get ffi framework in place

1 files changed, 35 insertions, 0 deletions

diff --git a/src/screen.rs b/src/screen.rs
new file mode 100644
index 0000000..b448a20
--- /dev/null
+++ b/src/screen.rs
@@ -0,0 +1,35 @@
+use libc;
+
+enum ScreenImpl {}
+pub struct Screen(*mut ScreenImpl);
+
+impl Screen {
+    pub fn new(rows: u32, cols: u32) -> Screen {
+        let screen_impl = unsafe {
+            vt100_screen_new(rows as libc::c_int, cols as libc::c_int)
+        };
+        Screen(screen_impl)
+    }
+}
+
+impl Drop for Screen {
+    fn drop(&mut self) {
+        let &mut Screen(screen_impl) = self;
+        unsafe { vt100_screen_delete(screen_impl) };
+    }
+}
+
+extern "C" {
+    fn vt100_screen_new(rows: libc::c_int, cols: libc::c_int) -> *mut ScreenImpl;
+    fn vt100_screen_delete(screen: *mut ScreenImpl);
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn ffi() {
+        let ptr = unsafe { super::vt100_screen_new(24, 80) };
+        assert!(!ptr.is_null());
+        unsafe { super::vt100_screen_delete(ptr) };
+    }
+}