From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Sun, 14 Nov 2021 06:24:20 +0000 (+0900)
Subject: in-addr-util: introduce FAMILY_ADDRESS_SIZE_SAFE() macro
X-Git-Tag: v250-rc1~143^2~14
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f9930401d53a2f5c581fab5d58906772f3fc1fa8;p=thirdparty%2Fsystemd.git

in-addr-util: introduce FAMILY_ADDRESS_SIZE_SAFE() macro
---

diff --git a/src/basic/in-addr-util.h b/src/basic/in-addr-util.h
index 97715a230cd..0178391e5f2 100644
--- a/src/basic/in-addr-util.h
+++ b/src/basic/in-addr-util.h
@@ -114,6 +114,13 @@ static inline size_t FAMILY_ADDRESS_SIZE(int family) {
         return family == AF_INET6 ? 16 : 4;
 }
 
+#define FAMILY_ADDRESS_SIZE_SAFE(f)                                     \
+        ({                                                              \
+                int _f = (f);                                           \
+                _f == AF_INET ? sizeof(struct in_addr) :                \
+                _f == AF_INET6 ? sizeof(struct in6_addr) : 0;           \
+        })
+
 /* Workaround for clang, explicitly specify the maximum-size element here.
  * See also oss-fuzz#11344. */
 #define IN_ADDR_NULL ((union in_addr_union) { .in6 = {} })