From 24f78f57cc6148c8a8dcb14fb27de3fb20918347 Mon Sep 17 00:00:00 2001
From: boykopovar <boykopovar@gmail.com>
Date: Sat, 22 Aug 2026 16:50:55 +0300
Subject: [PATCH] feat(libs): implement missing locale and mbstate stubs for
 libc

---
 core/libs/prx/libc/src/LocaleSupport.cpp | 143 ++++++++++++++++-------
 1 file changed, 101 insertions(+), 42 deletions(-)

diff --git a/core/libs/prx/libc/src/LocaleSupport.cpp b/core/libs/prx/libc/src/LocaleSupport.cpp
index 8fbaec5f3..c0a4511e7 100644
--- a/core/libs/prx/libc/src/LocaleSupport.cpp
+++ b/core/libs/prx/libc/src/LocaleSupport.cpp
@@ -1,72 +1,131 @@
 #include <cstddef>
 #include <cstdint>
+#include <cwchar>
+#include <cwctype>
 #include <ios>
 #include <locale>
 #include <mutex>
 
 namespace {
 
-    std::mutex g_localeInitMutex;
-    bool g_localeInitialized = false;
+std::mutex g_localeInitMutex;
+bool g_localeInitialized = false;
 
-    constexpr std::size_t LocinfoStorageSize = 64;
+constexpr std::size_t LocinfoStorageSize = 64;
 
-    struct LocinfoStorage {
-        alignas(std::max_align_t) unsigned char bytes[LocinfoStorageSize];
-    };
+struct LocinfoStorage {
+    alignas(std::max_align_t) unsigned char bytes[LocinfoStorageSize];
+};
+
+const std::locale& ClassicLocaleInstance() {
+    static const std::locale instance = std::locale::classic();
+    return instance;
+}
 
 }
 
 extern "C" {
 
-    std::streamoff _ZSt7_BADOFF_nid_postfix = -1;
-    std::fpos_t _ZSt4_Fpz_nid_postfix {};
-    long _ZNSt6locale2id7_Id_cntE_nid_postfix = 0;
+std::streamoff _ZSt7_BADOFF_nid_postfix = -1;
+std::fpos_t _ZSt4_Fpz_nid_postfix {};
+long _ZNSt6locale2id7_Id_cntE_nid_postfix = 0;
 
+const std::locale* _ZSt21_sceLibcClassicLocale_nid_postfix = &ClassicLocaleInstance();
+
+void _ZNSt6locale5_InitEv_nid_postfix() {
+    std::lock_guard<std::mutex> lock(g_localeInitMutex);
+    if (!g_localeInitialized) {
+        ClassicLocaleInstance();
+        g_localeInitialized = true;
+    }
 }
 
-namespace {
-
-    const std::locale& ClassicLocaleInstance() {
-        static const std::locale instance = std::locale::classic();
-        return instance;
-    }
-
+void _ZNSt6locale5facet9_RegisterEv_nid_postfix() {
 }
 
-extern "C" {
+const std::locale* _ZNSt6locale16_GetgloballocaleEv_nid_postfix() {
+    return &ClassicLocaleInstance();
+}
 
-    const std::locale* _ZSt21_sceLibcClassicLocale_nid_postfix = &ClassicLocaleInstance();
+void _ZNSt7collateIwE7_GetcatEPPKNSt6locale5facetEPKS1__nid_postfix(
+    const std::locale::facet** targetFacet, const std::locale* sourceLocale
+) {
+    const std::locale& effectiveLocale = sourceLocale != nullptr ? *sourceLocale : ClassicLocaleInstance();
+    *targetFacet = &std::use_facet<std::collate<wchar_t>>(effectiveLocale);
+}
 
