new constant 'MAX_SIZE', distinct from 'MAX_SIZET', for sizes visible

from Lua; these must fit in a lua_Integer

llex.c

@@ -1,5 +1,5 @@
 /*
-** $Id: llex.c,v 2.65 2013/04/26 13:07:53 roberto Exp roberto $
+** $Id: llex.c,v 2.66 2013/05/14 15:59:04 roberto Exp roberto $
 ** Lexical Analyzer
 ** See Copyright Notice in lua.h
 */
@@ -53,7 +53,7 @@ static void save (LexState *ls, int c) {
   Mbuffer *b = ls->buff;
   if (luaZ_bufflen(b) + 1 > luaZ_sizebuffer(b)) {
     size_t newsize;
-    if (luaZ_sizebuffer(b) >= MAX_SIZET/2)
+    if (luaZ_sizebuffer(b) >= MAX_SIZE/2)
       lexerror(ls, "lexical element too long", 0);
     newsize = luaZ_sizebuffer(b) * 2;
     luaZ_resizebuffer(ls->L, b, newsize);

llimits.h

@@ -1,5 +1,5 @@
 /*
-** $Id: llimits.h,v 1.106 2013/05/27 12:43:37 roberto Exp roberto $
+** $Id: llimits.h,v 1.107 2013/05/29 14:04:15 roberto Exp roberto $
 ** Limits, basic types, and some other `installation-dependent' definitions
 ** See Copyright Notice in lua.h
 */
@@ -27,8 +27,14 @@ typedef LUAI_MEM l_mem;
 typedef unsigned char lu_byte;
 
 
+/* maximum value for size_t */
 #define MAX_SIZET	((size_t)(~(size_t)0)-2)
 
+/* maximum size visible for Lua (must be representable in a lua_Integer */
+#define MAX_SIZE	(sizeof(size_t) <= sizeof(lua_Integer) ? MAX_SIZET \
+                          : (size_t)(~(lua_Unsigned)0)-2)
+
+
 #define MAX_LUMEM	((lu_mem)(~(lu_mem)0)-2)
 
 #define MAX_LMEM	((l_mem) ((MAX_LUMEM >> 1) - 2))

lstring.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lstring.c,v 2.25 2012/10/02 17:41:50 roberto Exp roberto $
+** $Id: lstring.c,v 2.26 2013/01/08 13:50:10 roberto Exp roberto $
 ** String table (keeps all strings handled by Lua)
 ** See Copyright Notice in lua.h
 */
@@ -157,7 +157,7 @@ TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {
   if (l <= LUAI_MAXSHORTLEN)  /* short string? */
     return internshrstr(L, str, l);
   else {
-    if (l + 1 > (MAX_SIZET - sizeof(TString))/sizeof(char))
+    if (l + 1 > (MAX_SIZE - sizeof(TString))/sizeof(char))
       luaM_toobig(L);
     return createstrobj(L, str, l, LUA_TLNGSTR, G(L)->seed, NULL);
   }
@@ -174,7 +174,7 @@ TString *luaS_new (lua_State *L, const char *str) {
 
 Udata *luaS_newudata (lua_State *L, size_t s, Table *e) {
   Udata *u;
-  if (s > MAX_SIZET - sizeof(Udata))
+  if (s > MAX_SIZE - sizeof(Udata))
     luaM_toobig(L);
   u = &luaC_newobj(L, LUA_TUSERDATA, sizeof(Udata) + s, NULL, 0)->u;
   u->uv.len = s;

lvm.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lvm.c,v 2.172 2013/06/04 19:36:42 roberto Exp roberto $
+** $Id: lvm.c,v 2.173 2013/06/07 19:02:05 roberto Exp roberto $
 ** Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -284,7 +284,7 @@ void luaV_concat (lua_State *L, int total) {
       /* collect total length */
       for (i = 1; i < total && tostring(L, top-i-1); i++) {
         size_t l = tsvalue(top-i-1)->len;
-        if (l >= (MAX_SIZET/sizeof(char)) - tl)
+        if (l >= (MAX_SIZE/sizeof(char)) - tl)
           luaG_runerror(L, "string length overflow");
         tl += l;
       }