lancer / programs / help / src / main.rs

#![no_std]
#![no_main]

use lancer_user::path::extract_filename;
use lancer_user::{println, syscall};

const BOOT_MODULE_COUNT: u64 = 7;

#[unsafe(no_mangle)]
pub extern "C" fn lancer_main() -> ! {
    println!("Built-in commands:");
    println!("  exit    - close session");
    println!("  whoami  - show auth method");
    println!("\nAvailable programs:");

    let mut dummy = [0u8; 0];
    let total = syscall::module_info(u64::MAX, &mut dummy);

    match total > 0 {
        true => {
            let mut path_buf = [0u8; 128];
            let mut found = false;
            (BOOT_MODULE_COUNT..total as u64).for_each(|i| {
                path_buf = [0u8; 128];
                let path_len = syscall::module_info(i, &mut path_buf);
                if path_len > 0 {
                    let used = (path_len as usize).min(path_buf.len());
                    let filename = extract_filename(&path_buf[..used]);
                    if let Ok(name) = core::str::from_utf8(filename) {
                        println!("  {}", name);
                    }
                    found = true;
                }
            });
            if !found {
                println!("  (none)");
            }
        }
        false => {
            println!("  (none)");
        }
    }

    syscall::exit()
}