luaur-vm 0.1.0

The Luau register virtual machine and standard library (Rust).
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

use crate::functions::lua_l_checkinteger::lua_l_checkinteger;
use crate::functions::lua_l_optinteger::lua_l_optinteger;
use crate::macros::lua_l_argcheck::luaL_argcheck;
use crate::macros::lua_l_error::luaL_error;
use crate::type_aliases::lua_state::lua_State;

pub fn fieldargs(
    l: *mut lua_State,
    farg: core::ffi::c_int,
    width: *mut core::ffi::c_int,
) -> core::ffi::c_int {
    unsafe {
        let f = lua_l_checkinteger(l, farg);
        let w = lua_l_optinteger(l, farg + 1, 1);

        luaL_argcheck!(l, 0 <= f, farg, "field cannot be negative");
        luaL_argcheck!(l, 0 < w, farg + 1, "width must be positive");

        if f + w > 32 {
            luaL_error!(l, "trying to access non-existent bits");
        }

        *width = w;
        f
    }
}