(Merge 3.3) Issue #17137: When an Unicode string is resized, the internal wide

character string (wstr) format is now cleared.
This commit is contained in:
Victor Stinner 2013-02-07 23:17:34 +01:00
commit cfd2c1b4cc
3 changed files with 22 additions and 0 deletions

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@ -2191,6 +2191,21 @@ class UnicodeTest(string_tests.CommonTest,
self.assertEqual(args[0], text)
self.assertEqual(len(args), 1)
def test_resize(self):
for length in range(1, 100, 7):
# generate a fresh string (refcount=1)
text = 'a' * length + 'b'
# fill wstr internal field
abc = text.encode('unicode_internal')
self.assertEqual(abc.decode('unicode_internal'), text)
# resize text: wstr field must be cleared and then recomputed
text += 'c'
abcdef = text.encode('unicode_internal')
self.assertNotEqual(abc, abcdef)
self.assertEqual(abcdef.decode('unicode_internal'), text)
class StringModuleTest(unittest.TestCase):
def test_formatter_parser(self):

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@ -10,6 +10,9 @@ What's New in Python 3.4.0 Alpha 1?
Core and Builtins
-----------------
- Issue #17137: When an Unicode string is resized, the internal wide character
string (wstr) format is now cleared.
- Issue #17043: The unicode-internal decoder no longer read past the end of
input buffer.

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@ -717,6 +717,10 @@ resize_compact(PyObject *unicode, Py_ssize_t length)
if (!PyUnicode_IS_ASCII(unicode))
_PyUnicode_WSTR_LENGTH(unicode) = length;
}
else if (_PyUnicode_HAS_WSTR_MEMORY(unicode)) {
PyObject_DEL(_PyUnicode_WSTR(unicode));
_PyUnicode_WSTR(unicode) = NULL;
}
#ifdef Py_DEBUG
unicode_fill_invalid(unicode, old_length);
#endif