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Issue #4228: Pack negative values the same way as 2.4

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in struct's L format.
This commit is contained in:
Martin v. Löwis 2008-12-13 14:34:06 +00:00
parent ec96c0205b
commit 46d410616d
3 changed files with 21 additions and 6 deletions
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13
Lib/test/test_struct.py
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@ -3,6 +3,8 @@ import test.test_support
import struct
import array
import warnings
warnings.filterwarnings("ignore", "struct integer overflow masking is deprecated",
DeprecationWarning)
import sys
ISBIGENDIAN = sys.byteorder == "big"
@ -535,6 +537,17 @@ def test_1530559():
test_1530559()
## Issue 4228. Packing a negative unsigned long warns,
# but then still should give a value with the
# topmost bit set.
def test_issue4228():
# Packing a long may yield either 32 or 64 bits
x = struct.pack('L', -1)[:4]
vereq(x, '\xff'*4)
test_issue4228()
###########################################################################
# Packing and unpacking to/from buffers.