LUA_MAXUNSIGNED was only used to define 2.0^intnumbits (and that

definition was not strictly portable), so it was removed and
replaced by a more correct and direct definition for 2.0^intnumbits
(only where it was needed)

lapi.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lapi.c,v 2.218 2014/06/12 19:07:30 roberto Exp roberto $
+** $Id: lapi.c,v 2.219 2014/06/19 18:27:20 roberto Exp roberto $
 ** Lua API
 ** See Copyright Notice in lua.h
 */
@@ -372,6 +372,11 @@ LUA_API lua_Integer lua_tointegerx (lua_State *L, int idx, int *pisnum) {
 }
 
 
+#if !defined(LUAI_FTWO2N)
+/* 2.0^(numbits in an integer), computed without roundings */
+#define LUAI_FTWO2N	(cast_num(LUA_MININTEGER) * cast_num(-2))
+#endif
+
 LUA_API lua_Unsigned lua_tounsignedx (lua_State *L, int idx, int *pisnum) {
   lua_Unsigned res = 0;
   const TValue *o = index2addr(L, idx);
@@ -383,7 +388,7 @@ LUA_API lua_Unsigned lua_tounsignedx (lua_State *L, int idx, int *pisnum) {
       break;
     }
     case LUA_TNUMFLT: {  /* compute floor(n) % 2^(numbits in an integer) */
-      const lua_Number two2n = cast_num(LUA_MAXUNSIGNED) + cast_num(1);
+      const lua_Number two2n = LUAI_FTWO2N;
       lua_Number n = fltvalue(o);  /* get value */
       int neg = 0;
       n = l_floor(n);  /* get its floor */

luaconf.h

@@ -1,5 +1,5 @@
 /*
-** $Id: luaconf.h,v 1.206 2014/06/02 00:03:16 roberto Exp roberto $
+** $Id: luaconf.h,v 1.207 2014/06/10 19:21:20 roberto Exp roberto $
 ** Configuration file for Lua
 ** See Copyright Notice in lua.h
 */
@@ -569,7 +569,6 @@
 @@ LUA_INTEGER_FMT is the format for writing integers.
 @@ LUA_MAXINTEGER is the maximum value for a LUA_INTEGER.
 @@ LUA_MININTEGER is the minimum value for a LUA_INTEGER.
-@@ LUA_MAXUNSIGNED is the maximum value for a LUA_UNSIGNED.
 @@ lua_integer2str converts an integer to a string.
 */
 
@@ -595,7 +594,6 @@
 #define LUA_INTEGER		int
 #define LUA_INTEGER_FRMLEN	""
 
-#define LUA_MAXUNSIGNED		UINT_MAX
 #define LUA_MAXINTEGER		INT_MAX
 #define LUA_MININTEGER		INT_MIN
 
@@ -604,7 +602,6 @@
 #define LUA_INTEGER		long
 #define LUA_INTEGER_FRMLEN	"l"
 
-#define LUA_MAXUNSIGNED		ULONG_MAX
 #define LUA_MAXINTEGER		LONG_MAX
 #define LUA_MININTEGER		LONG_MIN
 
@@ -615,7 +612,6 @@
 #define LUA_INTEGER		__int64
 #define LUA_INTEGER_FRMLEN	"I64"
 
-#define LUA_MAXUNSIGNED		_UI64_MAX
 #define LUA_MAXINTEGER		_I64_MAX
 #define LUA_MININTEGER		_I64_MIN
 
@@ -624,7 +620,6 @@
 #define LUA_INTEGER		long long
 #define LUA_INTEGER_FRMLEN	"ll"
 
-#define LUA_MAXUNSIGNED		ULLONG_MAX
 #define LUA_MAXINTEGER		LLONG_MAX
 #define LUA_MININTEGER		LLONG_MIN
 
@@ -639,7 +634,6 @@
 #define LUA_INTEGER		short int
 #define LUA_INTEGER_FRMLEN	""
 
-#define LUA_MAXUNSIGNED		((LUA_UNSIGNED)USHRT_MAX)
 #define LUA_MAXINTEGER		SHRT_MAX
 #define LUA_MININTEGER		SHRT_MIN