主要是上站时间，很难改。
编个小程序。
放在bbs的目录下，和.PASSWDS在一起。
会要求输入用户名（区分大小写）
显示用户名及上站时间
输入想修改后的上站时间
显示修改后的上站时间
如果想修改其它资料，请修改相应的地方。
#include "stdio.h"
#include "time.h"
#include "string.h"
#include "ctype.h"
#define PASSFILE ".PASSWDS"
#define STRLEN               80
#define IDLEN                12
#define PASSLEN                        14
#define NAMELEN              40
#define ENCPASSLEN         14
#define O_RDONLY "rb+"
struct userec {                  /* Structure used to hold information in */
        char            userid[IDLEN+2];
        time_t          firstlogin;
        char            lasthost[16];
        unsigned int    numlogins;
        unsigned int    numposts;
        unsigned int    nummedals; /* 奖章数 */
        unsigned int    money;   /* 存款 */
        unsigned int    bet;     /* 贷款 */
        time_t          dateforbet;
        char            flags[2];
#ifdef ENCPASSLEN
        char            passwd[ENCPASSLEN];
#else
        char            passwd[PASSLEN];
#endif
        char            username[NAMELEN];
        char            ident[NAMELEN];
        char            termtype[16];
        char            reginfo[STRLEN-16];
        unsigned int    userlevel;
        time_t          lastlogin;
        time_t          lastlogout;/* 最近离线时间 */
        time_t          stay;
        char            realname[NAMELEN];
        char            address[STRLEN];
        char            email[STRLEN-12];
        unsigned int    nummails;
        time_t          lastjustify;
        char            gender;
        unsigned char   birthyear;
        unsigned char   birthmonth;
        unsigned char   birthday;
        int             signature;
        unsigned int    userdefine;
        time_t          notedate;
        int             noteline;
} currentuser,tmp[500];
main()
{
int usernum=10;
char   *filename;
char   *rptr;
FILE   *fd;
char   uid[12];
int     size, id,i;
time_t   ustay;
        fd = fopen("./.PASSWDS", "rb+");
        rewind(fd);
printf("Please input the id:");
scanf("%s",uid);
printf("The info of '%s' is:\n",uid);
i=0;
while(!feof(fd))
{
        i++;
        fread(&tmp[i] , sizeof(currentuser),1,fd);
        if (strcmp(tmp[i].userid, uid)==0)
{
        printf("%12.12s\t",tmp[i].userid);
        printf("%ld\n",tmp[i].stay);
        printf("How much do you want it to be:\n");
        scanf("%ld",&ustay);
        printf("The time you input is : %ld",ustay);
        fseek(fd,-sizeof(currentuser),1);
        tmp[i].stay=ustay;
        fwrite(&tmp[i] , sizeof(currentuser),1,fd);
        printf("%12.12s\t",tmp[i].userid);
        printf("%ld\n",tmp[i].stay);
}
}
        fclose(fd);
}
  
--
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