From 2226be777a6925095420359e3ea2d1b5c672b02f Mon Sep 17 00:00:00 2001
From: wdvxdr <wdvxdr@foxmail.com>
Date: Sun, 28 Mar 2021 19:06:42 +0800
Subject: [PATCH] fix: reduce limitedString memory cost

(cherry picked from commit 5b0c693aba387e17c98ba0ecc817baae4eb98b2e)
---
 coolq/api.go | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/coolq/api.go b/coolq/api.go
index 83a5fea..b8c8955 100644
--- a/coolq/api.go
+++ b/coolq/api.go
@@ -4,10 +4,6 @@ import (
 	"crypto/md5"
 	"encoding/hex"
 	"fmt"
-	"github.com/Mrs4s/MiraiGo/binary"
-	"github.com/Mrs4s/MiraiGo/client"
-	"github.com/Mrs4s/MiraiGo/message"
-	"github.com/tidwall/gjson"
 	"io/ioutil"
 	"math"
 	"os"
@@ -17,9 +13,16 @@ import (
 	"strconv"
 	"strings"
 	"time"
+	"unicode/utf8"
+
+	"github.com/Mrs4s/MiraiGo/binary"
+	"github.com/Mrs4s/MiraiGo/client"
+	"github.com/Mrs4s/MiraiGo/message"
+	"github.com/Mrs4s/MiraiGo/utils"
+	log "github.com/sirupsen/logrus"
+	"github.com/tidwall/gjson"
 
 	"github.com/Mrs4s/go-cqhttp/global"
-	log "github.com/sirupsen/logrus"
 )
 
 // Version go-cqhttp的版本信息，在编译时使用ldflags进行覆盖
@@ -1354,10 +1357,15 @@ func convertGroupMemberInfo(groupID int64, m *client.GroupMemberInfo) MSG {
 }
 
 func limitedString(str string) string {
-	if strings.Count(str, "") <= 10 {
+	if utf8.RuneCountInString(str) <= 10 {
 		return str
 	}
-	limited := []rune(str)
-	limited = limited[:10]
+	b := utils.S2B(str)
+	limited := make([]rune, 0, 10)
+	for i := 0; i < 10; i++ {
+		decodeRune, size := utf8.DecodeRune(b)
+		b = b[size:]
+		limited = append(limited, decodeRune)
+	}
 	return string(limited) + " ..."
 }