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// linux source:
// block/genhd.c >= v2.6.18
// https://elixir.bootlin.com/linux/v2.6.18/source/net/core/dev.c#L2108
use crate::netdevs::NetDev;
use crate::netdevs::NetDevs;
use crate::util::{find_to_pos, skip_to_pos};
use cfg_iif::cfg_iif;
#[allow(unused_imports)]
use crate::util::find_to_opt;
#[derive(Debug, Default, Clone)]
pub struct NetDevsParser();
impl NetDevsParser {
pub fn parse(&mut self, sl: &[u8]) -> NetDevs {
let mut netdevs = NetDevs::default();
if sl.is_empty() {
return netdevs;
}
//
let mut pos1: usize = 0;
let mut pos2: usize;
let mut pos_end: usize;
let mut idx: usize = 0;
//
// skip header 1
let haystack = &sl[pos1..];
let needle = b"\n";
pos2 = pos1 + find_to_pos(haystack, needle);
pos1 = pos2 + 1;
// skip header 2
let haystack = &sl[pos1..];
let needle = b"\n";
pos2 = pos1 + find_to_pos(haystack, needle);
pos1 = pos2 + 1;
//
'net_loop: loop {
if pos1 >= sl.len() {
break 'net_loop;
}
let haystack = &sl[pos1..];
let needle = b"\n";
pos_end = pos1
+ 1
+ match find_to_opt(haystack, needle) {
Some(pos) => pos,
None => break 'net_loop,
};
//
if idx >= netdevs.nets.len() {
netdevs.nets.resize(idx + 1, NetDev::default());
}
let net_ref: &mut NetDev = match netdevs.nets.get_mut(idx) {
Some(net) => net,
None => unreachable!(),
};
{
// content of /proc/net/dev
// " br0: 15826243374 23367319 0 0 0 0 0 0 3034115058 22744337 0 0 0 0 0 0\n"
// "virbr1-nic: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0\n"
// on linux:
// "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
// "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n"
//
// from https://elixir.bootlin.com/linux/v2.6.18/source/net/core/dev.c
//
macro_rules! myscan {
(skip_spaces) => {{
pos1 += skip_to_pos(&sl[pos1..pos_end], b' ');
}};
(skip, $needle:expr) => {{
pos2 = {
let haystack = &sl[pos1..pos_end];
let needle = $needle;
pos1 + find_to_pos(haystack, needle)
};
let s = &sl[pos1..pos2];
pos1 = pos2 + 1;
s
}};
($needle:expr) => {{
let s = myscan!(skip, $needle);
let input = String::from_utf8_lossy(s);
input.as_ref().parse().unwrap()
}};
}
//
myscan!(skip_spaces);
let s = myscan!(skip, b":");
net_ref.name = String::from_utf8_lossy(s).into_owned();
//
if sl[pos1..pos_end].starts_with(b" No statistics available.") {
myscan!(skip, b"\n");
let _ = pos1;
} else {
myscan!(skip_spaces);
{
net_ref.rx_bytes = myscan!(b" ");
}
myscan!(skip_spaces);
{
net_ref.rx_packets = myscan!(b" ");
}
myscan!(skip_spaces);
cfg_iif!(feature = "has_netdevs_rx_errors" {
net_ref.rx_errors = myscan!(b" ");
} else {
myscan!(skip, b" ");
});
myscan!(skip_spaces);
cfg_iif!(feature = "has_netdevs_rx_dropped_errors" {
net_ref.rx_dropped_errors = myscan!(b" ");
} else {
myscan!(skip, b" ");
});
myscan!(skip_spaces);
cfg_iif!(feature = "has_netdevs_rx_fifo_errors" {
net_ref.rx_fifo_errors = myscan!(b" ");
} else {
myscan!(skip, b" ");
});
myscan!(skip_spaces);
cfg_iif!(feature = "has_netdevs_rx_frame_errors" {
net_ref.rx_frame_errors = myscan!(b" ");
} else {
myscan!(skip, b" ");
});
myscan!(skip_spaces);
cfg_iif!(feature = "has_netdevs_rx_compressed" {
net_ref.rx_compressed = myscan!(b" ");
} else {
myscan!(skip, b" ");
});
myscan!(skip_spaces);
cfg_iif!(feature = "has_netdevs_rx_multicast" {
net_ref.rx_multicast = myscan!(b" ");
} else {
myscan!(skip, b" ");
});
//
myscan!(skip_spaces);
{
net_ref.tx_bytes = myscan!(b" ");
}
myscan!(skip_spaces);
{
net_ref.tx_packets = myscan!(b" ");
}
myscan!(skip_spaces);
cfg_iif!(feature = "has_netdevs_tx_errors" {
net_ref.tx_errors = myscan!(b" ");
} else {
myscan!(skip, b" ");
});
myscan!(skip_spaces);
cfg_iif!(feature = "has_netdevs_tx_dropped_errors" {
net_ref.tx_dropped_errors = myscan!(b" ");
} else {
myscan!(skip, b" ");
});
myscan!(skip_spaces);
cfg_iif!(feature = "has_netdevs_tx_fifo_errors" {
net_ref.tx_fifo_errors = myscan!(b" ");
} else {
myscan!(skip, b" ");
});
myscan!(skip_spaces);
cfg_iif!(feature = "has_netdevs_tx_collisions" {
net_ref.tx_collisions = myscan!(b" ");
} else {
myscan!(skip, b" ");
});
myscan!(skip_spaces);
cfg_iif!(feature = "has_netdevs_tx_carrier_errors" {
net_ref.tx_carrier_errors = myscan!(b" ");
} else {
myscan!(skip, b" ");
});
myscan!(skip_spaces);
cfg_iif!(feature = "has_netdevs_tx_compressed" {
net_ref.tx_compressed = myscan!(b"\n");
} else {
myscan!(skip, b"\n");
});
let _ = pos1;
}
}
//
idx += 1;
pos1 = pos2 + 1;
}
netdevs.nets.resize(idx, NetDev::default());
//
netdevs
}
}