parse_field_spec
p = parse_field_spec(nF, arg, OPTIONS_STARTSPEC, p_comma);
p = parse_field_spec(nF, &(arg[p_comma + 1]), 0,
p = parse_field_spec(nF, arg + 1, OPTIONS_OLDSPEC | OPTIONS_STARTSPEC,
(void) parse_field_spec(nF, arg + 1,