From e268038a68839e2e5d506b45560c7ea79c5ce509 Mon Sep 17 00:00:00 2001
From: itchyny <itchyny@hatena.ne.jp>
Date: Thu, 3 Sep 2020 20:07:08 +0900
Subject: [PATCH] Avoid strings.Split to reduce allocation

---
 decode.go | 7 ++++---
 encode.go | 7 ++++---
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/decode.go b/decode.go
index 1e38fe5..62fb0c0 100644
--- a/decode.go
+++ b/decode.go
@@ -102,9 +102,10 @@ func Unmarshal(data []byte, v interface{}) error {
 		ft := t.Field(i)
 		fv := rv.Field(i)
 
-		tag := ft.Tag.Get("ltsv")
-		tags := strings.Split(tag, ",")
-		key := tags[0]
+		key := ft.Tag.Get("ltsv")
+		if i := strings.IndexByte(key, ','); i >= 0 {
+			key = key[:i]
+		}
 		if key == "-" {
 			continue
 		}
diff --git a/encode.go b/encode.go
index 6e80098..44c9cb4 100644
--- a/encode.go
+++ b/encode.go
@@ -66,9 +66,10 @@ func makeStructWriter(v reflect.Value) fieldWriter {
 	writers := make([]fieldWriter, n)
 	for i := 0; i < n; i++ {
 		ft := t.Field(i)
-		tag := ft.Tag.Get("ltsv")
-		tags := strings.Split(tag, ",")
-		key := tags[0]
+		key := ft.Tag.Get("ltsv")
+		if i := strings.IndexByte(key, ','); i >= 0 {
+			key = key[:i]
+		}
 		if key == "-" {
 			continue
 		}