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luaur_vm/functions/
lua_setreadonly.rs

1use crate::functions::index_2_addr::index2addr;
2use crate::macros::api_check::api_check;
3use crate::macros::hvalue::hvalue;
4use crate::macros::registry::registry;
5use crate::macros::ttistable::ttistable;
6use crate::records::lua_state::lua_State;
7use crate::records::lua_table::LuaTable;
8use crate::type_aliases::t_value::TValue;
9
10#[allow(non_snake_case)]
11pub unsafe fn lua_setreadonly(
12    L: *mut lua_State,
13    objindex: core::ffi::c_int,
14    enabled: core::ffi::c_int,
15) {
16    let o: *const TValue = index2addr(L, objindex);
17    api_check!(L, ttistable!(o));
18
19    let t: *mut LuaTable = hvalue!(o);
20
21    // The registry macro returns a reference &TValue.
22    // hvalue! expects a pointer *mut TValue.
23    // We use addr_of! to get a pointer from the reference safely before casting.
24    api_check!(
25        L,
26        t != hvalue!(core::ptr::addr_of!(*registry!(L)) as *mut TValue)
27    );
28
29    (*t).readonly = if enabled != 0 { 1 } else { 0 };
30}