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 // 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 _WIN32 30 static void set_tz(std::string zone) { 31 // Note Windows does not have setenv, only putenv 32 // https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/putenv-s-wputenv-s?view=msvc-170 33 // Unlike POSIX it does not mention the string of putenv becomes part 34 // of the environment. 35 36 int status = _putenv_s("TZ", zone.c_str()); 37 assert(status == 0); 38 } 39 40 #else 41 static void set_tz(const std::string& zone) { 42 int status = setenv("TZ", zone.c_str(), 1); 43 assert(status == 0); 44 } 45 #endif 46 47 static 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 54 static 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 61 int 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 of 66 // 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