Linux: added builtins to show devices and topics

list_devices will list virtual devices starting with "/dev/".
list_topics will list topics ("/obj/")

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/drivers/device/vdev.cpp

@@ -461,16 +461,35 @@ void VDev::showDevices()
 	int i=0;
 	printf("Devices:\n");
 	for (; i<PX4_MAX_DEV; ++i) {
-		if (devmap[i]) {
+		if (devmap[i] && strncmp(devmap[i]->name, "/dev/", 5) == 0) {
 			printf("   %s\n", devmap[i]->name);
 		}
 	}
 }
 
+void VDev::showTopics()
+{
+	int i=0;
+	printf("Devices:\n");
+	for (; i<PX4_MAX_DEV; ++i) {
+		if (devmap[i] && strncmp(devmap[i]->name, "/obj/", 5) == 0) {
+			printf("   %s\n", devmap[i]->name);
+		}
+	}
+}
+
+const char *VDev::topicList(unsigned int *next)
+{
+	for (;*next<PX4_MAX_DEV; (*next)++)
+		if (devmap[*next] && strncmp(devmap[(*next)]->name, "/obj/", 5) == 0)
+			return devmap[(*next)++]->name;
+	return NULL;
+}
+
 const char *VDev::devList(unsigned int *next)
 {
 	for (;*next<PX4_MAX_DEV; (*next)++)
-		if (devmap[*next])
+		if (devmap[*next] && strncmp(devmap[(*next)]->name, "/dev/", 5) == 0)
 			return devmap[(*next)++]->name;
 	return NULL;
 }

src/drivers/device/vdev.h

@@ -334,7 +334,9 @@ public:
 
 	static VDev *getDev(const char *path);
 	static void showDevices(void);
+	static void showTopics(void);
 	static const char *devList(unsigned int *next);
+	static const char *topicList(unsigned int *next);
 
 protected:
 

src/drivers/device/vdev_posix.cpp

@@ -274,10 +274,20 @@ void px4_show_devices()
 	VDev::showDevices();
 }
 
+void px4_show_topics()
+{
+	VDev::showTopics();
+}
+
 const char * px4_get_device_names(unsigned int *handle)
 {
 	return VDev::devList(handle);
 }
 
+const char * px4_get_topic_names(unsigned int *handle)
+{
+	return VDev::topicList(handle);
+}
+
 }