set: Fix GetAvailableLanguageCodes implementation.

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

@@ -14,15 +14,33 @@ namespace Service::Set {
 void SET::GetAvailableLanguageCodes(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     u32 id = rp.Pop<u32>();
-    constexpr std::array<u8, 13> lang_codes{};
-
-    ctx.WriteBuffer(lang_codes.data(), lang_codes.size());
-
-    IPC::ResponseBuilder rb{ctx, 2};
 
+    static constexpr std::array<LanguageCode, 17> available_language_codes = {{
+        LanguageCode::JA,
+        LanguageCode::EN_US,
+        LanguageCode::FR,
+        LanguageCode::DE,
+        LanguageCode::IT,
+        LanguageCode::ES,
+        LanguageCode::ZH_CN,
+        LanguageCode::KO,
+        LanguageCode::NL,
+        LanguageCode::PT,
+        LanguageCode::RU,
+        LanguageCode::ZH_TW,
+        LanguageCode::EN_GB,
+        LanguageCode::FR_CA,
+        LanguageCode::ES_419,
+        LanguageCode::ZH_HANS,
+        LanguageCode::ZH_HANT,
+    }};
+    ctx.WriteBuffer(available_language_codes.data(), available_language_codes.size());
+
+    IPC::ResponseBuilder rb{ctx, 4};
     rb.Push(RESULT_SUCCESS);
+    rb.Push(static_cast<u64>(available_language_codes.size()));
 
-    NGLOG_WARNING(Service_SET, "(STUBBED) called");
+    NGLOG_DEBUG(Service_SET, "called");
 }
 
 SET::SET() : ServiceFramework("set") {

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

@@ -8,6 +8,27 @@
 
 namespace Service::Set {
 
+/// This is "nn::settings::LanguageCode", which is a NUL-terminated string stored in a u64.
+enum class LanguageCode : u64 {
+    JA = 0x000000000000616A,
+    EN_US = 0x00000053552D6E65,
+    FR = 0x0000000000007266,
+    DE = 0x0000000000006564,
+    IT = 0x0000000000007469,
+    ES = 0x0000000000007365,
+    ZH_CN = 0x0000004E432D687A,
+    KO = 0x0000000000006F6B,
+    NL = 0x0000000000006C6E,
+    PT = 0x0000000000007470,
+    RU = 0x0000000000007572,
+    ZH_TW = 0x00000057542D687A,
+    EN_GB = 0x00000042472D6E65,
+    FR_CA = 0x00000041432D7266,
+    ES_419 = 0x00003931342D7365,
+    ZH_HANS = 0x00736E61482D687A,
+    ZH_HANT = 0x00746E61482D687A,
+};
+
 class SET final : public ServiceFramework<SET> {
 public:
     explicit SET();