Skip to main content

luaur_vm/functions/
math_log.rs

1use crate::functions::lua_l_checknumber::lua_l_checknumber;
2use crate::functions::lua_pushnumber::lua_pushnumber;
3use crate::macros::lua_isnoneornil::lua_isnoneornil;
4use crate::type_aliases::lua_state::lua_State;
5
6pub unsafe fn math_log(l: *mut lua_State) -> i32 {
7    let x = lua_l_checknumber(l, 1);
8    let res = if lua_isnoneornil!(l, 2) {
9        x.ln()
10    } else {
11        let base = lua_l_checknumber(l, 2);
12        if base == 2.0 {
13            x.log2()
14        } else if base == 10.0 {
15            x.log10()
16        } else {
17            x.ln() / base.ln()
18        }
19    };
20
21    lua_pushnumber(l, res);
22    1
23}