dope_core/io/
iovec.rs

1#[derive(Clone, Copy, Debug)]
2#[repr(transparent)]
3pub struct IoVec {
4    raw: libc::iovec,
5}
6
7impl IoVec {
8    #[must_use]
9    pub const fn empty() -> Self {
10        Self {
11            raw: libc::iovec {
12                iov_base: std::ptr::null_mut(),
13                iov_len: 0,
14            },
15        }
16    }
17
18    #[must_use]
19    pub fn from_slice(buf: &[u8], off: usize) -> Self {
20        let start = off.min(buf.len());
21        let tail = &buf[start..];
22        Self {
23            raw: libc::iovec {
24                iov_base: tail.as_ptr() as *mut libc::c_void,
25                iov_len: tail.len(),
26            },
27        }
28    }
29
30    #[inline(always)]
31    #[must_use]
32    pub fn raw(ptr: *const u8, len: usize) -> libc::iovec {
33        libc::iovec {
34            iov_base: ptr as *mut libc::c_void,
35            iov_len: len,
36        }
37    }
38
39    #[must_use]
40    pub fn from_mut_slice(buf: &mut [u8]) -> Self {
41        Self {
42            raw: libc::iovec {
43                iov_base: buf.as_mut_ptr() as *mut libc::c_void,
44                iov_len: buf.len(),
45            },
46        }
47    }
48
49    pub fn set_len(&mut self, len: usize) {
50        self.raw.iov_len = len;
51    }
52
53    pub fn len(&self) -> usize {
54        self.raw.iov_len
55    }
56
57    pub fn is_empty(&self) -> bool {
58        self.raw.iov_len == 0
59    }
60
61    pub fn as_ptr(&self) -> *const u8 {
62        self.raw.iov_base.cast()
63    }
64
65    #[inline(always)]
66    pub fn as_libc(&self) -> libc::iovec {
67        self.raw
68    }
69
70    pub fn advance(&mut self, n: usize) {
71        let step = n.min(self.raw.iov_len);
72        self.raw.iov_base = unsafe { (self.raw.iov_base as *mut u8).add(step) }.cast();
73        self.raw.iov_len -= step;
74    }
75}
dope_core/io/iovec.rs

dope_core/io/
iovec.rs
