73 lines
1.3 KiB
Rust
73 lines
1.3 KiB
Rust
#![allow(dead_code)]
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use std::ffi::{CStr, c_char};
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fn say_hello(name: &str) {
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println!("Hello from Rust, {name}!");
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}
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#[unsafe(no_mangle)]
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extern "C" fn hello(c: *const c_char) -> () {
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say_hello(unsafe { CStr::from_ptr(c) }.to_str().unwrap())
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}
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#[repr(C)]
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#[derive(Debug)]
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struct T {
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a: bool,
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b: u8,
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}
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#[unsafe(no_mangle)]
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extern "C" fn hello_struct(t: T) -> () {
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say_hello(&format!("{:?}", t))
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}
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#[repr(C)]
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#[derive(Debug)]
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enum Shape {
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Circle { radius: f64 },
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Rectangle { width: f64, height: f64 },
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}
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#[unsafe(no_mangle)]
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extern "C" fn hello_shape(s: Shape) -> () {
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say_hello(&format!("{:?}", s))
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}
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/// cbindgen:prefix=__attribute__((const))
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#[unsafe(no_mangle)]
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extern "C" fn add(a: i64, b: i64) -> i64 {
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a + b
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}
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#[repr(C)]
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enum BTreeBox {
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Leaf { value: i64 },
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Fork { left: Box<BTreeBox>, right: Box<BTreeBox> },
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}
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impl BTreeBox {
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fn sum(&self) -> i64 {
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match self {
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BTreeBox::Leaf { value } => *value,
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BTreeBox::Fork { left, right } => left.sum() + right.sum(),
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}
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}
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}
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#[repr(C)]
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enum BTree {
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Leaf {
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value: i64,
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},
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Fork {
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left: *const BTree,
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right: *const BTree,
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},
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}
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#[unsafe(no_mangle)]
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extern "C" fn sum_tree(t: BTree) -> i64 {
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(unsafe { std::mem::transmute::<_, &BTreeBox>(&t) }).sum()
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}
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