带文件IO的链接列表

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

struct link_list {
    char mail[50];
    int counter;
    struct link_list *next; 
               };

    typedef struct link_list node;

    void main()
    {
        FILE *fp ; 
        char string1[80]; 
        node *head=NULL; 
        int count_length=0; 
        char *fname = "email.txt";
        fp = fopen ( fname, "r" ) ;
        char line [ 128 ]; /* or other suitable maximum line size */
            int count=0;

        while ( fgets ( line, sizeof line, fp ) != NULL ) /* read a line */ 
        {
            count++;
            if(head==NULL)
            {
                head=(node *)malloc(sizeof(node));
                fscanf(fp,"%s",string1);
                strcpy(head->mail,string1);
                head->counter=count;
                head->next=NULL;
            }
            else
            {
                node *tmp = (node *)malloc(sizeof (node));
                fscanf(fp,"%s",string1);
                strcpy(tmp->mail,string1);
                tmp->next = head;
                tmp->counter=count;
                head = tmp;
            }
        }

        fclose(fp); fp = fopen ( fname, "r" ) ;
        fclose(fp);
        //printf("%d",count_length);
        getch();
    }