Alexandre Julliard : ntdll: Add strncpy_s and wcsncpy_s.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 94e960c861c013771d72022ef994d38e937cef58
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=94e960c861c013771d72022ef994d38e937cef58

Author: Alexandre Julliard <julliard at winehq.org>
Date:   Wed Jun 29 11:49:38 2022 +0200

ntdll: Add strncpy_s and wcsncpy_s.

Implementation copied from msvcrt.

Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/ntdll/ntdll.spec |  2 ++
 dlls/ntdll/string.c   | 42 ++++++++++++++++++++++++++++++++++++++++++
 dlls/ntdll/wcstring.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 86 insertions(+)

diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index 1e94d23c7df..95b2e652b3d 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -1597,6 +1597,7 @@
 @ cdecl strncat(str str long)
 @ cdecl strncmp(str str long)
 @ cdecl strncpy(ptr str long)
+@ cdecl strncpy_s(ptr long str long)
 @ cdecl strnlen(ptr long)
 @ cdecl strpbrk(str str)
 @ cdecl strrchr(str long)
@@ -1627,6 +1628,7 @@
 @ cdecl wcsncat(wstr wstr long)
 @ cdecl wcsncmp(wstr wstr long)
 @ cdecl wcsncpy(ptr wstr long)
+@ cdecl wcsncpy_s(ptr long wstr long)
 @ cdecl wcsnlen(ptr long)
 @ cdecl wcspbrk(wstr wstr)
 @ cdecl wcsrchr(wstr long)
diff --git a/dlls/ntdll/string.c b/dlls/ntdll/string.c
index 8a37cd6d8d4..212cd30e2f1 100644
--- a/dlls/ntdll/string.c
+++ b/dlls/ntdll/string.c
@@ -356,6 +356,48 @@ char * __cdecl strncpy( char *dst, const char *src, size_t len )
 }
 
 
+/*********************************************************************
+ *                  strncpy_s   (NTDLL.@)
+ */
+errno_t __cdecl strncpy_s( char *dst, size_t len, const char *src, size_t count )
+{
+    size_t i, end;
+
+    if (!count)
+    {
+        if (dst && len) *dst = 0;
+        return 0;
+    }
+    if (!dst || !len) return EINVAL;
+    if (!src)
+    {
+        *dst = 0;
+        return EINVAL;
+    }
+
+    if (count != _TRUNCATE && count < len)
+        end = count;
+    else
+        end = len - 1;
+
+    for (i = 0; i < end; i++)
+        if (!(dst[i] = src[i])) return 0;
+
+    if (count == _TRUNCATE)
+    {
+        dst[i] = 0;
+        return STRUNCATE;
+    }
+    if (end == count)
+    {
+        dst[i] = 0;
+        return 0;
+    }
+    dst[0] = 0;
+    return ERANGE;
+}
+
+
 /*********************************************************************
  *                  strnlen   (NTDLL.@)
  */
diff --git a/dlls/ntdll/wcstring.c b/dlls/ntdll/wcstring.c
index d5e50981153..cb45986207d 100644
--- a/dlls/ntdll/wcstring.c
+++ b/dlls/ntdll/wcstring.c
@@ -292,6 +292,48 @@ LPWSTR __cdecl wcsncpy( LPWSTR s1, LPCWSTR s2, size_t n )
 }
 
 
+/*********************************************************************
+ *           wcsncpy_s    (NTDLL.@)
+ */
+errno_t __cdecl wcsncpy_s( wchar_t *dst, size_t len, const wchar_t *src, size_t count )
+{
+    size_t i, end;
+
+    if (!count)
+    {
+        if (dst && len) *dst = 0;
+        return 0;
+    }
+    if (!dst || !len) return EINVAL;
+    if (!src)
+    {
+        *dst = 0;
+        return EINVAL;
+    }
+
+    if (count != _TRUNCATE && count < len)
+        end = count;
+    else
+        end = len - 1;
+
+    for (i = 0; i < end; i++)
+        if (!(dst[i] = src[i])) return 0;
+
+    if (count == _TRUNCATE)
+    {
+        dst[i] = 0;
+        return STRUNCATE;
+    }
+    if (end == count)
+    {
+        dst[i] = 0;
+        return 0;
+    }
+    dst[0] = 0;
+    return ERANGE;
+}
+
+
 /*********************************************************************
  *           wcsnlen    (NTDLL.@)
  */