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luaur_vm/functions/
lua_getupvalue.rs

1use core::ffi::c_char;
2use core::ffi::c_int;
3
4use crate::functions::aux_upvalue::aux_upvalue;
5use crate::functions::index_2_addr::index2addr;
6use crate::functions::lua_concat::lua_c_threadbarrier_lapi;
7use crate::macros::api_incr_top::api_incr_top;
8use crate::macros::setobj_2_s::setobj2s;
9use crate::records::lua_state::lua_State;
10use crate::type_aliases::t_value::TValue;
11
12#[allow(non_snake_case)]
13pub unsafe fn lua_getupvalue(L: *mut lua_State, funcindex: c_int, n: c_int) -> *const c_char {
14    lua_c_threadbarrier_lapi(L);
15    let mut val: *mut TValue = core::ptr::null_mut();
16    let name: *const c_char = aux_upvalue(index2addr(L, funcindex), n, &mut val);
17
18    if !name.is_null() {
19        setobj2s!(L, (*L).top, val);
20        api_incr_top!(L);
21    }
22
23    name
24}