luaL_checkudata with negative index
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- Subject: luaL_checkudata with negative index
- From: "Jérôme VUARAND" <jerome.vuarand@...>
- Date: Sun, 9 Apr 2006 04:04:31 -0400
Hi list,
In lua 5.1 luaL_checkudata no longer support negative indices because
it pushes something on the stack before evaluating its argument. I
noticed that because lua-tcc use it that way and it was not working
with 5.1. Here is a unified patch to bring back old behaviour of
luaL_checkudata (also in attached file) :
###
--- lauxlib.c Mon Jan 16 12:42:22 2006
+++ lauxlib.c Sun Apr 9 06:51:00 2006
@@ -123,8 +123,10 @@
LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
void *p = lua_touserdata(L, ud);
+ if (p == NULL || !lua_getmetatable(L, ud))
+ luaL_typerror(L, ud, tname);
lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get correct metatable */
- if (p == NULL || !lua_getmetatable(L, ud) || !lua_rawequal(L, -1, -2))
+ if (!lua_rawequal(L, -1, -2))
luaL_typerror(L, ud, tname);
lua_pop(L, 2); /* remove both metatables */
return p;
###
It would be nice to put it back into lua source code.
Doub.