Adding macro definitions for declaring C structures and pointers.

src/c_ptr.rs

@@ -0,0 +1,15 @@
+/// A C Pointer to an undefined structure.
+///
+/// A lot of C libraries return a pointer to an undefined structure.
+/// This is easily wrapped as an empty enum. This keeps users from being
+/// able to create an instance of the value.
+#[macro_export]
+macro_rules! c_ptr
+{
+   {
+      $name: ident
+   } =>
+   {
+      pub enum $name {}
+   };
+}

src/c_struct.rs

@@ -0,0 +1,18 @@
+/// Defines a C style structure.
+#[macro_export]
+macro_rules! c_struct
+{
+   {
+      $cname: ident
+      {
+         $($name: ident: $type: ty);*;
+      }
+   } =>
+   {
+      #[repr(C)]
+      pub struct $cname
+      {
+         $(pub $name: $type),+,
+      }
+   };
+}

src/lib.rs

@@ -22,6 +22,8 @@ mod macros;
 // Basic C type macro modules.
 mod c_enum;
 mod c_flags;
+mod c_ptr;
+mod c_struct;
 mod c_types;
 
 // Raw platform data retrieval.