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The 'p' (Pascal string) pack code acts unreasonably when the string size

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and count exceed 255.  Changed to preserve as much of the string as
possible (instead of count%256 characters).
This commit is contained in:
Tim Peters 2001-09-15 02:35:15 +00:00
parent 1048aa933f
commit 0891ac017d
2 changed files with 27 additions and 0 deletions
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25
Lib/test/test_struct.py
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@ -368,3 +368,28 @@ for args in [("bB", 1),
("qQ", 8)]:
t = IntTester(*args)
t.run()
###########################################################################
# The p ("Pascal string") code.
def test_p_code():
for code, input, expected, expectedback in [
('p','abc', '\x00', ''),
('1p', 'abc', '\x00', ''),
('2p', 'abc', '\x01a', 'a'),
('3p', 'abc', '\x02ab', 'ab'),
('4p', 'abc', '\x03abc', 'abc'),
('5p', 'abc', '\x03abc\x00', 'abc'),
('6p', 'abc', '\x03abc\x00\x00', 'abc'),
('1000p', 'x'*1000, '\xff' + 'x'*999, 'x'*255)]:
got = struct.pack(code, input)
if got != expected:
raise TestFailed("pack(%r, %r) == %r but expected %r" %
(code, input, got, expected))
(got,) = struct.unpack(code, got)
if got != expectedback:
raise TestFailed("unpack(%r, %r) == %r but expected %r" %
(code, input, got, expectedback))
test_p_code()