initial import

.gitignore

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+/target
+/Cargo.lock

Cargo.toml

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+[package]
+name = "zephyr-config"
+version = "0.1.0"
+edition = "2021"
+
+[build-dependencies]
+bindgen = "0.69.1"

build.rs

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+extern crate bindgen;
+
+use std::{env, path::PathBuf};
+
+fn main() {
+    let zephyr_sdk_install_dir = PathBuf::from(env::var("ZEPHYR_SDK_INSTALL_DIR").unwrap());
+
+    let bindings = bindgen::Builder::default()
+        // Only use core, as we are in embedded land
+        .use_core()
+        // The input header we would like to generate
+        // bindings for.
+        .header("src/wrapper.h")
+        .clang_args(
+            env::var("TARGET_CFLAGS")
+                .unwrap()
+                .split(' ')
+                .filter(|&el| el != "-mfp16-format=ieee" && el != "-fno-reorder-functions"),
+        )
+        .clang_arg(format!(
+            "-I{}",
+            zephyr_sdk_install_dir
+                .join("arm-zephyr-eabi/arm-zephyr-eabi/sys-include")
+                .to_str()
+                .unwrap()
+        ))
+        // only allow CONFIG_ defines
+        .allowlist_item("^CONFIG_.*")
+        // Tell cargo to invalidate the built crate whenever any of the
+        // included header files changed.
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
+        // Finish the builder and generate the bindings.
+        .generate()
+        // Unwrap the Result and panic on failure.
+        .expect("Unable to generate bindings");
+
+    // Write the bindings to the $OUT_DIR/bindings.rs file.
+    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
+    bindings
+        .write_to_file(out_path.join("bindings.rs"))
+        .expect("Couldn't write bindings!");
+}

src/lib.rs

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+#![no_std]
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+#![allow(dead_code)]
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+
+pub fn config_str<'a>(var: &'a [u8]) -> &'a str {
+    core::ffi::CStr::from_bytes_until_nul(var)
+        .unwrap()
+        .to_str()
+        .unwrap()
+}

src/wrapper.h

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+#include <autoconf.h>