path: root/mbbsd/read.c

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

static fileheader_t *headers = NULL;
static int      last_line; // PTT: last_line 游標可指的最後一個
static int      hit_thread;

#include <sys/mman.h>

/* ----------------------------------------------------- */
/* Tag List 標籤                                         */
/* ----------------------------------------------------- */
void
UnTagger(int locus)
{
    if (locus > TagNum)
    return;

    TagNum--;

    if (TagNum > locus)
    memcpy(&TagList[locus], &TagList[locus + 1],
           (TagNum - locus) * sizeof(TagItem));
}

int
Tagger(time_t chrono, int recno, int mode)
{
    int             head, tail, posi = 0, comp;

    for (head = 0, tail = TagNum - 1, comp = 1; head <= tail;) {
    posi = (head + tail) >> 1;
    comp = TagList[posi].chrono - chrono;
    if (!comp) {
        break;
    } else if (comp < 0) {
        head = posi + 1;
    } else {
        tail = posi - 1;
    }
    }

    if (mode == TAG_NIN) {
    if (!comp && recno) /* 絕對嚴謹：連 recno 一起比對 */
        comp = recno - TagList[posi].recno;
    return comp;

    }
    if (!comp) {
    if (mode != TAG_TOGGLE)
        return NA;

    TagNum--;
    memcpy(&TagList[posi], &TagList[posi + 1],
           (TagNum - posi) * sizeof(TagItem));
    } else if (TagNum < MAXTAGS) {
    TagItem        *tagp, buf[MAXTAGS];

    tail = (TagNum - head) * sizeof(TagItem);
    tagp = &TagList[head];
    memcpy(buf, tagp, tail);
    tagp->chrono = chrono;
    tagp->recno = recno;
    memcpy(++tagp, buf, tail);
    TagNum++;
    } else {
    bell();
    return 0;       /* full */
    }
    return YEA;
}


void
EnumTagName(char *fname, int locus)
{
    snprintf(fname, sizeof(fname), "M.%d.A", (int)TagList[locus].chrono);
}

void
EnumTagFhdr(fileheader_t * fhdr, char *direct, int locus)
{
    get_record(direct, fhdr, sizeof(fileheader_t), TagList[locus].recno);
}

/* -1 : 取消 */
/* 0 : single article */
/* ow: whole tag list */

int
AskTag(char *msg)
{
    char            buf[80];
    int             num;

    num = TagNum;
    snprintf(buf, sizeof(buf), "◆ %s A)文章 T)標記 Q)uit?", msg);
    switch (rget(b_lines - 1, buf)) {
    case 'q':
    num = -1;
    break;
    case 'a':
    num = 0;
    }
    return num;
}


#include <sys/mman.h>

#define BATCH_SIZE      65536

char           *
f_map(char *fpath, int *fsize)
{
    int             fd, size;
    struct stat     st;

    if ((fd = open(fpath, O_RDONLY)) < 0)
    return (char *)-1;

    if (fstat(fd, &st) || !S_ISREG(st.st_mode) || (size = st.st_size) <= 0) {
    close(fd);
    return (char *)-1;
    }
    fpath = (char *)mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
    close(fd);
    *fsize = size;
    return fpath;
}


static int
TagThread(char *direct)
{
    int             fsize, count;
    char           *title, *fimage;
    fileheader_t   *head, *tail;

    fimage = f_map(direct, &fsize);
    if (fimage == (char *)-1)
    return DONOTHING;

    head = (fileheader_t *) fimage;
    tail = (fileheader_t *) (fimage + fsize);
    count = 0;
    do {
    count++;
    title = subject(head->title);
    if (!strncmp(currtitle, title, TTLEN)) {
        if (!Tagger(atoi(head->filename + 2), count, TAG_INSERT))
        break;
    }
    } while (++head < tail);

    munmap(fimage, fsize);
    return FULLUPDATE;
}


int
TagPruner(int bid)
{
    boardheader_t  *bp=NULL;
    assert(bid >= 0);   /* bid == 0 means in mailbox */
    if (bid){
    bp = getbcache(bid);
    if (strcmp(bp->brdname, "Security") == 0)
        return DONOTHING;
    }
    if (TagNum && ((currstat != READING) || (currmode & MODE_BOARD))) {
    if (getans("刪除所有標記[N]?") != 'y')
        return READ_REDRAW;
#ifdef SAFE_ARTICLE_DELETE
        if(bp && bp->nuser>20)
            safe_delete_range(currdirect, 0, 0);
        else
#endif
        delete_range(currdirect, 0, 0);
    TagNum = 0;
    if (bid)
        setbtotal(bid);
    return NEWDIRECT;
    }
    return DONOTHING;
}


