C语言strstr函数解析自定义协议参数

1//返回当前子串在原字符串中的索引 
2int Sub_String_Index(char *str,char *sub_str)
3{
4    char *p1 = NULL ;
5    char *__str = str ;
6    char *__sub_str = sub_str ;
7    p1 = strstr(__str,__sub_str);
8    return  p1 - __str ;
9}

1#include <stdio.h>
 2#include <string.h>
 3//定义一个信息存储结构体
 4typedef struct device_net_info
 5{
 6    char wifi_ssid[20];
 7    char wifi_password[20]; 
 8    char server_ip[20];
 9    char server_port[10];
10}WIFI_INFO;
11
12WIFI_INFO wifi_info ;
13
14//返回当前子串在原字符串中的索引 
15int Sub_String_Index(char *str,char *sub_str)
16{
17    char *p1 = NULL ;
18    char *__str = str ;
19    char *__sub_str = sub_str ;
20    p1 = strstr(__str,__sub_str);
21    return  p1 - __str ;
22}
23
24int main(void) 
25{
26    int index1 = 0, index2 = 0; 
27    char *p1 = NULL ;
28    char *str = "SSID=602;PASSWORD=13602584536;";
29    char *str1 = "SERVER_IP=120.78.136.134;PORT=9002;";
30    //拷贝wifi ssid 
31    index1 = Sub_String_Index(str,"=");
32    index2 = Sub_String_Index(str,";");
33    memcpy(wifi_info.wifi_ssid,str+index1+1,index2-index1-1);
34    printf("ssid:%s\n",wifi_info.wifi_ssid);
35    //拷贝wifi password==>从分号的位置的下一个开始拷贝数据 
36    p1 = str+index2+1 ;
37    index1 = Sub_String_Index(p1,"=") ;
38    index2 = Sub_String_Index(p1,";") ;
39    memcpy(wifi_info.wifi_password,p1+index1+1,index2-index1-1);
40    printf("password:%s\n",wifi_info.wifi_password);
41    //拷贝server_ip
42    index1 = Sub_String_Index(str1,"=");
43    index2 = Sub_String_Index(str1,";");
44    memcpy(wifi_info.server_ip,str1+index1+1,index2-index1-1);
45    printf("server_ip:%s\n",wifi_info.server_ip);
46    //拷贝server_port 
47    p1 = str1+index2+1 ;
48    index1 = Sub_String_Index(p1,"=") ;
49    index2 = Sub_String_Index(p1,";") ;
50    memcpy(wifi_info.server_port,p1+index1+1,index2-index1-1);
51    printf("server_port:%s\n",wifi_info.server_port);
52    return 0 ;
53}