create rust implementation

src/error.rs

@@ -0,0 +1,33 @@
+unsafe extern "C" {
+    pub fn debug(fmt: *const u8, ...);
+    pub fn info(fmt: *const u8, ...);
+    pub fn warn(fmt: *const u8, ...);
+    pub fn error(fmt: *const u8, ...);
+    pub fn fatal(fmt: *const u8, ...);
+}
+
+#[macro_export]
+macro_rules! debug {
+    ($fmt:expr) => {{ $crate::error::debug($fmt.as_ptr()); }};
+    ($fmt:expr, $($arg:expr),*) => {{ $crate::error::debug($fmt.as_ptr(), ($($arg),*)); }};
+}
+#[macro_export]
+macro_rules! info {
+    ($fmt:expr) => {{ $crate::error::info($fmt.as_ptr()); }};
+    ($fmt:expr, $($arg:expr),*) => {{ $crate::error::info($fmt.as_ptr(), ($($arg),*)); }};
+}
+#[macro_export]
+macro_rules! warn {
+    ($fmt:expr) => {{ $crate::error::warn($fmt.as_ptr()); }};
+    ($fmt:expr, $($arg:expr),*) => {{ $crate::error::warn($fmt.as_ptr(), ($($arg),*)); }};
+}
+#[macro_export]
+macro_rules! error {
+    ($fmt:expr) => {{ $crate::error::error($fmt.as_ptr()); }};
+    ($fmt:expr, $($arg:expr),*) => {{ $crate::error::error($fmt.as_ptr(), ($($arg),*)); }};
+}
+#[macro_export]
+macro_rules! fatal {
+    ($fmt:expr) => {{ $crate::error::fatal($fmt.as_ptr()); }};
+    ($fmt:expr, $($arg:expr),*) => {{ $crate::error::fatal($fmt.as_ptr(), ($($arg),*)); }};
+}

src/lib.rs

@@ -6,8 +6,16 @@ fn panic(_info: &core::panic::PanicInfo) -> ! {
     loop {}
 }
 
-#[unsafe(no_mangle)]
-pub unsafe extern "C" fn get_str() -> *const u8 {
-    let str = "Hello, World\0";
-    return str.as_ptr();
+// contains all publicly facing functions
+
+mod error;
+
+pub extern "C" fn test() {
+    unsafe {
+        debug!("%s", "hi");
+        info!("%s", "hi");
+        warn!("%s", "hi");
+        error!("%s", "hi");
+        fatal!("%s", "hi");
+    }
 }

src/main.c

@@ -1,8 +1,9 @@
-#include <stdio.h>
+#include "error.h"
 
-extern char const* get_str(void);
+extern void test(void);
 
 int main(int argc, char** argv) {
 	(void)argc, (void)argv;
-	printf("%s\n", get_str());
+	test();
+	debug("owo");
 }