path: root/mbbsd/vote.c

/* $Id$ */
#include "bbs.h"

// XXX TODO bvote 跟實際的 vote control file 有時會不同步...
// XXX TODO 開票還是給獨立的 utility 或 daemon 去跑比較好

#define MAX_VOTE_NR (20)
#define MAX_VOTE_PAGE   (5)
#define ITEM_PER_PAGE   (30)

static const char * const STR_bv_control = "control";   /* 投票日期 選項 */
static const char * const STR_bv_desc    = "desc";  /* 投票目的 */
static const char * const STR_bv_ballots = "ballots";   /* 投的票 (per byte) */
static const char * const STR_bv_flags   = "flags";
static const char * const STR_bv_comments= "comments";  /* 投票者的建議 */
static const char * const STR_bv_limited = "limited";   /* 私人投票 */
static const char * const STR_bv_limits  = "limits";    /* 投票資格限制 */
static const char * const STR_bv_title   = "vtitle";

static const char * const STR_bv_results = "results";

// XXX TODO use macros to sync the length of strings above?
typedef struct {
    char control [sizeof("controlXX\0") ];
    char desc    [sizeof("descXX\0")    ];
    char ballots [sizeof("ballotsXX\0") ];
    char flags   [sizeof("flagsXX\0")   ];
    char comments[sizeof("commentsXX\0")];
    char limited [sizeof("limitedXX\0") ];
    char limits  [sizeof("limitsXX\0")  ];
    char title   [sizeof("vtitleXX\0")  ];
} vote_buffer_t;

static void
votebuf_init(vote_buffer_t *vbuf, int n)
{
    assert(vbuf);
    snprintf(vbuf->ballots, sizeof(vbuf->ballots), "%s%d", STR_bv_ballots, n);
    snprintf(vbuf->control, sizeof(vbuf->control), "%s%d", STR_bv_control, n);
    snprintf(vbuf->desc,    sizeof(vbuf->desc),    "%s%d", STR_bv_desc,    n);
    snprintf(vbuf->flags,   sizeof(vbuf->flags),   "%s%d", STR_bv_flags,   n);
    snprintf(vbuf->comments,sizeof(vbuf->comments),"%s%d", STR_bv_comments,n);
    snprintf(vbuf->limited, sizeof(vbuf->limited), "%s%d", STR_bv_limited, n);
    snprintf(vbuf->limits,  sizeof(vbuf->limits),  "%s%d", STR_bv_limits,  n);
    snprintf(vbuf->title,   sizeof(vbuf->title),   "%s%d", STR_bv_title,   n);
}

void
b_suckinfile(FILE * fp, const char *fname)
{
    FILE *sfp;
    char inbuf[256];

    if ((sfp = fopen(fname, "r"))) {

    while (fgets(inbuf, sizeof(inbuf), sfp))
        fputs(inbuf, fp);
    fclose(sfp);
    }
}

void
b_suckinfile_invis(FILE * fp, const char *fname, const char *boardname)
{
    FILE           *sfp;

    if ((sfp = fopen(fname, "r"))) {
    char            inbuf[256];
    if(fgets(inbuf, sizeof(inbuf), sfp))
    {
        /* first time, try if boardname revealed. */
        char *post = strstr(inbuf, str_post1);
        if(!post) post = strstr(inbuf, str_post2);
        if(post) 
        post = strstr(post, boardname);
        if(post) {
        /* found releaved stuff. */
        /*
        // mosaic method 1
        while(*boardname++)
            *post++ = '?';
            */
        // mosaic method 2
        strcpy(post, "(某隱形看板)\n");
        }
        fputs(inbuf, fp);
        while (fgets(inbuf, sizeof(inbuf), sfp))
        fputs(inbuf, fp);
    }
    fclose(sfp);
    }
}

static void
b_count(const char *buf, int counts[], short item_num, int *total)
{
    short       choice;
    int             fd;

    memset(counts, 0, item_num * sizeof(counts[0]));
    *total = 0;
    if ((fd = open(buf, O_RDONLY)) != -1) {
    flock(fd, LOCK_EX); /* Thor: 防止多人同時算 */
    while (read(fd, &choice, sizeof(short)) == sizeof(short)) {
        if (choice >= item_num)
        continue;
        counts[choice]++;
        (*total)++;
    }
    flock(fd, LOCK_UN);
    close(fd);
    }
}

static int
b_nonzeroNum(const char *buf)
{
    int             i = 0;
    char            inchar;
    int             fd;

    if ((fd = open(buf, O_RDONLY)) != -1) {
    while (read(fd, &inchar, 1) == 1)
        if (inchar)
        i++;
    close(fd);
    }
    return i;
}

static void
vote_report(const char *bname, const char *fname, char *fpath)
{
    register char  *ip;
    time4_t         dtime;
    int             fd, bid;
    fileheader_t    header;

    ip = fpath;
    while (*(++ip));
    *ip++ = '/';

