Calling Lua from C

[Chris <coderight@...>]

Hi, I'm fairly new to Lua and this issue is driving me insane. 
I'm trying to call table.getn() from C which seems to work on the Lua
side but not inside the C code (see below).  Here is the code in
question:

First the C function:

static int TestCall(lua_State* L)
{
   lua_pushstring(L, "table");
   lua_gettable(L, LUA_GLOBALSINDEX);
   lua_pushstring(L, "getn");
   lua_gettable(L, -2);
   lua_pushvalue(L, 1);
   lua_call(L, 1, 1);
   lua_remove(L, -2);

   printf("c_num: %d, %d\n", lua_isnumber(L, -1), lua_tonumber(L, -1));
   return 1;
}

And the Lua code:

sometable = {}
sometable[1] = 1;
sometable[2] = 2;
print(TestCall(sometable))

Now what this prints out when run is:

c_num: 1, 5
2

Meaning the stack value for the number of elements is 5 on the C side
but magically turns into the correct value of 2 back in Lua.  WTF?

Thanks for any help...