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Issue #6939: Fix file I/O objects in the io module to keep the original

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file position when calling `truncate()`.  It would previously change the
file position to the given argument, which goes against the tradition of
`ftruncate()` and other truncation APIs.  Patch by Pascal Chambon.
This commit is contained in:
Antoine Pitrou 2010-01-27 21:48:46 +00:00
parent f333014467
commit ca5a06aaa9
7 changed files with 81 additions and 28 deletions
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11
Lib/test/test_io.py
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@ -87,6 +87,12 @@ class IOTest(unittest.TestCase):
test_support.unlink(test_support.TESTFN)
def write_ops(self, f):
self.assertEqual(f.write(b"blah."), 5)
f.truncate(0)
self.assertEqual(f.tell(), 5)
f.seek(0)
self.assertEqual(f.write(b"blah."), 5)
self.assertEqual(f.seek(0), 0)
self.assertEqual(f.write(b"Hello."), 6)
@ -98,8 +104,9 @@ class IOTest(unittest.TestCase):
self.assertEqual(f.write(b"h"), 1)
self.assertEqual(f.seek(-1, 2), 13)
self.assertEqual(f.tell(), 13)
self.assertEqual(f.truncate(12), 12)
self.assertEqual(f.tell(), 12)
self.assertEqual(f.tell(), 13)
self.assertRaises(TypeError, f.seek, 0.0)
def read_ops(self, f, buffered=False):
@ -144,7 +151,7 @@ class IOTest(unittest.TestCase):
self.assertEqual(f.tell(), self.LARGE + 2)
self.assertEqual(f.seek(0, 2), self.LARGE + 2)
self.assertEqual(f.truncate(self.LARGE + 1), self.LARGE + 1)
self.assertEqual(f.tell(), self.LARGE + 1)
self.assertEqual(f.tell(), self.LARGE + 2)
self.assertEqual(f.seek(0, 2), self.LARGE + 1)
self.assertEqual(f.seek(-1, 2), self.LARGE)
self.assertEqual(f.read(2), b"x")