add py_dictitem_as_str(), more checking in py_attr_as_str()

[libsigrokdecode.git] / util.c

diff --git a/util.c b/util.c
index 7e2b82cbad13ed1d0b043a0490391cee2648f76f..c65cbfdde07e515f09b119419b37695074475e82 100644 (file)
--- a/util.c
+++ b/util.c
@@ -50,13 +50,58 @@ int py_attr_as_str(PyObject *py_obj, const char *attr, char **outstr)
                return SRD_ERR_PYTHON;
        }
 
+       if (!PyUnicode_Check(py_str)) {
+               srd_err("%s attribute should be a string, but is a %s.",
+                               attr, py_str->ob_type->tp_name);
+               Py_DecRef(py_str);
+               return SRD_ERR_PYTHON;
+       }
+
        ret = py_str_as_str(py_str, outstr);
-       Py_XDECREF(py_str);
+       Py_DecRef(py_str);
 
        return ret;
 }
 
 
+/**
+ * Get the value of a python dictionary item, returned as a newly
+ * allocated char *.
+ *
+ * @param py_obj The dictionary to probe.
+ * @param attr Key of the item to retrieve.
+ * @param outstr ptr to char * storage to be filled in.
+ *
+ * @return SRD_OK upon success, a (negative) error code otherwise.
+ *         The 'outstr' argument points to a malloc()ed string upon success.
+ */
+int py_dictitem_as_str(PyObject *py_obj, const char *key, char **outstr)
+{
+       PyObject *py_value;
+       int ret;
+
+       if (!PyDict_Check(py_obj)) {
+               srd_err("Object is not a dictionary.");
+               return SRD_ERR_PYTHON;
+       }
+
+       if (!(py_value = PyDict_GetItemString(py_obj, key))) {
+               srd_err("Dictionary has no attribute '%s'", key);
+               return SRD_ERR_PYTHON;
+       }
+
+       if (!PyUnicode_Check(py_value)) {
+               srd_err("Dictionary value should be a string, but is a %s.",
+                               key, py_value->ob_type->tp_name);
+               return SRD_ERR_PYTHON;
+       }
+
+       ret = py_str_as_str(py_value, outstr);
+
+       return SRD_OK;
+}
+
+
 /**
  * Get the value of a python unicode string object, returned as a newly
  * allocated char *.