new macro 'cvt2num' to better control whether strings are convertible

to numbers

lvm.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 2.220 2014/07/21 16:02:10 roberto Exp roberto $
+** $Id: lvm.c,v 2.221 2014/07/30 14:00:14 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -66,7 +66,7 @@ int luaV_tonumber_ (const TValue *obj, lua_Number *n) {
     *n = fltvalue(obj);
     return 1;
   }
-  else if (ttisstring(obj) &&  /* string convertible to number? */
+  else if (cvt2num(obj) &&  /* string convertible to number? */
             luaO_str2num(svalue(obj), &v) == tsvalue(obj)->len + 1) {
     obj = &v;
     goto again;  /* convert result from 'luaO_str2num' to a float */
@@ -98,7 +98,7 @@ static int tointeger_aux (const TValue *obj, lua_Integer *p, int mode) {
     *p = ivalue(obj);
     return 1;
   }
-  else if (ttisstring(obj) &&
+  else if (cvt2num(obj) &&
             luaO_str2num(svalue(obj), &v) == tsvalue(obj)->len + 1) {
     obj = &v;
     goto again;  /* convert result from 'luaO_str2num' to an integer */

lvm.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.h,v 2.31 2014/05/26 17:10:22 roberto Exp roberto $
+** $Id: lvm.h,v 2.32 2014/07/30 14:00:14 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -13,6 +13,20 @@
 #include "ltm.h"
 
 
+#if !defined(LUA_NOCVTN2S)
+#define cvt2str(o)	ttisnumber(o)
+#else
+#define cvt2str(o)	0	/* no convertion from numbers to strings */
+#endif
+
+
+#if !defined(LUA_NOCVTS2N)
+#define cvt2num(o)	ttisstring(o)
+#else
+#define cvt2num(o)	0	/* no convertion from strings to numbers */
+#endif
+
+
 #define tonumber(o,n) \
 	(ttisfloat(o) ? (*(n) = fltvalue(o), 1) : luaV_tonumber_(o,n))
 
@@ -24,13 +38,6 @@
 #define luaV_rawequalobj(t1,t2)		luaV_equalobj(NULL,t1,t2)
 
 
-#if !defined(LUA_NOCVTN2S)
-#define cvt2str(o)	ttisnumber(o)
-#else
-#define cvt2str(o)	0	/* no convertion from numbers to strings */
-#endif
-
-
 LUAI_FUNC int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2);
 LUAI_FUNC int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r);
 LUAI_FUNC int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r);