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/Modules/clinic/symtablemodule.c.h b/Modules/clinic/symtablemodule.c.h
index d624c22..2ecd3af 100644
--- a/Modules/clinic/symtablemodule.c.h
+++ b/Modules/clinic/symtablemodule.c.h
@@ -36,13 +36,18 @@ _symtable_symtable(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
         _PyArg_BadArgument("symtable", "argument 3", "str", args[2]);
         goto exit;
     }
-    startstr = PyUnicode_AsUTF8(args[2]);
+    Py_ssize_t startstr_length;
+    startstr = PyUnicode_AsUTF8AndSize(args[2], &startstr_length);
     if (startstr == NULL) {
         goto exit;
     }
+    if (strlen(startstr) != (size_t)startstr_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
+        goto exit;
+    }
     return_value = _symtable_symtable_impl(module, source, filename, startstr);
 
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=9af1ab5a114a1ec7 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=931964a76a72f850 input=a9049054013a1b77]*/