vsnprintf implementation

src/Core/PS4/HLE/LibC.cpp

@@ -107,6 +107,7 @@ void PS4_SYSV_ABI qsort(void* ptr, size_t count,size_t size, int(PS4_SYSV_ABI* c
     std::qsort(ptr, count, size, qsort_compair);
 }
 
+
 void LibC_Register(SymbolsResolver* sym) {
     LIB_FUNCTION("bzQExy189ZI", "libc", 1, "libc", 1, 1, init_env);
     LIB_FUNCTION("3GPpjQdAMTw", "libc", 1, "libc", 1, 1, __cxa_guard_acquire);
@@ -119,6 +120,7 @@ void LibC_Register(SymbolsResolver* sym) {
     LIB_FUNCTION("8G2LB+A3rzg", "libc", 1, "libc", 1, 1, Emulator::HLE::Libraries::LibC::atexit);
     LIB_FUNCTION("-QgqOT5u2Vk", "libc", 1, "libc", 1, 1, _Assert);
     LIB_FUNCTION("hcuQgD53UxM", "libc", 1, "libc", 1, 1, Emulator::HLE::Libraries::LibC::printf);
+    LIB_FUNCTION("Q2V+iqvjgC0", "libc", 1, "libc", 1, 1, Emulator::HLE::Libraries::LibC::vsnprintf);
     LIB_FUNCTION("YQ0navp+YIc", "libc", 1, "libc", 1, 1, puts);
     LIB_FUNCTION("cpCOXWMgha0", "libc", 1, "libc", 1, 1, rand);
     LIB_FUNCTION("ZtjspkJQ+vw", "libc", 1, "libc", 1, 1, _Fsin);

src/Emulator/HLE/Libraries/LibC/libc.cpp

@@ -12,6 +12,8 @@ PS4_SYSV_ABI int printf(VA_ARGS) {
     return printf_ctx(&ctx);
 }
 
+int PS4_SYSV_ABI vsnprintf(char* s, size_t n, const char* format, VaList* arg) { return vsnprintf_ctx(s, n, format, arg); }
+
 PS4_SYSV_ABI void exit(int code) { std::exit(code); }
 
 PS4_SYSV_ABI int atexit(void (*func)()) {

src/Emulator/HLE/Libraries/LibC/libc.h

@@ -8,6 +8,7 @@ namespace Emulator::HLE::Libraries::LibC {
 
 // HLE functions
 PS4_SYSV_ABI int printf(VA_ARGS);
+int PS4_SYSV_ABI vsnprintf(char* s, size_t n, const char* format, VaList* arg);
 PS4_SYSV_ABI void exit(int code);
 PS4_SYSV_ABI int atexit(void (*func)());
 int PS4_SYSV_ABI memcmp(const void* s1, const void* s2, size_t n);

src/Emulator/HLE/Libraries/LibC/printf.h

@@ -56,7 +56,7 @@
 #include <cstdbool>
 #include <cstddef>
 #include <cstdint>
-
+#include <string>
 #include "va_ctx.h"
 
 namespace Emulator::HLE::Libraries::LibC {
@@ -693,4 +693,10 @@ static int printf_ctx(VaCtx* ctx) {
     return result;
 }
 
+static int vsnprintf_ctx(char* s, size_t n, const char* format, VaList* arg) { 
+    char buffer[n]; 
+    int result = _vsnprintf(_out_buffer, buffer, format, arg);
+    std::strcpy(s, buffer);
+    return result;
+}
 }  // namespace Emulator::HLE::Libraries::LibC