ntex_bytes/
debug.rs

1use std::fmt;
2
3/// Alternative implementation of `fmt::Debug` for byte slice.
4///
5/// Standard `Debug` implementation for `[u8]` is comma separated
6/// list of numbers. Since large amount of byte strings are in fact
7/// ASCII strings or contain a lot of ASCII strings (e. g. HTTP),
8/// it is convenient to print strings as ASCII when possible.
9///
10/// This struct wraps `&[u8]` just to override `fmt::Debug`.
11///
12/// `BsDebug` is not a part of public API of bytes crate.
13pub struct BsDebug<'a>(pub &'a [u8]);
14
15impl fmt::Debug for BsDebug<'_> {
16    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
17        write!(fmt, "b\"")?;
18        for &c in self.0 {
19            // https://doc.rust-lang.org/reference.html#byte-escapes
20            if c == b'\n' {
21                write!(fmt, "\\n")?;
22            } else if c == b'\r' {
23                write!(fmt, "\\r")?;
24            } else if c == b'\t' {
25                write!(fmt, "\\t")?;
26            } else if c == b'\\' || c == b'"' {
27                write!(fmt, "\\{}", c as char)?;
28            } else if c == b'\0' {
29                write!(fmt, "\\0")?;
30            // ASCII printable
31            } else if (0x20..0x7f).contains(&c) {
32                write!(fmt, "{}", c as char)?;
33            } else {
34                write!(fmt, "\\x{c:02x}")?;
35            }
36        }
37        write!(fmt, "\"")?;
38        Ok(())
39    }
40}
ntex_bytes/debug.rs

ntex_bytes/
debug.rs
