From 960b91351d070f0a560253d0a26a7749dff9c258 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Wed, 14 Oct 2026 14:52:44 +0200
Subject: [PATCH] Set default arguments in _testlimitedcapi/unicode.c
 (GH-159380)

Some optional arguments had no default value leading to undefined
behavior if they were omitted.
(cherry picked from commit e96d943d7df89e1f082e890ea668da95c77c177a)

Co-authored-by: Victor Stinner <vstinner@python.org>
---
 Modules/_testlimitedcapi/unicode.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/Modules/_testlimitedcapi/unicode.c b/Modules/_testlimitedcapi/unicode.c
index c7a23d5d1cbd71..c3a252be404062 100644
--- a/Modules/_testlimitedcapi/unicode.c
+++ b/Modules/_testlimitedcapi/unicode.c
@@ -944,7 +944,7 @@ unicode_encodecodepage(PyObject *self, PyObject *args)
 {
     int code_page;
     PyObject *unicode;
-    const char *errors;
+    const char *errors = NULL;
 
     if (!PyArg_ParseTuple(args, "iO|z", &code_page, &unicode, &errors))
         return NULL;
@@ -961,7 +961,7 @@ unicode_decodelocaleandsize(PyObject *self, PyObject *args)
 {
     const char *data;
     Py_ssize_t size;
-    const char *errors;
+    const char *errors = NULL;
 
     if (!PyArg_ParseTuple(args, "y#|z", &data, &size, &errors))
         return NULL;
@@ -975,7 +975,7 @@ unicode_decodelocale(PyObject *self, PyObject *args)
 {
     const char *data;
     Py_ssize_t size;
-    const char *errors;
+    const char *errors = NULL;
 
     if (!PyArg_ParseTuple(args, "y#|z", &data, &size, &errors))
         return NULL;
@@ -988,7 +988,7 @@ static PyObject *
 unicode_encodelocale(PyObject *self, PyObject *args)
 {
     PyObject *unicode;
-    const char *errors;
+    const char *errors = NULL;
 
     if (!PyArg_ParseTuple(args, "O|z", &unicode, &errors))
         return NULL;
@@ -1282,7 +1282,7 @@ unicode_comparewithasciistring(PyObject *self, PyObject *args)
 {
     PyObject *left;
     const char *right = NULL;
-    Py_ssize_t right_len;
+    Py_ssize_t right_len = 0;
     int result;
 
     if (!PyArg_ParseTuple(args, "O|y#", &left, &right, &right_len))
@@ -1321,7 +1321,7 @@ unicode_equaltoutf8andsize(PyObject *self, PyObject *args)
 {
     PyObject *left;
     const char *right = NULL;
-    Py_ssize_t right_len;
+    Py_ssize_t right_len = 0;
     Py_ssize_t size = -100;
     int result;