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gh-159739: Respect readline limits after a short read - #159974
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JelleZijlstra merged 1 commit intoOct 22, 2026
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Backport to 3.15 and 3.14. Both branches use a bytearray instead of PyBytesWriter; the test lives in Lib/test/test_io.py on 3.14.
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Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14, 3.15. |
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Sorry, @jelle-openai and @JelleZijlstra, I could not cleanly backport this to Please backport manually with cherry_picker, see the devguide for more information. |
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GH-160246 is a backport of this pull request to the 3.15 branch. |
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When a binary
IOBasesubclass providespeek()andread()returns fewer bytes than requested,readline(size)calculates subsequent reads against the original limit instead of the number of bytes still allowed. It can consume and return more thansizebytes, leaving less data for the next read. Apply the remaining limit in both the C and pure-Python implementations.Backport to 3.15 and 3.14. Both branches use a bytearray instead of PyBytesWriter; the test lives in Lib/test/test_io.py on 3.14.