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luaur_vm/functions/
lua_setuserdatatag.rs

1use crate::functions::index_2_addr::index2addr;
2use crate::macros::api_check::api_check;
3use crate::macros::lua_utag_limit::LUA_UTAG_LIMIT;
4use crate::macros::ttisuserdata::ttisuserdata;
5use crate::records::udata::Udata;
6use crate::type_aliases::lua_state::lua_State;
7use crate::type_aliases::stk_id::StkId;
8
9#[allow(non_snake_case)]
10pub unsafe fn lua_setuserdatatag(L: *mut lua_State, idx: core::ffi::c_int, tag: core::ffi::c_int) {
11    api_check!(L, (tag as u32) < LUA_UTAG_LIMIT as u32);
12    let o: StkId = index2addr(L, idx);
13    api_check!(L, ttisuserdata!(o));
14    let u = core::ptr::addr_of_mut!((*(*o).value.gc).u) as *mut Udata;
15    (*u).tag = tag as u8;
16}