diff --git a/core/libs/prx/libSceLibcInternal/Export.cpp b/core/libs/prx/libSceLibcInternal/Export.cpp
index 6597f5f5b..49699b6ca 100644
--- a/core/libs/prx/libSceLibcInternal/Export.cpp
+++ b/core/libs/prx/libSceLibcInternal/Export.cpp
@@ -1,7 +1,14 @@
+#include "prx/libc/include/General.hpp"
 #include "prx/libc/include/HeapDiagnostics.hpp"
 
 extern "C" {
 
+int Need_sceLibcInternal_nid_postfix = 1;
+
+void APS5_VABI __cxa_finalize_nid_postfix(void* dsoHandle) {
+    CxaFinalize_nid_no_patch(dsoHandle);
+}
+
 void APS5_VABI sceLibcHeapGetTraceInfo_nid_postfix(Info* info) {
     LibcHeapTraceInfo_nid_no_patch(info);
 }
diff --git a/core/libs/prx/libc/include/General.hpp b/core/libs/prx/libc/include/General.hpp
index f1ed6ca20..35c9126a5 100644
--- a/core/libs/prx/libc/include/General.hpp
+++ b/core/libs/prx/libc/include/General.hpp
@@ -9,6 +9,7 @@
 #include "general/ExportMacros.hpp"
 
 extern "C" void NotImplemented_nid_no_patch(const char* funcName);
+extern "C" void CxaFinalize_nid_no_patch(void* dsoHandle);
 
 extern "C" std::filesystem::path ResolvePath_nid_no_patch(const char* path);
 // Guest path aliases: a guest prefix such as "/_sm/0" (a save-data mount point) resolves to a host
diff --git a/core/libs/prx/libc/include/specifics/gcc/AtomicOps.hpp b/core/libs/prx/libc/include/specifics/gcc/AtomicOps.hpp
index 37a0e544c..bfeef359d 100644
--- a/core/libs/prx/libc/include/specifics/gcc/AtomicOps.hpp
+++ b/core/libs/prx/libc/include/specifics/gcc/AtomicOps.hpp
@@ -9,4 +9,12 @@ inline unsigned int GccAtomicFetchSub(volatile unsigned int* target, unsigned in
     return __atomic_fetch_sub(target, value, __ATOMIC_SEQ_CST);
 }
 
+inline bool GccAtomicCompareExchangeWeak(volatile unsigned int* target, unsigned int* expected, unsigned int desired) {
+    return __atomic_compare_exchange_n(target, expected, desired, true, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
+}
+
+inline unsigned int GccAtomicLoad(volatile unsigned int* target) {
+    return __atomic_load_n(target, __ATOMIC_SEQ_CST);
+}
+
 #endif
diff --git a/core/libs/prx/libc/src/FileAndHeap.cpp b/core/libs/prx/libc/src/FileAndHeap.cpp
index b3e3ed183..be4ac1c83 100644
--- a/core/libs/prx/libc/src/FileAndHeap.cpp
+++ b/core/libs/prx/libc/src/FileAndHeap.cpp
@@ -63,6 +63,14 @@ FileStream* APS5_VABI fopen_nid_postfix(const char* filename, const char* mode)
     return stream.release();
 }
 
+int APS5_VABI fopen_s_nid_postfix(FileStream** result, const char* filename, const char* mode) {
+    constexpr int GuestEinval = 22;
+    constexpr int GuestEnoent = 2;
+    if (!result || !filename || !mode) return GuestEinval;
+    *result = fopen_nid_postfix(filename, mode);
+    return *result ? 0 : GuestEnoent;
+}
+
 int APS5_VABI fclose_nid_postfix(FileStream* stream) {
     GetNativeStream(stream);
     std::unique_ptr<FileStream> owner(stream->IsDynamic() ? stream : nullptr);
@@ -121,6 +129,17 @@ int APS5_VABI fseek_nid_postfix(FileStream* stream, std::int64_t offset, int ori
 
 std::int64_t APS5_VABI ftell_nid_postfix(FileStream* stream) { return ftello_nid_postfix(stream); }
 
