From 4a818f068aef5c598c7af9ed5a834dee5d9a9eb6 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Thu, 18 Jun 2009 15:59:58 -0300
Subject: 'checkversion' implemented in the auxiliary library

---
 lauxlib.c | 13 +++++++++++--
 lauxlib.h |  4 +++-
 lua.c     |  4 ++--
 3 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/lauxlib.c b/lauxlib.c
index 7f7075e8..72cfe04a 100644
--- a/lauxlib.c
+++ b/lauxlib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lauxlib.c,v 1.185 2009/03/31 17:25:08 roberto Exp roberto $
+** $Id: lauxlib.c,v 1.186 2009/04/02 19:54:06 roberto Exp roberto $
 ** Auxiliary functions for building Lua libraries
 ** See Copyright Notice in lua.h
 */
@@ -649,7 +649,7 @@ static int libsize (const luaL_Reg *l) {
 
 LUALIB_API void luaL_register (lua_State *L, const char *libname,
                                const luaL_Reg *l) {
-  lua_checkversion(L);
+  luaL_checkversion(L);
   if (libname) {
     /* check whether lib already exists */
     luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1);
@@ -740,3 +740,12 @@ LUALIB_API lua_State *luaL_newstate (void) {
   return L;
 }
 
+
+LUALIB_API void luaL_checkversion_ (lua_State *L, lua_Number ver) {
+  const lua_Number *v = lua_version(L);
+  if (v != lua_version(NULL))
+    luaL_error(L, "application using two incompatible Lua VMs");
+  else if (*v != ver)
+    luaL_error(L, "application and Lua core using different Lua versions"
+                  "(%d x %d)", (int)*v, (int)ver);
+}
diff --git a/lauxlib.h b/lauxlib.h
index 819e4d27..10de3d0b 100644
--- a/lauxlib.h
+++ b/lauxlib.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lauxlib.h,v 1.94 2008/01/03 17:07:59 roberto Exp roberto $
+** $Id: lauxlib.h,v 1.95 2009/02/13 19:39:34 roberto Exp roberto $
 ** Auxiliary functions for building Lua libraries
 ** See Copyright Notice in lua.h
 */
@@ -26,6 +26,8 @@ typedef struct luaL_Reg {
 } luaL_Reg;
 
 
+LUALIB_API void (luaL_checkversion_) (lua_State *L, lua_Number ver);
+#define luaL_checkversion(L)	luaL_checkversion_(L, LUA_VERSION_NUM)
 
 LUALIB_API void (luaI_openlib) (lua_State *L, const char *libname,
                                 const luaL_Reg *l, int nup);
diff --git a/lua.c b/lua.c
index 6f490969..2c456cc1 100644
--- a/lua.c
+++ b/lua.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lua.c,v 1.171 2008/07/11 17:51:01 roberto Exp roberto $
+** $Id: lua.c,v 1.172 2009/02/19 17:15:35 roberto Exp roberto $
 ** Lua stand-alone interpreter
 ** See Copyright Notice in lua.h
 */
@@ -343,7 +343,7 @@ static int pmain (lua_State *L) {
   lua_gc(L, LUA_GCSTOP, 0);  /* stop collector during initialization */
   luaL_openlibs(L);  /* open libraries */
   lua_gc(L, LUA_GCRESTART, 0);
-  lua_checkversion(L);
+  luaL_checkversion(L);
   s->ok = (handle_luainit(L) == LUA_OK);
   if (!s->ok) return 0;
   script = collectargs(argv, &has_i, &has_v, &has_e);
-- 
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