From e7f2fc92c8fd64485d635b1cc7b0c2897d78bc69 Mon Sep 17 00:00:00 2001
From: Alberto Sartori <alberto.sartori@huawei.com>
Date: Tue, 23 Jul 2024 17:24:16 +0200
Subject: rules-rust: add interoperability tutorials

---
 doc/interoperability/c-from-rust/main.rs | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 doc/interoperability/c-from-rust/main.rs

(limited to 'doc/interoperability/c-from-rust/main.rs')

diff --git a/doc/interoperability/c-from-rust/main.rs b/doc/interoperability/c-from-rust/main.rs
new file mode 100644
index 0000000..ff27dd7
--- /dev/null
+++ b/doc/interoperability/c-from-rust/main.rs
@@ -0,0 +1,21 @@
+use std::env;
+
+// declaration of the function implemented in the C library
+extern "C" {
+    fn c_func(input: i32) -> i32;
+}
+
+// wrapper to call the C function
+fn c_call(i: i32) -> i32 {
+    unsafe {
+        return c_func(i);
+    }
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    match args[1].parse::<i32>() {
+        Ok(i) => println!("Absolute value of {} is {}", i, c_call(i)),
+        Err(..) => println!("Wrong argument {}", args[1]),
+    };
+}
-- 
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