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Added new private API function _PyLong_NumBits. This will be used at the

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start for the C implemention of new pickle LONG1 and LONG4 opcodes (the
linear-time way to pickle a long is to call _PyLong_AsByteArray, but
the caller has no idea how big an array to allocate, and correct
calculation is a bit subtle).
This commit is contained in:
Tim Peters 2003-01-28 20:37:45 +00:00
parent 3d8c01b31c
commit baefd9e552
3 changed files with 85 additions and 2 deletions
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41
Modules/_testcapimodule.c
View file

@ -36,7 +36,7 @@ sizeof_error(const char* fatname, const char* typename,
int expected, int got)
{
char buf[1024];
PyOS_snprintf(buf, sizeof(buf),
PyOS_snprintf(buf, sizeof(buf),
"%.200s #define == %d but sizeof(%.200s) == %d",
fatname, expected, typename, got);
PyErr_SetString(TestError, buf);
@ -326,7 +326,7 @@ test_u_code(PyObject *self)
len != PyUnicode_GET_SIZE(obj))
return raiseTestError("test_u_code",
"u# code returned wrong values for u'test'");
Py_DECREF(tuple);
Py_INCREF(Py_None);
return Py_None;
@ -334,6 +334,42 @@ test_u_code(PyObject *self)
#endif
/* Simple test of _PyLong_NumBits. */
static PyObject *
test_long_numbits(PyObject *self)
{
struct pair {
long input;
size_t output;
} testcases[] = {{0, 1},
{1L, 2},
{-1L, 2},
{2L, 3},
{-2L, 3},
{3L, 3},
{-3L, 3},
{4L, 4},
{-4L, 4},
{0x7fffL, 16}, /* one Python long digit */
{-0x7fffL, 16},
{0xfffffffL, 29},
{-0xfffffffL, 29}};
int i;
for (i = 0; i < sizeof(testcases) / sizeof(struct pair); ++i) {
long input = testcases[i].input;
PyObject *plong = PyLong_FromLong(input);
size_t nbits = _PyLong_NumBits(plong);
Py_DECREF(plong);
if (nbits != testcases[i].output)
return raiseTestError("test_long_numbits",
"wrong result");
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
raise_exception(PyObject *self, PyObject *args)
{
@ -366,6 +402,7 @@ static PyMethodDef TestMethods[] = {
{"test_list_api", (PyCFunction)test_list_api, METH_NOARGS},
{"test_dict_iteration", (PyCFunction)test_dict_iteration,METH_NOARGS},
{"test_long_api", (PyCFunction)test_long_api, METH_NOARGS},
{"test_long_numbits", (PyCFunction)test_long_numbits, METH_NOARGS},
#ifdef HAVE_LONG_LONG
{"test_longlong_api", (PyCFunction)test_longlong_api, METH_NOARGS},
{"test_L_code", (PyCFunction)test_L_code, METH_NOARGS},