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, 4 insertions, 8 deletions

diff --git a/apps/plugins/euroconverter.c b/apps/plugins/euroconverter.c
index f85ee798c4..24cebe69d1 100644
--- a/apps/plugins/euroconverter.c
+++ b/apps/plugins/euroconverter.c
@@ -45,7 +45,7 @@ To do:
 - The Irish currency needs 6 digits after the . to have sufficient precision on big number
 */
 
-PLUGIN_HEADER
+
 
 /* Name and path of the config file*/
 static const char cfg_filename[] =  "euroconverter.cfg";
@@ -387,10 +387,8 @@ static int euro_menu(void)
 
 
 /* Call when the program end */
-static void euro_exit(void *parameter)
+static void euro_exit(void)
 {
-    (void)parameter;
-    
     //Restore the old pattern (i don't find another way to do this. An idea?)
     rb->lcd_unlock_pattern(heuro);
     rb->lcd_unlock_pattern(hhome);
@@ -411,6 +409,7 @@ enum plugin_status plugin_start(const void* parameter)
     /* if you don't use the parameter, you can do like
        this to avoid the compiler warning about it */
     (void)parameter;
+    atexit(euro_exit);
 
     /*Get the pattern handle*/
     heuro=rb->lcd_get_locked_pattern();
@@ -587,9 +586,7 @@ enum plugin_status plugin_start(const void* parameter)
                 break;
 
             default:
-                if (rb->default_event_handler_ex(button, euro_exit, NULL)
-                     == SYS_USB_CONNECTED)
-                    return PLUGIN_USB_CONNECTED;
+                exit_on_usb(button);
                 break;
         }
         /*Display*/
@@ -599,7 +596,6 @@ enum plugin_status plugin_start(const void* parameter)
             e=mydiv(h,currency[country]);
         display(e,h,pos);
     }
-    euro_exit(NULL);
     return PLUGIN_OK;
 }