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-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14, c++17
10// UNSUPPORTED: no-filesystem, no-localization, no-tzdb
11
12// XFAIL: libcpp-has-no-experimental-tzdb
13// XFAIL: availability-tzdb-missing
14
15// <chrono>
16
17// struct tzdb
18
19// const time_zone* current_zone() const;
20
21#include <cassert>
22#include <chrono>
23#include <string_view>
24#include <stdlib.h>
25
26#include "test_macros.h"
27#include "assert_macros.h"
28#include "concat_macros.h"
29
30#ifdef _WIN32
31static void set_tz(std::string zone) {
32 // Note Windows does not have setenv, only putenv
33 // https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/putenv-s-wputenv-s?view=msvc-170
34 // Unlike POSIX it does not mention the string of putenv becomes part
35 // of the environment.
36
37 int status = _putenv_s("TZ", zone.c_str());
38 assert(status == 0);
39}
40
41#else
42static void set_tz(const std::string& zone) {
43 int status = setenv("TZ", zone.c_str(), 1);
44 assert(status == 0);
45}
46#endif
47
48static void test_zone(const std::string& zone) {
49 set_tz(zone);
50 const std::chrono::time_zone* tz = std::chrono::get_tzdb().current_zone();
51 assert(tz);
52 assert(tz->name() == zone);
53}
54
55static void test_link(const std::string& link, std::string_view zone) {
56 set_tz(link);
57 const std::chrono::time_zone* tz = std::chrono::get_tzdb().current_zone();
58 assert(tz);
59 assert(tz->name() == zone);
60}
61
62int main(int, const char**) {
63 const std::chrono::time_zone* tz = std::chrono::get_tzdb().current_zone();
64 // Returns a valid time zone, the value depends on the OS settings.
65 assert(tz);
66 // setting the environment to an invalid value returns the value of
67 // the OS setting.
68 set_tz("This is not a time zone");
69 assert(tz == std::chrono::get_tzdb().current_zone());
70
71 const std::chrono::tzdb& db = std::chrono::get_tzdb();
72 for (const auto& zone : db.zones)
73 test_zone(std::string{zone.name()});
74
75 for (const auto& link : db.links)
76 test_link(std::string{link.name()}, link.target());
77
78 return 0;
79}
80

source code of libcxx/test/std/time/time.zone/time.zone.db/time.zone.db.tzdb/current_zone.pass.cpp