basic: add explicit ipv4-specific in_addr classification calls

This adds in4_addr_is_localhost() and in4_addr_is_link_local() that only take
an IPv4 "struct in_addr", to match in_addr_is_localhost() and
in_addr_is_link_local() that that a "union in_addr_union".

This matches the existing in4_addr_is_null() call that already exists.

For IPv6 glibc already exports a set of macros, hence we don't add similar
functions in6_addr_is_localhost(). We also drop in6_addr_is_null() as
IN6_IS_ADDR_UNSPECIFIED() already provides that.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/basic/in-addr-util.h b/src/basic/in-addr-util.h
index d60064aef8..64a812c322 100644
--- a/src/basic/in-addr-util.h
+++ b/src/basic/in-addr-util.h
@@ -37,11 +37,14 @@ struct in_addr_data {
 };
 
 bool in4_addr_is_null(const struct in_addr *a);
-bool in6_addr_is_null(const struct in6_addr *a);
-
 int in_addr_is_null(int family, const union in_addr_union *u);
+
+bool in4_addr_is_link_local(const struct in_addr *a);
 int in_addr_is_link_local(int family, const union in_addr_union *u);
+
+bool in4_addr_is_localhost(const struct in_addr *a);
 int in_addr_is_localhost(int family, const union in_addr_union *u);
+
 int in_addr_equal(int family, const union in_addr_union *a, const union in_addr_union *b);
 int in_addr_prefix_intersect(int family, const union in_addr_union *a, unsigned aprefixlen, const union in_addr_union *b, unsigned bprefixlen);
 int in_addr_prefix_next(int family, union in_addr_union *u, unsigned prefixlen);