# HG changeset patch
# User Thinker K.F. Li <thinker@branda.to>
# Date 1229045727 -28800
# Node ID a0a3196b1a05513c8724fe6641fee1f5c0dba773
# Parent  5f144bab5de120e086246ff6274e892116ef1bba
Refactory pointer computation into a macro.
- It is hard to read a complicate pointer calculation.  A macro can make
  it more easy to be read.

diff -r 5f144bab5de1 -r a0a3196b1a05 tools/mb_c_source.m4
--- a/tools/mb_c_source.m4	Fri Dec 12 09:10:05 2008 +0800
+++ b/tools/mb_c_source.m4	Fri Dec 12 09:35:27 2008 +0800
@@ -355,6 +355,9 @@
 
 #ifndef MB_LSYM_GET_OBJ_WITH_NAME
 #define MB_LSYM_GET_OBJ_WITH_NAME
+
+#define MB_SPRITE_OFF_2_PTR(x, off) (((void *)(x)) + (off))
+
 static
 mb_obj_t *mb_lsym_get_obj_with_name(mb_sprite_lsym_t *lsym, const char *sym) {
     int i;
@@ -362,7 +365,8 @@
     for(i = 0; i < lsym->num_entries; i++) {
 	if(strcmp(lsym->entries[i].sym, sym) != 0)
 	    continue;
-	return (mb_obj_t *)*((int*)(((void *)lsym) + lsym->entries[i].offset));
+	return *(mb_obj_t **)MB_SPRITE_OFF_2_PTR(lsym,
+					         lsym->entries[i].offset);
     }
     return NULL;
 }