    /* get a filename by timestamp */

    dtime = now;
    for (;;) {
        /* TODO: extract record.c:stampfile_u() to common lib */
    sprintf(ip, "M.%d.A.%3.3X", (int)++dtime, (unsigned int)(random() & 0xFFF));
    fd = open(fpath, O_CREAT | O_EXCL | O_WRONLY, 0644);
    if (fd >= 0)
        break;
    dtime++;
    }
    close(fd);

    /* XXX: FIXME: Possible race condition */
    unlink(fpath);
    link(fname, fpath);

    /* append record to .DIR */

    memset(&header, 0, sizeof(fileheader_t));
    strlcpy(header.owner, "[馬路探子]", sizeof(header.owner));
    snprintf(header.title, sizeof(header.title), "[%s] 看板 選情報導", bname);
    {
    struct tm ptime;

    localtime4_r(&dtime, &ptime);
    snprintf(header.date, sizeof(header.date),
         "%2d/%02d", ptime.tm_mon + 1, ptime.tm_mday);
    }
    strlcpy(header.filename, ip, sizeof(header.filename));

    strcpy(ip, FN_DIR);
    if ((fd = open(fpath, O_WRONLY | O_CREAT, 0644)) >= 0) {
    flock(fd, LOCK_EX);
    lseek(fd, 0, SEEK_END);
    write(fd, &header, sizeof(fileheader_t));
    flock(fd, LOCK_UN);
    close(fd);
    if ((bid = getbnum(bname)) > 0)
        setbtotal(bid);

    }
}

static void
b_result_one(const vote_buffer_t *vbuf, boardheader_t * fh, int *total)
{
    FILE           *cfp, *tfp, *frp, *xfp;
    char           *bname;
    char            inbuf[ANSILINELEN];
    int            *counts;
    int             people_num;
    short       item_num, junk;
    char            b_control   [PATHLEN];
    char            b_newresults[PATHLEN];
    char            b_report    [PATHLEN];
    char            buf     [PATHLEN];
    time4_t         closetime;

    if (fh->bvote > 0)
    fh->bvote--;

    bname = fh->brdname;

    setbfile(buf, bname, vbuf->control);
    cfp = fopen(buf, "r");
    assert(cfp);
    fscanf(cfp, "%hd,%hd\n%d\n", &item_num, &junk, &closetime);
    fclose(cfp);

    // prevent death caused by a bug, it should be remove later.
    if (item_num <= 0)
    return;

    // XXX TODO backup vote files?

    counts = (int *)malloc(item_num * sizeof(int));

    setbfile(b_control, bname, "tmp");
    if (rename(buf, b_control) == -1)
    return;
    setbfile(buf, bname, vbuf->flags);
    people_num = b_nonzeroNum(buf);
    unlink(buf);
    setbfile(buf, bname, vbuf->ballots);
    b_count(buf, counts, item_num, total);
    unlink(buf);

    setbfile(b_newresults, bname, "newresults");
    if ((tfp = fopen(b_newresults, "w")) == NULL)
    return;

    setbfile(buf, bname, vbuf->title);

    if ((xfp = fopen(buf, "r"))) {
    fgets(inbuf, sizeof(inbuf), xfp);
    fprintf(tfp, "%s\n◆ 投票名稱: %s\n\n", msg_seperator, inbuf);
    fclose(xfp);
    }
    fprintf(tfp, "%s\n◆ 投票中止於: %s\n\n\n◆ 票選題目描述:\n\n",
        msg_seperator, Cdate(&closetime));
    fh->vtime = now;

    setbfile(buf, bname, vbuf->desc);

    b_suckinfile(tfp, buf);
    unlink(buf);

    if ((cfp = fopen(b_control, "r"))) {
    fgets(inbuf, sizeof(inbuf), cfp);
    fgets(inbuf, sizeof(inbuf), cfp);
    fprintf(tfp, "\n◆投票結果:(共有 %d 人投票,每人最多可投 %hd 票)\n",
        people_num, junk);
    fprintf(tfp, "    選    項                                   總票數  得票率  得票分布\n");
    for (junk = 0; junk < item_num; junk++) {
        fgets(inbuf, sizeof(inbuf), cfp);
        chomp(inbuf);
        fprintf(tfp, "    %-42s %3d 票 %6.2f%%  %6.2f%%\n", inbuf + 3, counts[junk],                
            (float)(counts[junk] * 100) / (float)(people_num),
            (float)(counts[junk] * 100) / (float)(*total));
    }
    fclose(cfp);
    }
    unlink(b_control);
    free(counts);

