Mercurial > cpython-lru_cache-weakref
diff Objects/bytesobject.c @ 52768:643f44ad387f
Optimize slicing of bytes and bytearray by avoiding useless copying.
This restores the behavior that was present in Python 2.x.
| author | Alexandre Vassalotti <alexandre@peadrop.com> |
|---|---|
| date | Fri, 03 Apr 2009 06:38:02 +0000 |
| parents | debd14c489b9 |
| children | 28096ed73153 |
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--- a/Objects/bytesobject.c Fri Apr 03 06:19:27 2009 +0000 +++ b/Objects/bytesobject.c Fri Apr 03 06:38:02 2009 +0000 @@ -951,19 +951,17 @@ slicelength); } else { - source_buf = PyBytes_AsString((PyObject*)self); - result_buf = (char *)PyMem_Malloc(slicelength); - if (result_buf == NULL) - return PyErr_NoMemory(); - + source_buf = PyBytes_AS_STRING(self); + result = PyBytes_FromStringAndSize(NULL, slicelength); + if (result == NULL) + return NULL; + + result_buf = PyBytes_AS_STRING(result); for (cur = start, i = 0; i < slicelength; cur += step, i++) { result_buf[i] = source_buf[cur]; } - result = PyBytes_FromStringAndSize(result_buf, - slicelength); - PyMem_Free(result_buf); return result; } }