ctru-rs: Add Error module

ctru-rs/src/error.rs

@@ -0,0 +1,38 @@
+use std::error;
+use std::fmt;
+
+pub type Result<T> = ::std::result::Result<T, Error>;
+
+/// The error type returned by all libctru functions.
+pub enum Error {
+    Os(i32),
+}
+
+impl From<i32> for Error {
+    fn from(err: i32) -> Self {
+        Error::Os(err)
+    }
+}
+
+impl fmt::Debug for Error {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            Error::Os(err) => write!(f, "libctru result code: {:08X}", err),
+        }
+    }
+}
+
+// TODO: Expand libctru result code into human-readable error message
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            Error::Os(err) => write!(f, "libctru result code: 0x{:08X}", err),
+        }
+    }
+}
+
+impl error::Error for Error {
+    fn description(&self) -> &str {
+        "error originating from a libctru function"
+    }
+}

ctru-rs/src/lib.rs

@@ -8,11 +8,14 @@ extern crate widestring;
 extern crate ctru_sys as libctru;
 
 pub mod console;
+pub mod error;
 pub mod srv;
 pub mod gfx;
 pub mod services;
 pub mod sdmc;
 
+pub use error::{Result, Error};
+
 pub use srv::Srv;
 pub use gfx::Gfx;
 pub use sdmc::Sdmc;

ctru-rs/src/sdmc.rs

@@ -7,11 +7,11 @@ pub struct Sdmc {
 }
 
 impl Sdmc {
-    pub fn init() -> Result<Sdmc, i32> {
+    pub fn init() -> ::Result<Sdmc> {
         unsafe {
             let r = sdmcInit();
             if r < 0 {
-                Err(r)
+                Err(::Error::from(r))
             } else {
                 Ok(Sdmc { pd: PhantomData })
             }

ctru-rs/src/services/apt.rs

@@ -7,11 +7,11 @@ pub struct Apt {
 }
 
 impl Apt {
-    pub fn init() -> Result<Apt, i32> {
+    pub fn init() -> ::Result<Apt> {
         unsafe {
             let r = apt::aptInit();
             if r < 0 {
-                Err(r)
+                Err(::Error::from(r))
             } else {
                 Ok(Apt { pd: PhantomData })
             }

ctru-rs/src/services/hid.rs

@@ -78,11 +78,11 @@ pub struct Hid {
 }
 
 impl Hid {
-    pub fn init() -> Result<Hid, i32> {
+    pub fn init() -> ::Result<Hid> {
         unsafe {
             let r = hid::hidInit();
             if r < 0 {
-                Err(r)
+                Err(::Error::from(r))
             } else {
                 Ok(Hid { pd: PhantomData })
             }

ctru-rs/src/srv.rs

@@ -7,11 +7,11 @@ pub struct Srv {
 }
 
 impl Srv {
-    pub fn init() -> Result<Srv, i32> {
+    pub fn init() -> ::Result<Srv> {
         unsafe {
             let r = srvInit();
             if r < 0 {
-                Err(r)
+                Err(::Error::from(r))
             } else {
                 Ok(Srv { pd: PhantomData })
             }