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extern crate libc;
use std::fmt;
use std::ffi::CString;
use libc::{c_int, c_char};
mod ffi {
use libc::{c_int, c_char, size_t};
#[link(name = "nixtest", kind = "static")]
extern {
pub fn get_int_const(errno: *const c_char) -> c_int;
pub fn size_of(ty: *const c_char) -> size_t;
}
}
pub fn assert_const_eq<T: GetConst>(name: &str, actual: T) {
unsafe {
let cstr = CString::new(name).unwrap();
let expect = GetConst::get_const(cstr.as_ptr());
if actual != expect {
panic!("incorrect value for errno {}; expect={}; actual={}",
name, expect, actual);
}
}
}
pub fn assert_size_of<T>(name: &str) {
use std::mem;
unsafe {
let cstr = CString::new(name).unwrap();
let expect = ffi::size_of(cstr.as_ptr()) as usize;
assert!(expect > 0, "undefined type {}", name);
if mem::size_of::<T>() != expect {
panic!("incorrectly sized type; expect={}; actual={}",
expect, mem::size_of::<T>());
}
}
}
pub trait GetConst : PartialEq<Self> + fmt::Display {
unsafe fn get_const(name: *const c_char) -> Self;
}
impl GetConst for c_int {
unsafe fn get_const(name: *const c_char) -> c_int {
ffi::get_int_const(name)
}
}
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