luaur-vm 0.1.1

The Luau register virtual machine and standard library (Rust).
Documentation 
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use crate::macros::luai_num_2_unsigned::luai_num2unsigned;
use crate::macros::nvalue::nvalue;
use crate::macros::setnvalue::setnvalue;
use crate::macros::ttisnumber::ttisnumber;
use crate::type_aliases::lua_state::LuaState;
use crate::type_aliases::stk_id::StkId;
use crate::type_aliases::t_value::TValue;

#[allow(non_snake_case)]
pub unsafe fn luauF_extract(
    _l: *mut LuaState,
    res: StkId,
    arg0: *mut TValue,
    nresults: core::ffi::c_int,
    args: StkId,
    nparams: core::ffi::c_int,
) -> core::ffi::c_int {
    if nparams >= 2 && nresults <= 1 && ttisnumber!(arg0) && ttisnumber!(args) {
        let a1 = nvalue!(arg0);
        let a2 = nvalue!(args);

        let mut n: u32 = 0;
        luai_num2unsigned(&mut n, a1);
        let f = a2 as i32;

        if nparams == 2 {
            if (f as u32) < 32 {
                let m: u32 = 1;
                let r: u32 = (n >> (f as u32)) & m;

                setnvalue!(res, r as f64);
                return 1;
            }
        } else if ttisnumber!(args.offset(1)) {
            let a3 = nvalue!(args.offset(1));
            let w = a3 as i32;

            if f >= 0 && w > 0 && f + w <= 32 {
                let m: u32 = !(0xFFFF_FFFE_u32 << (w - 1));
                let r: u32 = (n >> (f as u32)) & m;

                setnvalue!(res, r as f64);
                return 1;
            }
        }
    }

    -1
}