Unified multiple definitions of container_of() macro.

Removed duplicate definitions of the container_of() macro and
refactored sources to use the single implementation.

Signed-off-by: Jon A. Cruz <jonc@osg.samsung.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>

clients/clickdot.c

@@ -40,6 +40,7 @@
 #include <wayland-client.h>
 
 #include "window.h"
+#include "shared/helpers.h"
 
 struct clickdot {
 	struct display *display;

clients/desktop-shell.c

@@ -45,6 +45,7 @@
 #include "window.h"
 #include "shared/cairo-util.h"
 #include "shared/config-parser.h"
+#include "shared/helpers.h"
 
 #include "desktop-shell-client-protocol.h"
 

clients/window.h

@@ -33,10 +33,6 @@
 #include "shared/zalloc.h"
 #include "shared/platform.h"
 
-#define container_of(ptr, type, member) ({				\
-	const __typeof__( ((type *)0)->member ) *__mptr = (ptr);	\
-	(type *)( (char *)__mptr - offsetof(type,member) );})
-
 struct window;
 struct widget;
 struct display;

desktop-shell/exposay.c

@@ -28,6 +28,7 @@
 #include <linux/input.h>
 
 #include "shell.h"
+#include "shared/helpers.h"
 
 struct exposay_surface {
 	struct desktop_shell *shell;

desktop-shell/input-panel.c

@@ -32,6 +32,7 @@
 #include "shell.h"
 #include "desktop-shell-server-protocol.h"
 #include "input-method-server-protocol.h"
+#include "shared/helpers.h"
 
 struct input_panel_surface {
 	struct wl_resource *resource;

fullscreen-shell/fullscreen-shell.c

@@ -34,6 +34,7 @@
 
 #include "compositor.h"
 #include "fullscreen-shell-server-protocol.h"
+#include "shared/helpers.h"
 
 struct fullscreen_shell {
 	struct wl_client *client;

ivi-shell/hmi-controller.c

@@ -60,6 +60,7 @@
 
 #include "ivi-layout-export.h"
 #include "ivi-hmi-controller-server-protocol.h"
+#include "shared/helpers.h"
 
 /*****************************************************************************
  *  structure, globals

ivi-shell/input-panel-ivi.c

@@ -34,6 +34,7 @@
 #include "ivi-shell.h"
 #include "input-method-server-protocol.h"
 #include "ivi-layout-private.h"
+#include "shared/helpers.h"
 
 struct input_panel_surface {
 	struct wl_resource *resource;

ivi-shell/ivi-layout.c

@@ -63,6 +63,7 @@
 #include "ivi-layout-export.h"
 #include "ivi-layout-private.h"
 
+#include "shared/helpers.h"
 #include "shared/os-compatibility.h"
 
 struct link_layer {

shared/config-parser.c

@@ -39,10 +39,7 @@
 
 #include <wayland-util.h>
 #include "config-parser.h"
-
-#define container_of(ptr, type, member) ({				\
-	const __typeof__( ((type *)0)->member ) *__mptr = (ptr);	\
-	(type *)( (char *)__mptr - offsetof(type,member) );})
+#include "helpers.h"
 
 struct weston_config_entry {
 	char *key;

shared/helpers.h

@@ -52,6 +52,43 @@ extern "C" {
 #define MIN(x,y) (((x) < (y)) ? (x) : (y))
 #endif
 
+/**
+ * Returns a pointer the the containing struct of a given member item.
+ *
+ * To demonstrate, the following example retrieves a pointer to
+ * `example_container` given only its `destroy_listener` member:
+ *
+ * @code
+ * struct example_container {
+ *     struct wl_listener destroy_listener;
+ *     // other members...
+ * };
+ *
+ * void example_container_destroy(struct wl_listener *listener, void *data)
+ * {
+ *     struct example_container *ctr;
+ *
+ *     ctr = wl_container_of(listener, ctr, destroy_listener);
+ *     // destroy ctr...
+ * }
+ * @endcode
+ *
+ * @param ptr A valid pointer to the contained item.
+ *
+ * @param type A pointer to the type of content that the list item
+ * stores. Type does not need be a valid pointer; a null or
+ * an uninitialised pointer will suffice.
+ *
+ * @param member The named location of ptr within the sample type.
+ *
+ * @return The container for the specified pointer.
+ */
+#ifndef container_of
+#define container_of(ptr, type, member) ({				\
+	const __typeof__( ((type *)0)->member ) *__mptr = (ptr);	\
+	(type *)( (char *)__mptr - offsetof(type,member) );})
+#endif
+
 #ifdef  __cplusplus
 }
 #endif

src/animation.c

@@ -34,6 +34,7 @@
 #include <fcntl.h>
 
 #include "compositor.h"
+#include "shared/helpers.h"
 
