Extra tests for using a 3-bytes struct as a return type

2 files changed, 47 insertions, 0 deletions

diff --git a/testing/cffi0/test_function.py b/testing/cffi0/test_function.py
index 6312707..4f2c864 100644
--- a/testing/cffi0/test_function.py
+++ b/testing/cffi0/test_function.py
@@ -240,6 +240,23 @@ class TestFunction(object):
             else:
                 assert "None" in printed
 
+    def test_callback_returning_struct_three_bytes(self):
+        if self.Backend is CTypesBackend:
+            py.test.skip("not supported with the ctypes backend")
+        ffi = FFI(backend=self.Backend())
+        ffi.cdef("""
+            typedef struct {
+                unsigned char a, b, c;
+            } THREEBYTES;
+        """)
+        def cb():
+            return (12, 34, 56)
+        fptr = ffi.callback("THREEBYTES(*)(void)", cb)
+        tb = fptr()
+        assert tb.a == 12
+        assert tb.b == 34
+        assert tb.c == 56
+
     def test_passing_array(self):
         ffi = FFI(backend=self.Backend())
         ffi.cdef("""
diff --git a/testing/cffi0/test_ownlib.py b/testing/cffi0/test_ownlib.py
index 990f259..6a69cf6 100644
--- a/testing/cffi0/test_ownlib.py
+++ b/testing/cffi0/test_ownlib.py
@@ -35,6 +35,10 @@ typedef struct {
     long bottom;
 } RECT;
 
+typedef struct {
+    unsigned char a, b, c;
+} THREEBYTES;
+
 
 EXPORT int PointInRect(RECT *prc, POINT pt)
 {
@@ -107,6 +111,15 @@ EXPORT void modify_struct_value(RECT r)
 {
     r.left = r.right = r.top = r.bottom = 500;
 }
+
+EXPORT THREEBYTES return_three_bytes(void)
+{
+    THREEBYTES result;
+    result.a = 12;
+    result.b = 34;
+    result.c = 56;
+    return result;
+}
 """
 
 class TestOwnLib(object):
@@ -397,3 +410,20 @@ class TestOwnLib(object):
 
         err = lib1.dlclose(handle)
         assert err == 0
+
+    def test_return_three_bytes(self):
+        if self.module is None:
+            py.test.skip("fix the auto-generation of the tiny test lib")
+        ffi = FFI(backend=self.Backend())
+        ffi.cdef("""
+            typedef struct {
+                unsigned char a, b, c;
+            } THREEBYTES;
+
+            THREEBYTES return_three_bytes(void);
+        """)
+        lib = ffi.dlopen(self.module)
+        tb = lib.return_three_bytes()
+        assert tb.a == 12
+        assert tb.b == 34
+        assert tb.c == 56