From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Sat, 8 Jul 2023 03:23:27 +0000 (+0900)
Subject: in-addr-util: introduce PTR_TO_IN4_ADDR() and IN4_ADDR_TO_PTR()
X-Git-Tag: v255-rc1~884^2~1
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9701be563ac6413a93451c53957102201b00a8af;p=thirdparty%2Fsystemd.git

in-addr-util: introduce PTR_TO_IN4_ADDR() and IN4_ADDR_TO_PTR()

These should be useful when an IPv4 address is used as a key of a
hashmap.
---

diff --git a/src/basic/in-addr-util.h b/src/basic/in-addr-util.h
index 95e73162b13..12720ca92f2 100644
--- a/src/basic/in-addr-util.h
+++ b/src/basic/in-addr-util.h
@@ -195,6 +195,16 @@ extern const struct hash_ops in_addr_data_hash_ops_free;
 extern const struct hash_ops in6_addr_hash_ops;
 extern const struct hash_ops in6_addr_hash_ops_free;
 
+static inline void PTR_TO_IN4_ADDR(const void *p, struct in_addr *ret) {
+        assert(ret);
+        ret->s_addr = (uint32_t) ((uintptr_t) p);
+}
+
+static inline void* IN4_ADDR_TO_PTR(const struct in_addr *a) {
+        assert(a);
+        return (void*) ((uintptr_t) a->s_addr);
+}
+
 #define IPV4_ADDRESS_FMT_STR     "%u.%u.%u.%u"
 #define IPV4_ADDRESS_FMT_VAL(address)              \
         be32toh((address).s_addr) >> 24,           \