SystemError with re.match(array)

[arigo]

BPO	1647541
Nosy	@arigo, @rhettinger
Files	empty-array.diff: v1

^{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/arigo'
closed_at = <Date 2007-04-02.22:54:42.000>
created_at = <Date 2007-01-30.00:04:47.000>
labels = ['extension-modules']
title = 'SystemError with re.match(array)'
updated_at = <Date 2007-04-02.22:54:42.000>
user = 'https://github.com/arigo'

bugs.python.org fields:

activity = <Date 2007-04-02.22:54:42.000>
actor = 'rhettinger'
assignee = 'arigo'
closed = True
closed_date = None
closer = None
components = ['Extension Modules']
creation = <Date 2007-01-30.00:04:47.000>
creator = 'arigo'
dependencies = []
files = ['2288']
hgrepos = []
issue_num = 1647541
keywords = []
message_count = 4.0
messages = ['31130', '31131', '31132', '31133']
nosy_count = 3.0
nosy_names = ['nnorwitz', 'arigo', 'rhettinger']
pr_nums = []
priority = 'low'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1647541'
versions = ['Python 2.5']

[arigo]

An small issue which I guess is to be found in
the implementation of the buffer interface
for zero-length arrays:

>>> a = array.array("c")
>>> r = re.compile("bla")
>>> r.match(a)
SystemError: error return without exception set

[nnorwitz]

Armin, what do you think of the attached patch?
File Added: empty-array.diff

[arigo]

It seems to me that an empty array should be
equivalent to an empty string. Accessing it as a
buffer should return a buffer of length 0, not
raise ValueError.

In all cases, the fix in _sre.c is sensible.

[rhettinger]

Fixed in versions 54662 and 54663.
Now returns a buffer of length zero other than NULL.