From c1ded82b584bb3fd93f677ce6c1499c1e60c21ad Mon Sep 17 00:00:00 2001
From: qydysky <32743305+qydysky@users.noreply.github.com>
Date: Thu, 2 Mar 2023 23:57:38 +0800
Subject: [PATCH] Fix

---
 slice/Slice.go      |  2 +-
 slice/Slice_test.go | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/slice/Slice.go b/slice/Slice.go
index 900935d..0120c3e 100644
--- a/slice/Slice.go
+++ b/slice/Slice.go
@@ -71,7 +71,7 @@ func (t *Buf[T]) Append(data []T) error {
 			t.buf = make([]T, len(data), t.maxsize)
 		}
 	} else {
-		diff := cap(t.buf) - t.bufsize - len(data)
+		diff := len(t.buf) - t.bufsize - len(data)
 		if diff < 0 {
 			t.buf = append(t.buf, make([]T, -diff)...)
 		} else {
diff --git a/slice/Slice_test.go b/slice/Slice_test.go
index 435793d..a093095 100644
--- a/slice/Slice_test.go
+++ b/slice/Slice_test.go
@@ -54,3 +54,28 @@ func TestXxx(t *testing.T) {
 		t.Fatal()
 	}
 }
+
+func TestXxx2(t *testing.T) {
+	var c = New[byte]()
+	c.Append([]byte("12345"))
+	c.Append([]byte("67890"))
+	first := c.GetCopyBuf()
+	c.Reset()
+	c.Append([]byte("abc"))
+	c.Append([]byte("defg"))
+	second := c.GetCopyBuf()
+	c.Reset()
+	c.Append([]byte("akjsdhfaksdjhf"))
+	c.Append([]byte("9834719203857"))
+	third := c.GetCopyBuf()
+	c.Reset()
+	if !bytes.Equal(first, []byte("1234567890")) {
+		t.Fatal()
+	}
+	if !bytes.Equal(second, []byte("abcdefg")) {
+		t.Fatal()
+	}
+	if !bytes.Equal(third, []byte("akjsdhfaksdjhf9834719203857")) {
+		t.Fatal()
+	}
+}
-- 
2.39.2