79 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710// UNSUPPORTED: no-filesystem, no-localization, no-tzdb11 12// XFAIL: libcpp-has-no-experimental-tzdb13// XFAIL: availability-tzdb-missing14 15// <chrono>16 17// const time_zone* current_zone();18 19#include <chrono>20#include <cassert>21#include <stdlib.h>22#include <string_view>23#include <string>24 25#include "test_macros.h"26#include "assert_macros.h"27#include "concat_macros.h"28 29#ifdef _WIN3230static void set_tz(std::string zone) {31 // Note Windows does not have setenv, only putenv32 // https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/putenv-s-wputenv-s?view=msvc-17033 // Unlike POSIX it does not mention the string of putenv becomes part34 // of the environment.35 36 int status = _putenv_s("TZ", zone.c_str());37 assert(status == 0);38}39 40#else41static void set_tz(const std::string& zone) {42 int status = setenv("TZ", zone.c_str(), 1);43 assert(status == 0);44}45#endif46 47static void test_zone(const std::string& zone) {48 set_tz(zone);49 const std::chrono::time_zone* tz = std::chrono::current_zone();50 assert(tz);51 assert(tz->name() == zone);52}53 54static void test_link(const std::string& link, std::string_view zone) {55 set_tz(link);56 const std::chrono::time_zone* tz = std::chrono::current_zone();57 assert(tz);58 assert(tz->name() == zone);59}60 61int main(int, const char**) {62 const std::chrono::time_zone* tz = std::chrono::current_zone();63 // Returns a valid time zone, the value depends on the OS settings.64 assert(tz);65 // setting the environment to an invalid value returns the value of66 // the OS setting.67 set_tz("This is not a time zone");68 assert(tz == std::chrono::current_zone());69 70 const std::chrono::tzdb& db = std::chrono::get_tzdb();71 for (const auto& zone : db.zones)72 test_zone(std::string{zone.name()});73 74 for (const auto& link : db.links)75 test_link(std::string{link.name()}, link.target());76 77 return 0;78}79