+int APS5_VABI fgetpos_nid_postfix(FileStream* stream, std::int64_t* position) {
+    if (!position) throw std::invalid_argument("fgetpos: null position");
+    *position = ftello_nid_postfix(stream);
+    return 0;
+}
+
+int APS5_VABI fsetpos_nid_postfix(FileStream* stream, const std::int64_t* position) {
+    if (!position) throw std::invalid_argument("fsetpos: null position");
+    return fseeko_nid_postfix(stream, *position, SEEK_SET);
+}
+
 int APS5_VABI fputs_nid_postfix(const char* str, FileStream* stream) {
     if (!str) throw std::runtime_error("fputs: null string");
     const int result = std::fputs(str, GetNativeStream(stream));
@@ -149,6 +168,15 @@ void* APS5_VABI memalign_nid_postfix(size_t alignment, size_t size) {
     return ApplicationHeapAlign_nid_no_patch(alignment, size);
 }
 
+void* APS5_VABI aligned_alloc_nid_postfix(size_t alignment, size_t size) {
+    return ApplicationHeapAlign_nid_no_patch(alignment, size);
+}
+
+void* APS5_VABI reallocalign_nid_postfix(void* ptr, size_t size, size_t alignment) {
+    if (ptr != nullptr) NotImplemented_nid_no_patch("reallocalign of an existing block");
+    return ApplicationHeapAlign_nid_no_patch(alignment, size);
+}
+
 void* APS5_VABI calloc_nid_postfix(size_t count, size_t size) {
     return ApplicationHeapCalloc_nid_no_patch(count, size);
 }
diff --git a/core/libs/prx/libc/src/Formatting.cpp b/core/libs/prx/libc/src/Formatting.cpp
index 207069071..bac3baaf8 100644
--- a/core/libs/prx/libc/src/Formatting.cpp
+++ b/core/libs/prx/libc/src/Formatting.cpp
@@ -169,6 +169,56 @@ int APS5_VABI vsnprintf_nid_postfix(char* str, size_t size, const char* format,
 #endif
 }
 
+#ifdef _WIN32
+
+int APS5_VABI snprintf_s_nid_postfix(char* buffer, size_t size, const char* format, ...) {
+    __builtin_sysv_va_list args;
+    __builtin_sysv_va_start(args, format);
+    const int result = LibcDetail::FormatWindows(buffer, size, format, args);
+    __builtin_sysv_va_end(args);
+    return result;
+}
+
+int APS5_VABI printf_s_nid_postfix(const char* format, ...) {
+    __builtin_sysv_va_list args;
+    __builtin_sysv_va_start(args, format);
+    const int result = LibcDetail::PrintWindows(format, args);
+    __builtin_sysv_va_end(args);
+    return result;
+}
+
+#else
+
+int APS5_VABI vsprintf_s_nid_postfix(char* buffer, size_t size, const char* format, VaList* args) {
+    return std::vsnprintf(buffer, size, format, *reinterpret_cast<std::va_list*>(args));
+}
+
+int APS5_VABI sprintf_s_nid_postfix(char* buffer, size_t size, const char* format, ...) {
+    std::va_list args;
+    va_start(args, format);
+    const int result = std::vsnprintf(buffer, size, format, args);
+    va_end(args);
+    return result;
+}
+
+int APS5_VABI snprintf_s_nid_postfix(char* buffer, size_t size, const char* format, ...) {
+    std::va_list args;
+    va_start(args, format);
+    const int result = std::vsnprintf(buffer, size, format, args);
+    va_end(args);
+    return result;
+}
+
+int APS5_VABI printf_s_nid_postfix(const char* format, ...) {
+    std::va_list args;
+    va_start(args, format);
+    const int result = std::vprintf(format, args);
+    va_end(args);
+    return result;
+}
+
+#endif
+
 int APS5_VABI puts_nid_postfix(const char* s) {
     return std::puts(s);
 }
diff --git a/core/libs/prx/libc/src/LocaleSupport.cpp b/core/libs/prx/libc/src/LocaleSupport.cpp
index 4c52e8ad2..4bc5eb94e 100644
--- a/core/libs/prx/libc/src/LocaleSupport.cpp
+++ b/core/libs/prx/libc/src/LocaleSupport.cpp
@@ -143,6 +143,9 @@ int APS5_VABI tolower_nid_postfix(int c) { return ConvertCharacter(c, false); }
 std::uint64_t _ZNSt5ctypeIcE2idE_nid_postfix = 0;
 std::uint64_t _ZNSt5ctypeIwE2idE_nid_postfix = 0;
 std::uint64_t _ZNSt7collateIwE2idE_nid_postfix = 0;
+std::uint64_t _ZNSt7collateIcE2idE_nid_postfix = 0;
+std::uint64_t _ZNSt7codecvtIcc9_MbstatetE2idE_nid_postfix = 0;
+std::uintptr_t _ZTVSt7codecvtIcc9_MbstatetE_nid_postfix[16] {};
 std::uint64_t _ZNSt7num_putIcSt19ostreambuf_iteratorIcSt11char_traitsIcEEE2idE_nid_postfix = 0;
 std::uintptr_t _ZTVSt7num_putIcSt19ostreambuf_iteratorIcSt11char_traitsIcEEE_nid_postfix[12] {};
 
