mirror of
https://github.com/tokio-rs/bytes.git
synced 2026-08-12 00:00:14 +02:00
Chris BeckandCarl Lerche
c17e40115f
To make the library work as `no_std` we add an `std` feature which is on by default. When it is off, we compile as `no_std` and make parts of the API that require `std::io` conditional on the `std` feature.
41 lines
1.4 KiB
Rust
41 lines
1.4 KiB
Rust
use core::fmt;
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/// Alternative implementation of `fmt::Debug` for byte slice.
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///
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/// Standard `Debug` implementation for `[u8]` is comma separated
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/// list of numbers. Since large amount of byte strings are in fact
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/// ASCII strings or contain a lot of ASCII strings (e. g. HTTP),
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/// it is convenient to print strings as ASCII when possible.
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///
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/// This struct wraps `&[u8]` just to override `fmt::Debug`.
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///
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/// `BsDebug` is not a part of public API of bytes crate.
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pub struct BsDebug<'a>(pub &'a [u8]);
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impl fmt::Debug for BsDebug<'_> {
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fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
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write!(fmt, "b\"")?;
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for &c in self.0 {
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// https://doc.rust-lang.org/reference.html#byte-escapes
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if c == b'\n' {
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write!(fmt, "\\n")?;
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} else if c == b'\r' {
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write!(fmt, "\\r")?;
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} else if c == b'\t' {
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write!(fmt, "\\t")?;
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} else if c == b'\\' || c == b'"' {
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write!(fmt, "\\{}", c as char)?;
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} else if c == b'\0' {
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write!(fmt, "\\0")?;
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// ASCII printable
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} else if c >= 0x20 && c < 0x7f {
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write!(fmt, "{}", c as char)?;
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} else {
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write!(fmt, "\\x{:02x}", c)?;
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}
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}
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write!(fmt, "\"")?;
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Ok(())
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}
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}
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