Function dn_parse_optarg_ipv4

freebsd/net/debugnet.c:880–924

};

static int
dn_parse_optarg_ipv4(struct my_inet_opt *opt)
{
	in_addr_t tmp;
	unsigned octet;
	int t;

	tmp = 0;
	for (octet = 0; octet < 4; octet++) {
		t = db_read_token_flags(DRT_WSPACE | DRT_DECIMAL);
		if (t != tNUMBER) {
			db_printf("%s:%s: octet %u expected number; found %d\n",
			    __func__, opt->printname, octet, t);
			return (EINVAL);
		}
		/*
		 * db_lex lexes '-' distinctly from the number itself, but
		 * let's document that invariant.
		 */
		MPASS(db_tok_number >= 0);

		if (db_tok_number > UINT8_MAX) {
			db_printf("%s:%s: octet %u out of range: %jd\n", __func__,
			    opt->printname, octet, (intmax_t)db_tok_number);
			return (EDOM);
		}

		/* Constructed host-endian and converted to network later. */
		tmp = (tmp << 8) | db_tok_number;

		if (octet < 3) {
			t = db_read_token_flags(DRT_WSPACE);
			if (t != tDOT) {
				db_printf("%s:%s: octet %u expected '.'; found"
				    " %d\n", __func__, opt->printname, octet,
				    t);
				return (EINVAL);
			}
		}
	}

	*opt->result = htonl(tmp);
	opt->has_opt = true;
	return (0);
}

int
debugnet_parse_ddb_cmd(const char *cmd, struct debugnet_ddb_config *result)