1 files changed, 17 insertions, 4 deletions
diff --git a/Modules/_dbmmodule.c b/Modules/_dbmmodule.c
index 7e13441..8afd92c 100644
--- a/Modules/_dbmmodule.c
+++ b/Modules/_dbmmodule.c
@@ -412,7 +412,7 @@ static PyTypeObject Dbmtype = {
 
 _dbm.open as dbmopen
 
-    filename: str
+    filename: unicode
         The filename to open.
 
     flags: str="r"
@@ -429,9 +429,9 @@ Return a database object.
 [clinic start generated code]*/
 
 static PyObject *
-dbmopen_impl(PyObject *module, const char *filename, const char *flags,
+dbmopen_impl(PyObject *module, PyObject *filename, const char *flags,
              int mode)
-/*[clinic end generated code: output=5fade8cf16e0755f input=226334bade5764e6]*/
+/*[clinic end generated code: output=9527750f5df90764 input=376a9d903a50df59]*/
 {
     int iflags;
 
@@ -450,7 +450,20 @@ dbmopen_impl(PyObject *module, const char *filename, const char *flags,
                         "arg 2 to open should be 'r', 'w', 'c', or 'n'");
         return NULL;
     }
-    return newdbmobject(filename, iflags, mode);
+
+    PyObject *filenamebytes = PyUnicode_EncodeFSDefault(filename);
+    if (filenamebytes == NULL) {
+        return NULL;
+    }
+    const char *name = PyBytes_AS_STRING(filenamebytes);
+    if (strlen(name) != (size_t)PyBytes_GET_SIZE(filenamebytes)) {
+        Py_DECREF(filenamebytes);
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
+        return NULL;
+    }
+    PyObject *self = newdbmobject(name, iflags, mode);
+    Py_DECREF(filenamebytes);
+    return self;
 }
 
 static PyMethodDef dbmmodule_methods[] = {