diff --git a/lauxlib.c b/lauxlib.c
index 900f14b9..84f13cb4 100644
--- a/lauxlib.c
+++ b/lauxlib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lauxlib.c,v 1.152 2005/09/06 17:20:11 roberto Exp roberto $
+** $Id: lauxlib.c,v 1.153 2005/10/03 14:36:45 roberto Exp roberto $
 ** Auxiliary functions for building Lua libraries
 ** See Copyright Notice in lua.h
 */
@@ -305,7 +305,7 @@ LUALIB_API int luaL_getn (lua_State *L, int t) {
   if ((n = checkint(L, 2)) >= 0) return n;
   lua_getfield(L, t, "n");  /* else try t.n */
   if ((n = checkint(L, 1)) >= 0) return n;
-  return lua_objlen(L, t);
+  return (int)lua_objlen(L, t);
 }
 
 #endif
@@ -470,7 +470,7 @@ LUALIB_API int luaL_ref (lua_State *L, int t) {
     lua_rawseti(L, t, FREELIST_REF);  /* (t[FREELIST_REF] = t[ref]) */
   }
   else {  /* no free elements */
-    ref = lua_objlen(L, t);
+    ref = (int)lua_objlen(L, t);
     ref++;  /* create new reference */
   }
   lua_rawseti(L, t, ref);
diff --git a/ldblib.c b/ldblib.c
index 3ee8631b..6aad5751 100644
--- a/ldblib.c
+++ b/ldblib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldblib.c,v 1.100 2005/08/15 14:12:32 roberto Exp roberto $
+** $Id: ldblib.c,v 1.101 2005/08/26 17:36:32 roberto Exp roberto $
 ** Interface from Lua to its debug API
 ** See Copyright Notice in lua.h
 */
@@ -319,7 +319,7 @@ static int db_errorfb (lua_State *L) {
   lua_State *L1 = getthread(L, &arg);
   lua_Debug ar;
   if (lua_isnumber(L, arg+2)) {
-    level = lua_tointeger(L, arg+2);
+    level = (int)lua_tointeger(L, arg+2);
     lua_pop(L, 1);
   }
   else
diff --git a/liolib.c b/liolib.c
index e723b656..eb4df497 100644
--- a/liolib.c
+++ b/liolib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: liolib.c,v 2.67 2005/08/26 17:36:32 roberto Exp roberto $
+** $Id: liolib.c,v 2.68 2005/10/14 16:24:11 roberto Exp roberto $
 ** Standard I/O (and system) library
 ** See Copyright Notice in lua.h
 */
@@ -424,7 +424,7 @@ static int f_seek (lua_State *L) {
   static const char *const modenames[] = {"set", "cur", "end", NULL};
   FILE *f = tofile(L);
   int op = luaL_checkoption(L, 2, "cur", modenames);
-  lua_Integer offset = luaL_optinteger(L, 3, 0);
+  long offset = luaL_optlong(L, 3, 0);
   op = fseek(f, offset, mode[op]);
   if (op)
     return pushresult(L, 0, NULL);  /* error */
diff --git a/lstrlib.c b/lstrlib.c
index faf0f0f4..de01678b 100644
--- a/lstrlib.c
+++ b/lstrlib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lstrlib.c,v 1.123 2005/08/26 17:36:32 roberto Exp roberto $
+** $Id: lstrlib.c,v 1.124 2005/09/19 13:49:12 roberto Exp roberto $
 ** Standard library for string operations and pattern-matching
 ** See Copyright Notice in lua.h
 */
@@ -111,7 +111,9 @@ static int str_byte (lua_State *L) {
   if (posi <= 0) posi = 1;
   if ((size_t)pose > l) pose = l;
   if (posi > pose) return 0;  /* empty interval; return no values */
-  n = pose -  posi + 1;
+  n = (int)(pose -  posi + 1);
+  if (posi + n <= pose)  /* overflow? */
+    luaL_error(L, "string slice too long");
   luaL_checkstack(L, n, "string slice too long");
   for (i=0; i<n; i++)
     lua_pushinteger(L, uchar(s[posi+i-1]));