| 1 | //! `--debug` output on stderr: a hex dump of every byte sent and received, plus notes on what |
| 2 | //! budctl decoded and decided. Off by default. |
| 3 | |
| 4 | use std::sync::atomic::{AtomicBool, Ordering}; |
| 5 | |
| 6 | static ENABLED: AtomicBool = AtomicBool::new(false); |
| 7 | |
| 8 | pub fn enable() { |
| 9 | ENABLED.store(true, Ordering::Relaxed); |
| 10 | } |
| 11 | |
| 12 | pub fn enabled() -> bool { |
| 13 | ENABLED.load(Ordering::Relaxed) |
| 14 | } |
| 15 | |
| 16 | /// Print a note when debugging is on. The message is only built if it will be printed. |
| 17 | pub(crate) fn note(message: impl FnOnce() -> String) { |
| 18 | if enabled() { |
| 19 | eprintln!("# {}", message()); |
| 20 | } |
| 21 | } |
| 22 | |
| 23 | /// `AA 07 00 …` |
| 24 | pub fn hex(bytes: &[u8]) -> String { |
| 25 | let mut out = String::with_capacity(bytes.len() * 3); |
| 26 | for (i, byte) in bytes.iter().enumerate() { |
| 27 | if i > 0 { |
| 28 | out.push(' '); |
| 29 | } |
| 30 | out.push_str(&format!("{byte:02X}")); |
| 31 | } |
| 32 | out |
| 33 | } |
| 34 | |
| 35 | #[cfg(test)] |
| 36 | mod tests { |
| 37 | #[test] |
| 38 | fn hex_is_spaced_uppercase() { |
| 39 | assert_eq!(super::hex(&[0xAA, 0x07, 0x00]), "AA 07 00"); |
| 40 | assert_eq!(super::hex(&[]), ""); |
| 41 | } |
| 42 | } |