Implement hashtable to store server supported command list.

AT command could be action command or parameter command. Defined
in V.250 5.2.5.
---
 gatchat/gatserver.c |   29 +++++++++++++++++++++++++++++
 gatchat/gatserver.h |   21 +++++++++++++++++++++
 2 files changed, 50 insertions(+), 0 deletions(-)

diff --git a/gatchat/gatserver.c b/gatchat/gatserver.c
index 4a19b6b..829dc1d 100644
--- a/gatchat/gatserver.c
+++ b/gatchat/gatserver.c
@@ -75,6 +75,16 @@ static const char *server_result_to_string(GAtServerResult result)
 	}
 }
 
+/* AT command set that server supported */
+struct at_command {
+	int id;
+	char *prefix;
+	GAtServerCommandType type;
+	GAtServerNotifyFunc notify;
+	gpointer user_data;
+	GDestroyNotify destroy_notify;
+};
+
 /* Basic command setting for V.250 */
 struct v250_settings {
 	char s3;			/* set by S3=<val> */
@@ -99,6 +109,8 @@ struct _GAtServer {
 	gpointer user_disconnect_data;		/* User disconnect data */
 	GAtDebugFunc debugf;			/* Debugging output function */
 	gpointer debug_data;			/* Data to pass to debug func */
+	GHashTable *command_list;		/* List of supported at command */
+	guint next_command_id;			/* Next command id */
 	struct ring_buffer *read_buf;		/* Current read buffer */
 	GQueue *write_queue;			/* Write buffer queue */
 	guint max_read_attempts;		/* Max reads per select */
@@ -714,6 +726,14 @@ static gboolean can_write_data(GIOChannel *channel, GIOCondition cond,
 	return FALSE;
 }
 
+static void at_command_free(gpointer key, gpointer value, gpointer data)
+{
+	struct at_command *node = value;
+
+	g_free(node->prefix);
+	g_free(node);
+}
+
 static void write_queue_free(GQueue *write_queue)
 {
 	struct ring_buffer *write_buf;
@@ -733,6 +753,11 @@ static void g_at_server_cleanup(GAtServer *server)
 	/* Cleanup pending data to write */
 	write_queue_free(server->write_queue);
 
+	/* Cleanup registered notifications */
+	g_hash_table_foreach(server->command_list, at_command_free, NULL);
+	g_hash_table_destroy(server->command_list);
+	server->command_list = NULL;
+
 	server->channel = NULL;
 }
 
@@ -792,6 +817,7 @@ GAtServer *g_at_server_new(GIOChannel *io)
 	server->ref_count = 1;
 	v250_settings_create(&server->v250);
 	server->channel = io;
+	server->command_list = g_hash_table_new(g_str_hash, g_str_equal);
 	server->read_buf = ring_buffer_new(BUF_SIZE);
 	if (!server->read_buf)
 		goto error;
@@ -816,6 +842,9 @@ GAtServer *g_at_server_new(GIOChannel *io)
 	return server;
 
 error:
+	if (server->command_list)
+		g_hash_table_destroy(server->command_list);
+
 	if (server->read_buf)
 		ring_buffer_free(server->read_buf);
 
diff --git a/gatchat/gatserver.h b/gatchat/gatserver.h
index 698f7e0..5db9321 100644
--- a/gatchat/gatserver.h
+++ b/gatchat/gatserver.h
@@ -26,6 +26,7 @@
 extern "C" {
 #endif
 
+#include "gatresult.h"
 #include "gatutil.h"
 
 struct _GAtServer;
@@ -46,6 +47,26 @@ enum _GAtServerResult {
 
 typedef enum _GAtServerResult GAtServerResult;
 
+enum _GAtServerRequestType {
+	G_AT_SERVER_REQUEST_TYPE_NONE,
+	G_AT_SERVER_REQUEST_TYPE_ACTION,
+	G_AT_SERVER_REQUEST_TYPE_QUERY,
+	G_AT_SERVER_REQUEST_TYPE_SET,
+	G_AT_SERVER_REQUEST_TYPE_SUPPORT,
+};
+
+typedef enum _GAtServerRequestType GAtServerRequestType;
+
+enum _GAtServerCommandType {
+	G_AT_SERVER_COMMAND_TYPE_ACTION,
+	G_AT_SERVER_COMMAND_TYPE_PARAMETER,
+};
+
+typedef enum _GAtServerCommandType GAtServerCommandType;
+
+typedef int (*GAtServerNotifyFunc)(GAtServerRequestType type, GAtResult *result,
+					gpointer user_data);
+
 GAtServer *g_at_server_new(GIOChannel *io);
 
 GAtServer *g_at_server_ref(GAtServer *server);
-- 
1.6.6.1