gh-66060: Use actual class name in _io type's __repr__ (#30824)

Use the object's actual class name in the following _io type's __repr__:
- FileIO
- TextIOWrapper
- _WindowsConsoleIO

3 files changed, 29 insertions, 20 deletions

diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index 8a73ea0..af4375c 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -1100,31 +1100,32 @@ static PyObject *
 fileio_repr(fileio *self)
 {
     PyObject *nameobj, *res;
+    const char *type_name = Py_TYPE((PyObject *) self)->tp_name;
 
-    if (self->fd < 0)
-        return PyUnicode_FromFormat("<_io.FileIO [closed]>");
+    if (self->fd < 0) {
+        return PyUnicode_FromFormat("<%.100s [closed]>", type_name);
+    }
 
     if (PyObject_GetOptionalAttr((PyObject *) self, &_Py_ID(name), &nameobj) < 0) {
         return NULL;
     }
     if (nameobj == NULL) {
         res = PyUnicode_FromFormat(
-            "<_io.FileIO fd=%d mode='%s' closefd=%s>",
-            self->fd, mode_string(self), self->closefd ? "True" : "False");
+            "<%.100s fd=%d mode='%s' closefd=%s>",
+            type_name, self->fd, mode_string(self), self->closefd ? "True" : "False");
     }
     else {
         int status = Py_ReprEnter((PyObject *)self);
         res = NULL;
         if (status == 0) {
             res = PyUnicode_FromFormat(
-                "<_io.FileIO name=%R mode='%s' closefd=%s>",
-                nameobj, mode_string(self), self->closefd ? "True" : "False");
+                "<%.100s name=%R mode='%s' closefd=%s>",
+                type_name, nameobj, mode_string(self), self->closefd ? "True" : "False");
             Py_ReprLeave((PyObject *)self);
         }
         else if (status > 0) {
             PyErr_Format(PyExc_RuntimeError,
-                         "reentrant call inside %s.__repr__",
-                         Py_TYPE(self)->tp_name);
+                         "reentrant call inside %.100s.__repr__", type_name);
         }
         Py_DECREF(nameobj);
     }
diff --git a/Modules/_io/textio.c b/Modules/_io/textio.c
index e93c3e0..d794af8 100644
--- a/Modules/_io/textio.c
+++ b/Modules/_io/textio.c
@@ -2948,10 +2948,11 @@ textiowrapper_repr(textio *self)
 {
     PyObject *nameobj, *modeobj, *res, *s;
     int status;
+    const char *type_name = Py_TYPE(self)->tp_name;
 
     CHECK_INITIALIZED(self);
 
-    res = PyUnicode_FromString("<_io.TextIOWrapper");
+    res = PyUnicode_FromFormat("<%.100s", type_name);
     if (res == NULL)
         return NULL;
 
@@ -2959,8 +2960,8 @@ textiowrapper_repr(textio *self)
     if (status != 0) {
         if (status > 0) {
             PyErr_Format(PyExc_RuntimeError,
-                         "reentrant call inside %s.__repr__",
-                         Py_TYPE(self)->tp_name);
+                         "reentrant call inside %.100s.__repr__",
+                         type_name);
         }
         goto error;
     }
diff --git a/Modules/_io/winconsoleio.c b/Modules/_io/winconsoleio.c
index 6680488..fecb338 100644
--- a/Modules/_io/winconsoleio.c
+++ b/Modules/_io/winconsoleio.c
@@ -1070,15 +1070,22 @@ _io__WindowsConsoleIO_write_impl(winconsoleio *self, PyTypeObject *cls,
 static PyObject *
 winconsoleio_repr(winconsoleio *self)
 {
-    if (self->fd == -1)
-        return PyUnicode_FromFormat("<_io._WindowsConsoleIO [closed]>");
-
-    if (self->readable)
-        return PyUnicode_FromFormat("<_io._WindowsConsoleIO mode='rb' closefd=%s>",
-            self->closefd ? "True" : "False");
-    if (self->writable)
-        return PyUnicode_FromFormat("<_io._WindowsConsoleIO mode='wb' closefd=%s>",
-            self->closefd ? "True" : "False");
+    const char *type_name = (Py_TYPE((PyObject *)self)->tp_name);
+
+    if (self->fd == -1) {
+        return PyUnicode_FromFormat("<%.100s [closed]>", type_name);
+    }
+
+    if (self->readable) {
+        return PyUnicode_FromFormat("<%.100s mode='rb' closefd=%s>",
+                                    type_name,
+                                    self->closefd ? "True" : "False");
+    }
+    if (self->writable) {
+        return PyUnicode_FromFormat("<%.100s mode='wb' closefd=%s>",
+                                    type_name,
+                                    self->closefd ? "True" : "False");
+    }
 
     PyErr_SetString(PyExc_SystemError, "_WindowsConsoleIO has invalid mode");
     return NULL;