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[3.11] gh-80109: Fix io.TextIOWrapper dropping the internal buffer during write() (GH-22535) (GH-113809)

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io.TextIOWrapper was dropping the internal decoding buffer
during read() and write() calls.
(cherry picked from commit 73c9326563)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
This commit is contained in:
Miss Islington (bot) 2024-01-08 11:47:50 +01:00 • committed by GitHub
parent 320c160b1a
commit 4db8d3be49
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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
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@ -2224,8 +2224,9 @@ class TextIOWrapper(TextIOBase):
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
@ -2539,8 +2540,9 @@ class TextIOWrapper(TextIOBase):
# 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.