blob: ea5f8d7c2ebb031c3390c1c41749a00873a2819f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
// SPDX-License-Identifier: GPL-2.0
use core::ops::Deref;
use crate::bindings;
pub struct Mode(bindings::umode_t);
impl Mode {
pub fn from_int(m: u16) -> Mode {
Mode(m)
}
pub fn as_int(&self) -> u16 {
self.0
}
}
/// A string that is guaranteed to have exactly one NUL byte, which is at the
/// end. Used for interoperability with kernel APIs that take C strings.
#[repr(transparent)]
pub struct CStr(str);
impl CStr {
/// Creates a new CStr from a str without performing any additional checks.
/// # Safety
///
/// `data` _must_ end with a NUL byte, and should only have only a single
/// NUL byte, or the string will be truncated.
pub const unsafe fn new_unchecked(data: &str) -> &CStr {
&*(data as *const str as *const CStr)
}
}
impl Deref for CStr {
type Target = str;
fn deref(&self) -> &str {
&self.0
}
}
/// Creates a new `CStr` from a string literal. The string literal should not contain any NUL
/// bytes. Example usage:
/// ```
/// const MY_CSTR: &CStr = cstr!("My awesome CStr!");
/// ```
#[macro_export]
macro_rules! cstr {
($str:expr) => {{
let s = concat!($str, "\x00");
unsafe { $crate::CStr::new_unchecked(s) }
}};
}
|