    fprintf(tfp, "%s\n◆ 使用者建議：\n\n", msg_seperator);
    setbfile(buf, bname, vbuf->comments);
    b_suckinfile(tfp, buf);
    unlink(buf);

    fprintf(tfp, "%s\n◆ 總票數 = %d 票\n\n", msg_seperator, *total);
    fclose(tfp);

    setbfile(b_report, bname, "report");
    if ((frp = fopen(b_report, "w"))) {
    b_suckinfile(frp, b_newresults);
    fclose(frp);
    }
    setbpath(inbuf, bname);
    vote_report(bname, b_report, inbuf);
    if (!(fh->brdattr & (BRD_NOCOUNT|BRD_HIDE))) { // from ptt2 local modification
    setbpath(inbuf, "Record");
    vote_report(bname, b_report, inbuf);
    }
    unlink(b_report);

    tfp = fopen(b_newresults, "a");
    setbfile(buf, bname, STR_bv_results);
    b_suckinfile(tfp, buf);
    fclose(tfp);
    Rename(b_newresults, buf);
}

static void
b_result(boardheader_t * fh)
{
    FILE           *cfp;
    time4_t         closetime;
    int             i, total;
    char            buf[STRLEN];
    char            temp[STRLEN];
    vote_buffer_t   vbuf;

    for (i = 0; i < MAX_VOTE_NR; i++) {
    votebuf_init(&vbuf, i);
    setbfile(buf, fh->brdname, vbuf.control);
    cfp = fopen(buf, "r");
    if (!cfp)
        continue;
    fgets(temp, sizeof(temp), cfp);
    fscanf(cfp, "%d\n", &closetime);
    fclose(cfp);
    if (closetime < now)
        b_result_one(&vbuf, fh, &total);
    }
}

static int
b_close(boardheader_t * fh)
{
    b_result(fh);
    return 1;
}

static int
b_closepolls(void)
{
    boardheader_t  *fhp;
    int             pos;

#ifndef BARRIER_HAS_BEEN_IN_SHM
    char    *fn_vote_polling = ".polling";
    unsigned long  last;
    FILE           *cfp;
    /* XXX necessary to lock ? */
    if ((cfp = fopen(fn_vote_polling, "r"))) {
    char timebuf[100];
    fgets(timebuf, sizeof(timebuf), cfp);
    sscanf(timebuf, "%lu", &last);
    fclose(cfp);
    if (last + 3600 >= (unsigned long)now)
        return 0;
    }
    if ((cfp = fopen(fn_vote_polling, "w")) == NULL)
    return 0;
    fprintf(cfp, "%d\n%s\n\n", now, Cdate(&now));
    fclose(cfp);
#endif

    for (fhp = bcache, pos = 1; pos <= numboards; fhp++, pos++) {
    if (fhp->bvote && b_close(fhp)) {
        if (substitute_record(fn_board, fhp, sizeof(*fhp), pos) == -1)
        outs(err_board_update);
        else
        reset_board(pos);
    }
    }

    return 0;
}

void
auto_close_polls(void)
{
    /* 最多一天開票一次 */
    if (now - SHM->close_vote_time > DAY_SECONDS) {
    b_closepolls();
    SHM->close_vote_time = now;
    }
}

static int
vote_view(const vote_buffer_t *vbuf, const char *bname)
{
    boardheader_t  *fhp;
    FILE           *fp;
    char            buf[STRLEN], genbuf[STRLEN], inbuf[STRLEN];
    short       item_num, i;
    int             num = 0, pos, *counts, total;
    time4_t         closetime;

    setbfile(buf, bname, vbuf->ballots);
    if ((num = dashs(buf)) < 0) /* file size */
    num = 0;

    setbfile(buf, bname, vbuf->title);
    move(0, 0);
    clrtobot();

    if ((fp = fopen(buf, "r"))) {
    fgets(inbuf, sizeof(inbuf), fp);
    prints("\n投票名稱: %s", inbuf);
    fclose(fp);
    }
    setbfile(buf, bname, vbuf->control);
    fp = fopen(buf, "r");

    assert(fp);
    fscanf(fp, "%hd,%hd\n%d\n", &item_num, &i, &closetime);
    counts = (int *)malloc(item_num * sizeof(int));

    prints("\n◆ 預知投票紀事: 每人最多可投 %d 票,目前共有 %d 票,\n"
       "本次投票將結束於 %s\n", atoi(inbuf), (int)(num / sizeof(short)),
       Cdate(&closetime));

