rar: import unrarsrc-5.5.8 for reference

this will allow us to diff against newer version of unrarsrc if we wish to update our port

reference/unrar/log.cpp

@@ -0,0 +1,37 @@
+#include "rar.hpp"
+
+
+static wchar LogName[NM];
+static RAR_CHARSET LogCharset=RCH_DEFAULT;
+
+void InitLogOptions(const wchar *LogFileName,RAR_CHARSET CSet)
+{
+  wcsncpyz(LogName,LogFileName,ASIZE(LogName));
+  LogCharset=CSet;
+}
+
+
+#ifndef SILENT
+void Log(const wchar *ArcName,const wchar *fmt,...)
+{
+  // Preserve the error code for possible following system error message.
+  int Code=ErrHandler.GetSystemErrorCode();
+
+  uiAlarm(UIALARM_ERROR);
+
+  // This buffer is for format string only, not for entire output,
+  // so it can be short enough.
+  wchar fmtw[1024];
+  PrintfPrepareFmt(fmt,fmtw,ASIZE(fmtw));
+
+  safebuf wchar Msg[2*NM+1024];
+  va_list arglist;
+  va_start(arglist,fmt);
+  vswprintf(Msg,ASIZE(Msg),fmtw,arglist);
+  va_end(arglist);
+  eprintf(L"%ls",Msg);
+  ErrHandler.SetSystemErrorCode(Code);
+}
+#endif
+
+