make StringIO like other file objects in that readline(-1) has no effect #7348
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@ -158,7 +158,7 @@ class StringIO:
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newpos = self.len
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else:
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newpos = i+1
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if length is not None:
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if length is not None and length > 0:
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if self.pos + length < newpos:
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newpos = self.pos + length
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r = self.buf[self.pos:newpos]
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@ -28,6 +28,8 @@ class TestGenericStringIO(unittest.TestCase):
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eq(self._fp.read(10), self._line[:10])
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eq(self._fp.readline(), self._line[10:] + '\n')
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eq(len(self._fp.readlines(60)), 2)
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self._fp.seek(0)
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eq(self._fp.readline(-1), self._line + '\n')
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def test_writes(self):
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f = self.MODULE.StringIO()
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