allow more operations to work on detached streams (closes #23093)

Patch by Martin Panter.

2 files changed, 41 insertions, 39 deletions

diff --git a/Modules/_io/bufferedio.c b/Modules/_io/bufferedio.c
index 8084aae..02cf038 100644
--- a/Modules/_io/bufferedio.c
+++ b/Modules/_io/bufferedio.c
@@ -1359,7 +1359,7 @@ buffered_repr(buffered *self)
 
     nameobj = _PyObject_GetAttrId((PyObject *) self, &PyId_name);
     if (nameobj == NULL) {
-        if (PyErr_ExceptionMatches(PyExc_AttributeError))
+        if (PyErr_ExceptionMatches(PyExc_Exception))
             PyErr_Clear();
         else
             return NULL;
diff --git a/Modules/_io/textio.c b/Modules/_io/textio.c
index 4555bf7..3f01980 100644
--- a/Modules/_io/textio.c
+++ b/Modules/_io/textio.c
@@ -1219,25 +1219,27 @@ textiowrapper_closed_get(textio *self, void *context);
 
 #define CHECK_INITIALIZED(self) \
     if (self->ok <= 0) { \
-        if (self->detached) { \
-            PyErr_SetString(PyExc_ValueError, \
-                 "underlying buffer has been detached"); \
-        } else {                                   \
-            PyErr_SetString(PyExc_ValueError, \
-                "I/O operation on uninitialized object"); \
-        } \
+        PyErr_SetString(PyExc_ValueError, \
+            "I/O operation on uninitialized object"); \
+        return NULL; \
+    }
+
+#define CHECK_ATTACHED(self) \
+    CHECK_INITIALIZED(self); \
+    if (self->detached) { \
+        PyErr_SetString(PyExc_ValueError, \
+             "underlying buffer has been detached"); \
         return NULL; \
     }
 
-#define CHECK_INITIALIZED_INT(self) \
+#define CHECK_ATTACHED_INT(self) \
     if (self->ok <= 0) { \
-        if (self->detached) { \
-            PyErr_SetString(PyExc_ValueError, \
-                 "underlying buffer has been detached"); \
-        } else {                                   \
-            PyErr_SetString(PyExc_ValueError, \
-                "I/O operation on uninitialized object"); \
-        } \
+        PyErr_SetString(PyExc_ValueError, \
+            "I/O operation on uninitialized object"); \
+        return -1; \
+    } else if (self->detached) { \
+        PyErr_SetString(PyExc_ValueError, \
+             "underlying buffer has been detached"); \
         return -1; \
     }
 
@@ -1246,7 +1248,7 @@ static PyObject *
 textiowrapper_detach(textio *self)
 {
     PyObject *buffer, *res;
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
     res = PyObject_CallMethodObjArgs((PyObject *)self, _PyIO_str_flush, NULL);
     if (res == NULL)
         return NULL;
@@ -1254,7 +1256,6 @@ textiowrapper_detach(textio *self)
     buffer = self->buffer;
     self->buffer = NULL;
     self->detached = 1;
-    self->ok = 0;
     return buffer;
 }
 
@@ -1299,7 +1300,7 @@ textiowrapper_write(textio *self, PyObject *args)
     int haslf = 0;
     int needflush = 0, text_needflush = 0;
 
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
 
     if (!PyArg_ParseTuple(args, "U:write", &text)) {
         return NULL;
@@ -1556,7 +1557,7 @@ textiowrapper_read(textio *self, PyObject *args)
     Py_ssize_t n = -1;
     PyObject *result = NULL, *chunks = NULL;
 
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
 
     if (!PyArg_ParseTuple(args, "|O&:read", &_PyIO_ConvertSsize_t, &n))
         return NULL;
@@ -1931,7 +1932,7 @@ textiowrapper_readline(textio *self, PyObject *args)
 {
     Py_ssize_t limit = -1;
 
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
     if (!PyArg_ParseTuple(args, "|n:readline", &limit)) {
         return NULL;
     }
@@ -2069,7 +2070,7 @@ textiowrapper_seek(textio *self, PyObject *args)
     PyObject *res;
     int cmp;
 
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
 
     if (!PyArg_ParseTuple(args, "O|i:seek", &cookieObj, &whence))
         return NULL;
@@ -2249,7 +2250,7 @@ textiowrapper_tell(textio *self, PyObject *args)
     Py_ssize_t dec_buffer_len;
     int dec_flags;
 
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
     CHECK_CLOSED(self);
 
     if (!self->seekable) {
@@ -2452,7 +2453,7 @@ textiowrapper_truncate(textio *self, PyObject *args)
     PyObject *pos = Py_None;
     PyObject *res;
 
