1 files changed, 54 insertions, 0 deletions
diff --git a/third_party/rust/alsa/src/card.rs b/third_party/rust/alsa/src/card.rs
new file mode 100644
index 0000000000..93345f4bb7
--- /dev/null
+++ b/third_party/rust/alsa/src/card.rs
@@ -0,0 +1,54 @@
+//! Sound card enumeration
+use libc::{c_int, c_char};
+use super::error::*;
+use crate::alsa;
+use std::ffi::CStr;
+
+/// An ALSA sound card, uniquely identified by its index.
+#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Card(c_int);
+
+/// Iterate over existing sound cards.
+pub struct Iter(c_int);
+
+impl Iter {
+    pub fn new() -> Iter { Iter(-1) }
+}
+
+impl Iterator for Iter {
+    type Item = Result<Card>;
+
+    fn next(&mut self) -> Option<Result<Card>> {
+        match acheck!(snd_card_next(&mut self.0)) {
+            Ok(_) if self.0 == -1 => None,
+            Ok(_) => Some(Ok(Card(self.0))),
+            Err(e) => Some(Err(e)),
+        }
+    }
+}
+
+impl Card {
+    pub fn new(index: c_int) -> Card { Card(index) }
+    pub fn from_str(s: &CStr) -> Result<Card> {
+        acheck!(snd_card_get_index(s.as_ptr())).map(Card)
+    }
+    pub fn get_name(&self) -> Result<String> {
+        let mut c: *mut c_char = ::std::ptr::null_mut();
+        acheck!(snd_card_get_name(self.0, &mut c))
+            .and_then(|_| from_alloc("snd_card_get_name", c)) 
+    }
+    pub fn get_longname(&self) -> Result<String> {
+        let mut c: *mut c_char = ::std::ptr::null_mut();
+        acheck!(snd_card_get_longname(self.0, &mut c))
+            .and_then(|_| from_alloc("snd_card_get_longname", c)) 
+    }
+
+    pub fn get_index(&self) -> c_int { self.0 }
+}
+
+#[test]
+fn print_cards() {
+    for a in Iter::new().map(|a| a.unwrap()) {
+        println!("Card #{}: {} ({})", a.get_index(), a.get_name().unwrap(), a.get_longname().unwrap())
+    }
+}