gh-91102: Use Argument Clinic for EncodingMap (#31725)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

Author: arhadthedev

Misc/NEWS.d/next/Core and Builtins/2022-04-18-07-23-48.gh-issue-91102.vm-6g1.rst

@@ -0,0 +1 @@
+Use Argument Clinic for :class:`EncodingMap`.  Patch by Oleg Iarygin.

Objects/clinic/unicodeobject.c.h

@@ -397,6 +397,7 @@ static const unsigned char ascii_linebreak[] = {
 
 static int convert_uc(PyObject *obj, void *addr);
 
+struct encoding_map;
 #include "clinic/unicodeobject.c.h"
 
 _Py_error_handler
@@ -8331,69 +8332,44 @@ PyUnicode_DecodeCharmap(const char *s,
 
 /* Charmap encoding: the lookup table */
 
+/*[clinic input]
+class EncodingMap "struct encoding_map *" "&EncodingMapType"
+[clinic start generated code]*/
+/*[clinic end generated code: output=da39a3ee5e6b4b0d input=14e46bbb6c522d22]*/
+
 struct encoding_map {
     PyObject_HEAD
     unsigned char level1[32];
     int count2, count3;
     unsigned char level23[1];
 };
 
-static PyObject*
-encoding_map_size(PyObject *obj, PyObject* args)
+/*[clinic input]
+EncodingMap.size
+
+Return the size (in bytes) of this object.
+[clinic start generated code]*/
+
+static PyObject *
+EncodingMap_size_impl(struct encoding_map *self)
+/*[clinic end generated code: output=c4c969e4c99342a4 input=004ff13f26bb5366]*/
 {
-    struct encoding_map *map = (struct encoding_map*)obj;
-    return PyLong_FromLong(sizeof(*map) - 1 + 16*map->count2 +
-                           128*map->count3);
+    return PyLong_FromLong((sizeof(*self) - 1) + 16*self->count2 +
+                           128*self->count3);
 }
 
 static PyMethodDef encoding_map_methods[] = {
-    {"size", encoding_map_size, METH_NOARGS,
-     PyDoc_STR("Return the size (in bytes) of this object") },
-    { 0 }
+    ENCODINGMAP_SIZE_METHODDEF
+    {NULL, NULL}
 };
 
 static PyTypeObject EncodingMapType = {
     PyVarObject_HEAD_INIT(NULL, 0)
-    "EncodingMap",          /*tp_name*/
-    sizeof(struct encoding_map),   /*tp_basicsize*/
-    0,                      /*tp_itemsize*/
+    .tp_name = "EncodingMap",
+    .tp_basicsize = sizeof(struct encoding_map),
     /* methods */
-    0,                      /*tp_dealloc*/
-    0,                      /*tp_vectorcall_offset*/
-    0,                      /*tp_getattr*/
-    0,                      /*tp_setattr*/
-    0,                      /*tp_as_async*/
-    0,                      /*tp_repr*/
-    0,                      /*tp_as_number*/
-    0,                      /*tp_as_sequence*/
-    0,                      /*tp_as_mapping*/
-    0,                      /*tp_hash*/
-    0,                      /*tp_call*/
-    0,                      /*tp_str*/
-    0,                      /*tp_getattro*/
-    0,                      /*tp_setattro*/
-    0,                      /*tp_as_buffer*/
-    Py_TPFLAGS_DEFAULT,     /*tp_flags*/
-    0,                      /*tp_doc*/
-    0,                      /*tp_traverse*/
-    0,                      /*tp_clear*/
-    0,                      /*tp_richcompare*/
-    0,                      /*tp_weaklistoffset*/
-    0,                      /*tp_iter*/
-    0,                      /*tp_iternext*/
-    encoding_map_methods,   /*tp_methods*/
-    0,                      /*tp_members*/
-    0,                      /*tp_getset*/
-    0,                      /*tp_base*/
-    0,                      /*tp_dict*/
-    0,                      /*tp_descr_get*/
-    0,                      /*tp_descr_set*/
-    0,                      /*tp_dictoffset*/
-    0,                      /*tp_init*/
-    0,                      /*tp_alloc*/
-    0,                      /*tp_new*/
-    0,                      /*tp_free*/
-    0,                      /*tp_is_gc*/
+    .tp_flags = Py_TPFLAGS_DEFAULT,
+    .tp_methods = encoding_map_methods,
 };
 
 PyObject*