Make PyUnicode_Copy() private => _PyUnicode_Copy()

Undocument the function.

Make also decode_utf8_errors() as private (static).

Doc/c-api/unicode.rst

@@ -386,13 +386,6 @@ APIs:
    .. versionadded:: 3.3
 
 
-.. c:function:: PyObject* PyUnicode_Copy(PyObject *unicode)
-
-   Get a new copy of a Unicode object.
-
-   .. versionadded:: 3.3
-
-
 .. c:function:: PyObject* PyUnicode_FromKindAndData(int kind, const void *buffer, \
                                                     Py_ssize_t size)
 

Doc/whatsnew/3.3.rst

@@ -769,8 +769,8 @@ Unicode functions and methods using :c:type:`Py_UNICODE` and
  * :c:macro:`PyUnicode_GET_DATA_SIZE`: use
    ``PyUnicode_GET_LENGTH(str) * PyUnicode_KIND(str)`` (only work on ready
    strings)
- * :c:func:`PyUnicode_AsUnicodeCopy`: use :c:func:`PyUnicode_AsUCS4Copy`,
-   :c:func:`PyUnicode_AsWideCharString` or :c:func:`PyUnicode_Copy`
+ * :c:func:`PyUnicode_AsUnicodeCopy`: use :c:func:`PyUnicode_AsUCS4Copy` or
+   :c:func:`PyUnicode_AsWideCharString`
 
 Functions and macros manipulating Py_UNICODE* strings:
 

Include/unicodeobject.h

@@ -616,9 +616,11 @@ PyAPI_FUNC(int) _PyUnicode_Ready(
 #endif
 
 /* Get a copy of a Unicode string. */
-PyAPI_FUNC(PyObject*) PyUnicode_Copy(
+#ifndef Py_LIMITED_API
+PyAPI_FUNC(PyObject*) _PyUnicode_Copy(
     PyObject *unicode
     );
+#endif
 
 /* Copy character from one unicode object into another, this function performs
    character conversion when necessary and falls back to memcpy if possible.

Objects/codeobject.c

@@ -249,7 +249,7 @@ validate_and_copy_tuple(PyObject *tup)
             return NULL;
         }
         else {
-            item = PyUnicode_Copy(item);
+            item = _PyUnicode_Copy(item);
             if (item == NULL) {
                 Py_DECREF(newtuple);
                 return NULL;

Objects/unicodeobject.c

@@ -497,7 +497,7 @@ unicode_result_unchanged(PyObject *unicode)
     }
     else
         /* Subtype -- return genuine unicode string with the same value. */
-        return PyUnicode_Copy(unicode);
+        return _PyUnicode_Copy(unicode);
 }
 
 #ifdef HAVE_MBCS
@@ -1961,7 +1961,7 @@ unicode_adjust_maxchar(PyObject **p_unicode)
 }
 
 PyObject*
-PyUnicode_Copy(PyObject *unicode)
+_PyUnicode_Copy(PyObject *unicode)
 {
     Py_ssize_t length;
     PyObject *copy;
@@ -2832,7 +2832,7 @@ PyUnicode_FromObject(register PyObject *obj)
     if (PyUnicode_Check(obj)) {
         /* For a Unicode subtype that's not a Unicode object,
            return a true Unicode object with the same data. */
-        return PyUnicode_Copy(obj);
+        return _PyUnicode_Copy(obj);
     }
     PyErr_Format(PyExc_TypeError,
                  "Can't convert '%.100s' object to str implicitly",
@@ -4333,7 +4333,7 @@ _ucs4loop:
             goto onError;                                           \
     } while (0)
 
-PyObject *
+static PyObject *
 decode_utf8_errors(const char *starts,
                    Py_ssize_t size,
                    const char *errors,
@@ -9231,7 +9231,7 @@ fixup(PyObject *self,
     Py_UCS4 maxchar_old, maxchar_new = 0;
     PyObject *v;
 
-    u = PyUnicode_Copy(self);
+    u = _PyUnicode_Copy(self);
     if (u == NULL)
         return NULL;
     maxchar_old = PyUnicode_MAX_CHAR_VALUE(u);
@@ -12753,7 +12753,7 @@ PyDoc_STRVAR(sizeof__doc__,
 static PyObject *
 unicode_getnewargs(PyObject *v)
 {
-    PyObject *copy = PyUnicode_Copy(v);
+    PyObject *copy = _PyUnicode_Copy(v);
     if (!copy)
         return NULL;
     return Py_BuildValue("(N)", copy);