func: void col_append_fstr(column_info *cinfo,const gint el,const gchar *format,... ) int i ; int len ; if ( ! ( ( ( cinfo ? cinfo -> writable : 0 ) ) && cinfo -> col_first [ el ] >= 0 ) )  for (i = cinfo -> col_first[el]; i <= cinfo -> col_last[el]; i++) if ( cinfo -> fmt_matx [ i ] [ el ] )  if ( cinfo -> col_data [ i ] != cinfo -> col_buf [ i ] )  cinfo -> col_data [ i ] = cinfo -> col_buf [ i ]; len = ( ( int ) ( strlen ( cinfo -> col_buf [ i ] ) ) ); g_vsnprintf ( & cinfo -> col_buf [ i ] [ len ] , ( max_len - len ) , format , ap ); 