38 lines
1.1 KiB
Rust
38 lines
1.1 KiB
Rust
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/// appends zeroes to the end of the string and converts it into a pointer
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/// useful for quick ffi
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pub macro cstr($str:expr) {
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concat!($str,"\0\0").as_ptr() as *const _
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}
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/// utility macro for inline c functions
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///
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/// | macro | rust |
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/// |-----------|----------|
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/// | ```cfn!( () -> usize )``` | ``` extern "C" fn() -> usize``` |
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/// | ```cfn!( (usize) -> usize )``` | ``` extern "C" fn(usize) -> usize``` |
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/// | ```cfn!( (usize) )``` | ``` extern "C" fn(usize)``` |
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/// | ```cfn!( (u32, usize, usize) -> u32 )``` | ``` extern "C" fn(u32, usize, usize) -> u32``` |
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pub macro cfn($str:expr) {
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( ($($t:ty),*)) => {
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extern "C" fn($( $t ),* )
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};
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( ($($t:ty),*) -> $r:ty) => {
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extern "C" fn($( $t ),* ) -> $r
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}
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}
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#[inline(always)]
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pub fn _chain_helper<const N: usize>(address: usize, links: [usize;N]) -> usize {
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links.iter().fold(address, |b,r| unsafe {*((b + *r) as *const usize)} )
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}
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#[allow(unused)]
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use crate::cast_traits::As;
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pub macro ptr_chain( $base:expr, $($link:expr),* ) {
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_chain_helper(As::<usize>::cast($base), [
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$(As::<usize>::cast($link)),*
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])
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} |