From 12fe95497c5c27062189781af6fbc52f2518c47c Mon Sep 17 00:00:00 2001
From: Ayman Bagabas <ayman.bagabas@gmail.com>
Date: Mon, 4 Nov 2024 12:53:14 -0500
Subject: [PATCH] fix(ansi): param should return -1 if missing

---
 ansi/parser_decode.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/ansi/parser_decode.go b/ansi/parser_decode.go
index ba6ebd2a..0ed802cb 100644
--- a/ansi/parser_decode.go
+++ b/ansi/parser_decode.go
@@ -437,7 +437,11 @@ type Param int
 // Param returns the parameter at the given index.
 // It returns -1 if the parameter does not exist.
 func (s Param) Param() int {
-	return int(s) & parser.ParamMask
+	p := int(s) & parser.ParamMask
+	if p == parser.MissingParam {
+		return -1
+	}
+	return p
 }
 
 // HasMore returns true if the parameter has more sub-parameters.