/* ----------------------------------------------------- */
/* cursor & reading record position control              */
/* ----------------------------------------------------- */
keeploc_t      *
getkeep(char *s, int def_topline, int def_cursline)
{
    static struct keeploc_t *keeplist = NULL;
    struct keeploc_t *p;

    if (def_cursline >= 0)
    for (p = keeplist; p; p = p->next) {
        if (!strcmp(s, p->key)) {
        if (p->crs_ln < 1)
            p->crs_ln = 1;
        return p;
        }
    }
    else
    def_cursline = -def_cursline;
    p = (keeploc_t *) malloc(sizeof(keeploc_t));
    assert(p);
    p->key = (char *)malloc(strlen(s) + 1);
    assert(p->key);
    strcpy(p->key, s);
    p->top_ln = def_topline;
    p->crs_ln = def_cursline;
    p->next = keeplist;
    return (keeplist = p);
}

void
fixkeep(char *s, int first)
{
    keeploc_t      *k;

    k = getkeep(s, 1, 1);
    if (k->crs_ln >= first) {
    k->crs_ln = (first == 1 ? 1 : first - 1);
    k->top_ln = (first < 11 ? 1 : first - 10);
    }
}

/* calc cursor pos and show cursor correctly */
static int
cursor_pos(keeploc_t * locmem, int val, int from_top)
{
    int             top;

    if (val > last_line) {
    bell();
    val = last_line;
    }
    if (val <= 0) {
    bell();
    val = 1;
    }
    top = locmem->top_ln;
    if (val >= top && val < top + p_lines) {
    cursor_clear(3 + locmem->crs_ln - top, 0);
    locmem->crs_ln = val;
    cursor_show(3 + val - top, 0);
    return DONOTHING;
    }
    locmem->top_ln = val - from_top;
    if (locmem->top_ln <= 0)
    locmem->top_ln = 1;
    locmem->crs_ln = val;
    return PARTUPDATE;
}

static int
move_cursor_line(keeploc_t * locmem, int mode)
{
    int             top, crs;
    int             reload = 0;

    top = locmem->top_ln;
    crs = locmem->crs_ln;
    if (mode == READ_PREV) {
    if (crs <= top) {
        top -= p_lines - 1;
        if (top < 1)
        top = 1;
        reload = 1;
    }
    if (--crs < 1) {
        crs = 1;
        reload = -1;
    }
    } else if (mode == READ_NEXT) {
    if (crs >= top + p_lines - 1) {
        top += p_lines - 1;
        reload = 1;
    }
    if (++crs > last_line) {
        crs = last_line;
        reload = -1;
    }
    }
    locmem->top_ln = top;
    locmem->crs_ln = crs;
    return reload;
}

static int
thread(keeploc_t * locmem, int stype)
{
    static char     a_ans[32], t_ans[32];
    char            ans[32], s_pmt[64];
    register char  *tag, *query = NULL;
    register int    now, pos, match, near = 0;
    fileheader_t    fh;
    int             circulate_flag = 1; /* circulate at end or begin */
    int             fd = -1;

