[rustc.git] / src / test / ui / foreign / foreign-fn-linkname.rs

// run-pass
// ignore-wasm32-bare no libc to test ffi with
// ignore-sgx no libc

#![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);
}
Commit	Line	Data
b7449926	1	// run-pass
abe05a73	2	// ignore-wasm32-bare no libc to test ffi with
48663c56	3	// ignore-sgx no libc
c34b1796	4
0731742a	5	#![feature(rustc_private)]
970d7e83	6
1a4d82fc JJ	7	extern crate libc;
1a4d82fc JJ	8	use std::ffi::CString;
223e47cc	9
1a4d82fc JJ	10	mod mlibc {
	11	use libc::{c_char, size_t};
	12
5869c6ff	13	extern "C" {
223e47cc	14	#[link_name = "strlen"]
1a4d82fc	15	pub fn my_strlen(str: *const c_char) -> size_t;
223e47cc LB	16	}
	17	}
	18
c34b1796	19	fn strlen(str: String) -> usize {
1a4d82fc	20	// C string is terminated with a zero
85aaf69f	21	let s = CString::new(str).unwrap();
5869c6ff	22	unsafe { mlibc::my_strlen(s.as_ptr()) as usize }
223e47cc LB	23	}
	24
	25	pub fn main() {
1a4d82fc	26	let len = strlen("Rust".to_string());
c34b1796	27	assert_eq!(len, 4);
223e47cc	28	}