[pypy-issue] [issue1582] file.tell() has wrong position after failed seek with SEEK_CUR

[Alex Gaynor]

Alex Gaynor <alex.gaynor at gmail.com> added the comment:

Even more!

import os
from tempfile import TemporaryFile


CHUNK_SIZE = 25

with TemporaryFile('r+w') as f:
    f.write('123456789x12345678><123456789\n')

    f.seek(0, os.SEEK_END)
    f.seek(-CHUNK_SIZE, os.SEEK_CUR)
    f.read(CHUNK_SIZE)
    f.seek(-CHUNK_SIZE, os.SEEK_CUR)
    try:
        f.seek(-CHUNK_SIZE, os.SEEK_CUR)
    except IOError:
        pass
    else:
        raise AssertionError("Didn't raise IOError")
    print f.tell()

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<https://bugs.pypy.org/issue1582>
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