mirror of
https://github.com/smoltcp-rs/smoltcp.git
synced 2025-09-29 13:51:10 +00:00
53bdf4359b
The Ipv6HopByHopRepr was previously the same as an Ipv6ExtHeader. However, the RFC says that hop-by-hop options might change, which is not possible with the current implementation. I added a representatation for the Hop-by-Hop header, which has an heapless Vec of parsed options. This way, we can modify the options when needed. The function of the Ipv6ExtHeader struct is now purely for parsing the ext header type and the length. It also returns a pointer to the data it holds, which must be parsed by the correct extension header representations.
105 lines
3.2 KiB
Rust
105 lines
3.2 KiB
Rust
use std::collections::HashMap;
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use std::fmt::Write;
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use std::path::PathBuf;
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use std::{env, fs};
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static CONFIGS: &[(&str, usize)] = &[
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// BEGIN AUTOGENERATED CONFIG FEATURES
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// Generated by gen_config.py. DO NOT EDIT.
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("IFACE_MAX_ADDR_COUNT", 2),
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("IFACE_MAX_MULTICAST_GROUP_COUNT", 4),
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("IFACE_MAX_SIXLOWPAN_ADDRESS_CONTEXT_COUNT", 4),
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("IFACE_NEIGHBOR_CACHE_COUNT", 4),
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("IFACE_MAX_ROUTE_COUNT", 2),
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("FRAGMENTATION_BUFFER_SIZE", 1500),
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("ASSEMBLER_MAX_SEGMENT_COUNT", 4),
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("REASSEMBLY_BUFFER_SIZE", 1500),
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("REASSEMBLY_BUFFER_COUNT", 1),
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("IPV6_HBH_MAX_OPTIONS", 1),
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("DNS_MAX_RESULT_COUNT", 1),
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("DNS_MAX_SERVER_COUNT", 1),
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("DNS_MAX_NAME_SIZE", 255),
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("RPL_RELATIONS_BUFFER_COUNT", 16),
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("RPL_PARENTS_BUFFER_COUNT", 8),
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// END AUTOGENERATED CONFIG FEATURES
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];
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struct ConfigState {
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value: usize,
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seen_feature: bool,
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seen_env: bool,
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}
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fn main() {
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// only rebuild if build.rs changed. Otherwise Cargo will rebuild if any
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// other file changed.
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println!("cargo:rerun-if-changed=build.rs");
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// Rebuild if config envvar changed.
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for (name, _) in CONFIGS {
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println!("cargo:rerun-if-env-changed=SMOLTCP_{name}");
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}
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let mut configs = HashMap::new();
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for (name, default) in CONFIGS {
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configs.insert(
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*name,
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ConfigState {
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value: *default,
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seen_env: false,
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seen_feature: false,
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},
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);
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}
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for (var, value) in env::vars() {
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if let Some(name) = var.strip_prefix("SMOLTCP_") {
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let Some(cfg) = configs.get_mut(name) else {
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panic!("Unknown env var {name}")
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};
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let Ok(value) = value.parse::<usize>() else {
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panic!("Invalid value for env var {name}: {value}")
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};
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cfg.value = value;
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cfg.seen_env = true;
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}
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if let Some(feature) = var.strip_prefix("CARGO_FEATURE_") {
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if let Some(i) = feature.rfind('_') {
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let name = &feature[..i];
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let value = &feature[i + 1..];
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if let Some(cfg) = configs.get_mut(name) {
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let Ok(value) = value.parse::<usize>() else {
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panic!("Invalid value for feature {name}: {value}")
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};
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// envvars take priority.
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if !cfg.seen_env {
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if cfg.seen_feature {
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panic!(
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"multiple values set for feature {}: {} and {}",
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name, cfg.value, value
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);
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}
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cfg.value = value;
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cfg.seen_feature = true;
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}
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}
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}
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}
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}
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let mut data = String::new();
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for (name, cfg) in &configs {
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writeln!(&mut data, "pub const {}: usize = {};", name, cfg.value).unwrap();
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}
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let out_dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
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let out_file = out_dir.join("config.rs").to_string_lossy().to_string();
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fs::write(out_file, data).unwrap();
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}
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