[libc-commits] [libc] [libc] Add `IN6_IS_ADDR_{LINK, SITE}LOCAL` (PR #168207)

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@@ -33,4 +33,12 @@
 #define INET_ADDRSTRLEN 16
 #define INET6_ADDRSTRLEN 46
 
+#define IN6_IS_ADDR_LINKLOCAL(a)                                               \
+  ((__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[0]) == 0xfe &&            \
+   (__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[1] & 0xc0) == 0x80)
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c8ef wrote:

Done.

https://github.com/llvm/llvm-project/pull/168207