限制字符函数去除\u0000乱码

utils/utils.go

@@ -370,45 +370,26 @@ func LimitMixedStringLen(str string, maxByteCount int) (limitedStr string) {
 
 // 限制的是字符数，不是字节数
 func LimitUTF8StringLen2(str string, maxRuneCount int) (limitedStr string) {
-	str2 := ""
-	bs := []byte(str)
-	bl := 0
+	if maxRuneCount > 0 {
+		if len(str) > maxRuneCount {
+			runeList := []rune(str)
+			if len(runeList) > maxRuneCount {
+				str = string(runeList[:maxRuneCount])
+			}
+		}
+	}
+	limitedStr = loop([]byte(str))
+	return limitedStr
+}
+
+func loop(bs []byte) (result string) {
 	for i := len(bs) - 1; i >= 0; i-- {
-		switch {
-		case bs[i] >= 0 && bs[i] <= 127 && bs[i] != 42 && bs[i] != 40 && bs[i] != 41:
+		if bs[i] == 0 {
 			bs2 := bs[:i]
 			bs3 := bs[i+1:]
 			bs4 := [][]byte{bs2, bs3}
-			return string(bytes.Join(bs4, []byte("")))
-		case bs[i] >= 128 && bs[i] <= 191:
-			bl++
-		case bs[i] >= 192 && bs[i] <= 253:
-			cl := 0
-			switch {
-			case bs[i]&252 == 252:
-				cl = 6
-			case bs[i]&248 == 248:
-				cl = 5
-			case bs[i]&240 == 240:
-				cl = 4
-			case bs[i]&224 == 224:
-				cl = 3
-			default:
-				cl = 2
-			}
-			if bl+1 == cl {
-				str2 = string(bs[:i+cl])
-			}
-			str2 = string(bs[:i])
+			return loop(bytes.Join(bs4, []byte("")))
 		}
 	}
-	if maxRuneCount > 0 {
-		if len(str2) > maxRuneCount {
-			runeList := []rune(str2)
-			if len(runeList) > maxRuneCount {
-				str2 = string(runeList[:maxRuneCount])
-			}
-		}
-	}
-	return str2
+	return string(bs)
 }