@@ -185,6 +188,10 @@ void APS5_VABI _ZNSt7collateIwE7_GetcatEPPKNSt6locale5facetEPKS1__nid_postfix(Gu
     NotImplemented_nid_no_patch(__func__);
 }
 
+void APS5_VABI _ZNSt7collateIcE7_GetcatEPPKNSt6locale5facetEPKS1__nid_postfix(GuestLocale::Facet**, const GuestLocale::Implementation*) {
+    NotImplemented_nid_no_patch(__func__);
+}
+
 void APS5_VABI _ZNSt8_LocinfoC1EPKc_nid_postfix(GuestLocale::LocinfoStorage* self, const char* localeName) {
     if (self == nullptr || localeName == nullptr || std::strcmp(localeName, "C") != 0) throw std::invalid_argument("_Locinfo: only the C locale is supported");
     new (self) GuestLocale::LocinfoStorage{};
diff --git a/core/libs/prx/libc/src/RuntimeSupport.cpp b/core/libs/prx/libc/src/RuntimeSupport.cpp
index c2772ac47..bf1ada3eb 100644
--- a/core/libs/prx/libc/src/RuntimeSupport.cpp
+++ b/core/libs/prx/libc/src/RuntimeSupport.cpp
@@ -1,4 +1,6 @@
+#include <algorithm>
 #include <cstdio>
+#include <iterator>
 #include <cstdlib>
 #include <stdexcept>
 #include <functional>
@@ -6,6 +8,9 @@
 #include <mutex>
 #include <vector>
 #include <utility>
+#include <random>
+#include <string>
+#include <cinttypes>
 
 #include "prx/libc/include/General.hpp"
 #include "prx/libc/include/specifics/gcc/AtomicOps.hpp"
@@ -15,6 +20,16 @@ namespace {
 
 std::recursive_mutex g_sysLock;
 
+struct ExitDestructor {
+    void (*func)(void*);
+    void* arg;
+    void* dsoHandle;
+};
+
+std::mutex g_exitMutex;
+std::vector<ExitDestructor> g_exitDestructors;
+bool g_exitRunnerRegistered = false;
+
 }
 
 extern "C" {
@@ -24,21 +39,31 @@ FileStream _Stdout_nid_postfix{stdout};
 FileStream _Stdin_nid_postfix{stdin};
 
 int APS5_VABI __cxa_atexit_nid_postfix(void (*func)(void*), void* arg, void* dsoHandle) {
-    (void)dsoHandle;
-    static std::vector<std::pair<void (*)(void*), void*>> destructors;
-    static bool runnerRegistered = false;
-    destructors.emplace_back(func, arg);
-    if (!runnerRegistered) {
-        runnerRegistered = true;
-        std::atexit([] {
-            for (auto it = destructors.rbegin(); it != destructors.rend(); ++it) {
-                it->first(it->second);
-            }
-        });
+    std::lock_guard lock(g_exitMutex);
+    g_exitDestructors.push_back({func, arg, dsoHandle});
+    if (!g_exitRunnerRegistered) {
+        g_exitRunnerRegistered = true;
+        std::atexit([] { CxaFinalize_nid_no_patch(nullptr); });
     }
     return 0;
 }
 
