serde/
format.rs

1use crate::lib::fmt::{self, Write};
2use crate::lib::str;
3
4pub(super) struct Buf<'a> {
5    bytes: &'a mut [u8],
6    offset: usize,
7}
8
9impl<'a> Buf<'a> {
10    pub fn new(bytes: &'a mut [u8]) -> Self {
11        Buf { bytes, offset: 0 }
12    }
13
14    pub fn as_str(&self) -> &str {
15        let slice = &self.bytes[..self.offset];
16        unsafe { str::from_utf8_unchecked(slice) }
17    }
18}
19
20impl<'a> Write for Buf<'a> {
21    fn write_str(&mut self, s: &str) -> fmt::Result {
22        if self.offset + s.len() > self.bytes.len() {
23            Err(fmt::Error)
24        } else {
25            self.bytes[self.offset..self.offset + s.len()].copy_from_slice(s.as_bytes());
26            self.offset += s.len();
27            Ok(())
28        }
29    }
30}
serde/format.rs

serde/
format.rs
