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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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8
Lib/io.py
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@ -880,7 +880,7 @@ class _BytesIO(BufferedIOBase):
elif pos < 0:
raise ValueError("negative truncate position %r" % (pos,))
del self._buffer[pos:]
return self.seek(pos)
return pos
def readable(self):
return True
@ -1215,8 +1215,7 @@ class BufferedRandom(BufferedWriter, BufferedReader):
if pos is None:
pos = self.tell()
# Use seek to flush the read buffer.
self.seek(pos)
return BufferedWriter.truncate(self)
return BufferedWriter.truncate(self, pos)
def read(self, n=None):
if n is None:
@ -1667,8 +1666,7 @@ class TextIOWrapper(TextIOBase):
self.flush()
if pos is None:
pos = self.tell()
self.seek(pos)
return self.buffer.truncate()
return self.buffer.truncate(pos)
def seek(self, cookie, whence=0):
if self.closed: