ft(interpreter): impl file-based minix interrupts

src/interpreter/memory.rs

@@ -62,4 +62,27 @@ impl Memory {
         log::debug!("Read raw byte {b1:#04x} and {b2:#04x}, starting at addr {addr:#04x}");
         Ok(Word::from_le_bytes([b1, b2]))
     }
+
+    /// Try to read C null-terminated string from memory location
+    /// BUG: This does not use segment registers for indexing!
+    pub fn read_c_string(&self, addr: usize) -> Option<String> {
+        let mem = &self.raw;
+
+        if addr >= mem.len() {
+            return None;
+        }
+
+        let raw = &mem[addr..];
+
+        log::debug!("Raw is {:?}", &raw[..=16]);
+
+        let nul_pos = raw.iter().position(|&b| b == 0)?;
+
+        log::debug!("Starting to read at {addr} until {nul_pos}");
+
+        let c_slice = &raw[..=nul_pos];
+        let c_str = std::ffi::CStr::from_bytes_with_nul(c_slice).ok()?;
+
+        c_str.to_str().ok().map(|s| s.to_owned())
+    }
 }