initial

src/cffi.rs

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+
+/// appends zeroes to the end of the string and converts it into a pointer
+/// useful for quick ffi
+#[macro_export]
+macro_rules! cstr {
+    ($str:expr) => {
+        concat!($str,"\0\0").as_ptr() as *const i8
+    }
+}
+
+
+/// utility macro for inline c functions
+///
+/// |  macro  |  rust  |
+/// |-----------|----------|
+/// | ```cfn!( () -> usize )``` | ``` extern "C" fn() -> usize``` |
+/// | ```cfn!( (usize) -> usize )``` | ``` extern "C" fn(usize) -> usize``` |
+/// | ```cfn!( (usize) )``` | ``` extern "C" fn(usize)``` |
+/// | ```cfn!( (u32, usize, usize) -> u32 )``` | ``` extern "C" fn(u32, usize, usize) -> u32``` |
+#[macro_export]
+macro_rules! cfn {
+    ( ($($t:ty),*)) => {
+        extern "C" fn($( $t ),* )
+    };
+    ( ($($t:ty),*) -> $r:ty) => {
+        extern "C" fn($( $t ),* ) -> $r
+    }
+}
+
+/// utility macro for pointer chains
+#[macro_export]
+macro_rules! ptr_chain {
+    ($x: expr, $y:expr) => {{
+        (*core::mem::transmute::<_,*const usize>(core::mem::transmute::<_,usize>($x) + $y))
+    }};
+
+    ($x: expr, $y:expr, $( $z:expr ),+ ) => {{
+        $crate::ptr_chain!( $crate::ptr_chain!($x, $y), $( $z ),+ )
+    }};
+}