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settings: Always report a valid time zone
Prevents needing to deduce the non-Switch setting in core. Instead, we deduce the meaning of this setting where the heresy is committed, in common. settings: Remove strftime usage GetTimeZoneString: Use standard features Also forces GMT on MinGW due to broken strftime.
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9e2164be74
commit
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@ -1,7 +1,15 @@
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// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#if __cpp_lib_chrono >= 201907L
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#include <chrono>
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#else
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#include <ctime>
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#include <limits>
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#endif
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#include <string_view>
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#include <fmt/chrono.h>
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#include <fmt/core.h>
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#include "common/assert.h"
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#include "common/fs/path_util.h"
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@ -15,7 +23,7 @@ static bool configuring_global = true;
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std::string GetTimeZoneString() {
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static constexpr std::array timezones{
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"auto", "default", "CET", "CST6CDT", "Cuba", "EET", "Egypt", "Eire",
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"GMT", "GMT", "CET", "CST6CDT", "Cuba", "EET", "Egypt", "Eire",
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"EST", "EST5EDT", "GB", "GB-Eire", "GMT", "GMT+0", "GMT-0", "GMT0",
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"Greenwich", "Hongkong", "HST", "Iceland", "Iran", "Israel", "Jamaica", "Japan",
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"Kwajalein", "Libya", "MET", "MST", "MST7MDT", "Navajo", "NZ", "NZ-CHAT",
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@ -25,7 +33,73 @@ std::string GetTimeZoneString() {
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const auto time_zone_index = static_cast<std::size_t>(values.time_zone_index.GetValue());
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ASSERT(time_zone_index < timezones.size());
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return timezones[time_zone_index];
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std::string location_name;
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switch (time_zone_index) {
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case 0: { // Auto
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#if __cpp_lib_chrono >= 201907L
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const struct std::chrono::tzdb& time_zone_data = std::chrono::get_tzdb();
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const std::chrono::time_zone* current_zone = time_zone_data.current_zone();
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std::string_view current_zone_name = current_zone->name();
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location_name = current_zone_name;
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#elif defined(MINGW)
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// MinGW has broken strftime -- https://sourceforge.net/p/mingw-w64/bugs/793/
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// e.g. fmt::format("{:%z}") -- returns "Eastern Daylight Time" when it should be "-0400"
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location_name = timezones[0];
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break;
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#else
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static constexpr std::array offsets{
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0, 0, 3600, -21600, -19768, 7200, 7509, -1521, -18000, -18000,
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-75, -75, 0, 0, 0, 0, 0, 27402, -36000, -968,
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12344, 8454, -18430, 33539, 40160, 3164, 3600, -25200, -25200, -25196,
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41944, 44028, 5040, -2205, 29143, -28800, 29160, 30472, 24925, 6952,
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0, 0, 0, 9017, 0, 0,
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};
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static constexpr std::array dst{
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false, false, true, true, true, true, true, true, false, true, true, true,
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false, false, false, false, false, true, false, false, true, true, true, true,
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false, true, true, false, true, true, true, true, true, true, true, true,
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true, true, true, true, false, false, false, true, true, false,
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};
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const auto now = std::time(nullptr);
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const struct std::tm& local = *std::localtime(&now);
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const std::string clock_offset_s = fmt::format("{:%z}", local);
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if (clock_offset_s.empty()) {
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location_name = timezones[0];
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break;
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}
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const int hours_offset = std::stoi(clock_offset_s) / 100;
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const int minutes_offset = std::stoi(clock_offset_s) - hours_offset * 100;
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const int system_offset =
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hours_offset * 3600 + minutes_offset * 60 - (local.tm_isdst ? 3600 : 0);
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int min = std::numeric_limits<int>::max();
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int min_index = -1;
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for (u32 i = 2; i < offsets.size(); i++) {
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// Skip if system is celebrating DST but considered time zone does not
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if (local.tm_isdst && !dst[i]) {
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continue;
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}
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const auto offset = offsets[i];
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const int difference = std::abs(std::abs(offset) - std::abs(system_offset));
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if (difference < min) {
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min = difference;
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min_index = i;
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}
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}
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location_name = timezones[min_index];
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#endif
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break;
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}
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default:
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location_name = timezones[time_zone_index];
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break;
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}
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return location_name;
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}
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void LogSettings() {
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