format(float, str): integer overflow for huge precision

[vstinner]

BPO	18137
Nosy	@mdickinson, @vstinner, @serhiy-storchaka
Files	float_format_precision.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 2013-06-23.12:57:47.291>
created_at = <Date 2013-06-04.23:11:30.633>
labels = ['interpreter-core']
title = 'format(float, str): integer overflow for huge precision'
updated_at = <Date 2013-06-23.12:57:47.290>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2013-06-23.12:57:47.290>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2013-06-23.12:57:47.291>
closer = 'vstinner'
components = ['Interpreter Core']
creation = <Date 2013-06-04.23:11:30.633>
creator = 'vstinner'
dependencies = []
files = ['30465']
hgrepos = []
issue_num = 18137
keywords = ['patch']
message_count = 2.0
messages = ['190629', '191693']
nosy_count = 4.0
nosy_names = ['mark.dickinson', 'vstinner', 'python-dev', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue18137'
versions = ['Python 2.7', 'Python 3.3', 'Python 3.4']

[vstinner]

format(1.2, ".%sf" % (2**32 + 2)) returns "1.20": the integer overflow is not catced.

Attached patch fixes the issue.

[python-dev]

New changeset ef5175d08e7e by Victor Stinner in branch '3.3':
Issue bpo-18137: Detect integer overflow on precision in float.__format__() and
http://hg.python.org/cpython/rev/ef5175d08e7e

New changeset 81fef2666ebb by Victor Stinner in branch 'default':
(Merge 3.3) Issue bpo-18137: Detect integer overflow on precision in
http://hg.python.org/cpython/rev/81fef2666ebb

New changeset d2b4f59943fa by Victor Stinner in branch '2.7':
Issue bpo-18137: Detect integer overflow on precision in float.__format__()
http://hg.python.org/cpython/rev/d2b4f59943fa