    /* Thor: 開放 票數 預知 */
    setbfile(buf, bname, vbuf->flags);
    prints("共有 %d 人投票\n", b_nonzeroNum(buf));

    setbfile(buf, bname, vbuf->ballots);
    b_count(buf, counts, item_num, &total);

    total = 0;

    for (i = num = 0; i < item_num; i++, num++) {
    fgets(inbuf, sizeof(inbuf), fp);
    chomp(inbuf);
    inbuf[30] = '\0';   /* truncate */
    move(num % 15 + 6, num / 15 * 40);
    prints("  %-32s%3d 票", inbuf, counts[i]);
    total += counts[i];
    if (num == 29) {
        num = -1;
        pressanykey();
        move(6, 0);
        clrtobot();
    }
    }
    fclose(fp);
    free(counts);
    pos = getbnum(bname);
    assert(0<=pos-1 && pos-1<MAX_BOARD);
    fhp = bcache + pos - 1;
    move(t_lines - 3, 0);
    prints("◆ 目前總票數 = %d 票", total);
    getdata(b_lines - 1, 0, "(A)取消投票 (B)提早開票 (C)繼續？[C] ", genbuf,
        4, LCECHO);
    if (genbuf[0] == 'a') {
    getdata(b_lines - 1, 0, "請再次確認取消投票 (Y/N) [N] ", genbuf,
        4, LCECHO);
    if (genbuf[0] == 'n')
        return FULLUPDATE;

    setbfile(buf, bname, vbuf->control);
    unlink(buf);
    setbfile(buf, bname, vbuf->flags);
    unlink(buf);
    setbfile(buf, bname, vbuf->ballots);
    unlink(buf);
    setbfile(buf, bname, vbuf->desc);
    unlink(buf);
    setbfile(buf, bname, vbuf->limited);
    unlink(buf);
    setbfile(buf, bname, vbuf->limits);
    unlink(buf);
    setbfile(buf, bname, vbuf->title);
    unlink(buf);

    if (fhp->bvote > 0)
        fhp->bvote--;

    if (substitute_record(fn_board, fhp, sizeof(*fhp), pos) == -1)
        outs(err_board_update);
    reset_board(pos);
    } else if (genbuf[0] == 'b') {
    b_result_one(vbuf, fhp, &total);
    if (substitute_record(fn_board, fhp, sizeof(*fhp), pos) == -1)
        outs(err_board_update);

    reset_board(pos);
    }
    return FULLUPDATE;
}

static int
vote_view_all(const char *bname)
{
    int             i;
    int             x = -1;
    FILE           *fp, *xfp;
    char            buf[STRLEN], genbuf[STRLEN];
    char            inbuf[80];
    vote_buffer_t   vbuf;

    move(0, 0);
    for (i = 0; i < MAX_VOTE_NR; i++) {
    votebuf_init(&vbuf, i);
    setbfile(buf, bname, vbuf.control);
    if ((fp = fopen(buf, "r"))) {
        prints("(%d) ", i);
        x = i;
        fclose(fp);

        setbfile(buf, bname, vbuf.title);
        if ((xfp = fopen(buf, "r"))) {
        fgets(inbuf, sizeof(inbuf), xfp);
        fclose(xfp);
        } else
        strlcpy(inbuf, "無標題", sizeof(inbuf));
        prints("%s\n", inbuf);
    }
    }

    if (x < 0)
    return FULLUPDATE;

    snprintf(buf, sizeof(buf), "要看幾號投票 [%d] ", x);
    getdata(b_lines - 1, 0, buf, genbuf, 4, LCECHO);


    if (atoi(genbuf) < 0 || atoi(genbuf) > MAX_VOTE_NR)
    snprintf(genbuf, sizeof(genbuf), "%d", x);

    votebuf_init(&vbuf, atoi(genbuf));
    setbfile(buf, bname, vbuf.control);

    if (dashf(buf)) {
    return vote_view(&vbuf, bname);
    } else
    return FULLUPDATE;
}

static int
vote_maintain(const char *bname)
{
    FILE           *fp = NULL;
    char            inbuf[STRLEN], buf[STRLEN];
    int             num = 0, aborted, pos, x, i;
    time4_t         closetime;
    boardheader_t  *fhp;
    char            genbuf[4];
    vote_buffer_t   vbuf;

    if (!(currmode & MODE_BOARD))
    return 0;
    if ((pos = getbnum(bname)) <= 0)
    return 0;

    assert(0<=pos-1 && pos-1<MAX_BOARD);
    fhp = bcache + pos - 1;