    match = hit_thread = 0;
    now = pos = locmem->crs_ln;
    if (stype == 'A') {
    if (!*currowner)
        return DONOTHING;
    str_lower(a_ans, currowner);
    query = a_ans;
    circulate_flag = 0;
    stype = 0;
    } else if (stype == 'a') {
    if (!*currowner)
        return DONOTHING;
    str_lower(a_ans, currowner);
    query = a_ans;
    circulate_flag = 0;
    stype = RS_FORWARD;
    } else if (stype == '/') {
    if (!*t_ans)
        return DONOTHING;
    query = t_ans;
    circulate_flag = 0;
    stype = RS_TITLE | RS_FORWARD;
    } else if (stype == '?') {
    if (!*t_ans)
        return DONOTHING;
    circulate_flag = 0;
    query = t_ans;
    stype = RS_TITLE;
    } else if (stype & RS_RELATED) {
    tag = headers[pos - locmem->top_ln].title;
    if (stype & RS_CURRENT) {
        if (stype & RS_FIRST) {
        if (!strncmp(currtitle, tag, TTLEN))
            return DONOTHING;
        near = 0;
        }
        query = currtitle;
    } else {
        query = subject(tag);
        if (stype & RS_FIRST) {
        if (query == tag)
            return DONOTHING;
        near = 0;
        }
    }
    } else if (!(stype & RS_THREAD)) {
    query = (stype & RS_TITLE) ? t_ans : a_ans;
    if (!*query && query == a_ans) {
        if (*currowner)
        strlcpy(a_ans, currowner, sizeof(a_ans));
        else if (*currauthor)
        strlcpy(a_ans, currauthor, sizeof(a_ans));
    }
    snprintf(s_pmt, sizeof(s_pmt),
         "%s搜尋%s [%s] ", (stype & RS_FORWARD) ? "往後" : "往前",
         (stype & RS_TITLE) ? "標題" : "作者", query);
    getdata(b_lines - 1, 0, s_pmt, ans, sizeof(ans), DOECHO);
    if (*ans)
        strcpy(query, ans);
    else if (*query == '\0')
        return DONOTHING;
    }
    tag = fh.owner;

    do {
    if (!circulate_flag || stype & RS_RELATED) {
        if (stype & RS_FORWARD) {
        if (++now > last_line){
            if( fd != -1 )
            close(fd);
            return DONOTHING;
        }
        } else {
        if (--now <= 0 || now < pos - 200) {
            if( fd )
            close(fd);
            if ((stype & RS_FIRST) && (near)) {
            hit_thread = 1;
            return cursor_pos(locmem, near, 10);
            }
            return DONOTHING;
        }
        }
    } else {
        if (stype & RS_FORWARD) {
        if (++now > last_line)
            now = 1;
        } else if (--now <= 0)
        now = last_line;
    }

    get_record_keep(currdirect, &fh, sizeof(fileheader_t), now, &fd);

    if (fh.owner[0] == '-')
        continue;

    if (stype & RS_THREAD) {
        if (strncasecmp(fh.title, str_reply, 3)) {
        hit_thread = 1;
        if( fd )
            close(fd);
        return cursor_pos(locmem, now, 10);
        }
        continue;
    }
    if (stype & RS_TITLE)
        tag = subject(fh.title);

    if (((stype & RS_RELATED) && !strncmp(tag, query, 40)) ||
        (!(stype & RS_RELATED) && ((query == currowner) ?
                       !strcmp(tag, query) :
                       strstr_lower(tag, query)))) {
        if ((stype & RS_FIRST) && tag != fh.title) {
        near = now;
        continue;
        }
        hit_thread = 1;
        match = cursor_pos(locmem, now, 10);
        if ((!(stype & RS_CURRENT)) &&
        (stype & RS_RELATED) &&
        strncmp(currtitle, query, TTLEN)) {
        strncpy(currtitle, query, TTLEN);
        match = PARTUPDATE;
        }
        break;
    }
    } while (now != pos);

    if( fd != -1 )
    close(fd);
    return match;
}


#ifdef INTERNET_EMAIL
static void
mail_forward(fileheader_t * fhdr, char *direct, int mode)
{
    int             i;
    char            buf[STRLEN];
    char           *p;

    strncpy(buf, direct, sizeof(buf));
    if ((p = strrchr(buf, '/')))
    *p = '\0';
    switch (i = doforward(buf, fhdr, mode)) {
    case 0:
    outmsg(msg_fwd_ok);
    break;
    case -1:
    outmsg(msg_fwd_err1);
    break;
    case -2:
    outmsg(msg_fwd_err2);
    break;
    default:
    break;
    }
    refresh();
    sleep(1);
}
#endif

