Incorrect handling MemoryError in readline.set_completer_delims

[serhiy-storchaka]

BPO	25203
Nosy	@Yhg1s, @serhiy-storchaka
Files	readline_set_completer_delims.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/serhiy-storchaka'
closed_at = <Date 2015-09-27.19:57:00.676>
created_at = <Date 2015-09-21.16:30:46.965>
labels = ['extension-modules', 'type-bug']
title = 'Incorrect handling MemoryError in readline.set_completer_delims'
updated_at = <Date 2015-09-27.19:57:00.495>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2015-09-27.19:57:00.495>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2015-09-27.19:57:00.676>
closer = 'serhiy.storchaka'
components = ['Extension Modules']
creation = <Date 2015-09-21.16:30:46.965>
creator = 'serhiy.storchaka'
dependencies = []
files = ['40535']
hgrepos = []
issue_num = 25203
keywords = ['patch']
message_count = 2.0
messages = ['251239', '251719']
nosy_count = 3.0
nosy_names = ['twouters', 'python-dev', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue25203'
versions = ['Python 2.7', 'Python 3.4', 'Python 3.5', 'Python 3.6']

[serhiy-storchaka]

MemoryError raised in readline.set_completer_delims() turns the readline library to incorrect state.

$ (ulimit -v 200000; ./python;)
Python 3.6.0a0 (default:e33b4c18af59+, Sep 17 2015, 17:05:17) 
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import readline
>>> readline.get_completer_delims()
' \t\n`~!@#$%^&*()-=+[{]}\\|;:\'",<>/?'
>>> readline.set_completer_delims(' '*10**8)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
MemoryError
>>> readline.get_completer_delims()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe4 in position 1: invalid continuation byte

Proposed patch fixes the issue.

[python-dev]

New changeset 46aaff5e8945 by Serhiy Storchaka in branch '3.4':
Issue bpo-25203: Failed readline.set_completer_delims() no longer left the
https://hg.python.org/cpython/rev/46aaff5e8945

New changeset d867ca794bdb by Serhiy Storchaka in branch '2.7':
Issue bpo-25203: Failed readline.set_completer_delims() no longer left the
https://hg.python.org/cpython/rev/d867ca794bdb

New changeset 0d3b64bbc82c by Serhiy Storchaka in branch '3.5':
Issue bpo-25203: Failed readline.set_completer_delims() no longer left the
https://hg.python.org/cpython/rev/0d3b64bbc82c

New changeset 48943533965e by Serhiy Storchaka in branch 'default':
Issue bpo-25203: Failed readline.set_completer_delims() no longer left the
https://hg.python.org/cpython/rev/48943533965e