Vendor dependencies for 0.3.0 release

vendor/libudev-sys/examples/hwdb_query.rs

@@ -0,0 +1,70 @@
+extern crate libudev_sys as udev;
+extern crate libc;
+
+
+#[cfg(hwdb)] use std::env;
+#[cfg(hwdb)] use std::str;
+#[cfg(hwdb)] use std::ffi::{CString,CStr};
+#[cfg(hwdb)] use libc::c_char;
+
+#[cfg(hwdb)]
+fn main() {
+
+    let args = env::args().collect::<Vec<_>>();
+
+    if args.len() != 2 {
+        println!("Usage: hwdb_query <modalias>");
+        return;
+    }
+
+    let query = CString::new(args[1].clone()).unwrap();
+
+    unsafe {
+        let udev = udev::udev_new();
+
+        if !udev.is_null() {
+            let hwdb = udev::udev_hwdb_new(udev);
+
+            if !hwdb.is_null() {
+                query_hwdb(hwdb, &query);
+                udev::udev_hwdb_unref(hwdb);
+            }
+
+            udev::udev_unref(udev);
+        }
+    }
+}
+
+#[cfg(hwdb)]
+unsafe fn query_hwdb(hwdb: *mut udev::udev_hwdb, query: &CString) {
+    println!("{:>30}: {:?}", "query", query);
+
+    udev::udev_hwdb_ref(hwdb);
+    print_results(udev::udev_hwdb_get_properties_list_entry(hwdb, query.as_ptr(), 0));
+    udev::udev_hwdb_unref(hwdb);
+}
+
+#[cfg(hwdb)]
+unsafe fn print_results(list_entry: *mut udev::udev_list_entry) {
+    if list_entry.is_null() {
+        return;
+    }
+
+    let key = unwrap_str(udev::udev_list_entry_get_name(list_entry));
+    let val = unwrap_str(udev::udev_list_entry_get_value(list_entry));
+
+    println!("{:>30}: {}", key, val);
+
+    print_results(udev::udev_list_entry_get_next(list_entry));
+}
+
+#[cfg(hwdb)]
+unsafe fn unwrap_str<'a>(ptr: *const c_char) -> &'a str {
+    str::from_utf8(CStr::from_ptr(ptr).to_bytes()).unwrap()
+}
+
+
+#[cfg(not(hwdb))]
+fn main() {
+    println!("hwdb is not supported by native libudev");
+}