srd: don't load all protocol decoders unless we really need to.

[libsigrokdecode.git] / decoder.c

diff --git a/decoder.c b/decoder.c
index e3f847d205ea7db534ad9e93b2372fb7bf057774..33521c4045e3e297b27103a19b3e333033bd55fc 100644 (file)
--- a/decoder.c
+++ b/decoder.c
@@ -124,18 +124,17 @@ err_out:
  * Load a protocol decoder module into the embedded Python interpreter.
  *
  * @param name The module name to be loaded.
- * @param dec Pointer to the struct srd_decoder filled with the loaded module.
  *
  * @return SRD_OK upon success, a (negative) error code otherwise.
  */
-SRD_API int srd_load_decoder(const char *name, struct srd_decoder **dec)
+SRD_API int srd_load_decoder(const char *module_name)
 {
        PyObject *py_basedec, *py_method, *py_attr, *py_annlist, *py_ann;
        struct srd_decoder *d;
        int alen, ret, i;
        char **ann;
 
-       srd_dbg("Loading module '%s'.", name);
+       srd_dbg("Loading module '%s'.", module_name);
 
        py_basedec = py_method = py_attr = NULL;
 
@@ -148,8 +147,8 @@ SRD_API int srd_load_decoder(const char *name, struct srd_decoder **dec)
        ret = SRD_ERR_PYTHON;
 
        /* Import the Python module. */
-       if (!(d->py_mod = PyImport_ImportModule(name))) {
-               catch_exception("import of '%s' failed.", name);
+       if (!(d->py_mod = PyImport_ImportModule(module_name))) {
+               catch_exception("import of '%s' failed.", module_name);
                goto err_out;
        }
 
@@ -157,7 +156,7 @@ SRD_API int srd_load_decoder(const char *name, struct srd_decoder **dec)
        if (!(d->py_dec = PyObject_GetAttrString(d->py_mod, "Decoder"))) {
                /* This generated an AttributeError exception. */
                PyErr_Clear();
-               srd_err("Decoder class not found in protocol decoder %s.", name);
+               srd_err("Decoder class not found in protocol decoder %s.", module_name);
                goto err_out;
        }
 
@@ -168,7 +167,7 @@ SRD_API int srd_load_decoder(const char *name, struct srd_decoder **dec)
 
        if (!PyObject_IsSubclass(d->py_dec, py_basedec)) {
                srd_err("Decoder class in protocol decoder module %s is not "
-                       "a subclass of sigrokdecode.Decoder.", name);
+                       "a subclass of sigrokdecode.Decoder.", module_name);
                goto err_out;
        }
        Py_CLEAR(py_basedec);
@@ -176,13 +175,13 @@ SRD_API int srd_load_decoder(const char *name, struct srd_decoder **dec)
        /* Check for a proper start() method. */
        if (!PyObject_HasAttrString(d->py_dec, "start")) {
                srd_err("Protocol decoder %s has no start() method Decoder "
-                       "class.", name);
+                       "class.", module_name);
                goto err_out;
        }
        py_method = PyObject_GetAttrString(d->py_dec, "start");
        if (!PyFunction_Check(py_method)) {
                srd_err("Protocol decoder %s Decoder class attribute 'start' "
-                       "is not a method.", name);
+                       "is not a method.", module_name);
                goto err_out;
        }
        Py_CLEAR(py_method);
@@ -190,13 +189,13 @@ SRD_API int srd_load_decoder(const char *name, struct srd_decoder **dec)
        /* Check for a proper decode() method. */
        if (!PyObject_HasAttrString(d->py_dec, "decode")) {
                srd_err("Protocol decoder %s has no decode() method Decoder "
-                       "class.", name);
+                       "class.", module_name);
                goto err_out;
        }
        py_method = PyObject_GetAttrString(d->py_dec, "decode");
        if (!PyFunction_Check(py_method)) {
                srd_err("Protocol decoder %s Decoder class attribute 'decode' "
-                       "is not a method.", name);
+                       "is not a method.", module_name);
                goto err_out;
        }
        Py_CLEAR(py_method);
@@ -247,7 +246,7 @@ SRD_API int srd_load_decoder(const char *name, struct srd_decoder **dec)
                py_annlist = PyObject_GetAttrString(d->py_dec, "annotations");
                if (!PyList_Check(py_annlist)) {
                        srd_err("Protocol decoder module %s annotations "
-                               "should be a list.", name);
+                               "should be a list.", module_name);
                        goto err_out;
                }
                alen = PyList_Size(py_annlist);
@@ -256,7 +255,7 @@ SRD_API int srd_load_decoder(const char *name, struct srd_decoder **dec)
                        if (!PyList_Check(py_ann) || PyList_Size(py_ann) != 2) {
                                srd_err("Protocol decoder module %s "
                                        "annotation %d should be a list with "
-                                       "two elements.", name, i + 1);
+                                       "two elements.", module_name, i + 1);
                                goto err_out;
                        }
 
@@ -267,7 +266,9 @@ SRD_API int srd_load_decoder(const char *name, struct srd_decoder **dec)
                }
        }
 
-       *dec = d;
+       /* Append it to the list of supported/loaded decoders. */
+       pd_list = g_slist_append(pd_list, d);
+
        ret = SRD_OK;
 
 err_out:
@@ -372,7 +373,7 @@ SRD_API int srd_unload_decoder(struct srd_decoder *dec)
 }
 
 /**
- * Load all protocol decoders libsigrokdecode knows about.
+ * Load all installed protocol decoders.
  *
  * @return SRD_OK upon success, a (negative) error code otherwise.
  */
@@ -380,23 +381,16 @@ SRD_API int srd_load_all_decoders(void)
 {
        GDir *dir;
        GError *error;
-       struct srd_decoder *dec;
-       int ret;
        const gchar *direntry;
-       char *decodername;
 
        if (!(dir = g_dir_open(DECODERS_DIR, 0, &error))) {
+               srd_err("Unable to open %s for reading.", DECODERS_DIR);
                return SRD_ERR_DECODERS_DIR;
        }
 
        while ((direntry = g_dir_read_name(dir)) != NULL) {
-               /* The decoder name is the PD directory name (e.g. "i2c"). */
-               decodername = g_strdup(direntry);
-
-               if ((ret = srd_load_decoder(decodername, &dec)) == SRD_OK) {
-                       /* Append it to the list of supported/loaded decoders. */
-                       pd_list = g_slist_append(pd_list, dec);
-               }
+               /* The directory name is the module name (e.g. "i2c"). */
+               srd_load_decoder(direntry);
        }
        g_dir_close(dir);