+void CxaFinalize_nid_no_patch(void* dsoHandle) {
+    for (;;) {
+        ExitDestructor destructor{};
+        {
+            std::lock_guard lock(g_exitMutex);
+            const auto found = std::find_if(g_exitDestructors.rbegin(), g_exitDestructors.rend(), [&](const ExitDestructor& entry) {
+                return dsoHandle == nullptr || entry.dsoHandle == dsoHandle;
+            });
+            if (found == g_exitDestructors.rend()) return;
+            destructor = *found;
+            g_exitDestructors.erase(std::next(found).base());
+        }
+        destructor.func(destructor.arg);
+    }
+}
+
 unsigned int APS5_VABI _Atomic_fetch_add_4_nid_postfix(volatile unsigned int* target, unsigned int value, int memoryOrder) {
     (void)memoryOrder;
     return GccAtomicFetchAdd(target, value);
@@ -49,6 +74,50 @@ unsigned int APS5_VABI _Atomic_fetch_sub_4_nid_postfix(volatile unsigned int* ta
     return GccAtomicFetchSub(target, value);
 }
 
+int APS5_VABI _Atomic_compare_exchange_weak_4_nid_postfix(volatile unsigned int* target, unsigned int* expected, unsigned int desired, int successOrder, int failureOrder) {
+    (void)successOrder;
+    (void)failureOrder;
+    return GccAtomicCompareExchangeWeak(target, expected, desired) ? 1 : 0;
+}
+
+unsigned int APS5_VABI _Atomic_load_4_nid_postfix(volatile unsigned int* target, int memoryOrder) {
+    (void)memoryOrder;
+    return GccAtomicLoad(target);
+}
+
+std::uintmax_t APS5_VABI strtoumax_nid_postfix(const char* str, char** endptr, int base) {
+    return std::strtoumax(str, endptr, base);
+}
+
+unsigned int APS5_VABI _ZSt14_Random_devicev_nid_postfix() {
+    static std::random_device device;
+    static std::mutex mutex;
+    std::lock_guard lock(mutex);
+    return device();
+}
+
+[[noreturn]] void APS5_VABI _ZSt14_Throw_C_errori_nid_postfix(int code) {
+    throw std::runtime_error("_Throw_C_error: C11 thread error " + std::to_string(code));
+}
+
+void APS5_VABI _Lockfilelock_nid_postfix(FileStream* stream) {
+    if (stream == nullptr) throw std::invalid_argument("_Lockfilelock: null stream");
+#ifdef _WIN32
+    _lock_file(GetNativeStream(stream));
+#else
+    flockfile(GetNativeStream(stream));
+#endif
+}
+
+void APS5_VABI _Unlockfilelock_nid_postfix(FileStream* stream) {
+    if (stream == nullptr) throw std::invalid_argument("_Unlockfilelock: null stream");
+#ifdef _WIN32
+    _unlock_file(GetNativeStream(stream));
+#else
+    funlockfile(GetNativeStream(stream));
+#endif
+}
+
 unsigned long APS5_VABI _Stoul_nid_postfix(const char* str, char** endptr, int base) {
     return std::strtoul(str, endptr, base);
 }
diff --git a/core/libs/prx/libc/src/StdioExtras.cpp b/core/libs/prx/libc/src/StdioExtras.cpp
index 90a21b057..d2aabc81d 100644
--- a/core/libs/prx/libc/src/StdioExtras.cpp
+++ b/core/libs/prx/libc/src/StdioExtras.cpp
@@ -6,6 +6,7 @@
 
 #include "prx/libc/include/FileStream.hpp"
 #include "prx/libc/include/GuestHeap.hpp"
+#include "prx/libc/include/ApplicationHeap.hpp"
 #include "prx/libc/include/General.hpp"
 #include "SceTypes.hpp"
 
@@ -19,6 +20,10 @@ using GuestNewHandler = void (APS5_VABI*)();
 
 GuestNewHandler g_newHandler = nullptr;
 
+void* Allocate(std::size_t size) {
+    return ApplicationHeapAllocate_nid_no_patch(size == 0 ? 1 : size);
+}
+
 }
 
 extern "C" {
@@ -58,6 +63,44 @@ GuestNewHandler APS5_VABI _ZSt15set_new_handlerPFvvE_nid_postfix(GuestNewHandler
     return previous;
 }
 
