Function print

example_projects/wasm32_without_js/wasm-runtime/src/main.rs:75–85

p and l are the message pointer and length in wasm memory.

(mut ctx: FunctionEnvMut<Ctx>, p: i32, l: i32)

// p and l are the message pointer and length in wasm memory.
fn print(mut ctx: FunctionEnvMut<Ctx>, p: i32, l: i32) -> i32 {
    let (c, s) = ctx.data_and_store_mut();
    let mut msg = vec![0u8; l as usize];
    let m = c.mem.as_ref().unwrap().view(&s);
    if m.read(p as u64, &mut msg).is_err() {
        return -1;
    }
    let s = std::str::from_utf8(&msg).expect("print got non-utf8 str");
    println!("{s}");
    0
}

fn main() {
    let mut store = Store::default();