Rename to _PyUnicode_AsUTF8NoNUL().

Include/internal/pycore_unicodeobject.h

@@ -436,7 +436,7 @@ extern void _PyUnicode_ClearInterned(PyInterpreterState *interp);
 
 // Like PyUnicode_AsUTF8(), but check for embedded null characters.
 // Export for '_sqlite3' shared extension.
-PyAPI_FUNC(const char *) _PyUnicode_AsUTF8(PyObject *);
+PyAPI_FUNC(const char *) _PyUnicode_AsUTF8NoNUL(PyObject *);
 
 
 #ifdef __cplusplus

Modules/_io/textio.c

@@ -1020,7 +1020,7 @@ io_check_errors(PyObject *errors)
         return 0;
     }
 
-    const char *name = _PyUnicode_AsUTF8(errors);
+    const char *name = _PyUnicode_AsUTF8NoNUL(errors);
     if (name == NULL) {
         return -1;
     }

Modules/_sqlite/connection.c

@@ -76,7 +76,7 @@ isolation_level_converter(PyObject *str_or_none, const char **result)
         *result = NULL;
     }
     else if (PyUnicode_Check(str_or_none)) {
-        const char *str = _PyUnicode_AsUTF8(str_or_none);
+        const char *str = _PyUnicode_AsUTF8NoNUL(str_or_none);
         if (str == NULL) {
             return 0;
         }

Objects/unicodeobject.c

@@ -3848,7 +3848,7 @@ PyUnicode_AsUTF8(PyObject *unicode)
 }
 
 const char *
-_PyUnicode_AsUTF8(PyObject *unicode)
+_PyUnicode_AsUTF8NoNUL(PyObject *unicode)
 {
     Py_ssize_t size;
     const char *s = PyUnicode_AsUTF8AndSize(unicode, &size);