Index: include/crt/string.h
===================================================================
--- include/crt/string.h	(revision 69810)
+++ include/crt/string.h	(working copy)
@@ -1057,6 +1057,24 @@
     _In_ size_t _Size,
     _In_opt_ _locale_t _Locale);
 
+  _CRTIMP
+  errno_t
+  __cdecl
+  memcpy_s(_Out_writes_bytes_to_opt_(_DstSize, _MaxCount) void * _Dst,
+    _In_ size_t _DstSize,
+    _In_reads_bytes_opt_(_MaxCount) const void * _Src,
+    _In_ size_t _MaxCount);
+
+  _Check_return_wat_
+  _CRTIMP
+  errno_t
+  __cdecl
+  memmove_s(
+    _Out_writes_bytes_to_opt_(_DstSize, _MaxCount) void * _Dst,
+    _In_ size_t _DstSize,
+    _In_reads_bytes_opt_(_MaxCount) const void * _Src,
+    _In_ size_t _MaxCount);
+
 #endif /* __STDC_WANT_SECURE_LIB__ */
 
 #ifndef NO_OLDNAMES
Index: lib/sdk/crt/mem/memcpy.c
===================================================================
--- lib/sdk/crt/mem/memcpy.c	(revision 69810)
+++ lib/sdk/crt/mem/memcpy.c	(working copy)
@@ -38,3 +38,47 @@
 
     return dest;
 }
+
+int CDECL MSVCRT_memcpy_s(void *dest, MSVCRT_size_t numberOfElements, const void *src, MSVCRT_size_t count)
+{
+    if (!count)
+        return 0;
+
+    if (!MSVCRT_CHECK_PMT(dest != NULL)) return MSVCRT_EINVAL;
+    if (!MSVCRT_CHECK_PMT(src != NULL))
+    {
+        memset(dest, 0, numberOfElements);
+        return MSVCRT_EINVAL;
+    }
+    if (!MSVCRT_CHECK_PMT_ERR(count <= numberOfElements, MSVCRT_ERANGE))
+    {
+        memset(dest, 0, numberOfElements);
+        return MSVCRT_ERANGE;
+    }
+
+    memcpy(dest, src, count);
+    return 0;
+}
+
+int CDECL wmemcpy_s(MSVCRT_wchar_t *dest, MSVCRT_size_t numberOfElements,
+                    const MSVCRT_wchar_t *src, MSVCRT_size_t count)
+{
+    if (!count)
+        return 0;
+
+    if (!MSVCRT_CHECK_PMT(dest != NULL)) return MSVCRT_EINVAL;
+
+    if (!MSVCRT_CHECK_PMT(src != NULL))
+    {
+        memset(dest, 0, numberOfElements*sizeof(MSVCRT_wchar_t));
+        return MSVCRT_EINVAL;
+    }
+    if (!MSVCRT_CHECK_PMT_ERR(count <= numberOfElements, MSVCRT_ERANGE))
+    {
+        memset(dest, 0, numberOfElements*sizeof(MSVCRT_wchar_t));
+        return MSVCRT_ERANGE;
+    }
+
+    memcpy(dest, src, sizeof(MSVCRT_wchar_t)*count);
+    return 0;
+}
\ No newline at end of file
Index: lib/sdk/crt/mem/memmove.c
===================================================================
--- lib/sdk/crt/mem/memmove.c	(revision 69810)
+++ lib/sdk/crt/mem/memmove.c	(working copy)
@@ -34,3 +34,36 @@
 
     return dest;
 }
+
+//int CDECL memmove_s(void *dest, size_t numberOfElements, const void *, size_t count)
+_Check_return_wat_ _CRTIMP errno_t __cdecl 
+memmove_s(_Out_writes_bytes_to_opt_(numberOfElements, _MaxCount) void * dest, _In_ rsize_t numberOfElements, _In_reads_bytes_opt_(count) const void * src, _In_ rsize_t count);
+{
+    if (!count)
+        return 0;
+
+    if (!MSVCRT_CHECK_PMT(dest != NULL)) return MSVCRT_EINVAL;
+    if (!MSVCRT_CHECK_PMT(src != NULL)) return MSVCRT_EINVAL;
+    if (!MSVCRT_CHECK_PMT_ERR(count <= numberOfElements, MSVCRT_ERANGE)) return MSVCRT_ERANGE;
+
+    memmove(dest, src, count);
+    return 0;
+}
+
+int CDECL wmemmove_s(MSVCRT_wchar_t *dest, MSVCRT_size_t numberOfElements,
+                     const MSVCRT_wchar_t *src, MSVCRT_size_t count)
+{
+    if (!count)
+        return 0;
+
+    /* Native does not seem to conform to 6.7.1.2.3 in
+    * http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1225.pdf
+    * in that it does not zero the output buffer on constraint violation.
+    */
+    if (!MSVCRT_CHECK_PMT(dest != NULL)) return MSVCRT_EINVAL;
+    if (!MSVCRT_CHECK_PMT(src != NULL)) return MSVCRT_EINVAL;
+    if (!MSVCRT_CHECK_PMT_ERR(count <= numberOfElements, MSVCRT_ERANGE)) return MSVCRT_ERANGE;
+
+    memmove(dest, src, sizeof(MSVCRT_wchar_t)*count);
+    return 0;
+}
\ No newline at end of file