From 5b4890d351b5e518bfda862e05f7905dc373cacd Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Thu, 18 Nov 2021 17:18:34 -0500
Subject: add an example suitable for feeding to a fuzzer

---
 examples/fuzz.rs | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 examples/fuzz.rs

diff --git a/examples/fuzz.rs b/examples/fuzz.rs
new file mode 100644
index 0000000..6ae7d47
--- /dev/null
+++ b/examples/fuzz.rs
@@ -0,0 +1,62 @@
+use std::io::Read as _;
+
+#[path = "../tests/helpers/mod.rs"]
+mod helpers;
+
+fn main() {
+    let mut vt_base = vt100::Parser::default();
+    let mut vt_diff = vt100::Parser::default();
+    let mut prev_screen = vt_base.screen().clone();
+    let empty_screen = vt100::Parser::default().screen().clone();
+    loop {
+        let mut byte = [0];
+        match std::io::stdin().read(&mut byte) {
+            Ok(bytes) => {
+                if bytes != 1 {
+                    break;
+                }
+            }
+            Err(e) => {
+                eprintln!("{}", e);
+                break;
+            }
+        }
+        vt_base.process(&byte);
+
+        let mut vt_full = vt100::Parser::default();
+        vt_full.process(&vt_base.screen().state_formatted());
+        vt_full.process(&vt_base.screen().bells_diff(&empty_screen));
+        assert!(
+            helpers::compare_screens(vt_base.screen(), vt_full.screen()),
+            "full"
+        );
+
+        vt_diff.process(&vt_base.screen().state_diff(&prev_screen));
+        vt_diff.process(&vt_base.screen().bells_diff(&empty_screen));
+        prev_screen = vt_base.screen().clone();
+        assert!(
+            helpers::compare_screens(vt_base.screen(), vt_diff.screen()),
+            "diff"
+        );
+
+        let mut vt_rows = vt100::Parser::default();
+        let mut wrapped = false;
+        for (idx, row) in vt_base.screen().rows_formatted(0, 80).enumerate() {
+            vt_rows.process(b"\x1b[m");
+            if !wrapped {
+                vt_rows.process(format!("\x1b[{}H", idx + 1).as_bytes());
+            }
+            vt_rows.process(&row);
+            wrapped = vt_base.screen().row_wrapped(idx.try_into().unwrap());
+        }
+        vt_rows.process(&vt_base.screen().cursor_state_formatted());
+        vt_rows.process(&vt_base.screen().attributes_formatted());
+        vt_rows.process(&vt_base.screen().input_mode_formatted());
+        vt_rows.process(&vt_base.screen().title_formatted());
+        vt_rows.process(&vt_base.screen().bells_diff(&empty_screen));
+        assert!(
+            helpers::compare_screens(vt_base.screen(), vt_rows.screen()),
+            "rows"
+        );
+    }
+}
-- 
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