Function lua_touserdata

third-party/lua-5.2.4/src/lapi.c:427–434

LUA_API void *lua_touserdata (lua_State *L, int idx) {
  StkId o = index2addr(L, idx);
  switch (ttypenv(o)) {
    case LUA_TUSERDATA: return (rawuvalue(o) + 1);
    case LUA_TLIGHTUSERDATA: return pvalue(o);
    default: return NULL;
  }
}


LUA_API lua_State *lua_tothread (lua_State *L, int idx) {