move zeroidc to rustybits folder

rustybits/zeroidc/build.rs

@@ -0,0 +1,39 @@
+extern crate cbindgen;
+
+use cbindgen::{Config, Language};
+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
+
+    let package_name = env::var("CARGO_PKG_NAME").unwrap();
+    let output_file = target_dir()
+        .join(format!("{}.h", package_name))
+        .display()
+        .to_string();
+
+    let config = Config {
+        language: Language::C,
+        cpp_compat: true,
+        namespace: Some(String::from("zeroidc")),
+        ..Default::default()
+    };
+
+    cbindgen::generate_with_config(&crate_dir, config)
+        .unwrap()
+        .write_to_file(&output_file);
+}
+
+/// Find the location of the `target/` directory. Note that this may be
+/// overridden by `cmake`, so we also need to check the `CARGO_TARGET_DIR`
+/// variable.
+fn target_dir() -> PathBuf {
+    if let Ok(target) = env::var("CARGO_TARGET_DIR") {
+        PathBuf::from(target)
+    } else {
+        PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap())
+            .join("..")
+            .join("target")
+    }
+}