Improved the SYS_die function. (#366)

Thanks for your contribution :)

inc/sys.h

@@ -41,13 +41,13 @@
 
 /**
  *  \brief
- *      Put function in .data (RAM) instead of the default .text
+ *      Put function in .data (RAM) instead of the default .text
  */
-#define RAM_SECT                    __attribute__((section(".ramprog")))
+#define RAM_SECT                    __attribute__((section(".ramprog")))
 
 /**
  *  \brief
- *      Declare function for the hint callback (generate a RTE to return from interrupt instead of RTS)
+ *      Declare function for the hint callback (generate a RTE to return from interrupt instead of RTS)
  */
 #define HINTERRUPT_CALLBACK         __attribute__ ((interrupt)) void
 
@@ -489,10 +489,11 @@ bool SYS_isChecksumOk(void);
 /**
  *  \brief
  *      Die with the specified error message.<br>
- *      Program execution is interrupted.
- *
+ *      Program execution is interrupted.<br>
+ *      Accepts a list of strings. The list must end with a NULL value.
+ * 
  * This actually display an error message and program ends execution.
  */
-void SYS_die(char *err);
+void SYS_die(char *err, ...);
 
 #endif // _SYS_H_

src/sys.c

@@ -1042,13 +1042,27 @@ bool SYS_isChecksumOk()
 }
 
 
-void SYS_die(char *err)
+void SYS_die(char *err, ...)
 {
     SYS_setInterruptMaskLevel(7);
     VDP_init();
-    VDP_drawText("A fatal error occured !", 2, 2);
-    VDP_drawText("cannot continue...", 4, 3);
-    if (err) VDP_drawText(err, 0, 5);
+    VDP_setBackgroundColor(63);
+    VDP_drawText("A fatal error occured!", 9, 2);
+    VDP_drawText("cannot continue...", 11, 3);
+
+    u8 y = 5;
 
+    va_list argptr;
+    va_start(argptr, err);
+
+    const char* str = err;
+    while (str != NULL)
+    {
+        VDP_drawText(str, 1, y);
+        str = va_arg(argptr, const char*);
+        y++;
+    }
+    va_end(argptr);
+
     while(1);
-}
+}