common: sanitize message writer console output

(cherry picked from commit 52b33f4fb01bd54d936a016cbc63a4850daa3441)

external/easylogging++/easylogging++.cc

@@ -16,6 +16,7 @@
 
 #define EASYLOGGING_CC
 #include "easylogging++.h"
+#include <cstdint>
 
 #include <atomic>
 #include <unistd.h>
@@ -2502,11 +2503,11 @@ void DefaultLogDispatchCallback::handle(const LogDispatchData* data) {
 
 
 template<typename Transform>
-static inline void utf8canonical(std::string &s, Transform t = [](wint_t c)->wint_t { return c; })
+static inline void utf8canonical(std::string &s, Transform t = [](std::uint32_t c)->std::uint32_t { return c; })
 {
     size_t avail = s.size();
     const char *ptr = s.data();
-    wint_t cp = 0;
+    std::uint32_t cp = 0;
     int rbytes = 1, bytes = -1;
     char wbuf[8], *wptr;
     size_t w_offset = 0;
@@ -2585,7 +2586,7 @@ static inline void utf8canonical(std::string &s, Transform t = [](wint_t c)->win
 
 void sanitize(std::string &s)
 {
-  utf8canonical(s, [](wint_t c)->wint_t {
+  utf8canonical(s, [](std::uint32_t c)->std::uint32_t {
     if (c == 9 || c == 10 || c == 13)
       return c;
     if (c < 0x20)

external/easylogging++/easylogging++.h

@@ -2791,6 +2791,7 @@ class Storage : base::NoCopy, public base::threading::ThreadSafe {
   }
 };
 extern ELPP_EXPORT base::type::StoragePointer elStorage;
+ELPP_EXPORT void sanitize(std::string& s);
 #define ELPP el::base::Storage::getELPP()
 class DefaultLogDispatchCallback : public LogDispatchCallback {
  protected:

src/common/scoped_message_writer.h

@@ -99,17 +99,20 @@ public:
     {
       m_flush = false;
 
-      MCLOG_FILE(m_log_level, "msgwriter", m_oss.str());
+      std::string message = m_oss.str();
+      MCLOG_FILE(m_log_level, "msgwriter", message);
+      try { el::base::sanitize(message); }
+      catch (const std::exception&) { message = "<Invalid UTF-8 in message>"; }
 
       PAUSE_READLINE();
       if (epee::console_color_default == m_color)
       {
-        std::cout << m_oss.str();
+        std::cout << message;
       }
       else
       {
         set_console_color(m_color, m_bright);
-        std::cout << m_oss.str();
+        std::cout << message;
         epee::reset_console_color();
       }
       std::cout << std::endl;