    if (fhp->bvote != 0) {

    getdata(b_lines - 1, 0,
        "(V)觀察目前投票 (M)舉辦新投票 (A)取消所有投票 (Q)繼續 [Q]",
        genbuf, 4, LCECHO);
    if (genbuf[0] == 'v')
        return vote_view_all(bname);
    else if (genbuf[0] == 'a') {
        fhp->bvote = 0;

        for (i = 0; i < MAX_VOTE_NR; i++) {
        int j;
        char buf2[64];
        const char *filename[] = {
            STR_bv_ballots, STR_bv_control, STR_bv_desc, STR_bv_desc,
            STR_bv_flags, STR_bv_comments, STR_bv_limited, STR_bv_limits,
            STR_bv_title, NULL
        };
        for (j = 0; filename[j] != NULL; j++) {
            snprintf(buf2, sizeof(buf2), "%s%d", filename[j], i);
            setbfile(buf, bname, buf2);
            unlink(buf);
        }
        }
        if (substitute_record(fn_board, fhp, sizeof(*fhp), pos) == -1)
        outs(err_board_update);

        return FULLUPDATE;
    } else if (genbuf[0] != 'm') {
        if (fhp->bvote >= MAX_VOTE_NR)
        vmsg("不得舉辦過多投票");
        return FULLUPDATE;
    }
    }

    x = 1;
    do {
    votebuf_init(&vbuf, x);
    setbfile(buf, bname, vbuf.control);
    x++;
    } while (dashf(buf) && x <= MAX_VOTE_NR);

    --x;
    if (x >= MAX_VOTE_NR)
    return FULLUPDATE;

    getdata(b_lines - 1, 0,
        "確定要舉辦投票嗎？ [y/N]: ",
        inbuf, 4, LCECHO);
    if (inbuf[0] != 'y')
    return FULLUPDATE;

    vs_hdr("舉辦投票");
    votebuf_init(&vbuf, x);

    clear();
    move(0, 0);
    prints("第 %d 號投票\n", x);
    setbfile(buf, bname, vbuf.title);
    getdata(4, 0, "請輸入投票名稱:", inbuf, 50, DOECHO);
    if (inbuf[0] == '\0')
    strlcpy(inbuf, "不知名的", sizeof(inbuf));
    fp = fopen(buf, "w");
    assert(fp);
    fputs(inbuf, fp);
    fclose(fp);

    vmsg("按任何鍵開始編輯此次 [投票宗旨]");
    setbfile(buf, bname, vbuf.desc);
    aborted = veditfile(buf);
    if (aborted == EDIT_ABORTED) {
    vmsg("取消此次投票");
    return FULLUPDATE;
    }
    aborted = 0;
    setbfile(buf, bname, vbuf.flags);
    unlink(buf);

    getdata(4, 0,
        "是否限定投票者名單：(y)編輯可投票人員名單[n]任何人皆可投票:[N]",
        inbuf, 2, LCECHO);
    setbfile(buf, bname, vbuf.limited);
    if (inbuf[0] == 'y') {
    fp = fopen(buf, "w");
    assert(fp);
    //fprintf(fp, "此次投票設限");
    fclose(fp);
    friend_edit(FRIEND_CANVOTE);
    } else {
    if (dashf(buf))
        unlink(buf);
    }
    getdata(5, 0,
        "是否限定投票資格：(y)限制投票資格[n]不設限:[N]",
        inbuf, 2, LCECHO);
    setbfile(buf, bname, vbuf.limits);
    if (inbuf[0] == 'y') {
    fp = fopen(buf, "w");
    assert(fp);
    do {
        getdata(6, 0, "註冊時間限制 (以'月'為單位，0~120)：", inbuf, 4, DOECHO);
        closetime = atoi(inbuf);    // borrow variable
    } while (closetime < 0 || closetime > 120);
    fprintf(fp, "%d\n", now - (MONTH_SECONDS * closetime));
    do {
        getdata(6, 0, "上站次數下限", inbuf, 6, DOECHO);
        closetime = atoi(inbuf);    // borrow variable
    } while (closetime < 0);
    fprintf(fp, "%d\n", closetime);
    do {
        getdata(6, 0, "文章篇數下限", inbuf, 6, DOECHO);
        closetime = atoi(inbuf);    // borrow variable
    } while (closetime < 0);
    fprintf(fp, "%d\n", closetime);
    fclose(fp);
    } else {
    if (dashf(buf))
        unlink(buf);
    }
    clear();
    getdata(0, 0, "此次投票進行幾天 (一到三十天)？", inbuf, 4, DOECHO);

    closetime = atoi(inbuf);
    if (closetime <= 0)
    closetime = 1;
    else if (closetime > 30)
    closetime = 30;

