From fb508b86fdb9d628842cd0f9796f6df256b9f536 Mon Sep 17 00:00:00 2001
From: gbrochar <gaetanbrochard@protonmail.com>
Date: Tue, 8 Dec 2020 20:06:43 +0100
Subject: [PATCH] unsafe_rust

---
 unsafe_rust/Cargo.toml  |  9 ++++++
 unsafe_rust/src/main.rs | 65 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 unsafe_rust/Cargo.toml
 create mode 100644 unsafe_rust/src/main.rs

diff --git a/unsafe_rust/Cargo.toml b/unsafe_rust/Cargo.toml
new file mode 100644
index 0000000..3ff03ff
--- /dev/null
+++ b/unsafe_rust/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "unsafe_rust"
+version = "0.1.0"
+authors = ["gbrochar <gaetanbrochard@protonmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/unsafe_rust/src/main.rs b/unsafe_rust/src/main.rs
new file mode 100644
index 0000000..310abbc
--- /dev/null
+++ b/unsafe_rust/src/main.rs
@@ -0,0 +1,65 @@
+use std::slice;
+
+unsafe fn dangerous() {
+}
+
+fn split_at_mut(slice: &mut [i32], mid: usize) -> (&mut [i32], &mut [i32]) {
+    let len = slice.len();
+    let ptr = slice.as_mut_ptr();
+
+    assert!(mid <= len);
+
+    unsafe {
+        (
+            slice::from_raw_parts_mut(ptr, mid),
+            slice::from_raw_parts_mut(ptr.add(mid), len - mid),
+        )
+    }
+}
+
+extern "C" {
+    fn abs(input: i32) -> i32;
+}
+
+static mut COUNTER: u32 = 0;
+
+fn add_to_count(inc: u32) {
+    unsafe {
+        COUNTER += inc;
+    }
+}
+
+fn main() {
+    let mut num = 5;
+
+    let r1 = &num as *const i32;
+    let r2 = &mut num as *mut i32;
+
+    unsafe {
+        println!("r1 is: {}", *r1);
+        println!("r2 is: {}", *r2);
+    }
+
+    unsafe {
+        dangerous();
+    }
+
+    let mut v = vec![1, 2, 3, 4, 5, 6];
+
+    let r = &mut v[..];
+
+    let (a, b) = split_at_mut(r, 3);
+
+    assert_eq!(a, &mut [1, 2, 3]);
+    assert_eq!(b, &mut [4, 5, 6]);
+
+    unsafe {
+        println!("Absolute value of -3 according to C: {}", abs(-3));
+    }
+
+    add_to_count(3);
+
+    unsafe {
+        println!("COUNTER: {}", COUNTER);
+    }
+}