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