bpo-20047: Make bytearray methods partition() and rpartition() rejecting (#4158)

separators that are not bytes-like objects.

6 files changed, 51 insertions, 28 deletions

diff --git a/Objects/bytearrayobject.c b/Objects/bytearrayobject.c
index 840d5b0..c92cfc0 100644
--- a/Objects/bytearrayobject.c
+++ b/Objects/bytearrayobject.c
@@ -104,6 +104,26 @@ PyByteArray_FromObject(PyObject *input)
                                         input, NULL);
 }
 
+static PyObject *
+_PyByteArray_FromBufferObject(PyObject *obj)
+{
+    PyObject *result;
+    Py_buffer view;
+
+    if (PyObject_GetBuffer(obj, &view, PyBUF_FULL_RO) < 0) {
+        return NULL;
+    }
+    result = PyByteArray_FromStringAndSize(NULL, view.len);
+    if (result != NULL &&
+        PyBuffer_ToContiguous(PyByteArray_AS_STRING(result),
+                              &view, view.len, 'C') < 0)
+    {
+        Py_CLEAR(result);
+    }
+    PyBuffer_Release(&view);
+    return result;
+}
+
 PyObject *
 PyByteArray_FromStringAndSize(const char *bytes, Py_ssize_t size)
 {
@@ -536,7 +556,8 @@ bytearray_setslice(PyByteArrayObject *self, Py_ssize_t lo, Py_ssize_t hi,
     if (values == (PyObject *)self) {
         /* Make a copy and call this function recursively */
         int err;
-        values = PyByteArray_FromObject(values);
+        values = PyByteArray_FromStringAndSize(PyByteArray_AS_STRING(values),
+                                               PyByteArray_GET_SIZE(values));
         if (values == NULL)
             return -1;
         err = bytearray_setslice(self, lo, hi, values);
@@ -1387,19 +1408,19 @@ Partition the bytearray into three parts using the given separator.
 
 This will search for the separator sep in the bytearray. If the separator is
 found, returns a 3-tuple containing the part before the separator, the
-separator itself, and the part after it.
+separator itself, and the part after it as new bytearray objects.
 
-If the separator is not found, returns a 3-tuple containing the original
-bytearray object and two empty bytearray objects.
+If the separator is not found, returns a 3-tuple containing the copy of the
+original bytearray object and two empty bytearray objects.
 [clinic start generated code]*/
 
 static PyObject *
 bytearray_partition(PyByteArrayObject *self, PyObject *sep)
-/*[clinic end generated code: output=45d2525ddd35f957 input=86f89223892b70b5]*/
+/*[clinic end generated code: output=45d2525ddd35f957 input=8f644749ee4fc83a]*/
 {
     PyObject *bytesep, *result;
 
-    bytesep = PyByteArray_FromObject(sep);
+    bytesep = _PyByteArray_FromBufferObject(sep);
     if (! bytesep)
         return NULL;
 
@@ -1420,23 +1441,24 @@ bytearray.rpartition
     sep: object
     /
 
-Partition the bytes into three parts using the given separator.
+Partition the bytearray into three parts using the given separator.
 
-This will search for the separator sep in the bytearray, starting and the end.
+This will search for the separator sep in the bytearray, starting at the end.
 If the separator is found, returns a 3-tuple containing the part before the
-separator, the separator itself, and the part after it.
+separator, the separator itself, and the part after it as new bytearray
+objects.
 
 If the separator is not found, returns a 3-tuple containing two empty bytearray
-objects and the original bytearray object.
+objects and the copy of the original bytearray object.
 [clinic start generated code]*/
 
 static PyObject *
 bytearray_rpartition(PyByteArrayObject *self, PyObject *sep)
-/*[clinic end generated code: output=440de3c9426115e8 input=5f4094f2de87c8f3]*/
+/*[clinic end generated code: output=440de3c9426115e8 input=7e3df3e6cb8fa0ac]*/
 {
     PyObject *bytesep, *result;
 
-    bytesep = PyByteArray_FromObject(sep);
+    bytesep = _PyByteArray_FromBufferObject(sep);
     if (! bytesep)
         return NULL;
 
diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c
index 48b6501..7ba90aa 100644
--- a/Objects/bytesobject.c
+++ b/Objects/bytesobject.c
@@ -1834,7 +1834,7 @@ bytes.rpartition
 
 Partition the bytes into three parts using the given separator.
 
-This will search for the separator sep in the bytes, starting and the end. If
+This will search for the separator sep in the bytes, starting at the end. If
 the separator is found, returns a 3-tuple containing the part before the
 separator, the separator itself, and the part after it.
 
