feat(crates): new userspace examples

Thanks, StephanvanSchaik.

2 files changed, 26 insertions, 0 deletions

diff --git a/crates/user/reading_and_writing/Cargo.toml b/crates/user/reading_and_writing/Cargo.toml
new file mode 100644
index 0000000..5f2895d
--- /dev/null
+++ b/crates/user/reading_and_writing/Cargo.toml
@@ -0,0 +1,5 @@
+[package]
+name = "reading_and_writing"
+version = "0.1.0"
+edition = "2021"
+license = "MIT"
diff --git a/crates/user/reading_and_writing/src/main.rs b/crates/user/reading_and_writing/src/main.rs
new file mode 100644
index 0000000..ff6d5d7
--- /dev/null
+++ b/crates/user/reading_and_writing/src/main.rs
@@ -0,0 +1,21 @@
+use std::io::{Read, Write};
+
+fn main() -> Result<(), std::io::Error> {
+  let mut file = std::fs::OpenOptions::new()
+    .read(true)
+    .write(true)
+    .create(false)
+    .open("\\??\\Example")?;
+
+  file.write_all("Hello, World!".as_bytes())?;
+
+  let mut data = vec![0u8; 4096];
+  let size = file.read(&mut data)?;
+
+  match std::str::from_utf8(&data[..size]) {
+    Ok(s) => println!("read {} bytes from \"{}\"", size, s),
+    _ => println!("read {} bytes: {:x?}", size, &data[..size]),
+  }
+
+  Ok(())
+}