Check for config key availability before using it.

diff --git a/show.c b/show.c
index 86845ff2d6183385981afae3256677c830b20197..ca6cb1188444a213126f0f7bd83345a742c31d86 100644 (file)
--- a/show.c
+++ b/show.c
@@ -135,6 +135,33 @@ static gint sort_channels(gconstpointer a, gconstpointer b)
        return pa->index - pb->index;
 }
 
+static gboolean config_key_has_cap(const struct sr_dev_inst *sdi,
+          struct sr_channel_group *cg, uint32_t key, uint32_t capability)
+{
+       struct sr_dev_driver *driver;
+       GVariant *gvar_opts;
+       const uint32_t *opts;
+       gsize num_opts, i;
+
+       driver = sr_dev_inst_driver_get(sdi);
+       if (sr_config_list(driver, sdi, cg, SR_CONF_DEVICE_OPTIONS,
+                       &gvar_opts) != SR_OK)
+               return FALSE;
+
+       opts = g_variant_get_fixed_array(gvar_opts, &num_opts, sizeof(uint32_t));
+       for (i = 0; i < num_opts; i++) {
+               if ((opts[i] & SR_CONF_MASK) == key) {
+                       if (opts[i] & capability)
+                               return TRUE;
+                       else
+                               return FALSE;
+               }
+       }
+
+       return FALSE;
+}
+
+
 static void print_dev_line(const struct sr_dev_inst *sdi)
 {
        struct sr_channel *ch;
@@ -152,7 +179,8 @@ static void print_dev_line(const struct sr_dev_inst *sdi)
 
        s = g_string_sized_new(128);
        g_string_assign(s, driver->name);
-       if (sr_config_get(driver, sdi, NULL, SR_CONF_CONN, &gvar) == SR_OK) {
+       if (config_key_has_cap(sdi, NULL, SR_CONF_CONN, SR_CONF_GET)
+                       && sr_config_get(driver, sdi, NULL, SR_CONF_CONN, &gvar) == SR_OK) {
                g_string_append(s, ":conn=");
                g_string_append(s, g_variant_get_string(gvar, NULL));
                g_variant_unref(gvar);
@@ -208,8 +236,8 @@ void show_drv_detail(struct sr_dev_driver *driver)
        const uint32_t *opts;
        gsize num_elements, i;
 
-       if ((sr_config_list(driver, NULL, NULL, SR_CONF_DEVICE_OPTIONS,
-                       &gvar_opts) == SR_OK)) {
+       if (sr_config_list(driver, NULL, NULL, SR_CONF_DEVICE_OPTIONS,
+                       &gvar_opts) == SR_OK) {
                opts = g_variant_get_fixed_array(gvar_opts, &num_elements,
                                sizeof(uint32_t));
                if (num_elements) {
@@ -223,8 +251,8 @@ void show_drv_detail(struct sr_dev_driver *driver)
                g_variant_unref(gvar_opts);
        }
 
-       if ((sr_config_list(driver, NULL, NULL, SR_CONF_SCAN_OPTIONS,
-                       &gvar_opts) == SR_OK)) {
+       if (sr_config_list(driver, NULL, NULL, SR_CONF_SCAN_OPTIONS,
+                       &gvar_opts) == SR_OK) {
                opts = g_variant_get_fixed_array(gvar_opts, &num_elements,
                                sizeof(uint32_t));
                if (num_elements) {
@@ -293,8 +321,8 @@ void show_dev_detail(void)
        select_channels(sdi);
        channel_group = select_channel_group(sdi);
 
-       if ((sr_config_list(driver, sdi, channel_group, SR_CONF_DEVICE_OPTIONS,
-                       &gvar_opts)) != SR_OK)
+       if (sr_config_list(driver, sdi, channel_group, SR_CONF_DEVICE_OPTIONS,
+                       &gvar_opts) != SR_OK)
                /* Driver supports no device instance options. */
                return;