+GuestNewHandler APS5_VABI _ZSt15get_new_handlerv_nid_postfix() {
+    return g_newHandler;
+}
+
+unsigned char _ZSt7nothrow_nid_postfix = 0;
+
+void* APS5_VABI _Znwm_nid_postfix(std::size_t size) {
+    return Allocate(size);
+}
+
+void* APS5_VABI _Znam_nid_postfix(std::size_t size) {
+    return Allocate(size);
+}
+
+void* APS5_VABI _ZnwmRKSt9nothrow_t_nid_postfix(std::size_t size, const void*) {
+    return Allocate(size);
+}
+
+void* APS5_VABI _ZnamRKSt9nothrow_t_nid_postfix(std::size_t size, const void*) {
+    return Allocate(size);
+}
+
+void APS5_VABI _ZdlPv_nid_postfix(void* pointer) {
+    if (pointer != nullptr) ApplicationHeapFree_nid_no_patch(pointer);
+}
+
+void APS5_VABI _ZdaPv_nid_postfix(void* pointer) {
+    if (pointer != nullptr) ApplicationHeapFree_nid_no_patch(pointer);
+}
+
+void APS5_VABI _ZdlPvm_nid_postfix(void* pointer, std::size_t) {
+    if (pointer != nullptr) ApplicationHeapFree_nid_no_patch(pointer);
+}
+
+void APS5_VABI _ZdaPvm_nid_postfix(void* pointer, std::size_t) {
+    if (pointer != nullptr) ApplicationHeapFree_nid_no_patch(pointer);
+}
+
 void APS5_VABI _ZdlPvSt11align_val_t_nid_postfix(void* pointer, std::size_t alignment) {
     (void)alignment;
     GuestHeap::GuestHeapFree_nid_postfix(pointer);
diff --git a/core/libs/prx/libc/src/Strings.cpp b/core/libs/prx/libc/src/Strings.cpp
index c3fdec2d6..1f70ddc44 100644
--- a/core/libs/prx/libc/src/Strings.cpp
+++ b/core/libs/prx/libc/src/Strings.cpp
@@ -188,6 +188,79 @@ int APS5_VABI strncpy_s_nid_postfix(char* dest, size_t destsz, const char* src,
     return 0;
 }
 
