gh-111089: Revert PyUnicode_AsUTF8() changes (#111833)

* Revert "gh-111089: Use PyUnicode_AsUTF8() in Argument Clinic (#111585)"

This reverts commit d9b606b3d04fc56fb0bcc479d7d6c14562edb5e2.

* Revert "gh-111089: Use PyUnicode_AsUTF8() in getargs.c (#111620)"

This reverts commit cde1071b2a72e8261ca66053ef61431b7f3a81fd.

* Revert "gh-111089: PyUnicode_AsUTF8() now raises on embedded NUL (#111091)"

This reverts commit d731579bfb9a497cfb0076cb6b221058a20088fe.

* Revert "gh-111089: Add PyUnicode_AsUTF8() to the limited C API (#111121)"

This reverts commit d8f32be5b6a736dc2fc9dca3f1bf176c82fc9b44.

* Revert "gh-111089: Use PyUnicode_AsUTF8() in sqlite3 (#111122)"

This reverts commit 37e4e20eaa8f27ada926d49e5971fecf0477ad26.

1 files changed, 7 insertions, 2 deletions

diff --git a/Python/clinic/Python-tokenize.c.h b/Python/clinic/Python-tokenize.c.h
index 7417020..730fa8e 100644
--- a/Python/clinic/Python-tokenize.c.h
+++ b/Python/clinic/Python-tokenize.c.h
@@ -65,14 +65,19 @@ tokenizeriter_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
         _PyArg_BadArgument("tokenizeriter", "argument 'encoding'", "str", fastargs[2]);
         goto exit;
     }
-    encoding = PyUnicode_AsUTF8(fastargs[2]);
+    Py_ssize_t encoding_length;
+    encoding = PyUnicode_AsUTF8AndSize(fastargs[2], &encoding_length);
     if (encoding == NULL) {
         goto exit;
     }
+    if (strlen(encoding) != (size_t)encoding_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
+        goto exit;
+    }
 skip_optional_kwonly:
     return_value = tokenizeriter_new_impl(type, readline, extra_tokens, encoding);
 
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=92cb8176149f0924 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=dcd6ec48f06a092e input=a9049054013a1b77]*/