static int
select_read(keeploc_t * locmem, int sr_mode)
{
#define READSIZE 64  // 8192 / sizeof(fileheader_t)
    char           *tag, *query = NULL, *temp;
    fileheader_t    fhs[READSIZE];
    char            fpath[80], genbuf[MAXPATHLEN], buf3[5];
    static char     t_ans[TTLEN + 1] = "";
    static char     a_ans[TTLEN + 1] = "";
    int             fd, fr, size = sizeof(fileheader_t), i, len;
    struct stat     st;
    /* rocker.011018: make a reference number for process article */
    int             reference = 0;

    if ((currmode & MODE_SELECT))
    return -1;
    if (sr_mode == RS_TITLE)
    query = subject(headers[locmem->crs_ln - locmem->top_ln].title);
    else if (sr_mode == RS_NEWPOST) {
    strlcpy(buf3, "Re: ", sizeof(buf3));
    query = buf3;
    } 
    else if (sr_mode == RS_THREAD) {
    
    } else {
    char            buff[80];
    char            newdata[35];

    query = (sr_mode == RS_RELATED) ? t_ans : a_ans;
    snprintf(buff, sizeof(buff), "搜尋%s [%s] ",
         (sr_mode == RS_RELATED) ? "標題" : "作者", query);
    getdata(b_lines, 0, buff, newdata, sizeof(newdata), DOECHO);
    if (newdata[0])
        strcpy(query, newdata);
    if (!(*query))
        return DONOTHING;
    }

    if ((fd = open(currdirect, O_RDONLY, 0)) != -1) {
    snprintf(genbuf, sizeof(genbuf), "SR.%s", cuser.userid);
    if (currstat == RMAIL)
        sethomefile(fpath, cuser.userid, genbuf);
    else
        setbfile(fpath, currboard, genbuf);
    if (((fr = open(fpath, O_WRONLY | O_CREAT | O_TRUNC, 0600)) != -1)) {
        switch (sr_mode) {
        case RS_TITLE:
        while( (len = read(fd, fhs, sizeof(fhs))) > 0 ){
            len /= sizeof(fileheader_t);
            for( i = 0 ; i < len ; ++i ){
            ++reference;
            tag = subject(fhs[i].title);
            if (!strncmp(tag, query, 40)) {
                fhs[i].money = reference | FHR_REFERENCE;
                write(fr, &fhs[i], size);
            }
            }
        }
        break;
        case RS_RELATED:
        while( (len = read(fd, fhs, sizeof(fhs))) > 0 ){
            len /= sizeof(fileheader_t);
            for( i = 0 ; i < len ; ++i ){
            ++reference;
            tag = fhs[i].title;
            if (strcasestr(tag, query)) {
                fhs[i].money = reference | FHR_REFERENCE;
                write(fr, &fhs[i], size);
            }
            }
        }
        break;
        case RS_NEWPOST:
        while( (len = read(fd, fhs, sizeof(fhs))) > 0 ){
            len /= sizeof(fileheader_t);
            for( i = 0 ; i < len ; ++i ){
            ++reference;
            tag = fhs[i].title;
            temp = strstr(tag, query);
            if (temp == NULL || temp != tag) {
                fhs[i].money = reference | FHR_REFERENCE;
                write(fr, &fhs[i], size);
            }
            }
        }
        break;
        case RS_AUTHOR:
        while( (len = read(fd, fhs, sizeof(fhs))) > 0 ){
            len /= sizeof(fileheader_t);
            for( i = 0 ; i < len ; ++i ){
            ++reference;
            tag = fhs[i].owner;
            if (strcasestr(tag, query)) {
                fhs[i].money = reference | FHR_REFERENCE;
                write(fr, &fhs[i], size);
            }
            }
        }
        break;
        case RS_THREAD:
        while( (len = read(fd, fhs, sizeof(fhs))) > 0 ){
            len /= sizeof(fileheader_t);
            for( i = 0 ; i < len ; ++i ){
            ++reference;
            if (fhs[i].filemode & FILE_MARKED) {
                fhs[i].money = reference | FHR_REFERENCE;
                write(fr, &fhs[i], size);
            }
            }
        }
        break;
        }
        fstat(fr, &st);
        close(fr);
    }
    close(fd);
    if (st.st_size) {
        currmode |= MODE_SELECT;
        strlcpy(currdirect, fpath, sizeof(currdirect));
    }
    }
    return READ_REDRAW;
}

