From 8adce672578683dcc7ab62e5492e0f5dbc07a0b4 Mon Sep 17 00:00:00 2001 From: Henry Gressmann Date: Fri, 26 Jan 2024 18:03:59 +0100 Subject: docs: string example Signed-off-by: Henry Gressmann --- examples/rust/src/hello.rs | 30 ++++++++++++++++++++---------- 1 file changed, 20 insertions(+), 10 deletions(-) (limited to 'examples/rust/src/hello.rs') diff --git a/examples/rust/src/hello.rs b/examples/rust/src/hello.rs index 34f3c7f..6bb6d97 100644 --- a/examples/rust/src/hello.rs +++ b/examples/rust/src/hello.rs @@ -1,18 +1,28 @@ -#![no_std] #![no_main] -#[cfg(not(test))] -#[panic_handler] -fn panic(_info: &core::panic::PanicInfo) -> ! { - core::arch::wasm32::unreachable() -} - #[link(wasm_import_module = "env")] extern "C" { - fn printi32(x: i32); + fn print_utf8(location: i32, len: i32); +} + +const ARG: &[u8] = &[0u8; 100]; + +#[no_mangle] +pub unsafe extern "C" fn arg_ptr() -> i32 { + ARG.as_ptr() as i32 } #[no_mangle] -pub unsafe extern "C" fn add_and_print(lh: i32, rh: i32) { - printi32(lh + rh); +pub unsafe extern "C" fn arg_size() -> i32 { + ARG.len() as i32 +} + +#[no_mangle] +pub unsafe extern "C" fn hello(len: i32) { + let arg = core::str::from_utf8(&ARG[0..len as usize]).unwrap(); + let res = format!("Hello, {}!", arg).as_bytes().to_vec(); + + let len = res.len() as i32; + let ptr = res.leak().as_ptr() as i32; + print_utf8(ptr, len); } -- cgit v1.3.1