mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-15 01:55:03 +00:00
32 lines
658 B
Rust
32 lines
658 B
Rust
// run-pass
|
|
// ignore-wasm32-bare no libc to test ffi with
|
|
// ignore-sgx no libc
|
|
|
|
// Ensure no false positive on "unused extern crate" lint
|
|
#![deny(unused_extern_crates)]
|
|
|
|
#![feature(rustc_private)]
|
|
|
|
extern crate libc;
|
|
use std::ffi::CString;
|
|
|
|
mod mlibc {
|
|
use libc::{c_char, size_t};
|
|
|
|
extern "C" {
|
|
#[link_name = "strlen"]
|
|
pub fn my_strlen(str: *const c_char) -> size_t;
|
|
}
|
|
}
|
|
|
|
fn strlen(str: String) -> usize {
|
|
// C string is terminated with a zero
|
|
let s = CString::new(str).unwrap();
|
|
unsafe { mlibc::my_strlen(s.as_ptr()) as usize }
|
|
}
|
|
|
|
pub fn main() {
|
|
let len = strlen("Rust".to_string());
|
|
assert_eq!(len, 4);
|
|
}
|