void add (char[] prefix, char[] name, bool isDir)
                { 
                        char[512] tmp;

                        int len = prefix.length + name.length;
                        assert (len < tmp.length);
                        ++total_;

                        // construct full pathname
                        tmp[0..prefix.length] = prefix;
                        tmp[prefix.length..len] = name;
                        
                        auto p = new FileProxy (tmp[0 .. len], isDir);

                        // test this entry for inclusion
                        if (filter (p, isDir))
                           {
			   printf(" prefix length: %d\n",prefix.length );
			   printf( "prefix: %*.s\n",prefix );
			   printf( "suffix: %s\n",p.suffix.ptr );
                           // skip dirs composed only of '.'
                           char[] suffix = p.suffix;
                           if (p.name.length > 0 || suffix.length > 3 ||
                              (suffix != "..."[0 .. suffix.length]))
                               proxies ~= p;                                                   
                           }
                        else
                           delete p;
                }