Fix missing prototypes

i3 will now compile with no warnings when -Wmissing-prototypes is used.

src/commands.c

@@ -2034,7 +2034,7 @@ void cmd_rename_workspace(I3_CMD, const char *old_name, const char *new_name) {
  * Implementation of 'bar mode dock|hide|invisible|toggle [<bar_id>]'
  *
  */
-bool cmd_bar_mode(const char *bar_mode, const char *bar_id) {
+static bool cmd_bar_mode(const char *bar_mode, const char *bar_id) {
     int mode = M_DOCK;
     bool toggle = false;
     if (strcmp(bar_mode, "dock") == 0)
@@ -2079,7 +2079,7 @@ bool cmd_bar_mode(const char *bar_mode, const char *bar_id) {
  * Implementation of 'bar hidden_state hide|show|toggle [<bar_id>]'
  *
  */
-bool cmd_bar_hidden_state(const char *bar_hidden_state, const char *bar_id) {
+static bool cmd_bar_hidden_state(const char *bar_hidden_state, const char *bar_id) {
     int hidden_state = S_SHOW;
     bool toggle = false;
     if (strcmp(bar_hidden_state, "hide") == 0)

src/handlers.c

@@ -949,8 +949,8 @@ static void handle_client_message(xcb_client_message_event_t *event) {
     }
 }
 
-bool handle_window_type(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
-                        xcb_atom_t atom, xcb_get_property_reply_t *reply) {
+static bool handle_window_type(void *data, xcb_connection_t *conn, uint8_t state, xcb_window_t window,
+                               xcb_atom_t atom, xcb_get_property_reply_t *reply) {
     Con *con;
     if ((con = con_by_window_id(window)) == NULL || con->window == NULL)
         return false;

src/sighandler.c

@@ -299,7 +299,7 @@ static void sighandler_handle_key_press(xcb_key_press_event_t *event) {
     }
 }
 
-void handle_signal(int sig, siginfo_t *info, void *data) {
+static void handle_signal(int sig, siginfo_t *info, void *data) {
     DLOG("i3 crashed. SIG: %d\n", sig);
 
     struct sigaction action;

src/util.c

@@ -217,7 +217,7 @@ static char **add_argument(char **original, char *opt_char, char *opt_arg, char
 #define y(x, ...) yajl_gen_##x(gen, ##__VA_ARGS__)
 #define ystr(str) yajl_gen_string(gen, (unsigned char *)str, strlen(str))
 
-char *store_restart_layout(void) {
+static char *store_restart_layout(void) {
     setlocale(LC_NUMERIC, "C");
     yajl_gen gen = yajl_gen_alloc(NULL);
 

src/workspace.c

@@ -308,7 +308,7 @@ bool workspace_is_visible(Con *ws) {
  * XXX: we need to clean up all this recursive walking code.
  *
  */
-Con *_get_sticky(Con *con, const char *sticky_group, Con *exclude) {
+static Con *_get_sticky(Con *con, const char *sticky_group, Con *exclude) {
     Con *current;
 
     TAILQ_FOREACH(current, &(con->nodes_head), nodes) {