Use _PyUnicodeWriter API in str.format() internals

Objects/complexobject.c

 
 /* Complex object implementation */
 
 /* Borrows heavily from floatobject.c */
 
 /* Submitted by Jim Hugunin */
 
 #include "Python.h"
 #include "structmember.h"
 
@@ skipping 687 matching lines @@
 static PyObject *
 complex__format__(PyObject* self, PyObject* args)
 {
     PyObject *format_spec;
     _PyUnicodeWriter writer;
     int ret;
 
     if (!PyArg_ParseTuple(args, "U:__format__", &format_spec))
         return NULL;
 
-    if (_PyUnicodeWriter_init(&writer, 0, 0) == -1)
+    _PyUnicodeWriter_Init(&writer, 0);
+    ret = _PyComplex_FormatAdvancedWriter(
+        self,
+        format_spec, 0, PyUnicode_GET_LENGTH(format_spec),
+        &writer);
+    if (ret == -1) {
+        _PyUnicodeWriter_Dealloc(&writer);
         return NULL;
-    ret = _PyComplex_FormatWriter(self, format_spec, 0,
-                                  PyUnicode_GET_LENGTH(format_spec),
-                                  &writer);
-    if (ret == -1) {
-        _PyUnicodeWriter_dealloc(&writer);
-        return NULL;
-    }
-    return _PyUnicodeWriter_finish(&writer);
+    }
+    return _PyUnicodeWriter_Finish(&writer);
 }
 
 #if 0
 static PyObject *
 complex_is_finite(PyObject *self)
 {
     Py_complex c;
     c = ((PyComplexObject *)self)->cval;
     return PyBool_FromLong((long)(Py_IS_FINITE(c.real) &&
                                   Py_IS_FINITE(c.imag)));
@@ skipping 377 matching lines @@
     0,                                          /* tp_base */
     0,                                          /* tp_dict */
     0,                                          /* tp_descr_get */
     0,                                          /* tp_descr_set */
     0,                                          /* tp_dictoffset */
     0,                                          /* tp_init */
     PyType_GenericAlloc,                        /* tp_alloc */
     complex_new,                                /* tp_new */
     PyObject_Del,                               /* tp_free */
 };