javalsai
0f736b1fc4
will only check users of such group also cleaned some code: - Input doesn't need to be UTF-8 valid. - Main fuction is dead-simple, very readable. - Added some modularity. - Add some docs on behavior details.
48 lines
1.2 KiB
Rust
48 lines
1.2 KiB
Rust
use std::{
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ffi::{CStr, OsStr},
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os::unix::ffi::OsStrExt as _,
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};
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pub trait SliceExt {
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fn split_once_ch(&self, ch: u8) -> Option<(&[u8], &[u8])>;
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}
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impl SliceExt for [u8] {
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fn split_once_ch(&self, ch: u8) -> Option<(&[u8], &[u8])> {
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let (idx, _) = self.iter().enumerate().find(|(_, b)| **b == ch)?;
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// SAFETY: idx is IN-OF-BOUNDS index of the slice
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unsafe { Some((self.get_unchecked(0..idx), self.get_unchecked((idx + 1)..))) }
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}
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}
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pub trait CStrExt {
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fn to_os_str(&self) -> &OsStr;
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fn split_ch(&self, ch: u8) -> Option<(&[u8], &CStr)>;
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}
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impl CStrExt for CStr {
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fn to_os_str(&self) -> &OsStr {
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OsStr::from_bytes(self.to_bytes())
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}
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fn split_ch(&self, ch: u8) -> Option<(&[u8], &CStr)> {
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let self_slice = self.to_bytes_with_nul();
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self_slice.split_once_ch(ch).map(|(k, v)| {
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// # SAFETY split originated in a slice with final null byte, hence second split will be
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// null terminated
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(k, unsafe { Self::from_bytes_with_nul_unchecked(v) })
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})
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}
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}
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pub trait StrExt {
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fn as_os_str(&self) -> &OsStr;
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}
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impl StrExt for str {
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fn as_os_str(&self) -> &OsStr {
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OsStr::from_bytes(self.as_bytes())
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}
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}
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