configure.ac: Also check for Python 3.6.

[libsigrokdecode.git] / util.c

diff --git a/util.c b/util.c
index 6f80ff98688ad3457d262c71b5f566db86c281c1..bb353d0a694ba072cd61ac8025ea9bddddd4896e 100644 (file)
--- a/util.c
+++ b/util.c
@@ -21,6 +21,32 @@
 #include <config.h>
 #include "libsigrokdecode-internal.h" /* First, so we avoid a _POSIX_C_SOURCE warning. */
 
+/**
+ * Import a Python module by name.
+ *
+ * This function is implemented in terms of PyImport_Import() rather than
+ * PyImport_ImportModule(), so that the import hooks are not bypassed.
+ *
+ * @param[in] name The name of the module to load as UTF-8 string.
+ * @return The Python module object, or NULL if an exception occurred. The
+ *  caller is responsible for evaluating and clearing the Python error state.
+ *
+ * @private
+ */
+SRD_PRIV PyObject *py_import_by_name(const char *name)
+{
+       PyObject *py_mod, *py_modname;
+
+       py_modname = PyUnicode_FromString(name);
+       if (!py_modname)
+               return NULL;
+
+       py_mod = PyImport_Import(py_modname);
+       Py_DECREF(py_modname);
+
+       return py_mod;
+}
+
 /**
  * Get the value of a Python object's attribute, returned as a newly
  * allocated char *.
@@ -86,6 +112,84 @@ SRD_PRIV int py_dictitem_as_str(PyObject *py_obj, const char *key,
        return py_str_as_str(py_value, outstr);
 }
 
+/**
+ * Get the value of a Python dictionary item, returned as a newly
+ * allocated char *.
+ *
+ * @param py_obj The dictionary to probe.
+ * @param py_key Key of the item to retrieve.
+ * @param outstr Pointer 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.
+ *
+ * @private
+ */
+SRD_PRIV int py_pydictitem_as_str(PyObject *py_obj, PyObject *py_key,
+                               char **outstr)
+{
+       PyObject *py_value;
+
+       if (!py_obj || !py_key || !outstr)
+               return SRD_ERR_ARG;
+
+       if (!PyDict_Check(py_obj)) {
+               srd_dbg("Object is not a dictionary.");
+               return SRD_ERR_PYTHON;
+       }
+
+       if (!(py_value = PyDict_GetItem(py_obj, py_key))) {
+               srd_dbg("Dictionary has no such key.");
+               return SRD_ERR_PYTHON;
+       }
+
+       if (!PyUnicode_Check(py_value)) {
+               srd_dbg("Dictionary value should be a string.");
+               return SRD_ERR_PYTHON;
+       }
+
+       return py_str_as_str(py_value, outstr);
+}
+
+/**
+ * Get the value of a Python dictionary item, returned as a newly
+ * allocated char *.
+ *
+ * @param py_obj The dictionary to probe.
+ * @param py_key Key of the item to retrieve.
+ * @param out TODO.
+ *
+ * @return SRD_OK upon success, a (negative) error code otherwise.
+ *
+ * @private
+ */
+SRD_PRIV int py_pydictitem_as_long(PyObject *py_obj, PyObject *py_key, uint64_t *out)
+{
+       PyObject *py_value;
+
+       if (!py_obj || !py_key || !out)
+               return SRD_ERR_ARG;
+
+       if (!PyDict_Check(py_obj)) {
+               srd_dbg("Object is not a dictionary.");
+               return SRD_ERR_PYTHON;
+       }
+
+       if (!(py_value = PyDict_GetItem(py_obj, py_key))) {
+               srd_dbg("Dictionary has no such key.");
+               return SRD_ERR_PYTHON;
+       }
+
+       if (!PyLong_Check(py_value)) {
+               srd_dbg("Dictionary value should be a long.");
+               return SRD_ERR_PYTHON;
+       }
+
+       *out = PyLong_AsUnsignedLongLong(py_value);
+
+       return SRD_OK;
+}
+
 /**
  * Get the value of a Python unicode string object, returned as a newly
  * allocated char *.
@@ -196,6 +300,8 @@ err_out:
  *
  * @param[in] py_obj The Python object. Must not be NULL.
  * @return A floating reference to a new variant, or NULL on failure.
+ *
+ * @private
  */
 SRD_PRIV GVariant *py_obj_to_variant(PyObject *py_obj)
 {