disallow a negative idx parameter
diff --git a/Modules/_json.c b/Modules/_json.c
index 56d9ee4..c913409 100644
--- a/Modules/_json.c
+++ b/Modules/_json.c
@@ -1468,10 +1468,11 @@
PyObject *res;
char *str = PyString_AS_STRING(pystr);
Py_ssize_t length = PyString_GET_SIZE(pystr);
- if (idx < 0)
- /* Compatibility with the Python version. */
- idx += length;
- if (idx < 0 || idx >= length) {
+ if (idx < 0) {
+ PyErr_SetString(PyExc_ValueError, "idx cannot be negative");
+ return NULL;
+ }
+ if (idx >= length) {
PyErr_SetNone(PyExc_StopIteration);
return NULL;
}
@@ -1558,10 +1559,11 @@
PyObject *res;
Py_UNICODE *str = PyUnicode_AS_UNICODE(pystr);
Py_ssize_t length = PyUnicode_GET_SIZE(pystr);
- if (idx < 0)
- /* Compatibility with Python version. */
- idx += length;
- if (idx < 0 || idx >= length) {
+ if (idx < 0) {
+ PyErr_SetString(PyExc_ValueError, "idx cannot be negative");
+ return NULL;
+ }
+ if (idx >= length) {
PyErr_SetNone(PyExc_StopIteration);
return NULL;
}