Author: Ronan Lamy <ronan.l...@gmail.com>
Branch: py3.5
Changeset: r93236:981544a8f028
Date: 2017-12-02 03:12 +0000
http://bitbucket.org/pypy/pypy/changeset/981544a8f028/
Log: fix: StringIO.seek() may set the position beyond the end of the
buffer
diff --git a/pypy/module/_io/interp_stringio.py
b/pypy/module/_io/interp_stringio.py
--- a/pypy/module/_io/interp_stringio.py
+++ b/pypy/module/_io/interp_stringio.py
@@ -35,7 +35,8 @@
def _convert_limit(self, limit):
if limit < 0 or limit > len(self.data) - self.pos:
limit = len(self.data) - self.pos
- assert limit >= 0
+ if limit < 0: # happens when self.pos > len(self.data)
+ limit = 0
return limit
def readline_universal(self, limit):
diff --git a/pypy/module/_io/test/test_stringio.py
b/pypy/module/_io/test/test_stringio.py
--- a/pypy/module/_io/test/test_stringio.py
+++ b/pypy/module/_io/test/test_stringio.py
@@ -259,6 +259,8 @@
assert line == s
i += 1
assert i == 10
+ sio.seek(len(s) * 10 +1)
+ assert list(sio) == []
sio = io.StringIO(s * 2)
sio.close()
raises(ValueError, next, sio)
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