Service/time: implement posix time to calendar conversion

src/core/hle/service/time/time.cpp

@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <chrono>
+#include <ctime>
 #include "common/logging/log.h"
 #include "core/core_timing.h"
 #include "core/hle/ipc_helpers.h"
@@ -77,7 +78,7 @@ public:
             {3, nullptr, "LoadLocationNameList"},
             {4, &ITimeZoneService::LoadTimeZoneRule, "LoadTimeZoneRule"},
             {5, nullptr, "GetTimeZoneRuleVersion"},
-            {100, nullptr, "ToCalendarTime"},
+            {100, &ITimeZoneService::ToCalendarTime, "ToCalendarTime"},
             {101, &ITimeZoneService::ToCalendarTimeWithMyRule, "ToCalendarTimeWithMyRule"},
             {200, nullptr, "ToPosixTime"},
             {201, nullptr, "ToPosixTimeWithMyRule"},
@@ -86,9 +87,11 @@ public:
     }
 
 private:
+    LocationName location_name{"UTC"};
+    TimeZoneRule my_time_zone_rule{};
+
     void GetDeviceLocationName(Kernel::HLERequestContext& ctx) {
-        NGLOG_WARNING(Service_Time, "(STUBBED) called");
-        LocationName location_name{};
+        NGLOG_DEBUG(Service_Time, "called");
         IPC::ResponseBuilder rb{ctx, (sizeof(LocationName) / 4) + 2};
         rb.Push(RESULT_SUCCESS);
         rb.PushRaw(location_name);
@@ -103,23 +106,70 @@ private:
 
     void LoadTimeZoneRule(Kernel::HLERequestContext& ctx) {
         NGLOG_WARNING(Service_Time, "(STUBBED) called");
+
+        ctx.WriteBuffer(&my_time_zone_rule, sizeof(TimeZoneRule));
+
         IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(RESULT_SUCCESS);
     }
 
+    void ToCalendarTime(Kernel::HLERequestContext& ctx) {
+        IPC::RequestParser rp{ctx};
+        const u64 posix_time = rp.Pop<u64>();
+
+        NGLOG_WARNING(Service_Time, "(STUBBED) called, posix_time=0x{:016X}", posix_time);
+
+        TimeZoneRule time_zone_rule{};
+        auto buffer = ctx.ReadBuffer();
+        std::memcpy(&time_zone_rule, buffer.data(), buffer.size());
+
+        CalendarTime calendar_time{2018, 1, 1, 0, 0, 0};
+        CalendarAdditionalInfo additional_info{};
+
+        PosixToCalendar(posix_time, calendar_time, additional_info, time_zone_rule);
+
+        IPC::ResponseBuilder rb{ctx, 10};
+        rb.Push(RESULT_SUCCESS);
+        rb.PushRaw(calendar_time);
+        rb.PushRaw(additional_info);
+    }
+
     void ToCalendarTimeWithMyRule(Kernel::HLERequestContext& ctx) {
         IPC::RequestParser rp{ctx};
-        u64 posix_time = rp.Pop<u64>();
+        const u64 posix_time = rp.Pop<u64>();
 
         NGLOG_WARNING(Service_Time, "(STUBBED) called, posix_time=0x{:016X}", posix_time);
 
         CalendarTime calendar_time{2018, 1, 1, 0, 0, 0};
         CalendarAdditionalInfo additional_info{};
+
+        PosixToCalendar(posix_time, calendar_time, additional_info, my_time_zone_rule);
+
         IPC::ResponseBuilder rb{ctx, 10};
         rb.Push(RESULT_SUCCESS);
         rb.PushRaw(calendar_time);
         rb.PushRaw(additional_info);
     }
+
+    void PosixToCalendar(u64 posix_time, CalendarTime& calendar_time,
+                         CalendarAdditionalInfo& additional_info, const TimeZoneRule& /*rule*/) {
+        std::time_t t(posix_time);
+        std::tm* tm = std::localtime(&t);
+        if (!tm) {
+            return;
+        }
+        calendar_time.year = tm->tm_year + 1900;
+        calendar_time.month = tm->tm_mon + 1;
+        calendar_time.day = tm->tm_mday;
+        calendar_time.hour = tm->tm_hour;
+        calendar_time.minute = tm->tm_min;
+        calendar_time.second = tm->tm_sec;
+
+        additional_info.day_of_week = tm->tm_wday;
+        additional_info.day_of_year = tm->tm_yday;
+        std::memcpy(additional_info.name.data(), "UTC", sizeof("UTC"));
+        additional_info.utc_offset = 0;
+    }
 };
 
 void Module::Interface::GetStandardUserSystemClock(Kernel::HLERequestContext& ctx) {

src/core/hle/service/time/time.h

@@ -4,13 +4,13 @@
 
 #pragma once
 
+#include <array>
 #include "core/hle/service/service.h"
 
 namespace Service::Time {
 
-// TODO(Rozelette) RE this structure
 struct LocationName {
-    INSERT_PADDING_BYTES(0x24);
+    std::array<u8, 0x24> name;
 };
 static_assert(sizeof(LocationName) == 0x24, "LocationName is incorrect size");
 
@@ -25,26 +25,34 @@ struct CalendarTime {
 };
 static_assert(sizeof(CalendarTime) == 0x8, "CalendarTime structure has incorrect size");
 
-// TODO(Rozelette) RE this structure
 struct CalendarAdditionalInfo {
-    INSERT_PADDING_BYTES(0x18);
+    u32_le day_of_week;
+    u32_le day_of_year;
+    std::array<u8, 8> name;
+    INSERT_PADDING_BYTES(1);
+    s32_le utc_offset;
 };
 static_assert(sizeof(CalendarAdditionalInfo) == 0x18,
               "CalendarAdditionalInfo structure has incorrect size");
 
-// TODO(bunnei) RE this structure
-struct SystemClockContext {
-    INSERT_PADDING_BYTES(0x20);
+// TODO(mailwl) RE this structure
+struct TimeZoneRule {
+    INSERT_PADDING_BYTES(0x4000);
 };
-static_assert(sizeof(SystemClockContext) == 0x20,
-              "SystemClockContext structure has incorrect size");
 
 struct SteadyClockTimePoint {
-    u64 value;
+    u64_le value;
     INSERT_PADDING_WORDS(4);
 };
 static_assert(sizeof(SteadyClockTimePoint) == 0x18, "SteadyClockTimePoint is incorrect size");
 
+struct SystemClockContext {
+    u64_le offset;
+    SteadyClockTimePoint time_point;
+};
+static_assert(sizeof(SystemClockContext) == 0x20,
+              "SystemClockContext structure has incorrect size");
+
 class Module final {
 public:
     class Interface : public ServiceFramework<Interface> {