+int APS5_VABI strcpy_s_nid_postfix(char* dest, size_t destsz, const char* src) {
+    return strncpy_s_nid_postfix(dest, destsz, src, static_cast<size_t>(-1));
+}
+
+int APS5_VABI strncat_s_nid_postfix(char* dest, size_t destsz, const char* src, size_t count) {
+    constexpr int GuestEinval = 22;
+    constexpr int GuestErange = 34;
+    if (!dest || destsz == 0) return GuestEinval;
+    size_t used = 0;
+    while (used < destsz && dest[used] != '\0') ++used;
+    if (used == destsz || !src) {
+        dest[0] = '\0';
+        return used == destsz ? GuestErange : GuestEinval;
+    }
+    size_t length = 0;
+    while (length < count && src[length] != '\0') ++length;
+    if (length >= destsz - used) {
+        dest[0] = '\0';
+        return GuestErange;
+    }
+    std::memcpy(dest + used, src, length);
+    dest[used + length] = '\0';
+    return 0;
+}
+
+int APS5_VABI strcat_s_nid_postfix(char* dest, size_t destsz, const char* src) {
+    return strncat_s_nid_postfix(dest, destsz, src, static_cast<size_t>(-1));
+}
+
+int APS5_VABI memcpy_s_nid_postfix(void* dest, size_t destsz, const void* src, size_t count) {
+    constexpr int GuestEinval = 22;
+    constexpr int GuestErange = 34;
+    if (!dest) return GuestEinval;
+    if (!src || count > destsz) {
+        std::memset(dest, 0, destsz);
+        return src ? GuestErange : GuestEinval;
+    }
+    std::memcpy(dest, src, count);
+    return 0;
+}
+
+int APS5_VABI memmove_s_nid_postfix(void* dest, size_t destsz, const void* src, size_t count) {
+    constexpr int GuestEinval = 22;
+    constexpr int GuestErange = 34;
+    if (!dest) return GuestEinval;
+    if (!src || count > destsz) {
+        std::memset(dest, 0, destsz);
+        return src ? GuestErange : GuestEinval;
+    }
+    std::memmove(dest, src, count);
+    return 0;
+}
+
+int APS5_VABI memset_s_nid_postfix(void* dest, size_t destsz, int value, size_t count) {
+    constexpr int GuestEinval = 22;
+    constexpr int GuestErange = 34;
+    if (!dest) return GuestEinval;
+    const auto length = count > destsz ? destsz : count;
+    auto* bytes = static_cast<volatile unsigned char*>(dest);
+    for (size_t index = 0; index < length; ++index) bytes[index] = static_cast<unsigned char>(value);
+    return count > destsz ? GuestErange : 0;
+}
+
+char* APS5_VABI strnstr_nid_postfix(const char* haystack, const char* needle, size_t length) {
+    const size_t needleLength = std::strlen(needle);
+    if (needleLength == 0) return const_cast<char*>(haystack);
+    for (size_t index = 0; index < length && haystack[index] != '\0'; ++index) {
+        if (needleLength > length - index) break;
+        if (std::strncmp(haystack + index, needle, needleLength) == 0) return const_cast<char*>(haystack + index);
+    }
+    return nullptr;
+}
+
 unsigned long long APS5_VABI _Stoull_nid_postfix(const char* str, char** endptr, int base) {
     return std::strtoull(str, endptr, base);
 }
diff --git a/core/libs/prx/libc/src/Time.cpp b/core/libs/prx/libc/src/Time.cpp
index 6d03d5fb1..64bc20ddb 100644
--- a/core/libs/prx/libc/src/Time.cpp
+++ b/core/libs/prx/libc/src/Time.cpp
@@ -89,6 +89,10 @@ size_t APS5_VABI libc_strftime_nid_postfix(char* str, size_t count, const char*
     return std::strftime(str, count, format, timeptr);
 }
 
+char* APS5_VABI asctime_nid_postfix(const std::tm* timeptr) {
+    return std::asctime(timeptr);
+}
+
 size_t APS5_VABI strftime_nid_postfix(char* str, size_t count, const char* format, const std::tm* timeptr) {
     return std::strftime(str, count, format, timeptr);
 }
diff --git a/core/libs/tests/ApplicationHeap.cpp b/core/libs/tests/ApplicationHeap.cpp
index 48009f88e..781827460 100644
--- a/core/libs/tests/ApplicationHeap.cpp
+++ b/core/libs/tests/ApplicationHeap.cpp
@@ -7,6 +7,13 @@
 #include <limits>
 #include <stdexcept>
 
+extern "C" {
+void* APS5_VABI _Znwm_nid_postfix(std::size_t);
+void* APS5_VABI _ZnamRKSt9nothrow_t_nid_postfix(std::size_t, const void*);
+void APS5_VABI _ZdlPv_nid_postfix(void*);
+void APS5_VABI _ZdaPv_nid_postfix(void*);
+}
+
 namespace {
 
