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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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5
Lib/test/test_memoryio.py
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@ -32,7 +32,7 @@ class MemoryTestMixin:
self.assertEqual(f.seek(0), 0)
self.assertEqual(f.write(t("h")), 1)
self.assertEqual(f.truncate(12), 12)
self.assertEqual(f.tell(), 12)
self.assertEqual(f.tell(), 1)
def test_write(self):
buf = self.buftype("hello world\n")
@ -83,7 +83,8 @@ class MemoryTestMixin:
# truncate() accepts long objects
self.assertEqual(memio.truncate(4L), 4)
self.assertEqual(memio.getvalue(), buf[:4])
self.assertEqual(memio.tell(), 4)
self.assertEqual(memio.tell(), 6)
memio.seek(0, 2)
memio.write(buf)
self.assertEqual(memio.getvalue(), buf[:4] + buf)
pos = memio.tell()