core/io/io_slice/
repr_iovec.rs

1use crate::ffi::c_void;
2use crate::marker::PhantomData;
3use crate::slice;
4
5#[derive(#[automatically_derived]
impl crate::marker::Copy for iovec { }Copy, #[automatically_derived]
impl crate::clone::Clone for iovec {
    #[inline]
    fn clone(&self) -> iovec {
        let _: crate::clone::AssertParamIsClone<*mut c_void>;
        let _: crate::clone::AssertParamIsClone<usize>;
        *self
    }
}Clone)]
6#[repr(C)]
7struct iovec {
8    iov_base: *mut c_void,
9    iov_len: usize,
10}
11
12#[derive(#[automatically_derived]
impl<'a> crate::marker::Copy for IoSlice<'a> { }Copy, #[automatically_derived]
impl<'a> crate::clone::Clone for IoSlice<'a> {
    #[inline]
    fn clone(&self) -> IoSlice<'a> {
        let _: crate::clone::AssertParamIsClone<iovec>;
        let _: crate::clone::AssertParamIsClone<PhantomData<&'a [u8]>>;
        *self
    }
}Clone)]
13#[repr(transparent)]
14pub(crate) struct IoSlice<'a> {
15    vec: iovec,
16    _p: PhantomData<&'a [u8]>,
17}
18
19impl<'a> IoSlice<'a> {
20    #[inline]
21    pub(crate) 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(crate) fn advance(&mut self, n: usize) {
30        if self.vec.iov_len < n {
31            {
    crate::panicking::panic_fmt(format_args!("advancing IoSlice beyond its length"));
};panic!("advancing IoSlice beyond its length");
32        }
33
34        // SAFETY:
35        //  * `n <= iov_len` as asserted above.
36        //  * The allocation pointed to by `iov_base` is valid up to `iov_base + iov_len`.
37        unsafe {
38            self.vec.iov_len -= n;
39            self.vec.iov_base = self.vec.iov_base.add(n);
40        }
41    }
42
43    #[inline]
44    pub(crate) const fn as_slice(&self) -> &'a [u8] {
45        // SAFETY:
46        //  * `iov_base` and `iov_len` come from a prior decomposition of a valid slice.
47        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
48    }
49}
50
51#[repr(transparent)]
52pub(crate) struct IoSliceMut<'a> {
53    vec: iovec,
54    _p: PhantomData<&'a mut [u8]>,
55}
56
57impl<'a> IoSliceMut<'a> {
58    #[inline]
59    pub(crate) fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> {
60        IoSliceMut {
61            vec: iovec { iov_base: buf.as_mut_ptr() as *mut c_void, iov_len: buf.len() },
62            _p: PhantomData,
63        }
64    }
65
66    #[inline]
67    pub(crate) fn advance(&mut self, n: usize) {
68        if self.vec.iov_len < n {
69            {
    crate::panicking::panic_fmt(format_args!("advancing IoSliceMut beyond its length"));
};panic!("advancing IoSliceMut beyond its length");
70        }
71
72        // SAFETY:
73        //  * `n <= iov_len` as asserted above.
74        //  * The allocation pointed to by `iov_base` is valid up to `iov_base + iov_len`.
75        unsafe {
76            self.vec.iov_len -= n;
77            self.vec.iov_base = self.vec.iov_base.add(n);
78        }
79    }
80
81    #[inline]
82    pub(crate) fn as_slice(&self) -> &[u8] {
83        // SAFETY:
84        //  * `iov_base` and `iov_len` come from a prior decomposition of a valid slice.
85        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) }
86    }
87
88    #[inline]
89    pub(crate) const fn into_slice(self) -> &'a mut [u8] {
90        // SAFETY:
91        //  * `iov_base` and `iov_len` come from a prior decomposition of a valid slice.
92        unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
93    }
94
95    #[inline]
96    pub(crate) fn as_mut_slice(&mut self) -> &mut [u8] {
97        // SAFETY:
98        //  * `iov_base` and `iov_len` come from a prior decomposition of a valid slice.
99        unsafe { slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len) }
100    }
101}
core/io/io_slice/repr_iovec.rs

core/io/io_slice/
repr_iovec.rs
