std/sys/io/io_slice/
iovec.rs

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1#[cfg(target_os = "hermit")]
2use hermit_abi::iovec;
3#[cfg(target_family = "unix")]
4use libc::iovec;
5
6use crate::ffi::c_void;
7use crate::marker::PhantomData;
8use crate::slice;
9#[cfg(target_os = "solid_asp3")]
10use crate::sys::pal::abi::sockets::iovec;
11
12#[derive(Copy, Clone)]
13#[repr(transparent)]
14pub struct IoSlice<'a> {
15    vec: iovec,
16    _p: PhantomData<&'a [u8]>,
17}
18
19impl<'a> IoSlice<'a> {
20    #[inline]
21    pub fn new(buf: &'a [u8]) -> IoSlice<'a> {
22        IoSlice {
23            vec: iovec { iov_base: buf.as_ptr() as *mut u8 as *mut c_void, iov_len: buf.len() },
24            _p: PhantomData,
25        }
26    }
27
28    #[inline]
29    pub fn advance(&mut self, n: usize) {
30        if self.vec.iov_len < n {
31            panic!("advancing IoSlice beyond its length");
32        }
33
34        unsafe {
35            self.vec.iov_len -= n;
36            self.vec.iov_base = self.vec.iov_base.add(n);
37        }
38    }
39
40    #[inline]
41    pub const fn as_slice(&self) -> &'a [u8] {
42        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
43    }
44}
45
46#[repr(transparent)]
47pub struct IoSliceMut<'a> {
48    vec: iovec,
49    _p: PhantomData<&'a mut [u8]>,
50}
51
52impl<'a> IoSliceMut<'a> {
53    #[inline]
54    pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> {
55        IoSliceMut {
56            vec: iovec { iov_base: buf.as_mut_ptr() as *mut c_void, iov_len: buf.len() },
57            _p: PhantomData,
58        }
59    }
60
61    #[inline]
62    pub fn advance(&mut self, n: usize) {
63        if self.vec.iov_len < n {
64            panic!("advancing IoSliceMut beyond its length");
65        }
66
67        unsafe {
68            self.vec.iov_len -= n;
69            self.vec.iov_base = self.vec.iov_base.add(n);
70        }
71    }
72
73    #[inline]
74    pub fn as_slice(&self) -> &[u8] {
75        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
76    }
77
78    #[inline]
79    pub const fn into_slice(self) -> &'a mut [u8] {
80        unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
81    }
82
83    #[inline]
84    pub fn as_mut_slice(&mut self) -> &mut [u8] {
85        unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
86    }
87}
std/sys/io/io_slice/iovec.rs

std/sys/io/io_slice/
iovec.rs