static int
i_read_key(onekey_t * rcmdlist, keeploc_t * locmem, int ch, int bid, int bottom_line)
{
    int             mode = DONOTHING;
    int num;
    char direct[60];
    switch (ch) {
    case 'q':
    case 'e':
    case KEY_LEFT:
    if(currmode & MODE_SELECT){
        char genbuf[256];
        fileheader_t *fhdr = &headers[locmem->crs_ln - locmem->top_ln];
        board_select();
        setbdir(genbuf, currboard);
        locmem = getkeep(genbuf, 0, 1);
        locmem->crs_ln = getindex(genbuf, fhdr->filename, sizeof(fileheader_t));
        num = locmem->crs_ln - p_lines + 1;
        locmem->top_ln = num < 1 ? 1 : num;

        return NEWDIRECT;
    }
    return (currmode & MODE_ETC) ? board_etc() :
        (currmode & MODE_DIGEST) ? board_digest() : DOQUIT;
    case Ctrl('L'):
    redoscr();
    break;
    case Ctrl('H'):
    if (select_read(locmem, RS_NEWPOST))
        return NEWDIRECT;
    else
        return READ_REDRAW;
    case 'a':
    case 'A':
    if (select_read(locmem, RS_AUTHOR))
        return NEWDIRECT;
    else
        return READ_REDRAW;

    case 'G':
    if (select_read(locmem,RS_THREAD)) /* marked articles */
        return NEWDIRECT;
    else    
        return READ_REDRAW;

    case '/':
    case '?':
    if (select_read(locmem, RS_RELATED))
        return NEWDIRECT;
    else
        return READ_REDRAW;
    case 'S':
    if (select_read(locmem, RS_TITLE))
        return NEWDIRECT;
    else
        return READ_REDRAW;
    /* quick search title first */
    case '=':
    return thread(locmem, RELATE_FIRST);
    case '\\':
    return thread(locmem, CURSOR_FIRST);
    /* quick search title forword */
    case ']':
    return thread(locmem, RELATE_NEXT);
    case '+':
    return thread(locmem, CURSOR_NEXT);
    /* quick search title backword */
    case '[':
    return thread(locmem, RELATE_PREV);
    case '-':
    return thread(locmem, CURSOR_PREV);
    case '<':
    case ',':
    return thread(locmem, THREAD_PREV);
    case '.':
    case '>':
    return thread(locmem, THREAD_NEXT);
    case 'p':
    case 'k':
    case KEY_UP:
    return cursor_pos(locmem, locmem->crs_ln - 1, p_lines - 2);
    case 'n':
    case 'j':
    case KEY_DOWN:
    return cursor_pos(locmem, locmem->crs_ln + 1, 1);
    case ' ':
    case KEY_PGDN:
    case 'N':
    case Ctrl('F'):
    if (last_line >= locmem->top_ln + p_lines) {
        if (last_line > locmem->top_ln + p_lines)
        locmem->top_ln += p_lines;
        else
        locmem->top_ln += p_lines - 1;
        locmem->crs_ln = locmem->top_ln;
        return PARTUPDATE;
    }
    cursor_clear(3 + locmem->crs_ln - locmem->top_ln, 0);
    locmem->crs_ln = last_line;
    cursor_show(3 + locmem->crs_ln - locmem->top_ln, 0);
    break;
    case KEY_PGUP:
    case Ctrl('B'):
    case 'P':
    if (locmem->top_ln > 1) {
        locmem->top_ln -= p_lines;
        if (locmem->top_ln <= 0)
        locmem->top_ln = 1;
        locmem->crs_ln = locmem->top_ln;
        return PARTUPDATE;
    }
    break;
    case KEY_END:
    case '$':
    if (last_line >= locmem->top_ln + p_lines) {
        locmem->top_ln = last_line - p_lines + 1;
        if (locmem->top_ln <= 0)
        locmem->top_ln = 1;
        locmem->crs_ln = last_line;
        return PARTUPDATE;
    }
    cursor_clear(3 + locmem->crs_ln - locmem->top_ln, 0);
    locmem->crs_ln = last_line;
    cursor_show(3 + locmem->crs_ln - locmem->top_ln, 0);
    break;
    case 'F':
    case 'U':
    if (HAS_PERM(PERM_FORWARD)) {
        mail_forward(&headers[locmem->crs_ln - locmem->top_ln],
             currdirect, ch /* == 'U' */ );
        /* by CharlieL */
        return READ_REDRAW;
    }
    break;
    case Ctrl('Q'):
    return my_query(headers[locmem->crs_ln - locmem->top_ln].owner);
    case Ctrl('S'):
    if (HAS_PERM(PERM_ACCOUNTS)) {
        int             id;
        userec_t        muser;

