#6077: on Windows, fix truncation of a tempfile.TemporaryFile opened in "wt+" mode:
files opened with os.open() stop on the first \x1a (Ctrl-Z) unless os.O_BINARY is used.
Will backport to 3.1
diff --git a/Lib/test/test_tempfile.py b/Lib/test/test_tempfile.py
index a1bafc2..403dd93 100644
--- a/Lib/test/test_tempfile.py
+++ b/Lib/test/test_tempfile.py
@@ -309,8 +309,12 @@
if not has_textmode:
return # ugh, can't use SkipTest.
- self.do_create(bin=0).write(b"blat\n")
- # XXX should test that the file really is a text file
+ # A text file is truncated at the first Ctrl+Z byte
+ f = self.do_create(bin=0)
+ f.write(b"blat\x1a")
+ f.write(b"extra\n")
+ os.lseek(f.fd, 0, os.SEEK_SET)
+ self.assertEquals(os.read(f.fd, 20), b"blat")
test_classes.append(test__mkstemp_inner)
@@ -761,6 +765,10 @@
f.write("xyzzy\n")
f.seek(0)
self.assertEqual(f.read(), "abc\ndef\nxyzzy\n")
+ # Check that Ctrl+Z doesn't truncate the file
+ f.write("foo\x1abar\n")
+ f.seek(0)
+ self.assertEqual(f.read(), "abc\ndef\nxyzzy\nfoo\x1abar\n")
def test_text_newline_and_encoding(self):
f = tempfile.SpooledTemporaryFile(mode='w+', max_size=10,