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Issue #5016: FileIO.seekable() could return False if the file position

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was negative when truncated to a C int. Patch by Victor Stinner.
This commit is contained in:
Antoine Pitrou 2009-03-13 23:42:55 +00:00
parent 0ae29cf617
commit a28fcfdbda
3 changed files with 21 additions and 6 deletions
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10
Lib/test/test_largefile.py
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@ -133,6 +133,15 @@ class LargeFileTest(unittest.TestCase):
f.seek(0)
self.assertEqual(len(f.read()), 1) # else wasn't truncated
def test_seekable(self):
# Issue #5016; seekable() can return False when the current position
# is negative when truncated to an int.
for pos in (2**31-1, 2**31, 2**31+1):
with self.open(TESTFN, 'rb') as f:
f.seek(pos)
self.assert_(f.seekable())
def test_main():
# On Windows and Mac OSX this test comsumes large resources; It
# takes a long time to build the >2GB file and takes >2GB of disk
@ -172,6 +181,7 @@ def test_main():
with _open(TESTFN, 'wb') as f:
if hasattr(f, 'truncate'):
suite.addTest(TestCase('test_truncate'))
suite.addTest(TestCase('test_seekable'))
unlink(TESTFN)
try:
run_unittest(suite)