-    void _ZNSt6locale5_InitEv_nid_postfix() {
-        std::lock_guard<std::mutex> lock(g_localeInitMutex);
-        if (!g_localeInitialized) {
-            ClassicLocaleInstance();
-            g_localeInitialized = true;
-        }
+void _ZNSt8_LocinfoC1EPKc_nid_postfix(LocinfoStorage* self, const char* localeName) {
+    (void)localeName;
+    new (self) LocinfoStorage {};
+}
+
+void _ZNSt8_LocinfoD1Ev_nid_postfix(LocinfoStorage* self) {
+    (void)self;
+}
+
+wchar_t* _Mbtowcx_nid_postfix(wchar_t* dst, const char* src, std::size_t count, mbstate_t* st) {
+    while (count > 0) {
+        std::size_t result = std::mbrtowc(dst, src, count, st);
+        if (result == static_cast<std::size_t>(-1) || result == static_cast<std::size_t>(-2))
+            return nullptr;
+        if (result == 0)
+            return dst;
+        src += result;
+        count -= result;
+        ++dst;
     }
+    return dst;
+}
 
-    void _ZNSt6locale5facet9_RegisterEv_nid_postfix() {
-    }
+char* _Wctombx_nid_postfix(char* dst, wchar_t src, mbstate_t* st) {
+    std::size_t result = std::wcrtomb(dst, src, st);
+    if (result == static_cast<std::size_t>(-1))
+        return nullptr;
+    return dst + result;
+}
 
-    const std::locale* _ZNSt6locale16_GetgloballocaleEv_nid_postfix() {
-        return &ClassicLocaleInstance();
-    }
+const short* _Getpctype_nid_postfix() {
+    const auto& facet = std::use_facet<std::ctype<char>>(ClassicLocaleInstance());
+    return reinterpret_cast<const short*>(facet.table());
+}
 
-    void _ZNSt7collateIwE7_GetcatEPPKNSt6locale5facetEPKS1__nid_postfix(
-        const std::locale::facet** targetFacet, const std::locale* sourceLocale
-    ) {
-        const std::locale& effectiveLocale = sourceLocale != nullptr ? *sourceLocale : ClassicLocaleInstance();
-        *targetFacet = &std::use_facet<std::collate<wchar_t>>(effectiveLocale);
-    }
+const short* _Getptolower_nid_postfix() {
+    static short table[std::ctype<char>::table_size];
+    static std::once_flag flag;
+    std::call_once(flag, []() {
+        const auto& facet = std::use_facet<std::ctype<char>>(ClassicLocaleInstance());
+        for (int i = 0; i < std::ctype<char>::table_size; ++i)
+            table[i] = static_cast<short>(facet.tolower(static_cast<char>(i)));
+    });
+    return table;
+}
 
-    void _ZNSt8_LocinfoC1EPKc_nid_postfix(LocinfoStorage* self, const char* localeName) {
-        (void)localeName;
-        new (self) LocinfoStorage {};
-    }
+const short* _Getptoupper_nid_postfix() {
+    static short table[std::ctype<char>::table_size];
+    static std::once_flag flag;
+    std::call_once(flag, []() {
+        const auto& facet = std::use_facet<std::ctype<char>>(ClassicLocaleInstance());
+        for (int i = 0; i < std::ctype<char>::table_size; ++i)
+            table[i] = static_cast<short>(facet.toupper(static_cast<char>(i)));
+    });
+    return table;
+}
 
-    void _ZNSt8_LocinfoD1Ev_nid_postfix(LocinfoStorage* self) {
-        (void)self;
-    }
+mbstate_t* _Getpmbstate_nid_postfix() {
+    thread_local mbstate_t state {};
+    return &state;
+}
+
+mbstate_t* _Getpwcstate_nid_postfix() {
+    thread_local mbstate_t state {};
+    return &state;
+}
+
+wint_t _Towctrans_nid_postfix(wint_t c, wctrans_t desc) {
+    return std::towctrans(c, desc);
+}
+
+void _init_env_nid_postfix() {
+}
 
 }