From e553da2c61cd28fecc684726a35648ad1faf35e6 Mon Sep 17 00:00:00 2001
From: Timon Ringwald <timon.ringwald@mequen.de>
Date: Wed, 4 May 2022 09:49:22 +0200
Subject: [PATCH] fixed panic when writing to zero-sized buffer

---
 buffer.go      | 4 +++-
 buffer_test.go | 5 +++++
 go.sum         | 0
 3 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 go.sum

diff --git a/buffer.go b/buffer.go
index 5c62467..eec10ed 100644
--- a/buffer.go
+++ b/buffer.go
@@ -42,7 +42,9 @@ func (b *Buffer[T]) y(y int) int {
 
 // Set sets the value at position (x,y) to c
 func (b *Buffer[T]) Set(x, y int, v T) {
-	b.data[b.y(y)][b.x(x)] = v
+	if b.width >= 0 && b.height >= 0 {
+		b.data[b.y(y)][b.x(x)] = v
+	}
 }
 
 // Get returns the value at position (x,y)
diff --git a/buffer_test.go b/buffer_test.go
index 2802ae2..64e55cf 100644
--- a/buffer_test.go
+++ b/buffer_test.go
@@ -17,3 +17,8 @@ func TestSub(t *testing.T) {
 	fmt.Println(strings.Repeat("-", 10))
 	fmt.Println(s)
 }
+
+func TestSet(t *testing.T) {
+	b := NewBuffer(10, 10, ' ')
+	b.Set(11, 0, 'a')
+}
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..e69de29