    closetime = closetime * DAY_SECONDS + now;
    setbfile(buf, bname, vbuf.control);
    fp = fopen(buf, "w");
    assert(fp);
    fprintf(fp, "000,000\n%d\n", closetime);

    outs("\n請依序輸入選項, 按 ENTER 完成設定");
    num = 0;
    x = 0;  /* x is the page number */
    while (!aborted) {
    if( num % 15 == 0 ){
        for( i = num ; i < num + 15 ; ++i ){
        move((i % 15) + 2, (i / 15) * 40);
        prints(ANSI_COLOR(1;30) "%c)" ANSI_RESET " ", i + 'A');
        }
    }
    snprintf(buf, sizeof(buf), "%c) ", num + 'A');
    getdata((num % 15) + 2, (num / 15) * 40, buf,
        inbuf, 37, DOECHO);
    if (*inbuf) {
        fprintf(fp, "%1c) %s\n", (num + 'A'), inbuf);
        num++;
    }
    if ((*inbuf == '\0' && num >= 1) || x == MAX_VOTE_PAGE)
        aborted = 1;
    if (num == ITEM_PER_PAGE) {
        x++;
        num = 0;
    }
    }
    snprintf(buf, sizeof(buf), "請問每人最多可投幾票？([1]～%d): ", x * ITEM_PER_PAGE + num);

    getdata(t_lines - 3, 0, buf, inbuf, 3, DOECHO);

    if (atoi(inbuf) <= 0 || atoi(inbuf) > (x * ITEM_PER_PAGE + num)) {
    inbuf[0] = '1';
    inbuf[1] = 0;
    }

    rewind(fp);
    fprintf(fp, "%3d,%3d\n", x * ITEM_PER_PAGE + num, MAX(1, atoi(inbuf)));
    fclose(fp);

    fhp->bvote++;

    if (substitute_record(fn_board, fhp, sizeof(*fhp), pos) == -1)
    outs(err_board_update);
    reset_board(pos);
    outs("開始投票了！");

    return FULLUPDATE;
}

static int
vote_flag(const vote_buffer_t *vbuf, const char *bname, char val)
{
    char            buf[256], flag;
    int             fd, num, size;

    num = usernum - 1;
    setbfile(buf, bname, vbuf->flags);
    if ((fd = open(buf, O_RDWR | O_CREAT, 0600)) == -1)
    return -1;
    size = lseek(fd, 0, SEEK_END);
    memset(buf, 0, sizeof(buf));
    while (size <= num) {
    write(fd, buf, sizeof(buf));
    size += sizeof(buf);
    }
    lseek(fd, num, SEEK_SET);
    read(fd, &flag, 1);
    if (flag == 0 && val != 0) {
    lseek(fd, num, SEEK_SET);
    write(fd, &val, 1);
    }
    close(fd);
    return flag;
}

static int
user_vote_one(const vote_buffer_t *vbuf, const char *bname)
{
    FILE           *cfp;
    char            buf[STRLEN], redo;
    boardheader_t  *fhp;
    short       count, tickets;
    short       curr_page, item_num, max_page;
    char            inbuf[80], choices[ITEM_PER_PAGE+1], vote[4], *chosen;
    time4_t         closetime;

    // bid = boaord id, must be at least one int.
    // fd should be int.
    int         bid = 0, i = 0;
    int         fd = 0;

    // initialize board info
    if ((bid = getbnum(bname)) <= 0)
    return 0;
    assert(0<=bid-1 && bid-1<MAX_BOARD);
    fhp = getbcache(bid);

    setbfile(buf, bname, vbuf->limited);    /* Ptt */
    if (dashf(buf)) {
    setbfile(buf, bname, FN_CANVOTE);
    if (!file_exist_record(buf, cuser.userid)) {
        vmsg("對不起! 這是私人投票..你並沒有受邀唷!");
        return FULLUPDATE;
    } else {
        vmsg("恭喜你受邀此次私人投票.   <檢視此次受邀名單>");
        more(buf, YEA);
    }
    }
    setbfile(buf, bname, vbuf->limits);
    if (dashf(buf)) {
    int limits_logins, limits_posts;
    FILE * lfp = fopen(buf, "r");
    assert(lfp);
    fscanf(lfp, "%d%d%d", &closetime, &limits_logins, &limits_posts);
    fclose(lfp);
    // XXX if this is a private vote (limited), I think we don't need to check limits?
    if (cuser.firstlogin > closetime || cuser.numposts < limits_posts ||
        cuser.numlogins < limits_logins) {
        vmsg("你不夠資深喔！");
        return FULLUPDATE;
    }
    }
    if (vote_flag(vbuf, bname, '\0')) {
    vmsg("此次投票，你已投過了！");
    return FULLUPDATE;
    }
    setutmpmode(VOTING);
    setbfile(buf, bname, vbuf->desc);
    more(buf, YEA);

