[libc] Add IN6_IS_ADDR_LOOPBACK
#172312
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[libc] Add IN6_IS_ADDR_LOOPBACK
#172312
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@llvm/pr-subscribers-libc Author: Connector Switch (c8ef) ChangesFull diff: https://github.com/llvm/llvm-project/pull/172312.diff 2 Files Affected:
diff --git a/libc/include/llvm-libc-macros/netinet-in-macros.h b/libc/include/llvm-libc-macros/netinet-in-macros.h
index f97a2dd0c3fda..3148aed6bb112 100644
--- a/libc/include/llvm-libc-macros/netinet-in-macros.h
+++ b/libc/include/llvm-libc-macros/netinet-in-macros.h
@@ -44,6 +44,15 @@
(__LLVM_LIBC_CAST(reinterpret_cast, uint32_t *, a)[2]) == 0 && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint32_t *, a)[3]) == 0)
+#define IN6_IS_ADDR_LOOPBACK(a) \
+ ((__LLVM_LIBC_CAST(reinterpret_cast, uint32_t *, a)[0]) == 0 && \
+ (__LLVM_LIBC_CAST(reinterpret_cast, uint32_t *, a)[1]) == 0 && \
+ (__LLVM_LIBC_CAST(reinterpret_cast, uint32_t *, a)[2]) == 0 && \
+ (__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[12]) == 0 && \
+ (__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[13]) == 0 && \
+ (__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[14]) == 0 && \
+ (__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[15]) == 1)
+
#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)
diff --git a/libc/test/include/netinet_in_test.cpp b/libc/test/include/netinet_in_test.cpp
index d70c780800858..15e57ccef7ac5 100644
--- a/libc/test/include/netinet_in_test.cpp
+++ b/libc/test/include/netinet_in_test.cpp
@@ -19,6 +19,11 @@ TEST(LlvmLibcNetinetInTest, IN6Macro) {
buff[i] = 0;
}
+ EXPECT_FALSE(IN6_IS_ADDR_LOOPBACK(buff));
+ buff[15] = 1;
+ EXPECT_TRUE(IN6_IS_ADDR_LOOPBACK(buff));
+ buff[15] = 0;
+
buff[0] = 0xfe;
buff[1] = 0x80;
EXPECT_TRUE(IN6_IS_ADDR_LINKLOCAL(buff));
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This was referenced Dec 16, 2025
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This patch adds the
IN6_IS_ADDR_LOOPBACKmacro, which checks whether an address is loopback address.