-    CHECK_INITIALIZED(self)
+    CHECK_ATTACHED(self)
     if (!PyArg_ParseTuple(args, "|O:truncate", &pos)) {
         return NULL;
     }
@@ -2475,9 +2476,10 @@ textiowrapper_repr(textio *self)
     res = PyUnicode_FromString("<_io.TextIOWrapper");
     if (res == NULL)
         return NULL;
+
     nameobj = _PyObject_GetAttrId((PyObject *) self, &PyId_name);
     if (nameobj == NULL) {
-        if (PyErr_ExceptionMatches(PyExc_AttributeError))
+        if (PyErr_ExceptionMatches(PyExc_Exception))
             PyErr_Clear();
         else
             goto error;
@@ -2493,7 +2495,7 @@ textiowrapper_repr(textio *self)
     }
     modeobj = _PyObject_GetAttrId((PyObject *) self, &PyId_mode);
     if (modeobj == NULL) {
-        if (PyErr_ExceptionMatches(PyExc_AttributeError))
+        if (PyErr_ExceptionMatches(PyExc_Exception))
             PyErr_Clear();
         else
             goto error;
@@ -2522,35 +2524,35 @@ error:
 static PyObject *
 textiowrapper_fileno(textio *self, PyObject *args)
 {
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
     return _PyObject_CallMethodId(self->buffer, &PyId_fileno, NULL);
 }
 
 static PyObject *
 textiowrapper_seekable(textio *self, PyObject *args)
 {
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
     return _PyObject_CallMethodId(self->buffer, &PyId_seekable, NULL);
 }
 
 static PyObject *
 textiowrapper_readable(textio *self, PyObject *args)
 {
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
     return _PyObject_CallMethodId(self->buffer, &PyId_readable, NULL);
 }
 
 static PyObject *
 textiowrapper_writable(textio *self, PyObject *args)
 {
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
     return _PyObject_CallMethodId(self->buffer, &PyId_writable, NULL);
 }
 
 static PyObject *
 textiowrapper_isatty(textio *self, PyObject *args)
 {
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
     return _PyObject_CallMethodId(self->buffer, &PyId_isatty, NULL);
 }
 
@@ -2565,7 +2567,7 @@ textiowrapper_getstate(textio *self, PyObject *args)
 static PyObject *
 textiowrapper_flush(textio *self, PyObject *args)
 {
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
     CHECK_CLOSED(self);
     self->telling = self->seekable;
     if (_textiowrapper_writeflush(self) < 0)
@@ -2578,7 +2580,7 @@ textiowrapper_close(textio *self, PyObject *args)
 {
     PyObject *res;
     int r;
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
 
     res = textiowrapper_closed_get(self, NULL);
     if (res == NULL)
@@ -2620,7 +2622,7 @@ textiowrapper_iternext(textio *self)
 {
     PyObject *line;
 
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
 
     self->telling = 0;
     if (Py_TYPE(self) == &PyTextIOWrapper_Type) {
@@ -2656,14 +2658,14 @@ textiowrapper_iternext(textio *self)
 static PyObject *
 textiowrapper_name_get(textio *self, void *context)
 {
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
     return _PyObject_GetAttrId(self->buffer, &PyId_name);
 }
 
 static PyObject *
 textiowrapper_closed_get(textio *self, void *context)
 {
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
     return PyObject_GetAttr(self->buffer, _PyIO_str_closed);
 }
 
@@ -2671,7 +2673,7 @@ static PyObject *
 textiowrapper_newlines_get(textio *self, void *context)
 {
     PyObject *res;
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
     if (self->decoder == NULL)
         Py_RETURN_NONE;
     res = PyObject_GetAttr(self->decoder, _PyIO_str_newlines);
@@ -2697,7 +2699,7 @@ textiowrapper_errors_get(textio *self, void *context)
 static PyObject *
 textiowrapper_chunk_size_get(textio *self, void *context)
 {
-    CHECK_INITIALIZED(self);
+    CHECK_ATTACHED(self);
     return PyLong_FromSsize_t(self->chunk_size);
 }
 
@@ -2705,7 +2707,7 @@ static int
 textiowrapper_chunk_size_set(textio *self, PyObject *arg, void *context)
 {
     Py_ssize_t n;
-    CHECK_INITIALIZED_INT(self);
+    CHECK_ATTACHED_INT(self);
     n = PyNumber_AsSsize_t(arg, PyExc_ValueError);
     if (n == -1 && PyErr_Occurred())
         return -1;