69 lines
1.6 KiB
Rust
69 lines
1.6 KiB
Rust
use std::ffi;
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use std::ops::Deref;
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use smallvec::SmallVec;
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#[cfg(test)]
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mod tests;
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const SIZE: usize = 36;
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/// Like SmallVec but for C strings.
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#[derive(Clone)]
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pub struct SmallCStr {
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data: SmallVec<[u8; SIZE]>,
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}
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impl SmallCStr {
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#[inline]
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pub fn new(s: &str) -> SmallCStr {
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let len = s.len();
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let len1 = len + 1;
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let data = if len < SIZE {
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let mut buf = [0; SIZE];
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buf[..len].copy_from_slice(s.as_bytes());
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SmallVec::from_buf_and_len(buf, len1)
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} else {
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let mut data = Vec::with_capacity(len1);
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data.extend_from_slice(s.as_bytes());
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data.push(0);
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SmallVec::from_vec(data)
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};
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if let Err(e) = ffi::CStr::from_bytes_with_nul(&data) {
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panic!("The string \"{}\" cannot be converted into a CStr: {}", s, e);
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}
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SmallCStr { data }
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}
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#[inline]
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pub fn new_with_nul(s: &str) -> SmallCStr {
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let b = s.as_bytes();
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if let Err(e) = ffi::CStr::from_bytes_with_nul(b) {
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panic!("The string \"{}\" cannot be converted into a CStr: {}", s, e);
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}
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SmallCStr { data: SmallVec::from_slice(s.as_bytes()) }
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}
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#[inline]
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pub fn as_c_str(&self) -> &ffi::CStr {
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unsafe { ffi::CStr::from_bytes_with_nul_unchecked(&self.data[..]) }
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}
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#[inline]
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pub fn len_with_nul(&self) -> usize {
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self.data.len()
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}
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pub fn spilled(&self) -> bool {
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self.data.spilled()
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}
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}
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impl Deref for SmallCStr {
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type Target = ffi::CStr;
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fn deref(&self) -> &ffi::CStr {
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self.as_c_str()
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}
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}
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