ST_HEADER
s = stab(fname, ST_HEADER, ST_ENTER);
s = stab(fname, ST_HEADER, ST_FIND);
s = stab("*", ST_HEADER, ST_FIND);
s = stab(hi->hi_field, ST_HEADER, ST_ENTER);
s = stab(field, ST_HEADER, ST_FIND);
case ST_HEADER: