New issue 2499: cpyext: PyString_AsString() doesn't work
https://bitbucket.org/pypy/pypy/issues/2499/cpyext-pystring_asstring-doesnt-work
Victor Stinner:
The following fuction returns '\x01\x02' on CPytohn, but '\x00\x00' on PyPy.
```
static PyObject *py_apply_delta(PyObject *self, PyObject *args)
{
uint8_t *out;
PyObject *ret;
ret = PyString_FromStringAndSize(NULL, 2);
if (ret == NULL) {
PyErr_NoMemory();
return NULL;
}
out = (uint8_t *)PyString_AsString(ret);
out[0] = 1;
out[1] = 2;
return ret;
}
```
If you replace PyString_AsString() with PyString_AS_STRING(), it works as
expected.
It seems like PyString_AS_STRING() behaves differently.
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