECT_EQ(daylight, 0);
EXPECT_EQ(tzname[0], "MST"sv);
EXPECT_EQ(tzname[1], "MST"sv);
set_tz("America/Asuncion");
EXPECT_EQ(timezone, 4 * 60 * 60);
EXPECT_EQ(altzone, 3 * 60 * 60);
EXPECT_EQ(daylight, 1);
EXPECT_EQ(tzname[0], "-04"sv);
EXPECT_EQ(tzname[1], "-03"sv);
set_tz("CET");
EXPECT_EQ(timezone, -1 * 60 * 60);
EXPECT_EQ(altzone, -2 * 60 * 60);
EXPECT_EQ(daylight, 1);
EXPECT_EQ(tzname[0], "CET"sv);
EXPECT_EQ(tzname[1], "CEST"sv);
}