Add unit test for parsing host name

Test case for #822

unittest/private.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2015-2019 the Civetweb developers
+/* Copyright (c) 2015-2020 the Civetweb developers
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -596,7 +596,7 @@ END_TEST
 START_TEST(test_parse_port_string)
 {
 	/* Adapted from unit_test.c */
-	/* Copyright (c) 2013-2018 the Civetweb developers */
+	/* Copyright (c) 2013-2020 the Civetweb developers */
 	/* Copyright (c) 2004-2013 Sergey Lyubka */
 	struct t_test_parse_port_string {
 		const char *port_string;
@@ -685,6 +685,16 @@ START_TEST(test_parse_port_string)
 			ck_assert_int_eq(htons(so.lsa.sin.sin_port), testdata[i].port_num);
 		}
 	}
+
+	/* special case: localhost can be ipv4 or ipv6 */
+	vec.ptr = "localhost:123";
+	vec.len = strlen(vec.ptr);
+	ret = parse_port_string(&vec, &so, &ip_family);
+	ck_assert_int_eq(ret, 1);
+	if ((ip_family != 4) && (ip_family != 6)) {
+		ck_abort_msg("IP family must be 4 or 6 but is %i", (int)ip_family);
+	}
+	ck_assert_int_eq((int)htons(so.lsa.sin.sin_port), (int)123);
 }
 END_TEST