Start of the project

sane-sys/Cargo.toml

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+[package]
+name = "sane-sys"
+version = "0.1.0"
+authors = ["Magnus Ulimoen <magnus@ulimoen.dev>"]
+edition = "2018"
+links = "sane"
+build = "build.rs"
+readme = "README.md"
+
+[dependencies]
+
+[build-dependencies]
+bindgen = "0.54.1"

sane-sys/README.md

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+# sane-sys
+
+FFI wrapper for the [SANE API](http://www.sane-project.org) for consumption by rustaceans.
+
+## Prerequisites
+
+Requires the SANE library to be installed, including the headers when building this library.

sane-sys/build.rs

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+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+    println!("cargo:rerun-if-changed=src/wrapper.h");
+    println!("cargo:rerun-if-changed=build.rs");
+
+    println!("cargo:rustc-link-lib=sane");
+
+    let bindings = bindgen::Builder::default()
+        .header("src/wrapper.h")
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
+        .generate()
+        .expect("Unable to generate bindings to SANE");
+
+    let out_path = PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    bindings
+        .write_to_file(out_path.join("bindings.rs"))
+        .expect("Couldn't write SANE bindings");
+}

sane-sys/src/lib.rs

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+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+
+pub const fn SANE_VERSION_MAJOR(code: SANE_Int) -> SANE_Word {
+    (code >> 24) as SANE_Word & 0xff
+}
+
+pub const fn SANE_VERSION_MINOR(code: SANE_Int) -> SANE_Word {
+    (code >> 16) as SANE_Word & 0xff
+}
+
+pub const fn SANE_VERSION_BUILD(code: SANE_Int) -> SANE_Word {
+    (code >> 0) as SANE_Word & 0xffff
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn smokescreen() {
+        use std::ptr::null_mut;
+        let status = unsafe { sane_init(null_mut(), None) };
+        assert_eq!(status, SANE_Status_SANE_STATUS_GOOD);
+
+        unsafe { sane_exit() }
+    }
+}

sane-sys/src/wrapper.h

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+#include <sane/sane.h>