tsuki 0.4.8

Lua 5.4 ported to 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
27
28
29
30
31
32
33
34
35
36
37
38

#![allow(non_camel_case_types, non_snake_case, unused_assignments)]
#![allow(unsafe_op_in_unsafe_fn)]

use crate::Str;
use core::ffi::c_char;

type c_int = i32;
type c_uint = u32;

#[inline(always)]
pub unsafe fn luaS_eqlngstr<A>(a: *const Str<A>, b: *const Str<A>) -> bool {
    a == b || (*a).as_bytes() == (*b).as_bytes()
}

pub unsafe fn luaS_hash(str: *const c_char, mut l: usize, seed: c_uint) -> c_uint {
    let mut h: c_uint = seed ^ l as c_uint;
    while l > 0 as c_int as usize {
        h ^= (h << 5 as c_int)
            .wrapping_add(h >> 2 as c_int)
            .wrapping_add(
                *str.offset(l.wrapping_sub(1 as c_int as usize) as isize) as u8 as c_uint,
            );
        l = l.wrapping_sub(1);
    }
    return h;
}

pub unsafe fn luaS_hashlongstr<A>(ts: *const Str<A>) -> c_uint {
    if (*ts).extra.get() as c_int == 0 as c_int {
        let s = (*ts).as_bytes();

        (*ts)
            .hash
            .set(luaS_hash(s.as_ptr().cast(), s.len(), (*ts).hash.get()));
        (*ts).extra.set(1 as c_int as u8);
    }
    return (*ts).hash.get();
}