Rooting out more undefined behavior in char_traits.

llvm-svn: 229119

4 files changed, 6 insertions, 0 deletions

diff --git a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign3.pass.cpp b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign3.pass.cpp
index 4c5ff479d9f..2a00fe06e5a 100644
--- a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign3.pass.cpp
+++ b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/assign3.pass.cpp
@@ -24,4 +24,5 @@ int main()
     assert(s2[0] == wchar_t(5));
     assert(s2[1] == wchar_t(5));
     assert(s2[2] == wchar_t(5));
+    assert(std::char_traits<wchar_t>::assign(NULL, 0, wchar_t(5)) == NULL);
 }
diff --git a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/copy.pass.cpp b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/copy.pass.cpp
index 71ed6fb8a30..f6d254f4c7c 100644
--- a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/copy.pass.cpp
+++ b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/copy.pass.cpp
@@ -24,4 +24,6 @@ int main()
     assert(s2[0] == wchar_t(1));
     assert(s2[1] == wchar_t(2));
     assert(s2[2] == wchar_t(3));
+    assert(std::char_traits<wchar_t>::copy(NULL, s1, 0) == NULL);
+    assert(std::char_traits<wchar_t>::copy(s1, NULL, 0) == s1);
 }
diff --git a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/find.pass.cpp b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/find.pass.cpp
index 49757390e02..ead3f32fcc7 100644
--- a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/find.pass.cpp
+++ b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/find.pass.cpp
@@ -24,4 +24,5 @@ int main()
     assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(3)) == s1+2);
     assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(4)) == 0);
     assert(std::char_traits<wchar_t>::find(s1, 3, wchar_t(0)) == 0);
+    assert(std::char_traits<wchar_t>::find(NULL, 0, wchar_t(0)) == 0);
 }
diff --git a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/move.pass.cpp b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/move.pass.cpp
index f19fa93e0c6..0d80446e711 100644
--- a/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/move.pass.cpp
+++ b/libcxx/test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.wchar.t/move.pass.cpp
@@ -28,4 +28,6 @@ int main()
     assert(s1[0] == wchar_t(2));
     assert(s1[1] == wchar_t(2));
     assert(s1[2] == wchar_t(3));
+    assert(std::char_traits<wchar_t>::move(NULL, s1, 0) == NULL);
+    assert(std::char_traits<wchar_t>::move(s1, NULL, 0) == s1);
 }