    vs_hdr("投票箱");

    setbfile(buf, bname, vbuf->control);
    cfp = fopen(buf, "r");
    if (!cfp)
    {
    vmsg("抱歉，此投票已取消或無效。");
    return FULLUPDATE;
    }

    assert(cfp);
    fscanf(cfp, "%hd,%hd\n%d\n", &item_num, &tickets, &closetime);
    chosen = (char *)malloc(item_num+100); // XXX dirty fix 板主增加選項的問題
    memset(chosen, 0, item_num+100);
    memset(choices, 0, sizeof(choices));
    max_page = (item_num - 1)/ ITEM_PER_PAGE + 1;

    outs("投票方式：確定好您的選擇後，輸入其代碼(A, B, C...)即可。\n");
    prints("此次投票你可以投 %1hd 票。按 0 取消投票, 1 完成投票, "
        "> 下一頁, < 上一頁\n此次投票將結束於：%s \n\n",
       tickets, Cdate(&closetime));

#define REDO_DRAW   1
#define REDO_SCAN   2
    redo = REDO_DRAW;
    curr_page = 0;
    while (1) {

    if (redo) {
        int i, j;
        move(5, 0);
        clrtobot();

        /* 想不到好方法 因為不想整個讀進 memory
         * 而且大部分的投票不會超過一頁 所以再從檔案 scan */
        /* XXX 投到一半板主增加選項則 chosen 太小 */
        if (redo & REDO_SCAN) {
        for (i = 0; i < curr_page; i++)
            for (j = 0; j < ITEM_PER_PAGE; j++)
            fgets(inbuf, sizeof(inbuf), cfp);
        }

        count = 0;
        for (i = 0; i < ITEM_PER_PAGE && fgets(inbuf, sizeof(inbuf), cfp); i++) {
        chomp(inbuf);
        move((count % 15) + 5, (count / 15) * 40);
        prints("%c%s", chosen[curr_page * ITEM_PER_PAGE + i] ? '*' : ' ',
            inbuf);
        choices[count % ITEM_PER_PAGE] = inbuf[0];
        count++;
        }
        redo = 0;
    }

    vote[0] = vote[1] = '\0';
    move(t_lines - 2, 0);
    prints("你還可以投 %2d 票   [ 目前所在頁數 %2d / 共 %2d 頁 (可輸入 '<' '>' 換頁) ]", tickets - i, curr_page + 1, max_page);
    getdata(t_lines - 4, 0, "輸入您的選擇: ", vote, sizeof(vote), DOECHO);
    *vote = toupper(*vote);

#define CURRENT_CHOICE \
    chosen[curr_page * ITEM_PER_PAGE + vote[0] - 'A']
    if (vote[0] == '0' || (!vote[0] && !i)) {
        outs("記得再來投喔!!");
        break;
    } else if (vote[0] == '1' && i);
    else if (!vote[0])
        continue;
    else if (vote[0] == '<' && max_page > 1) {
        curr_page = (curr_page + max_page - 1) % max_page;
            rewind(cfp);
        fgets(inbuf, sizeof(inbuf), cfp);
            fgets(inbuf, sizeof(inbuf), cfp);
        redo = REDO_DRAW | REDO_SCAN;
        continue;
    }
    else if (vote[0] == '>' && max_page > 1) {
        curr_page = (curr_page + 1) % max_page;
        if (curr_page == 0) {
        rewind(cfp);
        fgets(inbuf, sizeof(inbuf), cfp);
        fgets(inbuf, sizeof(inbuf), cfp);
        }
        redo = REDO_DRAW;
        continue;
    }
    else if (index(choices, vote[0]) == NULL)   /* 無效 */
        continue;
    else if ( CURRENT_CHOICE ) { /* 已選 */
        move(((vote[0] - 'A') % 15) + 5, (((vote[0] - 'A')) / 15) * 40);
        outc(' ');
        CURRENT_CHOICE = 0;
        i--;
        continue;
    } else {
        if (i == tickets)
        continue;
        move(((vote[0] - 'A') % 15) + 5, (((vote[0] - 'A')) / 15) * 40);
        outc('*');
        CURRENT_CHOICE = 1;
        i++;
        continue;
    }

