很简单的结构体返回值访问问题；绕不出来，帮忙给看看是什么问题，或者有更好的办法解析字符串也可以，谢谢

#include <stdio.h>
#include <string.h>
char IP_config[100]= "IPv4:192.168.200.245,Mask:255.255.255.245,Gateway:192.168.200.255,DHCP:0,VlanFlag:0,VlanID:0";
char IP_config2[100]= "IPv4:192.168.20.10,Mask:255.255.255.0,Gateway:192.168.20.1,DHCP:0,VlanFlag:0,VlanID:10";
typedef struct
{
    /* data */
    char *a;
    char *b;
} st;
st struct_test_func(char *str){
//    char *mask_     = strstr(str,"Mask");
//    char *gateway_  = strstr(str,"Gateway");
    st tt;
    //get the ip number string
    int i=0,j=0;
    char IPtemp[16];
    str=str+5;
    while(*str!=','){
        IPtemp[i] =*str;
        i++;str++;
    }
    str++;
    IPtemp[i]='\0';
    char ipstr[16]="";
    tt.a = IPtemp;
    printf("ip   %s\r\n",tt.a);

    //get the mask number string
    i=0;str=str+5;
    char MaskTemp[16];
    while(*str!=','){
        MaskTemp[i] =*str;
        i++;str++;
    }
    str++;
    MaskTemp[i]='\0';
    tt.b =MaskTemp;
    printf("mask   %s\r\n",tt.b);
    return tt;
}
int main() {
    st mm = struct_test_func(IP_config);
    printf("%s\r\n%s\r\n",mm.a,mm.b);
    st mm2 = struct_test_func(IP_config2);
    printf("%s\r\n%s\r\n",mm2.a,mm2.b);
    return 0;
  
}


打印结果怎么不对呢，谢谢；对指针又忘了，指点一下，谢谢



ip   192.168.200.245
mask   255.255.255.245
╔
帻a
ip   192.168.20.10
mask   255.255.255.0
╔
帻a
--
FROM 111.206.214.*