From 3bc41bae4facd5e2ca6f6fbef68767dd61316c38 Mon Sep 17 00:00:00 2001
From: Jason Travis Smith <Myrddin@CyberMagesLLC.com>
Date: Tue, 25 Jun 2019 02:31:18 -0400
Subject: [PATCH] Adding macro definitions for declaring C structures and
 pointers.

---
 src/c_ptr.rs    | 15 +++++++++++++++
 src/c_struct.rs | 18 ++++++++++++++++++
 src/lib.rs      |  2 ++
 3 files changed, 35 insertions(+)
 create mode 100644 src/c_ptr.rs
 create mode 100644 src/c_struct.rs

diff --git a/src/c_ptr.rs b/src/c_ptr.rs
new file mode 100644
index 0000000..50e1c5b
--- /dev/null
+++ b/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 {}
+   };
+}
diff --git a/src/c_struct.rs b/src/c_struct.rs
new file mode 100644
index 0000000..c4496b6
--- /dev/null
+++ b/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),+,
+      }
+   };
+}
diff --git a/src/lib.rs b/src/lib.rs
index 098e477..8f19083 100644
--- a/src/lib.rs
+++ b/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.