datetime's strftime limits strings to 127 chars

[ericvsmith]

BPO	1557390
Nosy	@birkenfeld, @ericvsmith
Files	strftime.patch: Code and test 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 = None
closed_at = <Date 2006-09-30.11:17:57.000>
created_at = <Date 2006-09-12.19:35:42.000>
labels = ['extension-modules']
title = "datetime's strftime limits strings to 127 chars"
updated_at = <Date 2006-09-30.11:17:57.000>
user = 'https://github.com/ericvsmith'

bugs.python.org fields:

activity = <Date 2006-09-30.11:17:57.000>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = None
closer = None
components = ['Extension Modules']
creation = <Date 2006-09-12.19:35:42.000>
creator = 'eric.smith'
dependencies = []
files = ['7536']
hgrepos = []
issue_num = 1557390
keywords = ['patch']
message_count = 2.0
messages = ['51109', '51110']
nosy_count = 2.0
nosy_names = ['georg.brandl', 'eric.smith']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1557390'
versions = ['Python 2.5']

[ericvsmith]

See bug http://python.org/sf/1556784

By putting the length into a char, wrap_strftime()
restricts the format string to be 127 characters long.
This patch removes that restriction, but using Py_ssize_t.

Test included.

Patch is against release25-maint.

[birkenfeld]

Logged In: YES
user_id=849994

Thanks for the report, fixed in rev. 52072, 52073 (2.4),
52074 (2.5).