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luaur_vm/functions/
str_upper.rs

1//! Node: `cxx:Function:Luau.VM:VM/src/lstrlib.cpp:71:str_upper`
2//!
3//! `string.upper` — uppercase each byte of the argument into a fresh buffer.
4
5use crate::functions::lua_l_buffinitsize::lua_l_buffinitsize;
6use crate::functions::lua_l_checklstring::lua_l_checklstring;
7use crate::functions::lua_l_pushresultsize::lua_l_pushresultsize;
8use crate::macros::uchar::uchar;
9use crate::records::lua_l_strbuf::LuaLStrbuf;
10use crate::type_aliases::lua_state::lua_State;
11use core::ffi::c_char;
12use core::ffi::c_int;
13
14pub fn str_upper(L: *mut lua_State) -> c_int {
15    unsafe {
16        let mut len: usize = 0;
17        let s = lua_l_checklstring(L, 1, &mut len);
18
19        let mut b: LuaLStrbuf = LuaLStrbuf {
20            p: core::ptr::null_mut(),
21            end: core::ptr::null_mut(),
22            L: core::ptr::null_mut(),
23            storage: core::ptr::null_mut(),
24            buffer: [0; 512],
25        };
26        let ptr = lua_l_buffinitsize(L, &mut b, len);
27
28        for i in 0..len {
29            *ptr.add(i) = (uchar(*s.add(i) as c_int) as u8).to_ascii_uppercase() as c_char;
30        }
31
32        lua_l_pushresultsize(&mut b, len);
33        1
34    }
35}