30 lines
621 B
Rust
30 lines
621 B
Rust
//ignore-windows: Uses POSIX APIs
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#![feature(rustc_private)]
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#![allow(unused_extern_crates)] // rustc bug https://github.com/rust-lang/rust/issues/56098
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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 {
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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 {
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mlibc::my_strlen(s.as_ptr()) as usize
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}
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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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