configuration for NaN trick big-endian + macro 'luai_checknum' to

ensure numbers comming from C are not "improper" (some kinds of
signaling NaNs)

lobject.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.h,v 2.58 2011/06/07 19:02:33 roberto Exp roberto $
+** $Id: lobject.h,v 2.59 2011/06/09 18:21:25 roberto Exp roberto $
 ** Type definitions for Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -262,7 +262,7 @@ typedef struct lua_TValue TValue;
 ** =======================================================
 */
 
-#if defined(LUA_NANTRICK)
+#if defined(LUA_NANTRICKLE) || defined(LUA_NANTRICKBE)
 
 /*
 ** numbers are represented in the 'd_' field. All other values have the
@@ -270,11 +270,20 @@ typedef struct lua_TValue TValue;
 ** a "signaled NaN", which is never generated by regular operations by
 ** the CPU (nor by 'strtod')
 */
+#if !defined(NNMARK)
 #define NNMARK		0x7FF7A500
+#endif
 
 #undef TValuefields
+#if defined(LUA_NANTRICKLE)
+/* little endian */
 #define TValuefields  \
 	union { struct { Value v_; int tt_; } i; double d_; } u
+#else
+/* big endian */
+#define TValuefields  \
+	union { struct { int tt_; Value v_; } i; double d_; } u
+#endif
 
 #undef numfield
 #define numfield	/* no such field; numbers are the entire struct */
@@ -322,6 +331,14 @@ typedef struct lua_TValue TValue;
 	(ttisnumber(o1) ? ttisnumber(o2) : ((o1)->u.i.tt_ == (o2)->u.i.tt_))
 
 
+
+#define luai_checknum(L,o,c)	{ if (!ttisnumber(o)) c; }
+
+
+#else
+
+#define luai_checknum(L,o,c)	{ /* empty */ }
+
 #endif
 /* }====================================================== */