[Python-Dev] [Python-checkins] cpython (3.1): disallow a negative idx parameter

[Zachary Ware]

On Mon, Apr 14, 2014 at 10:52 AM, benjamin.peterson
<python-checkins at python.org> wrote:
> http://hg.python.org/cpython/rev/4bd1fb0f4f44
> changeset:   90256:4bd1fb0f4f44
> branch:      3.1
> parent:      90235:a8facac493ef
> user:        Benjamin Peterson <benjamin at python.org>
> date:        Mon Apr 14 11:45:21 2014 -0400
> summary:
>   disallow a negative idx parameter
>
> files:
>   Modules/_json.c |  9 +++++----
>   1 files changed, 5 insertions(+), 4 deletions(-)
>
>
> diff --git a/Modules/_json.c b/Modules/_json.c
> --- a/Modules/_json.c
> +++ b/Modules/_json.c
> @@ -902,10 +902,11 @@
>      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 canont be negative");

s/canont/cannot/

Also in the comparable 3.2 commit, but not the 3.3+ merge.

Regards,
-- 
Zach