service: set: Fix GetSettingsItemValue

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

@@ -26,12 +26,9 @@ Service::PSC::Time::SystemClockContext g_report_ephemeral_clock_context{};
 template <typename T>
 T GetSettingsItemValue(std::shared_ptr<Service::Set::ISystemSettingsServer>& set_sys,
                        const char* category, const char* name) {
-    std::vector<u8> interval_buf;
-    auto res = set_sys->GetSettingsItemValueImpl(interval_buf, category, name);
-    ASSERT(res == ResultSuccess);
-
     T v{};
-    std::memcpy(&v, interval_buf.data(), sizeof(T));
+    auto res = set_sys->GetSettingsItemValueImpl(v, category, name);
+    ASSERT(res == ResultSuccess);
     return v;
 }
 

src/core/hle/service/set/system_settings_server.cpp

@@ -308,7 +308,7 @@ ISystemSettingsServer::ISystemSettingsServer(Core::System& system_)
     SetupSettings();
 
     m_system_settings.region_code =
-        static_cast<SystemRegionCode>(Settings::values.region_index.GetValue());
+        static_cast<SystemRegionCode>(::Settings::values.region_index.GetValue());
 
     // TODO: Remove this when starter applet is fully functional
     EulaVersion eula_version{
@@ -715,7 +715,7 @@ Result ISystemSettingsServer::GetSettingsItemValueSize(
 }
 
 Result ISystemSettingsServer::GetSettingsItemValue(
-    OutBuffer<BufferAttr_HipcMapAlias> out_data,
+    Out<u64> out_size, OutBuffer<BufferAttr_HipcMapAlias> out_data,
     InLargeData<SettingItemName, BufferAttr_HipcPointer> setting_category_buffer,
     InLargeData<SettingItemName, BufferAttr_HipcPointer> setting_name_buffer) {
     const std::string setting_category{Common::StringFromBuffer(*setting_category_buffer)};
@@ -723,7 +723,7 @@ Result ISystemSettingsServer::GetSettingsItemValue(
 
     LOG_INFO(Service_SET, "called, category={}, name={}", setting_category, setting_name);
 
-    R_RETURN(GetSettingsItemValueImpl(out_data, setting_category, setting_name));
+    R_RETURN(GetSettingsItemValueImpl(out_data, *out_size, setting_category, setting_name));
 }
 
 Result ISystemSettingsServer::GetTvSettings(Out<TvSettings> out_tv_settings) {
@@ -1363,13 +1363,16 @@ void ISystemSettingsServer::SetSaveNeeded() {
     m_save_needed = true;
 }
 
-Result ISystemSettingsServer::GetSettingsItemValueImpl(std::vector<u8>& out_value,
+Result ISystemSettingsServer::GetSettingsItemValueImpl(std::span<u8> out_value, u64& out_size,
                                                        const std::string& category,
                                                        const std::string& name) {
     auto settings{GetSettings()};
     R_UNLESS(settings.contains(category) && settings[category].contains(name), ResultUnknown);
 
-    out_value = settings[category][name];
+    ASSERT_MSG(out_value.size() >= settings[category][name].size(),
+               "Stored type is bigger than requested type");
+    out_size = std::min<u64>(settings[category][name].size(), out_value.size());
+    std::memcpy(out_value.data(), settings[category][name].data(), out_size);
     R_SUCCEED();
 }
 

src/core/hle/service/set/system_settings_server.h

@@ -34,20 +34,17 @@ public:
     explicit ISystemSettingsServer(Core::System& system_);
     ~ISystemSettingsServer() override;
 
-    Result GetSettingsItemValueImpl(std::vector<u8>& out_value, const std::string& category,
+    Result GetSettingsItemValueImpl(std::span<u8> out_value, u64& out_size,
-                                    const std::string& name);
+                                    const std::string& category, const std::string& name);
 
     template <typename T>
-    Result GetSettingsItemValueImpl(T& value, const std::string& category,
+    Result GetSettingsItemValueImpl(T& out_value, const std::string& category,
                                     const std::string& name) {
-        std::vector<u8> data;
+        u64 data_size{};
-        const auto result = GetSettingsItemValueImpl(data, category, name);
+        std::vector<u8> data(sizeof(T));
-        if (result.IsError()) {
+        R_TRY(GetSettingsItemValueImpl(data, data_size, category, name));
-            return result;
+        std::memcpy(&out_value, data.data(), data_size);
-        }
+        R_SUCCEED();
-        ASSERT(data.size() >= sizeof(T));
-        std::memcpy(&value, data.data(), sizeof(T));
-        return result;
     }
 
 public:
@@ -84,7 +81,7 @@ public:
         InLargeData<SettingItemName, BufferAttr_HipcPointer> setting_category_buffer,
         InLargeData<SettingItemName, BufferAttr_HipcPointer> setting_name_buf);
     Result GetSettingsItemValue(
-        OutBuffer<BufferAttr_HipcMapAlias> out_data,
+        Out<u64> out_size, OutBuffer<BufferAttr_HipcMapAlias> out_data,
         InLargeData<SettingItemName, BufferAttr_HipcPointer> setting_category_buffer,
         InLargeData<SettingItemName, BufferAttr_HipcPointer> setting_name_buffer);
     Result GetTvSettings(Out<TvSettings> out_tv_settings);