 WL_EXPORT void
 weston_spring_init(struct weston_spring *spring,

src/bindings.c

@@ -29,6 +29,7 @@
 #include <linux/input.h>
 
 #include "compositor.h"
+#include "shared/helpers.h"
 
 struct weston_binding {
 	uint32_t key;

src/clipboard.c

@@ -33,6 +33,7 @@
 #include <sys/uio.h>
 
 #include "compositor.h"
+#include "shared/helpers.h"
 
 struct clipboard_source {
 	struct weston_data_source base;

src/cms-colord.c

@@ -36,6 +36,7 @@
 
 #include "compositor.h"
 #include "cms-helper.h"
+#include "shared/helpers.h"
 
 struct cms_colord {
 	struct weston_compositor	*ec;

src/cms-static.c

@@ -30,6 +30,7 @@
 
 #include "compositor.h"
 #include "cms-helper.h"
+#include "shared/helpers.h"
 
 struct cms_static {
 	struct weston_compositor	*ec;

src/compositor.h

@@ -45,10 +45,6 @@ extern "C" {
 #include "zalloc.h"
 #include "timeline-object.h"
 
-#define container_of(ptr, type, member) ({				\
-	const __typeof__( ((type *)0)->member ) *__mptr = (ptr);	\
-	(type *)( (char *)__mptr - offsetof(type,member) );})
-
 struct weston_transform {
 	struct weston_matrix matrix;
 	struct wl_list link;

src/data-device.c

@@ -32,6 +32,7 @@
 #include <assert.h>
 
 #include "compositor.h"
+#include "shared/helpers.h"
 
 struct weston_drag {
 	struct wl_client *client;

src/libinput-device.c

@@ -38,6 +38,7 @@
 
 #include "compositor.h"
 #include "libinput-device.h"
+#include "shared/helpers.h"
 
 #define DEFAULT_AXIS_STEP_DISTANCE wl_fixed_from_int(10)
 

src/libinput-seat.c

@@ -37,6 +37,7 @@
 #include "launcher-util.h"
 #include "libinput-seat.h"
 #include "libinput-device.h"
+#include "shared/helpers.h"
 
 static const char default_seat[] = "seat0";
 static const char default_seat_name[] = "default";

src/pixman-renderer.c

@@ -32,6 +32,7 @@
 #include <assert.h>
 
 #include "pixman-renderer.h"
+#include "shared/helpers.h"
 
 #include <linux/input.h>
 

src/rpi-renderer.c

@@ -37,6 +37,7 @@
 
 #include "compositor.h"
 #include "rpi-renderer.h"
+#include "shared/helpers.h"
 
 #ifdef ENABLE_EGL
 #include <EGL/egl.h>

src/screen-share.c

@@ -40,6 +40,7 @@
 #include <wayland-client.h>
 
 #include "compositor.h"
+#include "shared/helpers.h"
 #include "shared/os-compatibility.h"
 #include "fullscreen-shell-client-protocol.h"
 

src/screenshooter.c

@@ -35,6 +35,7 @@
 
 #include "compositor.h"
 #include "screenshooter-server-protocol.h"
+#include "shared/helpers.h"
 
 #include "wcap/wcap-decode.h"
 

src/text-backend.c

@@ -35,6 +35,7 @@
 #include "compositor.h"
 #include "text-server-protocol.h"
 #include "input-method-server-protocol.h"
+#include "shared/helpers.h"
 
 struct text_input_manager;
 struct input_method;

src/zoom.c

@@ -29,6 +29,7 @@
 
 #include "compositor.h"
 #include "text-cursor-position-server-protocol.h"
+#include "shared/helpers.h"
 
 static void
 weston_zoom_frame_z(struct weston_animation *animation,

tests/ivi_layout-test-plugin.c

@@ -35,6 +35,7 @@
 #include "weston-test-server-protocol.h"
 #include "ivi-test.h"
 #include "ivi-shell/ivi-layout-export.h"
+#include "shared/helpers.h"
 
 struct test_context;
 

tests/weston-test.c

@@ -40,6 +40,8 @@
 #include "src/weston-egl-ext.h"
 #endif /* ENABLE_EGL */
 
+#include "shared/helpers.h"
+
 struct weston_test {
 	struct weston_compositor *compositor;
 	struct weston_layer layer;

xwayland/launcher.c

@@ -36,6 +36,7 @@
 #include <signal.h>
 
 #include "xwayland.h"
+#include "shared/helpers.h"
 
 
 static int