Function srd_decoder_load

libsigrokdecode4DSL/decoder.c:729–931

* Load a protocol decoder module into the embedded Python interpreter. * * @param module_name The module name to be loaded. * * @return SRD_OK upon success, a (negative) error code otherwise. * * @since 0.1.0 */

 * @since 0.1.0
 */
SRD_API int srd_decoder_load(const char *module_name)
{
	PyObject *py_basedec;
	struct srd_decoder *d;
	long apiver;
	int is_subclass;
	const char *fail_txt = NULL;
	PyGILState_STATE gstate;
  
	if (!srd_check_init())
		return SRD_ERR;

	if (!module_name)
		return SRD_ERR_ARG;

	gstate = PyGILState_Ensure();

	if (PyDict_GetItemString(PyImport_GetModuleDict(), module_name)) {
		/* Module was already imported. */
		PyGILState_Release(gstate);
		return SRD_OK;
	}

	d = malloc(sizeof(struct srd_decoder));
	if (d == NULL){
		srd_err("%s,ERROR:failed to alloc memory.", __func__);
		goto err_out;
	}
	memset(d, 0, sizeof(struct srd_decoder));

	fail_txt = NULL;

	//Load module from python script file,module_name is a sub directory
	d->py_mod = py_import_by_name(module_name);
	if (!d->py_mod) {
		fail_txt = "import by name failed";
		goto except_out;
	}

	if (!mod_sigrokdecode) {
		srd_err("sigrokdecode module not loaded.");
		fail_txt = "sigrokdecode(3) not loaded";
		goto err_out;
	}

	/* 
		Get the 'Decoder' class as Python object. 
		Here, Decoder is python class type
	*/
	d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder");
	if (!d->py_dec) {
		fail_txt = "no 'Decoder' attribute in imported module";
		goto except_out;
	}

	/*
	   Here, Decoder is c class type
	*/