Introduce plugin_crt0.c that every plugin links.

It handles exit() properly, calling the handler also when the plugin returns
normally (also it makes exit() more standard compliant while at it).
It also holds PLUGIN_HEADER, so that it doesn't need to be in each plugin anymore.

To work better together with callbacks passed to rb->default_event_handler_ex introduce exit_on_usb() which will call the exit handler before showing the usb screen and exit() after it.
In most cases it was passed a callback which was manually called at all other return points. This can now be done via atexit().

In future plugin_crt0.c could also handle clearing bss, initializing iram and more.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27862 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 13 insertions, 19 deletions

diff --git a/apps/plugins/plasma.c b/apps/plugins/plasma.c
index 637d948f3d..35bc03ba1f 100644
--- a/apps/plugins/plasma.c
+++ b/apps/plugins/plasma.c
@@ -27,6 +27,7 @@
 #include "plugin.h"
 #include "lib/helper.h"
 #include "lib/pluginlib_actions.h"
+#include "lib/pluginlib_exit.h"
 
 #ifdef HAVE_LCD_BITMAP
 
@@ -35,7 +36,6 @@
 #endif
 #include "lib/fixedpoint.h"
 
-PLUGIN_HEADER
 
 /******************************* Globals ***********************************/
 
@@ -131,10 +131,8 @@ static void shades_generate(void)
 }
 #endif
 
-void cleanup(void *parameter)
+void cleanup(void)
 {
-    (void)parameter;
-
 #ifdef HAVE_ADJUSTABLE_CPU_FREQ
     if (boosted)
         rb->cpu_boost(false);
@@ -144,6 +142,9 @@ void cleanup(void *parameter)
 #endif
     /* Turn on backlight timeout (revert to settings) */
     backlight_use_settings(); /* backlight control in lib/helper.c */
+#if defined(HAVE_LCD_MODES) && (HAVE_LCD_MODES & LCD_MODE_PAL256)
+    rb->lcd_set_mode(LCD_MODE_RGB565);
+#endif
 }
 
 /*
@@ -180,10 +181,15 @@ int main(void)
     /* get the remainder of the plugin buffer */
     gbuf = (unsigned char *) rb->plugin_get_buffer(&gbuf_size);
 
-    grey_init(gbuf, gbuf_size, GREY_ON_COP, LCD_WIDTH, LCD_HEIGHT, NULL);
+    if (!grey_init(gbuf, gbuf_size, GREY_ON_COP, LCD_WIDTH, LCD_HEIGHT, NULL))
+    {
+        rb->splash(HZ, "Couldn't init greyscale display");
+        return PLUGIN_ERROR;
+    }
     /* switch on greyscale overlay */
     grey_show(true);
 #endif
+    atexit(cleanup);
     sp1 = 4;
     sp2 = 2;
     sp3 = 4;
@@ -261,7 +267,6 @@ int main(void)
         {
             case PLA_EXIT:
             case PLA_CANCEL:
-                cleanup(NULL);
                 return PLUGIN_OK;
                 break;
 
@@ -299,9 +304,7 @@ int main(void)
 #endif
 
             default:
-                if (rb->default_event_handler_ex(action, cleanup, NULL)
-                    == SYS_USB_CONNECTED)
-                    return PLUGIN_USB_CONNECTED;
+                exit_on_usb(action);
                 break;
         }
     }
@@ -311,8 +314,6 @@ int main(void)
 
 enum plugin_status plugin_start(const void* parameter)
 {
-    int ret;
-
     (void)parameter;
 #if LCD_DEPTH > 1
     rb->lcd_set_backdrop(NULL);
@@ -323,14 +324,7 @@ enum plugin_status plugin_start(const void* parameter)
 #if defined(HAVE_LCD_MODES) && (HAVE_LCD_MODES & LCD_MODE_PAL256)
     rb->lcd_set_mode(LCD_MODE_PAL256);
 #endif
-
-    ret = main();
-
-#if defined(HAVE_LCD_MODES) && (HAVE_LCD_MODES & LCD_MODE_PAL256)
-    rb->lcd_set_mode(LCD_MODE_RGB565);
-#endif
-
-    return ret;
+    return main();
 }
 
 #endif /* HAVE_LCD_BITMAP */