[3.5] bpo-29854: Backport to 3.5#2636
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If history-length is set in .inputrc, and the history file is double the history size (or more), history_get(N) returns NULL, and python segfaults. Fix that by checking for NULL return value. It seems that the root cause is incorrect handling of bigger history in readline, but Python should not segfault even if readline returns unexpected value. This issue affects only GNU readline. When using libedit emulation system history size option does not work.
Turns out that history-size was added in readline 6.0. This explain why this tests fail on FreeBSD when using readline 5.2. We skip now the history size if readline does not support it. See https://cnswww.cns.cwru.edu/php/chet/readline/CHANGES for details.
berkerpeksag
approved these changes
Jul 9, 2017
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Tested on Fedora 25, FreeBSD 10.3, FreeBSD 11.0, OS X 10.11.6.
@berkerpeksag, @Haypo please review.