    if (vote_flag(vbuf, bname, vote[0]) != 0)
        outs("重複投票! 不予計票。");
    else {
        setbfile(buf, bname, vbuf->ballots);
        if ((fd = open(buf, O_WRONLY | O_CREAT | O_APPEND, 0600)) == 0)
        outs("無法投入票匭\n");
        else {
        struct stat     statb;
        char            buf[3], mycomments[3][74], b_comments[80];

        for (i = 0; i < 3; i++)
            strlcpy(mycomments[i], "\n", sizeof(mycomments[i]));

        flock(fd, LOCK_EX);
        for (count = 0; count < item_num; count++) {
            if (chosen[count])
            write(fd, &count, sizeof(short));
        }
        flock(fd, LOCK_UN);
        fstat(fd, &statb);
        close(fd);
        getdata(b_lines - 2, 0,
            "您對這次投票有什麼寶貴的意見嗎？(y/n)[N]",
            buf, 3, DOECHO);
        if (buf[0] == 'Y' || buf[0] == 'y') {
            do {
            move(5, 0);
            clrtobot();
            outs("請問您對這次投票有什麼寶貴的意見？"
                 "最多三行，按[Enter]結束");
            for (i = 0; (i < 3) &&
                 getdata(7 + i, 0, "：",
                     mycomments[i], sizeof(mycomments[i]),
                     DOECHO); i++);
            getdata(b_lines - 2, 0, "(S)儲存 (E)重新來過 "
                "(Q)取消？[S]", buf, 3, LCECHO);
            } while (buf[0] == 'e');
            if (buf[0] == 'q')
            break;
            setbfile(b_comments, bname, vbuf->comments);
            if (mycomments[0][0])
            {
            FILE *fcm = fopen(b_comments, "a");
            if (fcm) {
                fprintf(fcm,
                    ANSI_COLOR(36) "○使用者" ANSI_COLOR(1;36) " %s "
                    ANSI_COLOR(;36) "的建議：" ANSI_RESET "\n",
                    cuser.userid);
                for (i = 0; i < 3; i++)
                fprintf(fcm, "    %s\n", mycomments[i]);
                fprintf(fcm, "\n");
                fclose(fcm);
            }
            }
        }
        move(b_lines - 1, 0);
        outs("已完成投票！\n");
        }
    }
    break;
    }
    free(chosen);
    fclose(cfp);
    pressanykey();
    return FULLUPDATE;
}

static int
user_vote(const char *bname)
{
    int             bid;
    boardheader_t  *bh;
    char            buf[STRLEN];
    FILE           *fp;
    int             i, x = -1;
    char            genbuf[STRLEN];
    char            inbuf[80];
    vote_buffer_t   vbuf;

    if ((bid = getbnum(bname)) <= 0)
    return 0;

    assert(0<=bid-1 && bid-1<MAX_BOARD);
    bh = getbcache(bid);

    clear();

    if (bh->bvote == 0) {
    vmsg("目前並沒有任何投票舉行。");
    return FULLUPDATE;
    }
    if (!HasUserPerm(PERM_LOGINOK)) {
    vmsg("對不起! 您未完成註冊程序, 還沒有投票權喔!");
    return FULLUPDATE;
    }

    // XXX I think such loop is ineffective...
    // According to the creation code, the vote is ranged as [1..MAX_VOTE_NR]
    for (i = 1; i <= MAX_VOTE_NR; i++) {
    votebuf_init(&vbuf, i);
    setbfile(buf, bname, vbuf.control);
    if (!dashf(buf))
        continue;

    x = i;
    prints("(%d) ", x);

    setbfile(buf, bname, vbuf.title);
    fp = fopen(buf, "r");
    if (fp) {
        fgets(inbuf, sizeof(inbuf), fp);
        fclose(fp);
    } else {
        strlcpy(inbuf, "無標題", sizeof(inbuf));
    }
    prints("%s\n", inbuf);
    }

    if (x < 0)
    return FULLUPDATE;

    snprintf(buf, sizeof(buf), "要投幾號投票 [%d] ", x);
    getdata(b_lines - 1, 0, buf, genbuf, 4, LCECHO);
    i = atoi(genbuf);

    // x: default (max), i: user selection
    if (i < 1 || i > MAX_VOTE_NR)
    i = x;

    votebuf_init(&vbuf, i);
    return user_vote_one(&vbuf, bname);
}

static int
vote_results(const char *bname)
{
    char            buf[STRLEN];

    setbfile(buf, bname, STR_bv_results);
    if (more(buf, YEA) == -1)
    vmsg("目前沒有任何投票的結果。");
    return FULLUPDATE;
}

int
b_vote_maintain(void)
{
    return vote_maintain(currboard);
}

int
b_vote(void)
{
    return user_vote(currboard);
}

int
b_results(void)
{
    return vote_results(currboard);
}