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[libc] Add IN6_IS_ADDR_UNSPECIFIED #172311

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[libc] Add IN6_IS_ADDR_UNSPECIFIED #172311

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6 changes: 6 additions & 0 deletions libc/include/llvm-libc-macros/netinet-in-macros.h
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,12 @@
// int and takes a single argument of type const struct in6_addr *:
// https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/netinet_in.h.html

#define IN6_IS_ADDR_UNSPECIFIED(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, uint32_t *, a)[3]) == 0)

#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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7 changes: 7 additions & 0 deletions libc/test/include/netinet_in_test.cpp
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Expand Up @@ -12,6 +12,13 @@
TEST(LlvmLibcNetinetInTest, IN6Macro) {
char buff[16] = {};

EXPECT_TRUE(IN6_IS_ADDR_UNSPECIFIED(buff));
for (int i = 0; i < 16; ++i) {
buff[i] = 1;
EXPECT_FALSE(IN6_IS_ADDR_UNSPECIFIED(buff));
buff[i] = 0;
}

buff[0] = 0xfe;
buff[1] = 0x80;
EXPECT_TRUE(IN6_IS_ADDR_LINKLOCAL(buff));
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