diff options
| -rw-r--r-- | src/common/settings.cpp | 78 |
1 files changed, 76 insertions, 2 deletions
diff --git a/src/common/settings.cpp b/src/common/settings.cpp index ff53e80bb..ed15b8b7d 100644 --- a/src/common/settings.cpp +++ b/src/common/settings.cpp @@ -1,7 +1,15 @@ // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project // SPDX-License-Identifier: GPL-2.0-or-later +#if __cpp_lib_chrono >= 201907L +#include <chrono> +#else +#include <ctime> +#include <limits> +#endif #include <string_view> +#include <fmt/chrono.h> +#include <fmt/core.h> #include "common/assert.h" #include "common/fs/path_util.h" @@ -15,7 +23,7 @@ static bool configuring_global = true; std::string GetTimeZoneString() { static constexpr std::array timezones{ - "auto", "default", "CET", "CST6CDT", "Cuba", "EET", "Egypt", "Eire", + "GMT", "GMT", "CET", "CST6CDT", "Cuba", "EET", "Egypt", "Eire", "EST", "EST5EDT", "GB", "GB-Eire", "GMT", "GMT+0", "GMT-0", "GMT0", "Greenwich", "Hongkong", "HST", "Iceland", "Iran", "Israel", "Jamaica", "Japan", "Kwajalein", "Libya", "MET", "MST", "MST7MDT", "Navajo", "NZ", "NZ-CHAT", @@ -25,7 +33,73 @@ std::string GetTimeZoneString() { const auto time_zone_index = static_cast<std::size_t>(values.time_zone_index.GetValue()); ASSERT(time_zone_index < timezones.size()); - return timezones[time_zone_index]; + std::string location_name; + switch (time_zone_index) { + case 0: { // Auto +#if __cpp_lib_chrono >= 201907L + const struct std::chrono::tzdb& time_zone_data = std::chrono::get_tzdb(); + const std::chrono::time_zone* current_zone = time_zone_data.current_zone(); + std::string_view current_zone_name = current_zone->name(); + location_name = current_zone_name; +#elif defined(MINGW) + // MinGW has broken strftime -- https://sourceforge.net/p/mingw-w64/bugs/793/ + // e.g. fmt::format("{:%z}") -- returns "Eastern Daylight Time" when it should be "-0400" + location_name = timezones[0]; + break; +#else + static constexpr std::array offsets{ + 0, 0, 3600, -21600, -19768, 7200, 7509, -1521, -18000, -18000, + -75, -75, 0, 0, 0, 0, 0, 27402, -36000, -968, + 12344, 8454, -18430, 33539, 40160, 3164, 3600, -25200, -25200, -25196, + 41944, 44028, 5040, -2205, 29143, -28800, 29160, 30472, 24925, 6952, + 0, 0, 0, 9017, 0, 0, + }; + + static constexpr std::array dst{ + false, false, true, true, true, true, true, true, false, true, true, true, + false, false, false, false, false, true, false, false, true, true, true, true, + false, true, true, false, true, true, true, true, true, true, true, true, + true, true, true, true, false, false, false, true, true, false, + }; + + const auto now = std::time(nullptr); + const struct std::tm& local = *std::localtime(&now); + const std::string clock_offset_s = fmt::format("{:%z}", local); + if (clock_offset_s.empty()) { + location_name = timezones[0]; + break; + } + const int hours_offset = std::stoi(clock_offset_s) / 100; + const int minutes_offset = std::stoi(clock_offset_s) - hours_offset * 100; + const int system_offset = + hours_offset * 3600 + minutes_offset * 60 - (local.tm_isdst ? 3600 : 0); + + int min = std::numeric_limits<int>::max(); + int min_index = -1; + for (u32 i = 2; i < offsets.size(); i++) { + // Skip if system is celebrating DST but considered time zone does not + if (local.tm_isdst && !dst[i]) { + continue; + } + + const auto offset = offsets[i]; + const int difference = std::abs(std::abs(offset) - std::abs(system_offset)); + if (difference < min) { + min = difference; + min_index = i; + } + } + + location_name = timezones[min_index]; +#endif + break; + } + default: + location_name = timezones[time_zone_index]; + break; + } + + return location_name; } void LogSettings() { |