Remove c_format as redundant

src/xinterpreter.cpp

@@ -339,29 +339,6 @@ __get_cxx_version ()
         restore_output();
     }
 
-    static std::string c_format(const char* format, std::va_list args)
-    {
-        // Call vsnprintf once to determine the required buffer length. The
-        // return value is the number of characters _excluding_ the null byte.
-        std::va_list args_bufsz;
-        va_copy(args_bufsz, args);
-        std::size_t bufsz = vsnprintf(NULL, 0, format, args_bufsz);
-        va_end(args_bufsz);
-
-        // Create an empty string of that size.
-        std::string s(bufsz, 0);
-
-        // Now format the data into this string and return it.
-        std::va_list args_format;
-        va_copy(args_format, args);
-        // The second parameter is the maximum number of bytes that vsnprintf
-        // will write _including_ the  terminating null byte.
-        vsnprintf(&s[0], s.size() + 1, format, args_format);
-        va_end(args_format);
-
-        return s;
-    }
-
     void interpreter::redirect_output()
     {
         p_cout_strbuf = std::cout.rdbuf();