Function check_valid_path

sql/sql_plugin.cc:370–374

Check if the provided path is valid in the sense that it does cause a relative reference outside the directory. @note Currently, this function only check if there are any characters in FN_DIRSEP in the string, but it might change in the future. @code check_valid_path("../foo.so") -> true check_valid_path("foo.so") -> false @endcode */

   @endcode
 */
bool check_valid_path(const char *path, size_t len)
{
  size_t prefix= my_strcspn(files_charset_info, path, path + len, FN_DIRSEP);
  return  prefix < len;
}

static void fix_dl_name(MEM_ROOT *root, LEX_CSTRING *dl)
{