1 files changed, 27 insertions, 0 deletions
diff --git a/tvix/nix-compat/src/aterm/escape.rs b/tvix/nix-compat/src/aterm/escape.rs
new file mode 100644
index 0000000000..06b550bbf0
--- /dev/null
+++ b/tvix/nix-compat/src/aterm/escape.rs
@@ -0,0 +1,27 @@
+use bstr::ByteSlice;
+
+/// Escapes a byte sequence. Does not add surrounding quotes.
+pub fn escape_bytes<P: AsRef<[u8]>>(s: P) -> Vec<u8> {
+    let mut s: Vec<u8> = s.as_ref().to_vec();
+
+    s = s.replace(b"\\", b"\\\\");
+    s = s.replace(b"\n", b"\\n");
+    s = s.replace(b"\r", b"\\r");
+    s = s.replace(b"\t", b"\\t");
+    s = s.replace(b"\"", b"\\\"");
+
+    s
+}
+
+#[cfg(test)]
+mod tests {
+    use super::escape_bytes;
+    use test_case::test_case;
+
+    #[test_case(b"", b""; "empty")]
+    #[test_case(b"\"", b"\\\""; "doublequote")]
+    #[test_case(b":", b":"; "colon")]
+    fn escape(input: &[u8], expected: &[u8]) {
+        assert_eq!(expected, escape_bytes(input))
+    }
+}