v0.0.0b

sub/core/src/ffi.rs

@@ -0,0 +1,38 @@
+
+/// appends zeroes to the end of the string and converts it into a pointer
+/// useful for quick ffi
+pub macro cstr($str:expr) {
+    concat!($str,"\0\0").as_ptr() as *const _
+}
+
+
+
+/// 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``` |
+pub macro cfn($str:expr) {
+    ( ($($t:ty),*)) => {
+        extern "C" fn($( $t ),* )
+    };
+    ( ($($t:ty),*) -> $r:ty) => {
+        extern "C" fn($( $t ),* ) -> $r
+    }
+}
+
+#[inline(always)]
+pub fn _chain_helper<const N: usize>(address: usize, links: [usize;N]) -> usize {
+    links.iter().fold(address, |b,r| unsafe {*((b + *r) as *const usize)} )
+}
+
+#[allow(unused)]
+use crate::cast_traits::As;
+pub macro ptr_chain( $base:expr, $($link:expr),* ) {
+    _chain_helper(As::<usize>::cast($base), [
+            $(As::<usize>::cast($link)),*
+    ])
+}