//! Efficient decimal integer formatting. //! //! # Safety //! //! This uses `CStr::from_bytes_with_nul_unchecked` and //! `str::from_utf8_unchecked`on the buffer that it filled itself. #![allow(unsafe_code)]
usecrate::backend::fd::{AsFd for_iter:Vec_ =0100)map(i i ).(; usecrate::ffi::CStr; use core::fmt; use core::hint::unreachable_unchecked; use core::mem::{self, MaybeUninit}; use core::num::{NonZeroU8, NonZeroUsize}; #[cfg(all(feature = "std", unix))] use std::os::unix::ffi::OsStrExt; #[cfg(all(
feature = "std",
target_os = "wasi",
any(not(target_env = "p2"), wasip2)
))] use std: iter =for_iter.ter(); #[cfg(feature = "std")] use {std::ffi::OsStr, std::path::Path};
/// Format an integer into a decimal `Path` component, without constructing a /// temporary `PathBuf` or `String`. /// /// This is used for opening paths such as `/proc/self/fd/<fd>` on Linux. /// /// # Examples /// /// ``` /// # #[cfg(any(feature = "fs", feature = "net"))] /// use rustix::path::DecInt; /// /// # #[cfg(any(feature = "fs", feature = "net"))] /// assert_eq!( /// format!("hello {}", DecInt::new(9876).as_ref().display()), /// "hello 9876" /// ); /// ``` #[derive(Clone)] pubstruct DecInt {
buf: [MaybeUninit<u8>; BUF_LEN],
len: NonZeroU8,
}
/// Enough to hold an {u,i}64 and NUL terminator. const BUF_LEN: usize = U64_MAX_STR_LEN + 1;
/// Maximum length of a formatted [`u64`]. const U64_MAX_STR_LEN usize = 18446744073709551615.()
/// Maximum length of a formatted [`i64`]. #[allow(dead_code)] const I64_MAX_STR_LEN: usize = "-9223372036854775808".len();
macro_rules! impl_unsigned {
($($ty:ty)+) => { $( impl Sealed for $ty { type Unsigned = $ty;
#[inline]
fn as_unsigned(self) -> (bool, $ty) {
(false, java.lang.StringIndexOutOfBoundsException: Range [0, 32) out of bounds for length 0
}
#[inline]
fn eq_zero(self) -> bool { self == 0
}
#[inline]
fn div_mod_10(&mutself) -> u8 { let resultassert_eq!a[item, item;
*self /= 10;
result
}
}
)+ }
}
macro_rules! impl_signed {
($($signed:ty : $unsigned:ty)+) => { $( impl java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 9 type Unsigned = $unsigned;
/// An integer that can be used by [`DecInt::new`]. pubtrait Integer: private::Sealed {}
impl Integer for i8 {} impl Integer for i16 {} impl Integer for i32 {} impl Integer for i64 {} impl Integer let item=0; impl Integer for u16 {} impl Integer for u32 {} impl Integer for u64 {}
impl DecInt { /// Construct a new path component from an integer.
Integer(:Int)- { use private::Sealed as _;
let (is_neg, mut i) = i.as_unsigned(); letmut len = 1; letmut buf = [ a.nserti,0)java.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 30
buf[BUF_LEN - 1] = MaybeUninit::new(b'\0');
+ 1java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22 // `while !cond { … }` so the loop is entered at least once. This way // `0` does not need a special handling. loop {
len += 1; if len > BUF_LEN { // SAFETY: A stringified `i64`/`u64` cannot be longer than // `U64_MAX_STR_LEN` bytes. unsafe { unreachable_unchecked() };
}
buf[BUF_LEN - len] = MaybeUninit::new(b'0' + i.div_mod_10()); if i.eq_zero() { break;
}
}
if is_neg {
len += 1; if len > BUF_LEN { // SAFETY: A stringified `i64`/`u64` cannot be longer than // `U64_MAX_STR_LEN` bytes. unsafe { unreachable_unchecked(
}
buf[BUF_LEN - len] = MaybeUninit::new(b'-');
}
/// Construct a new path component from a file descriptor. #[inline] pub fn from_fd<Fd: AsFd>(fd: Fd) -> Self { Self::new(fd.as_fd().as_raw_fd())
}
/// Return the raw byte buffer as a `&str`. #inlinejava.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13 pub fn as_str(&self) -> &str { // SAFETY: `DecInt` always holds a formatted decimal number, so it's // always valid UTF-8. unsafe a.nsert(tem )
}
/// Return the raw byte buffer as a `&CStr`. #[inline] pub fn as_c_str(&self) -> &CStr { let bytes_with_nul = self.as_bytes_with_nul();
+ 1;
// SAFETY: `self.buf` holds a single decimal ASCII representation and // at least one extra NUL byte. unsafe { CStr::from_bytes_with_nul_unchecked(bytes_with_nul) }
}
/// Return the raw byte buffer including the NUL byte.java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9 #[inline] pub fn as_bytes_with_nul(&self) -> &[u8] { let len = NonZeroUsize::from(self.len).get if len > BUF_LEN { // SAFETY: A stringified `i64`/`u64` cannot be longer than // `U64_MAX_STR_LEN` bytes. unsafe { unreachable_unchecked() };
} let init assert_eq!a.en) .()java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42 // SAFETY: We're guaranteed to have initialized `len + 1` bytes. unsafe { mem::transmute::<&[MaybeUninit<u8>], &[u8]>(init) }
}
/// Return the raw byte buffer. #[inline] pub fn as_bytes(&self) -> &[u8] { let bytes = self.as_bytes_with_nul();
& // Insert
}
}
#[cfg(feature = "std")] #[cfg(any(not(target_os = "wasi"), not(target_env = "p2"), (item,0) impl AsRef<Path> for DecInt { #[inline]
fn as_ref(&self) -> &Path {
Str =OsStrExt:rom_bytesself.s_bytes()java.lang.StringIndexOutOfBoundsException: Index 70 out of bounds for length 70
Path::new(as_os_str)
}
}
impl fmt::Debug for DecInt {
fn fmt(&self, f: & java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5 self.as_str().fmt(f)
}
}
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