Add VS trace function

VS OutputDebugString doesn't support %hh* %ll*, so let vsnprint handle it then write a simple string to debug console.
The purpose of this is that its faster than writing logs to a file. (Only when debugging with VS tho).

This can be enabled by defining preprocessor: VS_TRACE_DEBUG

dll/base.cpp

@@ -18,6 +18,42 @@
 #include "base.h"
 
 #ifdef STEAM_WIN32
+
+#ifndef EMU_RELEASE_BUILD
+#ifdef VS_TRACE_DEBUG
+#include <cstdio>
+
+// Visual Studio doesn't seem to support hh* or ll* in OutputDebugString
+// So process it before sending it to debug console
+bool _trace(const char* format, ...)
+{
+    constexpr const int len = 1024; // Initial buffer size, hope it is big enought, we will exapnd it if not.
+    int res;
+    char *buffer = new char[len];
+
+    va_list argptr;
+    va_start(argptr, format);
+    res = vsnprintf(buffer, len, format, argptr);
+    va_end(argptr);
+    if (res >= len)
+    {
+        delete[]buffer;
+        // Now we are sure we have enought free space to contain the string
+        buffer = new char[++res];
+        va_start(argptr, format);
+        vsnprintf(buffer, res, format, argptr);
+        va_end(argptr);
+    }
+
+    OutputDebugString(buffer);
+    delete[]buffer;
+
+    return true;
+}
+#endif // VS_TRACE_DEBUG
+#endif // EMU_RELEASE_BUILD
+
+
 #include <windows.h>
 #include <direct.h>
 

dll/base.h

@@ -44,7 +44,12 @@
 EXTERN_C IMAGE_DOS_HEADER __ImageBase;
 #define PATH_SEPARATOR "\\"
 #ifndef EMU_RELEASE_BUILD
+#ifdef VS_TRACE_DEBUG
+bool _trace(const char* format, ...);
+#define PRINT_DEBUG(FMT, ...) _trace(FMT, ##__VA_ARGS__)
+#else // VS_TRACE_DEBUG
 #define PRINT_DEBUG(a, ...) do {FILE *t = fopen("STEAM_LOG.txt", "a"); fprintf(t, "%u " a, GetCurrentThreadId(), __VA_ARGS__); fclose(t); WSASetLastError(0);} while (0)
+#endif // VS_TRACE_DEBUG
 #endif
 #else
 #include <arpa/inet.h>