Move ARRAY_LENGTH out of public headers

Exporting unprefixed symbols is a pretty bad idea so don't do that.
Instea of redefining it WL_ARRAY_LENGTH, we just move the define to
our private header.  The scanner generates code that uses ARRAY_LENGTH,
but we can just make it count the number elements and emit an integer
constant instead.

cursor/wayland-cursor.c

@@ -31,6 +31,8 @@
 
 #include "os-compatibility.h"
 
+#define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
+
 struct shm_pool {
 	struct wl_shm_pool *pool;
 	int fd;

src/event-loop.c

@@ -35,6 +35,7 @@
 #include <unistd.h>
 #include <assert.h>
 #include "wayland-server.h"
+#include "wayland-private.h"
 #include "wayland-os.h"
 
 struct wl_event_loop {

src/scanner.c

@@ -127,6 +127,18 @@ struct parse_context {
 	unsigned int character_data_length;
 };
 
+static int
+list_length(struct wl_list *list)
+{
+	struct wl_list *l;
+	int i;
+
+	for (i = 0, l = list->next; l != list; i++, l = l->next)
+		;
+
+	return i;
+}
+
 static char *
 uppercase_dup(const char *src)
 {
@@ -1106,14 +1118,14 @@ emit_code(struct protocol *protocol)
 		       i->name, i->name, i->version);
 
 		if (!wl_list_empty(&i->request_list))
-			printf("\tARRAY_LENGTH(%s_requests), %s_requests,\n",
-			       i->name, i->name);
+			printf("\t%d, %s_requests,\n",
+			       list_length(&i->request_list), i->name);
 		else
 			printf("\t0, NULL,\n");
 
 		if (!wl_list_empty(&i->event_list))
-			printf("\tARRAY_LENGTH(%s_events), %s_events,\n",
-			       i->name, i->name);
+			printf("\t%d, %s_events,\n",
+			       list_length(&i->event_list), i->name);
 		else
 			printf("\t0, NULL,\n");
 

src/wayland-private.h

@@ -28,6 +28,8 @@
 #include <ffi.h>
 #include "wayland-util.h"
 
+#define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
+
 #define WL_ZOMBIE_OBJECT ((void *) 2)
 
 #define WL_MAP_SERVER_SIDE 0

src/wayland-util.h

@@ -39,8 +39,6 @@ extern "C" {
 #define WL_EXPORT
 #endif
 
-#define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
-
 #define container_of(ptr, type, member) ({				\
 	const __typeof__( ((type *)0)->member ) *__mptr = (ptr);	\
 	(type *)( (char *)__mptr - offsetof(type,member) );})