@@ -1844,7 +1844,7 @@ objects and the original bytes object.
 
 static PyObject *
 bytes_rpartition_impl(PyBytesObject *self, Py_buffer *sep)
-/*[clinic end generated code: output=191b114cbb028e50 input=67f689e63a62d478]*/
+/*[clinic end generated code: output=191b114cbb028e50 input=d78db010c8cfdbe1]*/
 {
     return stringlib_rpartition(
         (PyObject*) self,
diff --git a/Objects/clinic/bytearrayobject.c.h b/Objects/clinic/bytearrayobject.c.h
index 319c86e..d45592b 100644
--- a/Objects/clinic/bytearrayobject.c.h
+++ b/Objects/clinic/bytearrayobject.c.h
@@ -214,10 +214,10 @@ PyDoc_STRVAR(bytearray_partition__doc__,
 "\n"
 "This will search for the separator sep in the bytearray. If the separator is\n"
 "found, returns a 3-tuple containing the part before the separator, the\n"
-"separator itself, and the part after it.\n"
+"separator itself, and the part after it as new bytearray objects.\n"
 "\n"
-"If the separator is not found, returns a 3-tuple containing the original\n"
-"bytearray object and two empty bytearray objects.");
+"If the separator is not found, returns a 3-tuple containing the copy of the\n"
+"original bytearray object and two empty bytearray objects.");
 
 #define BYTEARRAY_PARTITION_METHODDEF    \
     {"partition", (PyCFunction)bytearray_partition, METH_O, bytearray_partition__doc__},
@@ -226,14 +226,15 @@ PyDoc_STRVAR(bytearray_rpartition__doc__,
 "rpartition($self, sep, /)\n"
 "--\n"
 "\n"
-"Partition the bytes into three parts using the given separator.\n"
+"Partition the bytearray into three parts using the given separator.\n"
 "\n"
-"This will search for the separator sep in the bytearray, starting and the end.\n"
+"This will search for the separator sep in the bytearray, starting at the end.\n"
 "If the separator is found, returns a 3-tuple containing the part before the\n"
-"separator, the separator itself, and the part after it.\n"
+"separator, the separator itself, and the part after it as new bytearray\n"
+"objects.\n"
 "\n"
 "If the separator is not found, returns a 3-tuple containing two empty bytearray\n"
-"objects and the original bytearray object.");
+"objects and the copy of the original bytearray object.");
 
 #define BYTEARRAY_RPARTITION_METHODDEF    \
     {"rpartition", (PyCFunction)bytearray_rpartition, METH_O, bytearray_rpartition__doc__},
@@ -711,4 +712,4 @@ bytearray_sizeof(PyByteArrayObject *self, PyObject *Py_UNUSED(ignored))
 {
     return bytearray_sizeof_impl(self);
 }
-/*[clinic end generated code: output=e53f10084457a46b input=a9049054013a1b77]*/
+/*[clinic end generated code: output=c2804d009182328c input=a9049054013a1b77]*/
diff --git a/Objects/clinic/bytesobject.c.h b/Objects/clinic/bytesobject.c.h
index 315f6f2..9c358b5 100644
--- a/Objects/clinic/bytesobject.c.h
+++ b/Objects/clinic/bytesobject.c.h
@@ -86,7 +86,7 @@ PyDoc_STRVAR(bytes_rpartition__doc__,
 "\n"
 "Partition the bytes into three parts using the given separator.\n"
 "\n"
-"This will search for the separator sep in the bytes, starting and the end. If\n"
+"This will search for the separator sep in the bytes, starting at the end. If\n"
 "the separator is found, returns a 3-tuple containing the part before the\n"
 "separator, the separator itself, and the part after it.\n"
 "\n"
@@ -499,4 +499,4 @@ bytes_fromhex(PyTypeObject *type, PyObject *arg)
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=9e3374bd7d04c163 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=fc9e02359cc56d36 input=a9049054013a1b77]*/
diff --git a/Objects/clinic/unicodeobject.c.h b/Objects/clinic/unicodeobject.c.h
index ca90e6d..0936527 100644
--- a/Objects/clinic/unicodeobject.c.h
+++ b/Objects/clinic/unicodeobject.c.h
@@ -682,7 +682,7 @@ PyDoc_STRVAR(unicode_rpartition__doc__,
 "\n"
 "Partition the string into three parts using the given separator.\n"
 "\n"
-"This will search for the separator in the string, starting and the end. If\n"
+"This will search for the separator in the string, starting at the end. If\n"
 "the separator is found, returns a 3-tuple containing the part before the\n"
 "separator, the separator itself, and the part after it.\n"
 "\n"
@@ -930,4 +930,4 @@ unicode_sizeof(PyObject *self, PyObject *Py_UNUSED(ignored))
 {
     return unicode_sizeof_impl(self);
 }
-/*[clinic end generated code: output=8fd799fd7f2cc724 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=816292e81a8a732e input=a9049054013a1b77]*/
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 2f30877..6533f41 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -13067,7 +13067,7 @@ str.rpartition as unicode_rpartition = str.partition
 
 Partition the string into three parts using the given separator.
 
-This will search for the separator in the string, starting and the end. If
+This will search for the separator in the string, starting at the end. If
 the separator is found, returns a 3-tuple containing the part before the
 separator, the separator itself, and the part after it.
 
@@ -13077,7 +13077,7 @@ and the original string.
 
 static PyObject *
 unicode_rpartition(PyObject *self, PyObject *sep)
-/*[clinic end generated code: output=1aa13cf1156572aa input=e77c7acb69bdfca6]*/
+/*[clinic end generated code: output=1aa13cf1156572aa input=c4b7db3ef5cf336a]*/
 {
     return PyUnicode_RPartition(self, sep);
 }