1424 	    int     jumpidx;  in do_buffer_ext()  local
1426 	    jumpidx = curwin->w_jumplistidx - 1;  in do_buffer_ext()
1427 	    if (jumpidx < 0)  in do_buffer_ext()
1428 		jumpidx = curwin->w_jumplistlen - 1;  in do_buffer_ext()
1430 	    forward = jumpidx;  in do_buffer_ext()
1431 	    while (jumpidx != curwin->w_jumplistidx)  in do_buffer_ext()
1433 		buf = buflist_findnr(curwin->w_jumplist[jumpidx].fmark.fnum);  in do_buffer_ext()
1449 		if (!jumpidx && curwin->w_jumplistidx == curwin->w_jumplistlen)  in do_buffer_ext()
1451 		if (--jumpidx < 0)  in do_buffer_ext()
1452 		    jumpidx = curwin->w_jumplistlen - 1;  in do_buffer_ext()
1453 		if (jumpidx == forward)		// List exhausted for sure  in do_buffer_ext()