解析url

// parse url 解析 url c c++ 代码 rfc 2068
 
#include <stdio.h>
 #include <string.h>
 #include <stdlib.h>

 // 解析url，作为示例，很多情况没考虑，比如说user,pass之类的
 int parse_url(char *url, char **serverstrp, int *portp, char **pathstrp)
 {
     char buf[256];
     int serverlen, numread=0;

     // 跳过"http://" ，例"http://www.a.cn"->"www.a.cn"
     url = url+7;

     // 输入url直到遇到'/'和':'符号
     sscanf(url, "%255[^/:]", buf);
     serverlen = strlen(buf);
     *serverstrp = (char *)malloc(serverlen+1);
     strcpy(*serverstrp, buf);
     if(url[serverlen]==':')
     {
         // 获取port
         sscanf(&url[serverlen+1], "%d%n", portp, &numread);
         /* add one to go PAST it */
         
         numread++;
     }
     else
     {
         *portp = 80;
     }
     /* the path is a pointer into the rest of url */
     
     *pathstrp = &url[serverlen+numread];
     return 0;
 }

 int main()
 {
     char url[256] = "http://www.a.cn:80//index.html";
     char pathstr[256] = {'/0'};
     char szserverstrp[256] = {'/0'};
     char* serverstrp = szserverstrp;
     char* pathstrp = &pathstr[0];
     int port;

     parse_url(url,&serverstrp,&port,&pathstrp);
     printf("%s/n%s/n%d/n%s/n",url,serverstrp,port,pathstrp);

     return 0;
 }