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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: no-filesystem, no-localization, no-tzdb
// XFAIL: libcpp-has-no-incomplete-tzdb
// XFAIL: availability-tzdb-missing
// <chrono>
// struct tzdb
// const time_zone* current_zone() const;
#include <cassert>
#include <chrono>
#include <string_view>
#include <stdlib.h>
#include "test_macros.h"
#include "assert_macros.h"
#include "concat_macros.h"
#ifdef _WIN32
static void set_tz(std::string zone) {
// Note Windows does not have setenv, only putenv
// https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/putenv-s-wputenv-s?view=msvc-170
// Unlike POSIX it does not mention the string of putenv becomes part
// of the environment.
int status = _putenv_s("TZ", zone.c_str(), 1);
assert(status == 0);
}
#else
static void set_tz(const std::string& zone) {
int status = setenv("TZ", zone.c_str(), 1);
assert(status == 0);
}
#endif
static void test_zone(const std::string& zone) {
set_tz(zone);
const std::chrono::time_zone* tz = std::chrono::get_tzdb().current_zone();
assert(tz);
assert(tz->name() == zone);
}
static void test_link(const std::string& link, std::string_view zone) {
set_tz(link);
const std::chrono::time_zone* tz = std::chrono::get_tzdb().current_zone();
assert(tz);
assert(tz->name() == zone);
}
int main(int, const char**) {
const std::chrono::time_zone* tz = std::chrono::get_tzdb().current_zone();
// Returns a valid time zone, the value depends on the OS settings.
assert(tz);
// setting the environment to an invalid value returns the value of
// the OS setting.
set_tz("This is not a time zone");
assert(tz == std::chrono::get_tzdb().current_zone());
const std::chrono::tzdb& db = std::chrono::get_tzdb();
for (const auto& zone : db.zones)
test_zone(std::string{zone.name()});
for (const auto& link : db.links)
test_link(std::string{link.name()}, link.target());
return 0;
}
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