Method hello_string

crates/wiggle/tests/strings.rs:12–23

(
        &mut self,
        memory: &mut GuestMemory<'_>,
        a_string: GuestPtr<str>,
    )

impl<'a> strings::Strings for WasiCtx<'a> {
    fn hello_string(
        &mut self,
        memory: &mut GuestMemory<'_>,
        a_string: GuestPtr<str>,
    ) -> Result<u32, types::Errno> {
        let s = memory
            .as_str(a_string)
            .expect("should be valid string")
            .expect("expected non-shared memory");
        println!("a_string='{}'", &*s);
        Ok(s.len() as u32)
    }

    fn multi_string(
        &mut self,