feat(libc): export std::setw(int)

core/libs/prx/libc/src/LocaleSupport.cpp

@@ -311,6 +311,23 @@ void APS5_VABI _ZNSt8ios_baseD2Ev_nid_postfix(GuestLocale::IosBase* self) {
     self->locale = nullptr;
 }
 
+GuestLocale::IosBase* APS5_VABI SetStreamWidth(GuestLocale::IosBase* stream, std::int32_t width) {
+    if (stream == nullptr) throw std::invalid_argument("setw: null stream");
+    stream->width = width;
+    return stream;
+}
+
+struct StreamManipulator {
+    GuestLocale::IosBase* (APS5_VABI* function)(GuestLocale::IosBase*, std::int32_t);
+    std::int32_t argument;
+};
+
+static_assert(sizeof(StreamManipulator) == 0x10);
+
+StreamManipulator APS5_VABI _ZSt4setwi_nid_postfix(std::int32_t width) {
+    return {&SetStreamWidth, width};
+}
+
 // Dinkumware's static locale::_Init(bool) returns the global _Locimp, which the caller copies.
 GuestLocale::Implementation* APS5_VABI _ZNSt6locale5_InitEv_nid_postfix() {
     std::lock_guard<std::mutex> lock(g_localeInitMutex);

core/libs/tests/GuestLocale.cpp

@@ -17,6 +17,11 @@ void APS5_VABI _ZNSt6locale5facet9_RegisterEv_nid_postfix(GuestLocale::Facet* se
 void APS5_VABI _ZNSt8_LocinfoC1EPKc_nid_postfix(GuestLocale::LocinfoStorage* self, const char* localeName);
 void APS5_VABI _ZNSt8_LocinfoD1Ev_nid_postfix(GuestLocale::LocinfoStorage* self);
 void APS5_VABI _ZNSt8ios_baseD2Ev_nid_postfix(GuestLocale::IosBase* self);
+struct StreamManipulator {
+    GuestLocale::IosBase* (APS5_VABI* function)(GuestLocale::IosBase*, std::int32_t);
+    std::int32_t argument;
+};
+StreamManipulator APS5_VABI _ZSt4setwi_nid_postfix(std::int32_t width);
 const short* APS5_VABI _Getpctype_nid_postfix();
 const short* APS5_VABI _Getptolower_nid_postfix();
 const short* APS5_VABI _Getptoupper_nid_postfix();
@@ -147,6 +152,25 @@ static void CheckStreamDestruction() {
     Require(object.stream.locale == &_ZSt21_sceLibcClassicLocale_nid_postfix);
 }
 
+static void CheckStreamWidth() {
+    struct GuardedStream {
+        std::uint64_t before = 0x12345678;
+        GuestLocale::IosBase stream{};
+        std::uint64_t after = 0x87654321;
+    } object;
+    object.stream.flags = 0x4000;
+    object.stream.precision = 6;
+    const auto manipulator = _ZSt4setwi_nid_postfix(12);
+    Require(manipulator.argument == 12 && manipulator.function != nullptr);
+    Require(manipulator.function(&object.stream, manipulator.argument) == &object.stream);
+    Require(object.stream.width == 12 && object.stream.flags == 0x4000 && object.stream.precision == 6);
+    Require(object.before == 0x12345678 && object.after == 0x87654321);
+    const auto reset = _ZSt4setwi_nid_postfix(0);
+    reset.function(&object.stream, reset.argument);
+    Require(object.stream.width == 0);
+    RequireException([&] { manipulator.function(nullptr, manipulator.argument); });
+}
+
 static void CheckWideCaseTranslation() {
     const auto* lower = _Getptolower_nid_postfix();
     const auto* upper = _Getptoupper_nid_postfix();
@@ -175,6 +199,7 @@ int main() {
     CheckCharacterTables();
     CheckCharacterConversions();
     CheckStreamDestruction();
+    CheckStreamWidth();
     CheckWideCaseTranslation();
     _Locksyslock_nid_postfix();
     _Locksyslock_nid_postfix();