return NULL;					}					outlen = need;				}				memcpy(					PyString_AS_STRING(result) + j,					PyString_AS_STRING(item),					reslen				);				j += reslen;			}		}		Py_DECREF(item);	} 	if (j < outlen)		_PyString_Resize(&result, j); 	return result; Fail_1:	Py_DECREF(result);	return NULL;} #ifdef Py_USING_UNICODE/* Helper for filter(): filter a Unicode object through a function */ static PyObject *filterunicode(PyObject *func, PyObject *strobj){	PyObject *result;	register Py_ssize_t i, j;	Py_ssize_t len = PyUnicode_GetSize(strobj);	Py_ssize_t outlen = len; 	if (func == Py_None) {		/* If it's a real string we can return the original,		 * as no character is ever false and __getitem__		 * does return this character. If it's a subclass		 * we must go through the __getitem__ loop */		if (PyUnicode_CheckExact(strobj)) {			Py_INCREF(strobj);			return strobj;		}	}	if ((result = PyUnicode_FromUnicode(NULL, len)) == NULL)		return NULL; 	for (i = j = 0; i < len; ++i) {		PyObject *item, *arg, *good;		int ok; 		item = (*strobj->ob_type->tp_as_sequence->sq_item)(strobj, i);		if (item == NULL)			goto Fail_1;		if (func == Py_None) {			ok = 1;		} else {			arg = PyTuple_Pack(1, item);			if (arg == NULL) {				Py_DECREF(item);				goto Fail_1;			}			good = PyEval_CallObject(func, arg);			Py_DECREF(arg);			if (good == NULL) {				Py_DECREF(item);				goto Fail_1;			}			ok = PyObject_IsTrue(good);			Py_DECREF(good);		}		if (ok) {			Py_ssize_t reslen;			if (!PyUnicode_Check(item)) {				PyErr_SetString(PyExc_TypeError,				"can't filter unicode to unicode:"				" __getitem__ returned different type");				Py_DECREF(item);				goto Fail_1;			}			reslen = PyUnicode_GET_SIZE(item);			if (reslen == 1)				PyUnicode_AS_UNICODE(result)[j++] =					PyUnicode_AS_UNICODE(item)[0];			else {				/* do we need more space? */				Py_ssize_t need = j + reslen + len - i - 1;				if (need > outlen) {					/* overallocate,					   to avoid reallocations */					if (need < 2 * outlen)						need = 2 * outlen;					if (PyUnicode_Resize(						&result, need) < 0) {						Py_DECREF(item);						goto Fail_1;					}					outlen = need;				}				memcpy(PyUnicode_AS_UNICODE(result) + j,				       PyUnicode_AS_UNICODE(item),				       reslen*sizeof(Py_UNICODE));				j += reslen;			}		}		Py_DECREF(item);	} 	if (j < outlen)		PyUnicode_Resize(&result, j); 	return result; Fail_1:	Py_DECREF(result);	return NULL;}#endif

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