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gh-159739: Respect readline limits after a short read - #159974
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jelle-openai wants to merge 1 commit into
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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.
JelleZijlstra
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needs backport to 3.14
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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.