(筆記) 如何使用C語言實現split()? (C/C++) (C) (JavaScript)

Abstract
寫過JavaScript或ASP的朋友，應該常常用到split()這個函數，他可以輕易地將string轉成array，C語言並沒有相對應的函數，只有strtok()較為接近，稍微加工後，就可以在C語言實現split()。

Introduction
使用環境 : IE 7.0 + Visual Studio 2008

在JavaScript，可以輕易的將string轉成array。

split.htm / JavaScript

1 
9 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
10 <html xmlns="http://www.w3.org/1999/xhtml">
11 <head>
12   <script language="javascript" type="text/javascript">
13     function Button1_onclick() {
14       str = "10,20,30";
15       arr = str.split(",");
16
17       for(i=0; i < 3; i++)
18         document.getElementById("div1").innerHTML += arr[i] + "<br>";
19     }
20   </script>
21 </head>
22 <body>
23   <input id="Button1" type="button" value="button" onclick="return Button1_onclick()" />
24   <div id="div1">
25   </div>
26 </body>
27 </html>

split.c / C

1 /*
2 (C) OOMusou 2009 http://oomusou.cnblogs.com
3
4 Filename    : split.c
5 Compiler    : Visual C++ 9.0
6 Description : Demo how to implement split() in C
7 Release     : 05/09/2009 1.0
8 */
9
10 #include <stdio.h>
11 #include <string.h>
12
13 void split(char **arr, char *str, const char *del) {
14   char *s = strtok(str, del);
15
16   while(s != NULL) {
17     *arr++ = s;
18     s = strtok(NULL, del);
19   }
20 }
21
22 int main() {
23   char *str = "10,20,30";
24   char *arr[3];
25   const char *del = ",";
26   int i = 0;
27   split(arr, str, del);
28
29   while(i<3)
30     printf("%s\n", *(arr+i++));
31 }

執行結果
split