Function last_error

wasm-pdk/src/lib.rs:145–161

Drain the host's stashed error after a 1-returning `edge_op`; never returns `None`.

()

/// Drain the host's stashed error after a 1-returning `edge_op`; never returns `None`.
pub fn last_error() -> Error {
    let mut kind: u32 = 2;
    let mut buf = alloc::vec![0u8; 256];
    loop {
        let r = unsafe {
            edge_take_error(&mut kind as *mut u32, buf.as_mut_ptr(), buf.len() as u32)
        };
        if r >= 0 {
            buf.truncate(r as usize);
            let msg = String::from_utf8_lossy(&buf).into_owned();
            return Error::from_kind(kind, msg);
        }
        if r == -1 { return Error::Runtime(String::from("native error: no message")); }
        // Negative = -needed; resize and retry.
        buf.resize((-r) as usize, 0);
    }
}

/* Handle (RAII) */