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#![allow(unsafe_code)]
use crate::backend::fd::{AsFd, AsRawFd};
use crate::ffi::CStr;
#[cfg(feature = "std")]
use core::fmt;
use core::fmt::Write;
use itoa::{Buffer, Integer};
#[cfg(feature = "std")]
use std::ffi::OsStr;
#[cfg(feature = "std")]
#[cfg(unix)]
use std::os::unix::ffi::OsStrExt;
#[cfg(feature = "std")]
#[cfg(target_os = "wasi")]
use std::os::wasi::ffi::OsStrExt;
#[cfg(feature = "std")]
use std::path::Path;
#[derive(Clone)]
pub struct DecInt {
buf: [u8; 20 + 1],
len: usize,
}
impl DecInt {
#[inline]
pub fn new<Int: Integer>(i: Int) -> Self {
let mut me = DecIntWriter(Self {
buf: [0; 20 + 1],
len: 0,
});
let mut buf = Buffer::new();
me.write_str(buf.format(i)).unwrap();
me.0
}
#[inline]
pub fn from_fd<Fd: AsFd>(fd: Fd) -> Self {
Self::new(fd.as_fd().as_raw_fd())
}
#[inline]
pub fn as_str(&self) -> &str {
unsafe { core::str::from_utf8_unchecked(self.as_bytes()) }
}
#[inline]
pub fn as_c_str(&self) -> &CStr {
let bytes_with_nul = &self.buf[..=self.len];
debug_assert!(CStr::from_bytes_with_nul(bytes_with_nul).is_ok());
unsafe { CStr::from_bytes_with_nul_unchecked(bytes_with_nul) }
}
#[inline]
pub fn as_bytes(&self) -> &[u8] {
&self.buf[..self.len]
}
}
struct DecIntWriter(DecInt);
impl core::fmt::Write for DecIntWriter {
#[inline]
fn write_str(&mut self, s: &str) -> core::fmt::Result {
match self.0.buf.get_mut(self.0.len..self.0.len + s.len()) {
Some(slice) => {
slice.copy_from_slice(s.as_bytes());
self.0.len += s.len();
Ok(())
}
None => Err(core::fmt::Error),
}
}
}
#[cfg(feature = "std")]
impl AsRef<Path> for DecInt {
#[inline]
fn as_ref(&self) -> &Path {
let as_os_str: &OsStr = OsStrExt::from_bytes(&self.buf[..self.len]);
Path::new(as_os_str)
}
}
#[cfg(feature = "std")]
impl fmt::Debug for DecInt {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
self.as_str().fmt(fmt)
}
}