Issue #9696: Fix exception incorrectly raised by xdrlib.Packer.pack_int when trying to pack a negative (in-range) integer.

Lib/test/test_xdrlib.py

@@ -12,6 +12,7 @@ class XDRTest(unittest.TestCase):
         a = [b'what', b'is', b'hapnin', b'doctor']
 
         p.pack_int(42)
+        p.pack_int(-17)
         p.pack_uint(9)
         p.pack_bool(True)
         p.pack_bool(False)
@@ -29,6 +30,7 @@ class XDRTest(unittest.TestCase):
         self.assertEqual(up.get_position(), 0)
 
         self.assertEqual(up.unpack_int(), 42)
+        self.assertEqual(up.unpack_int(), -17)
         self.assertEqual(up.unpack_uint(), 9)
         self.assertTrue(up.unpack_bool() is True)
 

Lib/xdrlib.py

@@ -50,7 +50,9 @@ class Packer:
     def pack_uint(self, x):
         self.__buf.write(struct.pack('>L', x))
 
-    pack_int = pack_uint
+    def pack_int(self, x):
+        self.__buf.write(struct.pack('>l', x))
+
     pack_enum = pack_int
 
     def pack_bool(self, x):

Misc/ACKS

@@ -303,6 +303,7 @@ Eddy De Greef
 Duncan Grisby
 Fabian Groffen
 Dag Gruneau
+Filip Gruszczyński
 Michael Guravage
 Lars Gustäbel
 Thomas Güttler

Misc/NEWS

@@ -44,6 +44,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #9696: Fix exception incorrectly raised by xdrlib.Packer.pack_int when
+  trying to pack a negative (in-range) integer.
+
 - Issue #11675: multiprocessing.[Raw]Array objects created from an integer size
   are now zeroed on creation.  This matches the behaviour specified by the
   documentation.