7846: limit fnmatch pattern cache to _MAXCACHE=100 entries.
Patch by Andrew Clegg.
diff --git a/Lib/test/test_fnmatch.py b/Lib/test/test_fnmatch.py
index 6d2f9ad..81b9ce6 100644
--- a/Lib/test/test_fnmatch.py
+++ b/Lib/test/test_fnmatch.py
@@ -3,7 +3,7 @@
from test import support
import unittest
-from fnmatch import fnmatch, fnmatchcase
+from fnmatch import fnmatch, fnmatchcase, _MAXCACHE, _cache, _cacheb
class FnmatchTestCase(unittest.TestCase):
@@ -60,6 +60,21 @@
self.check_match(b'test\xff', b'te*\xff')
self.check_match(b'foo\nbar', b'foo*')
+ def test_cache_clearing(self):
+ # check that caches do not grow too large
+ # http://bugs.python.org/issue7846
+
+ # string pattern cache
+ for i in range(_MAXCACHE + 1):
+ fnmatch('foo', '?' * i)
+
+ self.assertLessEqual(len(_cache), _MAXCACHE)
+
+ # bytes pattern cache
+ for i in range(_MAXCACHE + 1):
+ fnmatch(b'foo', b'?' * i)
+ self.assertLessEqual(len(_cacheb), _MAXCACHE)
+
def test_main():
support.run_unittest(FnmatchTestCase)