From b6183dc61fadff751536195f10da478f37932a88 Mon Sep 17 00:00:00 2001
From: NanXiao <xn212516@163.com>
Date: Thu, 21 Nov 2013 10:00:11 +0800
Subject: [PATCH] Add length check of the string

---
 ex-basics/src/string3.go | 33 ++++++++++++++++++++-------------
 1 file changed, 20 insertions(+), 13 deletions(-)

diff --git a/ex-basics/src/string3.go b/ex-basics/src/string3.go
index 67f7a30..c24f3cf 100644
--- a/ex-basics/src/string3.go
+++ b/ex-basics/src/string3.go
@@ -1,13 +1,20 @@
-package main
-
-import (
-	"fmt"
-)
-
-func main() {
-	s := "Шла Саша по шоссе"
-	r := []rune(s)
-	copy(r[4:4+3], []rune("abc"))
-	fmt.Printf("Before: %s\n", s);
-	fmt.Printf("After : %s\n", string(r))
-}
+package main
+
+import (
+	"fmt"
+	"unicode/utf8"
+)
+
+const minStrLen = 7
+
+func main() {
+	s := "Шла Саша по шоссе"
+	r := []rune(s)
+	if utf8.RuneCount([]byte(s)) < minStrLen {
+		fmt.Printf("The length of string is shorter than %d\n", minStrLen)
+		return
+	}
+	copy(r[4:4+3], []rune("abc"))
+	fmt.Printf("Before: %s\n", s);
+	fmt.Printf("After : %s\n", string(r))
+}