//! UTF-8 path component and transactional CWD guest probe.

use super::*;
use os_vfs_paths::{Error as PathError, PathState};

pub fn run(allocator: &mut memory::FrameAllocator) -> Result<(), &'static str> {
    let frames_before = allocator.remaining_pages();
    let mut state = PathState::new();
    let absolute = state.chdir("/veri/çalışma".as_bytes())
        .map_err(|_| "k1545-absolute")?;
    if absolute.depth() != 2 || absolute.component(1) != Some("çalışma")
        || state.generation != 1 {
        return Err("k1545-absolute-state");
    }
    let relative = state.chdir("../örnek/./belge".as_bytes())
        .map_err(|_| "k1545-relative")?;
    if relative.depth() != 3 || relative.component(0) != Some("veri")
        || relative.component(1) != Some("örnek")
        || relative.component(2) != Some("belge")
        || state.generation != 2 {
        return Err("k1545-relative-state");
    }
    let healthy = state;
    if state.chdir(&[b'/', 0xff]) != Err(PathError::InvalidUtf8)
        || state != healthy {
        return Err("k1545-invalid-UTF8-changed-CWD");
    }
    let mut deep = [0u8; 34];
    for index in 0..17 {
        deep[index * 2] = b'/';
        deep[index * 2 + 1] = b'x';
    }
    if state.chdir(&deep) != Err(PathError::TooDeep)
        || state != healthy
        || allocator.remaining_pages() != frames_before {
        return Err("k1545-deep-path-changed-CWD");
    }
    write_line("TURKOS/OS/K1545-PATHS: ABS=2 REL=3 UTF8=REJECTED DEEP=REJECTED CWD=UNCHANGED GENERATION=2 FRAMES=UNCHANGED");
    Ok(())
}