 alignas(64) std::array<std::byte, 256> storage{};
@@ -117,7 +124,15 @@ int main(int argc, char**) {
     require(ApplicationHeapPosixAlign_nid_no_patch(&pointer, 64, 128) == 0 && pointer == storage.data() && lastAlignment == 64);
     reject([] { ApplicationHeapAlign_nid_no_patch(3, 64); });
     reject([] { ApplicationHeapCalloc_nid_no_patch(2, std::numeric_limits<std::size_t>::max()); });
+    require(_Znwm_nid_postfix(0) == storage.data() && lastSize == 1);
+    _ZdlPv_nid_postfix(storage.data());
+    _ZdlPv_nid_postfix(nullptr);
+    require(frees == 3);
+    require(_ZnamRKSt9nothrow_t_nid_postfix(24, nullptr) == storage.data() && lastSize == 24);
+    _ZdaPv_nid_postfix(storage.data());
+    require(frees == 4);
     fail = true;
+    reject([] { _Znwm_nid_postfix(8); });
     reject([] { ApplicationHeapAlign_nid_no_patch(4, 64); });
     reject([] { ApplicationHeapAllocate_nid_no_patch(64); });
     void* unchanged = storage.data();
diff --git a/core/libs/tests/GuestStrings.cpp b/core/libs/tests/GuestStrings.cpp
index cc8eefab6..c10a9f3bb 100644
--- a/core/libs/tests/GuestStrings.cpp
+++ b/core/libs/tests/GuestStrings.cpp
@@ -15,6 +15,14 @@ std::size_t APS5_VABI strlcat_nid_postfix(char*, const char*, std::size_t);
 char* APS5_VABI strtok_r_nid_postfix(char*, const char*, char**);
 char* APS5_VABI strtok_nid_postfix(char*, const char*);
 char* APS5_VABI strcasestr_nid_postfix(const char*, const char*);
+int APS5_VABI strcpy_s_nid_postfix(char*, std::size_t, const char*);
+int APS5_VABI strcat_s_nid_postfix(char*, std::size_t, const char*);
+int APS5_VABI strncat_s_nid_postfix(char*, std::size_t, const char*, std::size_t);
+int APS5_VABI memcpy_s_nid_postfix(void*, std::size_t, const void*, std::size_t);
+int APS5_VABI memmove_s_nid_postfix(void*, std::size_t, const void*, std::size_t);
+int APS5_VABI memset_s_nid_postfix(void*, std::size_t, int, std::size_t);
+char* APS5_VABI strnstr_nid_postfix(const char*, const char*, std::size_t);
+int APS5_VABI snprintf_s_nid_postfix(char*, std::size_t, const char*, ...);
 }
 
 static void Require(bool condition) {
@@ -24,7 +32,31 @@ static void Require(bool condition) {
     }
 }
 
+static void CheckBoundsCheckedFunctions() {
+    char small[4] = "zz";
+    Require(strcpy_s_nid_postfix(small, sizeof(small), "abc") == 0 && std::strcmp(small, "abc") == 0);
+    Require(strcpy_s_nid_postfix(small, sizeof(small), "abcd") == 34 && small[0] == '\0');
+    Require(strcpy_s_nid_postfix(nullptr, 4, "a") == 22);
+    char joined[8] = "ab";
+    Require(strcat_s_nid_postfix(joined, sizeof(joined), "cd") == 0 && std::strcmp(joined, "abcd") == 0);
+    Require(strncat_s_nid_postfix(joined, sizeof(joined), "efgh", 2) == 0 && std::strcmp(joined, "abcdef") == 0);
+    Require(strcat_s_nid_postfix(joined, sizeof(joined), "gh") == 34 && joined[0] == '\0');
+    char bytes[4] = {1, 2, 3, 4};
+    const char source[4] = {5, 6, 7, 8};
+    Require(memcpy_s_nid_postfix(bytes, sizeof(bytes), source, 2) == 0 && bytes[0] == 5 && bytes[2] == 3);
+    Require(memcpy_s_nid_postfix(bytes, 2, source, 4) == 34 && bytes[0] == 0 && bytes[1] == 0 && bytes[2] == 3);
+    char overlap[6] = "abcde";
+    Require(memmove_s_nid_postfix(overlap + 1, 5, overlap, 3) == 0 && std::strcmp(overlap, "aabce") == 0);
+    Require(memset_s_nid_postfix(bytes, sizeof(bytes), 9, 8) == 34 && bytes[3] == 9);
+    Require(strnstr_nid_postfix("haystack", "st", 4) == nullptr);
+    const char haystack[] = "haystack";
+    Require(strnstr_nid_postfix(haystack, "st", 6) == haystack + 3);
+    char formatted[8];
+    Require(snprintf_s_nid_postfix(formatted, sizeof(formatted), "%d-%s", 42, "x") == 4 && std::strcmp(formatted, "42-x") == 0);
+}
+
 int main() {
+    CheckBoundsCheckedFunctions();
     Require(std::strcmp(basename_nid_postfix(nullptr), ".") == 0);
     Require(std::strcmp(basename_nid_postfix(""), ".") == 0);
     Require(std::strcmp(basename_nid_postfix("////"), "/") == 0);