luaur-vm 0.1.3

The Luau register virtual machine and standard library (Rust).
Documentation 
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use crate::functions::lua_l_checkbuffer::lua_l_checkbuffer;
use crate::functions::lua_l_checkinteger::lua_l_checkinteger;
use crate::functions::lua_l_optinteger::lua_l_optinteger;
use crate::macros::isoutofbounds::isoutofbounds;
use crate::macros::lua_l_error::luaL_error;
use crate::type_aliases::lua_state::lua_State;

pub fn buffer_copy(L: *mut lua_State) -> core::ffi::c_int {
    let mut tlen: usize = 0;
    let tbuf = lua_l_checkbuffer(L, 1, &mut tlen);
    let toffset = lua_l_checkinteger(L, 2);

    let mut slen: usize = 0;
    let sbuf = lua_l_checkbuffer(L, 3, &mut slen);
    let soffset = lua_l_optinteger(L, 4, 0);

    let size = lua_l_optinteger(L, 5, (slen as core::ffi::c_int) - soffset);

    if size < 0 {
        luaL_error!(L, "buffer access out of bounds");
    }

    if isoutofbounds(soffset, slen, size as usize) {
        luaL_error!(L, "buffer access out of bounds");
    }

    if isoutofbounds(toffset, tlen, size as usize) {
        luaL_error!(L, "buffer access out of bounds");
    }

    unsafe {
        core::ptr::copy(
            (sbuf as *const core::ffi::c_char).offset(soffset as isize),
            (tbuf as *mut core::ffi::c_char).offset(toffset as isize),
            size as usize,
        );
    }

    0
}