[Python-checkins] r64070 - python/trunk/Modules/_ctypes/callproc.c
thomas.heller
python-checkins at python.org
Tue Jun 10 16:02:46 CEST 2008
Author: thomas.heller
Date: Tue Jun 10 16:02:46 2008
New Revision: 64070
Log:
Add an optional 'offset' parameter to byref, defaultingto zero.
Modified:
python/trunk/Modules/_ctypes/callproc.c
Modified: python/trunk/Modules/_ctypes/callproc.c
==============================================================================
--- python/trunk/Modules/_ctypes/callproc.c (original)
+++ python/trunk/Modules/_ctypes/callproc.c Tue Jun 10 16:02:46 2008
@@ -1561,7 +1561,7 @@
}
static char byref_doc[] =
-"byref(C instance) -> byref-object\n"
+"byref(C instance[, offset=0]) -> byref-object\n"
"Return a pointer lookalike to a C instance, only usable\n"
"as function argument";
@@ -1570,9 +1570,21 @@
* but still has a reference to self.
*/
static PyObject *
-byref(PyObject *self, PyObject *obj)
+byref(PyObject *self, PyObject *args)
{
PyCArgObject *parg;
+ PyObject *obj;
+ PyObject *pyoffset = NULL;
+ Py_ssize_t offset = 0;
+
+ if (!PyArg_UnpackTuple(args, "byref", 1, 2,
+ &obj, &pyoffset))
+ return NULL;
+ if (pyoffset) {
+ offset = PyNumber_AsSsize_t(pyoffset, NULL);
+ if (offset == -1 && PyErr_Occurred())
+ return NULL;
+ }
if (!CDataObject_Check(obj)) {
PyErr_Format(PyExc_TypeError,
"byref() argument must be a ctypes instance, not '%s'",
@@ -1588,7 +1600,7 @@
parg->pffi_type = &ffi_type_pointer;
Py_INCREF(obj);
parg->obj = obj;
- parg->value.p = ((CDataObject *)obj)->b_ptr;
+ parg->value.p = (char *)((CDataObject *)obj)->b_ptr + offset;
return (PyObject *)parg;
}
@@ -1876,7 +1888,7 @@
#endif
{"alignment", align_func, METH_O, alignment_doc},
{"sizeof", sizeof_func, METH_O, sizeof_doc},
- {"byref", byref, METH_O, byref_doc},
+ {"byref", byref, METH_VARARGS, byref_doc},
{"addressof", addressof, METH_O, addressof_doc},
{"call_function", call_function, METH_VARARGS },
{"call_cdeclfunction", call_cdeclfunction, METH_VARARGS },
More information about the Python-checkins
mailing list