Patch #1549049: Rewrite type conversion in structmember.

Fixes #1545696 and #1566140. Will backport to 2.5.

Lib/test/test_structmembers.py

@@ -0,0 +1,80 @@
+from _testcapi import test_structmembersType, \
+    CHAR_MAX, CHAR_MIN, UCHAR_MAX, \
+    SHRT_MAX, SHRT_MIN, USHRT_MAX, \
+    INT_MAX, INT_MIN, UINT_MAX, \
+    LONG_MAX, LONG_MIN, ULONG_MAX
+
+import warnings, exceptions, unittest, test.test_warnings
+from test import test_support
+
+ts=test_structmembersType(1,2,3,4,5,6,7,8,9.99999,10.1010101010)
+
+class ReadWriteTests(unittest.TestCase):
+    def test_types(self):
+        ts.T_BYTE=CHAR_MAX
+        self.assertEquals(ts.T_BYTE, CHAR_MAX)
+        ts.T_BYTE=CHAR_MIN
+        self.assertEquals(ts.T_BYTE, CHAR_MIN)
+        ts.T_UBYTE=UCHAR_MAX
+        self.assertEquals(ts.T_UBYTE, UCHAR_MAX)
+
+        ts.T_SHORT=SHRT_MAX
+        self.assertEquals(ts.T_SHORT, SHRT_MAX)
+        ts.T_SHORT=SHRT_MIN
+        self.assertEquals(ts.T_SHORT, SHRT_MIN)
+        ts.T_USHORT=USHRT_MAX
+        self.assertEquals(ts.T_USHORT, USHRT_MAX)
+
+        ts.T_INT=INT_MAX
+        self.assertEquals(ts.T_INT, INT_MAX)
+        ts.T_INT=INT_MIN
+        self.assertEquals(ts.T_INT, INT_MIN)
+        ts.T_UINT=UINT_MAX
+        self.assertEquals(ts.T_UINT, UINT_MAX)
+
+        ts.T_LONG=LONG_MAX
+        self.assertEquals(ts.T_LONG, LONG_MAX)
+        ts.T_LONG=LONG_MIN
+        self.assertEquals(ts.T_LONG, LONG_MIN)
+        ts.T_ULONG=ULONG_MAX
+        self.assertEquals(ts.T_ULONG, ULONG_MAX)
+
+class TestWarnings(test.test_warnings.TestModule):
+    def has_warned(self):
+        self.assertEqual(test.test_warnings.msg.category,
+                         exceptions.RuntimeWarning.__name__)
+        
+    def test_byte_max(self):
+        ts.T_BYTE=CHAR_MAX+1
+        self.has_warned()
+        
+    def test_byte_min(self):
+        ts.T_BYTE=CHAR_MIN-1
+        self.has_warned()
+
+    def test_ubyte_max(self):
+        ts.T_UBYTE=UCHAR_MAX+1
+        self.has_warned()
+
+    def test_short_max(self):
+        ts.T_SHORT=SHRT_MAX+1
+        self.has_warned()
+
+    def test_short_min(self):
+        ts.T_SHORT=SHRT_MIN-1
+        self.has_warned()
+
+    def test_ushort_max(self):
+        ts.T_USHORT=USHRT_MAX+1
+        self.has_warned()
+
+        
+
+def test_main(verbose=None):
+    test_support.run_unittest(
+        ReadWriteTests,
+        TestWarnings
+        )
+
+if __name__ == "__main__":
+    test_main(verbose=True)