2 files changed, 8 insertions, 9 deletions

diff --git a/lapi.c b/lapi.c
index a4b51194..c5d90ac4 100644
--- a/lapi.c
+++ b/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 */
diff --git a/luaconf.h b/luaconf.h
index 3afce703..45451660 100644
--- a/luaconf.h
+++ b/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