Added a macro for wrapping C STD lib functions.

src/macros.rs

@@ -1,3 +1,37 @@
+#[macro_export]
+macro_rules! c_library
+{
+   {
+      $(statics:
+        {
+           $($sname: ident: $stype: ty);+;
+        }
+      )?
+
+      $(functions:
+        {
+           $($fname: ident($($farg: ident: $fargt: ty),*) -> $fret:ty);+;
+        }
+      )?
+
+      $(varargs:
+        {
+           $($vname: ident($($vargs: ident: $vargst: ty),+) -> $vret:ty);+;
+        }
+      )?
+   } =>
+   {
+      extern "C"
+      {
+         $($(pub static $sname: $stype;)+)?
+
+         $($(pub fn $fname($($farg: $fargt),*) -> $fret;)+)?
+
+         $($(pub fn $vname($(vargs: $vargst),+ , ...) -> $vret;)+)?
+      }
+   };
+}
+
 #[macro_export]
 macro_rules! external_library
 {