1 files changed, 30 insertions, 0 deletions
diff --git a/test/msan/wcsxfrm.cc b/test/msan/wcsxfrm.cc
new file mode 100644
index 000000000..f13c5d396
--- /dev/null
+++ b/test/msan/wcsxfrm.cc
@@ -0,0 +1,30 @@
+// RUN: %clangxx_msan -O0 -g %s -o %t && not %run %t
+
+#include <assert.h>
+#include <locale.h>
+#include <sanitizer/msan_interface.h>
+#include <stdlib.h>
+#include <wchar.h>
+
+int main(void) {
+  wchar_t q[10];
+  size_t n = wcsxfrm(q, L"abcdef", sizeof(q) / sizeof(wchar_t));
+  assert(n < sizeof(q));
+  __msan_check_mem_is_initialized(q, (n + 1) * sizeof(wchar_t));
+
+  locale_t loc = newlocale(LC_ALL_MASK, "", (locale_t)0);
+
+  __msan_poison(&q, sizeof(q));
+  n = wcsxfrm_l(q, L"qwerty", sizeof(q) / sizeof(wchar_t), loc);
+  assert(n < sizeof(q));
+  __msan_check_mem_is_initialized(q, (n + 1) * sizeof(wchar_t));
+
+  q[0] = 'A';
+  q[1] = '\x00';
+  __msan_poison(&q, sizeof(q));
+  wcsxfrm(NULL, q, 0);
+
+  // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
+  // CHECK:    in main {{.*}}wcsxfrm.cc:25
+  return 0;
+}