[issue23414] seek(count, whence) accepts bogus whence on windows, python2.7

[Ned Deily]

Change by Ned Deily :


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resolution:  -> wont fix
stage:  -> resolved
status: open -> closed

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[issue23414] seek(count, whence) accepts bogus whence on windows, python2.7

[Zackery Spytz]

Zackery Spytz  added the comment:

Python 2 is EOL.

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nosy: +ZackerySpytz

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[issue23414] seek(count, whence) accepts bogus whence on windows, python2.7

[Steve Dower]

Steve Dower added the comment:

I can't say why 2.7 doesn't use _fseeki64, but 3.5 certainly does. 

Possibly it's a significant change of behaviour that would break backwards 
compatibility? Making a currently working call raise new exceptions is 
certainly worth double-checking before introducing into a maintenance release.

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[issue23414] seek(count, whence) accepts bogus whence on windows, python2.7

[eryksun]

eryksun added the comment:

The whence argument is used in a switch statement that handles SEEK_END and 
SEEK_CUR. It doesn't raise an error for an invalid whence value. It just falls 
through to the fsetpos call.

_portable_fseek
https://hg.python.org/cpython/file/648dcafa7e5f/Objects/fileobject.c#l692

0:000> k 3
Child-SP  RetAddr   Call Site
`0021fa68 `1e0ac84f MSVCR90!fsetpos
`0021fa70 `1e0aeea3 python27!_portable_fseek+0x6f
`0021faa0 `1e0c3d09 python27!file_seek+0x123

Why does it manually handle whence and call fgetpos/fsetpos instead of calling 
_fseeki64?

fseek, _fseeki64
https://msdn.microsoft.com/en-us/library/75yw9bf3%28v=vs.90%29.aspx

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[issue23414] seek(count, whence) accepts bogus whence on windows, python2.7

[mattip]

New submission from mattip:

f=open('abc.txt', 'w+')
f.seek(0, 42)

does not raise an exception on windows, python2.7

--
components: Windows
messages: 235568
nosy: mattip, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: seek(count, whence) accepts bogus whence on windows, python2.7
type: behavior
versions: Python 2.7

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