1// Copyright 2016-2019 Brian Smith.
2//
3// Permission to use, copy, modify, and/or distribute this software for any
4// purpose with or without fee is hereby granted, provided that the above
5// copyright notice and this permission notice appear in all copies.
6//
7// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
8// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
10// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
14
15//! C types.
16//!
17//! Avoid using the `libc` crate to get C types since `libc` doesn't support
18//! all the targets we need to support. It turns out that the few types we need
19//! are all uniformly defined on the platforms we care about. This will
20//! probably change if/when we support 16-bit platforms or platforms where
21//! `usize` and `uintptr_t` are different sizes.
22//!
23//! TODO(MSRV-1.64): Use `core::ffi::{c_int, c_uint}`, remove the libc
24//! compatibility testing, and remove the libc dev-dependency.
25
26// Keep in sync with the checks in base.h that verify these assumptions.
27
28#![allow(dead_code)]
29
30use core::num::NonZeroUsize;
31
32pub(crate) type int = i32;
33pub(crate) type uint = u32;
34pub(crate) type size_t = usize;
35pub(crate) type NonZero_size_t = NonZeroUsize;
36
37#[cfg(all(test, any(unix, windows)))]
38mod tests {
39 use crate::c;
40
41 #[test]
42 fn test_libc_compatible() {
43 {
44 let x: c::int = 1;
45 let _x: libc::c_int = x;
46 }
47
48 {
49 let x: c::uint = 1;
50 let _x: libc::c_uint = x;
51 }
52
53 {
54 let x: c::size_t = 1;
55 let _x: libc::size_t = x;
56 let _x: usize = x;
57 }
58 }
59}
60