/* $Id$ */
/* 開獎的 utility */
#define _UTIL_C_
#include "bbs.h"
static char *betname[8] = {"Ptt", "Jaky", "Action", "Heat",
"DUNK", "Jungo", "waiting", "wofe"};
#define MAX_DES 7 /* 最大保留獎數 */
int Link(const char *src, const char *dst)
{
char cmd[200];
if (link(src, dst) == 0)
return 0;
sprintf(cmd, "/bin/cp -R %s %s", src, dst);
return system(cmd);
}
int main(int argc, char **argv)
{
int money, bet, n, total = 0, ticket[8] =
{0, 0, 0, 0, 0, 0, 0, 0};
FILE *fp;
time4_t now = (time4_t)time(NULL);
char des[MAX_DES][200] =
{"", "", "", ""};
nice(10);
attach_SHM();
if(passwd_init())
exit(1);
rename(BBSHOME "/etc/" FN_TICKET_RECORD,
BBSHOME "/etc/" FN_TICKET_RECORD ".tmp");
rename(BBSHOME "/etc/" FN_TICKET_USER,
BBSHOME "/etc/" FN_TICKET_USER ".tmp");
if (!(fp = fopen(BBSHOME "/etc/"FN_TICKET_RECORD ".tmp", "r")))
return 0;
fscanf(fp, "%9d %9d %9d %9d %9d %9d %9d %9d\n",
&ticket[0], &ticket[1], &ticket[2], &ticket[3],
&ticket[4], &ticket[5], &ticket[6], &ticket[7]);
for (n = 0; n < 8; n++)
total += ticket[n];
fclose(fp);
if (!total)
return 0;
if((fp = fopen(BBSHOME "/etc/" FN_TICKET , "r")))
{
for (n = 0; n < MAX_DES && fgets(des[n], 200, fp); n++) ;
fclose(fp);
}
srandom(33); // 固定一個 seed 但盡量要避免跟別人的seed同
for( n = (now / (60*60*3)) - 62820; n >0; n--) random();
/*
* 正確的random number generator的用法
* 是用同一個 seed後取 第一個 第二個 地三個.... 數
* srand() 設完seed後
* 每呼叫一次rand()就取下一個數
*
* 但因為我們沒有記錄上次取到第幾個
* 所以用每增四小時()就多取一次 => now / (60*60*4) (每五小時開一次獎)
* (減 61820 是減少 loop 數)
*
* 本來是用srand(time(0)) 不是正確的用法
* 因為開獎時間有規率 所以會被找出規律
*
* ~Ptt
*/
bet=random() % 8;
/* 以上的說法及 code 並沒比 srand(time(0)) 好. 甚至更好預測. */
//XXX: resolve_utmp();
attach_SHM();
bet = SHM->UTMPnumber % 8;
/* FIXME 現在完全依 UTMPnumber 取值, 並沒用到 random function.
* 小站的 UTMPnumber 可視為定值... */
/*
*
* 若要以rand inplement 整數的亂數 要注意以下 (man page中有)
*
* In Numerical Recipes in C: The Art of Scientific Computing
* (William H. Press, Brian P. Flannery, Saul A. Teukolsky,
* William T. Vetterling; New York: Cambridge University
* Press, 1990 (1st ed, p. 207)), the following comments are
* made:
* "If you want to generate a random integer between 1
* and 10, you should always do it by
*
* j=1+(int) (10.0*rand()/(RAND_MAX+1.0));
*
* and never by anything resembling
*
* j=1+((int) (1000000.0*rand()) % 10);
*
* (which uses lower-order bits)."
*
* Random-number generation is a complex topic. The Numeri-
* cal Recipes in C book (see reference above) provides an
* excellent discussion of practical random-number generation
* issues in Chapter 7 (Random Numbers).
* ~ Ptt
*/
money = ticket[bet] ? total * 95 / ticket[bet] : 9999999;
if((fp = fopen(BBSHOME "/etc/" FN_TICKET, "w")))
{
if (des[MAX_DES - 1][0])
n = 1;
else
n = 0;
for (; n < MAX_DES && des[n][0] != 0; n++)
{
fprintf(fp, des[n]);
}
printf("\n\n開獎時間： %s \n\n"
"開獎結果： %s \n\n"
"下注總金額： %d00 元 \n"
"中獎比例： %d張/%d張 (%f)\n"
"每張中獎彩票可得 %d 枚Ｐ幣 \n\n",
Cdatelite(&now), betname[bet], total, ticket[bet], total,
(float) ticket[bet] / total, money);
fprintf(fp, "%s 賭盤開出:%s 總金額:%d00 元 獎金/張:%d 元 機率:%1.2f\n",
Cdatelite(&now), betname[bet], total, money,
(float) ticket[bet] / total);
fclose(fp);
}
if (ticket[bet] && (fp = fopen(BBSHOME "/etc/" FN_TICKET_USER ".tmp", "r")))
{
int mybet, num, uid;
char userid[20], genbuf[200];
fileheader_t mymail;
while (fscanf(fp, "%s %d %d\n", userid, &mybet, &num) != EOF)
{
if (mybet == bet)
{
printf("恭喜 %-15s買了%9d 張 %s, 獲得 %d 枚Ｐ幣\n"
,userid, num, betname[mybet], money * num);
if((uid=searchuser(userid, userid))==0) continue;
deumoney(uid, money * num);
sprintf(genbuf, BBSHOME "/home/%c/%s", userid[0], userid);
stampfile(genbuf, &mymail);
strcpy(mymail.owner, BBSNAME);
sprintf(mymail.title, "[%s] 中獎囉! $ %d", Cdatelite(&now), money * num);
unlink(genbuf);
Link(BBSHOME "/etc/ticket", genbuf);
sprintf(genbuf, BBSHOME "/home/%c/%s/.DIR", userid[0], userid);
append_record(genbuf, &mymail, sizeof(mymail));
}
}
}
unlink(BBSHOME "/etc/" FN_TICKET_RECORD ".tmp");
unlink(BBSHOME "/etc/" FN_TICKET_USER ".tmp");
return 0;
}
