Merged revisions 73698 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r73698 | amaury.forgeotdarc | 2009-06-30 00:36:49 +0200 (mar., 30 juin 2009) | 7 lines

  #6373: SystemError in str.encode('latin1', 'surrogateescape')
  if the string contains unpaired surrogates.
  (In debug build, crash in assert())

  This can happen with normal processing, if python starts with utf-8,
  then calls sys.setfilesystemencoding('latin-1')
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diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 0d4a3dd..305289b 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -4201,10 +4201,12 @@
                     repsize = PyBytes_Size(repunicode);
                     if (repsize > 1) {
                         /* Make room for all additional bytes. */
+                        respos = str - PyBytes_AS_STRING(res);
                         if (_PyBytes_Resize(&res, ressize+repsize-1)) {
                             Py_DECREF(repunicode);
                             goto onError;
                         }
+                        str = PyBytes_AS_STRING(res) + respos;
                         ressize += repsize-1;
                     }
                     memcpy(str, PyBytes_AsString(repunicode), repsize);