From a82c7756b39a6ec2c29e8f1bd60f2d73021e5936 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc-Andr=C3=A9=20Tremblay?=
 <1619947+marctrem@users.noreply.github.com>
Date: Wed, 16 Oct 2024 13:38:04 +0000
Subject: [PATCH] introduce ErrLineTruncated

---
 io/linereader/err_line_truncated.go | 11 +++++++++++
 io/linereader/linereader.go         |  3 +--
 2 files changed, 12 insertions(+), 2 deletions(-)
 create mode 100644 io/linereader/err_line_truncated.go

diff --git a/io/linereader/err_line_truncated.go b/io/linereader/err_line_truncated.go
new file mode 100644
index 0000000..a46a73e
--- /dev/null
+++ b/io/linereader/err_line_truncated.go
@@ -0,0 +1,11 @@
+package linereader
+
+import "fmt"
+
+type ErrLineTruncated struct {
+	Discarded int
+}
+
+func (e *ErrLineTruncated) Error() string {
+	return fmt.Sprintf("line truncated (discarded %d bytes)", e.Discarded)
+}
diff --git a/io/linereader/linereader.go b/io/linereader/linereader.go
index b0f2174..6de5ea6 100644
--- a/io/linereader/linereader.go
+++ b/io/linereader/linereader.go
@@ -2,7 +2,6 @@ package linereader
 
 import (
 	"bytes"
-	"errors"
 	"io"
 
 	armath "github.com/asymmetric-research/go-commons/math"
@@ -32,7 +31,7 @@ func NewInto(dst *T, reader io.Reader, blockSize uint) {
 func (lr *T) Read(dst []byte) (n int, err error) {
 	n, discarded, err := lr.ReadExtra(dst)
 	if discarded != 0 {
-		return n, errors.New("line too long")
+		return n, &ErrLineTruncated{Discarded: discarded}
 	}
 	return n, err
 }