[linux]linux c实现mac地址写入文件，实现删除和增加操作

功能描述

      c实现mac地址写入文件，实现删除和增加操作

代码实现

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int find_and_del_mac_from_old_file(char *mac)
{
    char tmpbuf[8192] = {0};
    char buf[8192] = {0};
    char cmd[9000] = {0};
    char *p = NULL;
    char *q = NULL;

        char result[8192] = {0};
    int ret = 0;
    FILE * fp = fopen("./hostapd_mac","r+");

    if(fp == NULL)
    {
        printf("error open : ./hostapd_mac \n");
        return 0;
    }
    else
    {
        fgets(buf,sizeof(buf),fp);
        printf("buf=%s\n",buf);

        if(p = strstr(buf,mac)) 
        {
                        printf("p=%s strlen(p)=%d\n",p,strlen(p));
                        printf("buf=%s \n",buf);
                     if(q = strstr(p,";")) 
            {
                q = q + 1;
                                strncpy(result,buf,strlen(buf) - strlen(p));
                                printf("q=%s\n",q);
                                printf("p=%s\n",p);
                                printf("result=%s\n",result);
                ret = 1;
            }
                        memset(cmd,0,sizeof(cmd));
                        snprintf(cmd, sizeof(cmd),"echo -n \"%s%s;\" > ./hostapd_mac", result,q);
                        system(cmd);
                        printf("delete mac is %s\n",mac);
        }
        fclose(fp);
    }

    return ret;
}

int add_black_mac_to_file(char *mac)
{
    char tmpbuf[8192] = {0};
    char buf[8192] = {0};
     char cmd[9000] = {0};
    char *p = NULL;

    FILE * fp = fopen("./hostapd_mac","a+");

    if(fp == NULL)
   {
        printf("error open : ./hostapd_mac \n");
        return 0;
   }
   else
   {
        fgets(buf,sizeof(buf),fp);
        if(p = strstr(buf,mac))
        {
                        printf("mac had existed in file\n");
            fclose(fp);
            return 1;
        } 
        else
        {
                        mac[18] = '\0';
            printf("buf=%s mac=%s\n",buf,mac);   
            sprintf(tmpbuf,"%s%s;",buf,mac);
            printf("tmpbuf=%s\n",tmpbuf);            
            if(strlen(tmpbuf) > 8100)
            {
                fclose(fp);
                system("rm -rf ./hostapd_black_mac");
                return 1;
            }
            snprintf(cmd, sizeof(cmd),"echo -n \"%s\" > ./hostapd_mac", tmpbuf);
            system(cmd);
        }
        fclose(fp);
    }

    return 0;
}

int main(int argc, char*argv[])
{
    char mac[18] = {0};
     if(argc == 3)
     {
        strncpy(mac,argv[1],17);
        printf("mac=%s\n",mac);
                if(strcmp(argv[2],"add") == 0)
                        add_black_mac_to_file(mac);

                if(strcmp(argv[2],"del") == 0)
                        find_and_del_mac_from_old_file(mac);
        printf("parm error\r\n");
    }
    return 0;

}