+int mt_snprintf(char *buf, const size_t buf_size, const char *fmt, ...)
+{
+ // https://msdn.microsoft.com/en-us/library/bt7tawza.aspx
+ // Many of the MSVC / Windows printf-style functions do not support positional
+ // arguments (eg. "%1$s"). We just forward the call to vsnprintf for sane
+ // platforms, but defer to _vsprintf_p on MSVC / Windows.
+ // https://github.com/FFmpeg/FFmpeg/blob/5ae9fa13f5ac640bec113120d540f70971aa635d/compat/msvcrt/snprintf.c#L46
+ // _vsprintf_p has to be shimmed with _vscprintf_p on -1 (for an example see
+ // above FFmpeg link).
+ va_list args;
+ va_start(args, fmt);
+#ifndef _MSC_VER
+ int c = vsnprintf(buf, buf_size, fmt, args);
+#else // _MSC_VER
+ int c = _vsprintf_p(buf, buf_size, fmt, args);
+ if (c == -1)
+ c = _vscprintf_p(fmt, args);
+#endif // _MSC_VER
+ va_end(args);
+ return c;
+}
+
+// Load performance counter frequency only once at startup
+#ifdef _WIN32