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Avoid raising OverflowError in truncate() if possible #74005

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Avoid raising OverflowError in truncate() if possible#74005
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3.7 (EOL)end of lifestdlibStandard Library Python modules in the Lib/ directorytopic-IOtype-featureA feature request or enhancement

Description

@serhiy-storchaka
serhiy-storchaka
opened on Mar 15, 2017
BPO 29819
Nosy @vstinner, @benjaminp, @serhiy-storchaka, @orenmn, @nanjekyejoannah
Dependencies
  • bpo-29852: Argument Clinic: add common converter to Py_ssize_t that accepts None
    		•

    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 = None
created_at = <Date 2017-03-15.15:11:06.614>
labels = ['3.7', 'type-feature', 'library', 'expert-IO']
title = 'Avoid raising OverflowError in truncate() if possible'
updated_at = <Date 2019-05-27.16:44:36.338>
user = 'https://github.com/serhiy-storchaka'

    bugs.python.org fields:

    activity = <Date 2019-05-27.16:44:36.338>
actor = 'nanjekyejoannah'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)', 'IO']
creation = <Date 2017-03-15.15:11:06.614>
creator = 'serhiy.storchaka'
dependencies = ['29852']
files = []
hgrepos = []
issue_num = 29819
keywords = []
message_count = 2.0
messages = ['289677', '289848']
nosy_count = 6.0
nosy_names = ['vstinner', 'benjamin.peterson', 'stutzbach', 'serhiy.storchaka', 'Oren Milman', 'nanjekyejoannah']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue29819'
versions = ['Python 3.7']

    Activity

    1. serhiy-storchaka commented on Mar 15, 2017

      @serhiy-storchaka
      serhiy-storchaka
      on Mar 15, 2017
      MemberAuthor

      os.truncate(), os.ftruncate() and truncate() methods of file-like objects raise OverflowError when the argument is out of ranger of certain C type. It would be better to extend the behavior of small integers to large integers. ValueError is raised for negative integers and it should be raised for negative integers out of range. Values larger than the current size should be ignored in BytesIO.truncate() and StringIO.truncate(). BytesIO.truncate() and StringIO.truncate() should never raise OverflowError. Since the behavior of underlying OS functions is OS and FS depended, OverflowError can be raised for large integers in os.truncate(), os.ftruncate() and FileIO.truncate().

    2. serhiy-storchaka
      added
      3.7 (EOL)end of life
      stdlibStandard Library Python modules in the Lib/ directory
      topic-IO
      type-featureA feature request or enhancement
      on Mar 15, 2017

    3. serhiy-storchaka commented on Mar 19, 2017

      @serhiy-storchaka
      serhiy-storchaka
      on Mar 19, 2017
      MemberAuthor

      bpo-29852 is not strict dependency, but it may make the solution of this issue simpler.

    4. ezio-melotti
      transferred this issue fromon Apr 10, 2022
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