R_PREV
case R_PREV:
case R_PREV: /* Previous record. */
case R_PREV:
case R_PREV:
reverse_flag ? R_PREV : R_NEXT);
nflags = R_PREV;
if (!strcmp(s, "R_PREV")) return (R_PREV);
case R_PREV: return ("R_PREV");
rflag ? R_NEXT : R_PREV);