57 derwin(WINDOW *orig, int num_lines, int nc, int by, int bx)  in derwin()  argument
67 	if (by < 0 || (by + num_lines) > orig->_maxy || bx < 0 ||  in derwin()
68 	    (bx + nc) > orig->_maxx)  in derwin()
71 		nc = orig->_maxx - bx;  in derwin()
73 		num_lines = orig->_maxy - by;  in derwin()
76 	if ((win = _makenew(num_lines, nc, by + orig->_begy,  in derwin()
77 	    bx + orig->_begx)) == NULL)  in derwin()
85 	win->_bkgd = orig->_bkgd;  in derwin()
86 	win->_attrs = orig->_attrs;  in derwin()
88 	o_y = orig->_y;  in derwin()
95 		o_y16 = orig->_y16;  in derwin()
105 	win->_yoffset = orig->_yoffset;  in derwin()
108 	win->_parent = orig;  in derwin()