Marc-Andre Lemburg <mal@lemburg.com>:

New test for huge formatting strings (these could cause core
dumps in previous versions).

By Trent Mick.

diff --git a/Lib/test/test_format.py b/Lib/test/test_format.py
new file mode 100644 (file)
index 0000000..9be9c76
--- /dev/null
+++ b/Lib/test/test_format.py
@@ -0,0 +1,52 @@
+from test_support import verbose
+import string, sys
+
+# test string formatting operator (I am not sure if this is being tested
+# elsewhere but, surely, some of the given cases are *not* tested because
+# they crash python)
+# test on unicode strings as well
+
+def testformat(formatstr, args, output=None):
+       if verbose:
+               if output:
+                       print "%s %% %s =? %s ..." %\
+                               (repr(formatstr), repr(args), repr(output)),
+               else:
+                       print "%s %% %s works? ..." % (repr(formatstr), repr(args)),
+       try:
+               result = formatstr % args
+       except OverflowError:
+               if verbose:
+                       print 'overflow (this is fine)'
+       else:
+               if output and result != output:
+                       if verbose:
+                               print 'no'
+                       print "%s %% %s == %s != %s" %\
+                               (repr(formatstr), repr(args), repr(result), repr(output))
+               else:
+                       if verbose:
+                               print 'yes'
+
+def testboth(formatstr, *args):
+       testformat(formatstr, *args)
+       testformat(unicode(formatstr), *args)
+               
+
+testboth("%.1d", (1,), "1")
+testboth("%.*d", (sys.maxint,1))  # expect overflow
+testboth("%.100d", (1,), '0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001')
+testboth("%#.117x", (1,), '0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001')
+testboth("%#.118x", (1,), '0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001')
+
+testboth("%f", (1.0,), "1.000000")
+# these are trying to test the limits of the internal magic-number-length
+# formatting buffer, if that number changes then these tests are less
+# effective
+testboth("%#.*g", (109, -1.e+49/3.))
+testboth("%#.*g", (110, -1.e+49/3.))
+testboth("%#.*g", (110, -1.e+100/3.))
+
+# test some ridiculously large precision, expect overflow
+testboth('%12.*f', (123456, 1.0))
+