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gh-80109: Fix io.TextIOWrapper dropping the internal buffer during write() (GH-22535)

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io.TextIOWrapper was dropping the internal decoding buffer
during read() and write() calls.
This commit is contained in:
Zackery Spytz 2024-01-08 02:33:34 -08:00 committed by GitHub
parent e5d0316f35
commit 73c9326563
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 24 additions and 8 deletions
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10
Lib/_pyio.py
View file

@ -2198,8 +2198,9 @@ def write(self, s):
self.buffer.write(b)
if self._line_buffering and (haslf or "\r" in s):
self.flush()
self._set_decoded_chars('')
self._snapshot = None
if self._snapshot is not None:
self._set_decoded_chars('')
self._snapshot = None
if self._decoder:
self._decoder.reset()
return length
@ -2513,8 +2514,9 @@ def read(self, size=None):
# Read everything.
result = (self._get_decoded_chars() +
decoder.decode(self.buffer.read(), final=True))
self._set_decoded_chars('')
self._snapshot = None
if self._snapshot is not None:
self._set_decoded_chars('')
self._snapshot = None
return result
else:
# Keep reading chunks until we have size characters to return.

8
Lib/test/test_io.py
View file

@ -3880,6 +3880,14 @@ def test_issue25862(self):
t.write('x')
t.tell()
def test_issue35928(self):
p = self.BufferedRWPair(self.BytesIO(b'foo\nbar\n'), self.BytesIO())
f = self.TextIOWrapper(p)
res = f.readline()
self.assertEqual(res, 'foo\n')
f.write(res)
self.assertEqual(res + f.readline(), 'foo\nbar\n')
class MemviewBytesIO(io.BytesIO):
'''A BytesIO object whose read method returns memoryviews

2
Misc/NEWS.d/next/Library/2020-10-03-23-47-28.bpo-35928.E0iPAa.rst Normal file
View file

@ -0,0 +1,2 @@
:class:`io.TextIOWrapper` now correctly handles the decoding buffer after
``read()`` and ``write()``.

12
Modules/_io/textio.c
View file

@ -1762,8 +1762,10 @@ _io_TextIOWrapper_write_impl(textio *self, PyObject *text)
}
}
textiowrapper_set_decoded_chars(self, NULL);
Py_CLEAR(self->snapshot);
if (self->snapshot != NULL) {
textiowrapper_set_decoded_chars(self, NULL);
Py_CLEAR(self->snapshot);
}
if (self->decoder) {
ret = PyObject_CallMethodNoArgs(self->decoder, &_Py_ID(reset));
@ -1999,8 +2001,10 @@ _io_TextIOWrapper_read_impl(textio *self, Py_ssize_t n)
if (result == NULL)
goto fail;
textiowrapper_set_decoded_chars(self, NULL);
Py_CLEAR(self->snapshot);
if (self->snapshot != NULL) {
textiowrapper_set_decoded_chars(self, NULL);
Py_CLEAR(self->snapshot);
}
return result;
}
else {