        strlcpy(currauthor,
            headers[locmem->crs_ln - locmem->top_ln].owner,
            sizeof(currauthor));
        stand_title("使用者設定");
        move(1, 0);
        if ((id = getuser(headers[locmem->crs_ln - locmem->top_ln].owner))) {
        memcpy(&muser, &xuser, sizeof(muser));
        user_display(&muser, 1);
        uinfo_query(&muser, 1, id);
        }
        return FULLUPDATE;
    }
    break;

    /* rocker.011018: 採用新的tag模式 */
    case 't':
    /* 將原本在 Read() 裡面的 "TagNum = 0" 移至此處 */
    if ((currstat & RMAIL && TagBoard != 0) ||
        (!(currstat & RMAIL) && TagBoard != bid)) {
        if (currstat & RMAIL)
        TagBoard = 0;
        else
        TagBoard = bid;
        TagNum = 0;
    }
    /* rocker.011112: 解決再select mode標記文章的問題 */
    if (Tagger(atoi(headers[locmem->crs_ln - locmem->top_ln].filename + 2),
           (currmode & MODE_SELECT) ?
     (headers[locmem->crs_ln - locmem->top_ln].money & ~FHR_REFERENCE) :
           locmem->crs_ln, TAG_TOGGLE))
        return POS_NEXT;
    return DONOTHING;

    case Ctrl('C'):
    if (TagNum) {
        TagNum = 0;
        return FULLUPDATE;
    }
    return DONOTHING;

    case Ctrl('T'):
    return TagThread(currdirect);
    case Ctrl('D'):
    return TagPruner(bid);
    case '\n':
    case '\r':
    case 'l':
    case KEY_RIGHT:
    ch = 'r';
    default:
    if( ch == 'h' && currmode & (MODE_ETC | MODE_DIGEST) )
        return DONOTHING;
    if (ch > 0 && ch <= onekey_size) {
        int (*func)() = rcmdlist[ch - 1];
        if (func != NULL)
             {
                num  = locmem->crs_ln - bottom_line;
                if (num>0)
                 {
                  sprintf(direct,"%s.bottom", currdirect);
          mode = (*func)(num, &headers[locmem->crs_ln-locmem->top_ln], 
                                direct);
                 }
                else
                  mode = (*func)(locmem->crs_ln, 
                        &headers[locmem->crs_ln - locmem->top_ln], currdirect);
             }
            break;
    }
    }
    return mode;
}

int
get_records_and_bottom(char *direct,  fileheader_t* headers,
                     int recbase, int p_lines, int last_line, int bottom_line)
{
    int n = bottom_line - recbase + 1, rv;
    char directbottom[60];

    if(n>=p_lines || (currmode & (MODE_SELECT | MODE_DIGEST)))
      return get_records(direct, headers, sizeof(fileheader_t), recbase, 
                  p_lines);

    sprintf(directbottom, "%s.bottom", direct);
    if (n<=0)
      return get_records(directbottom, headers, sizeof(fileheader_t), 1-n, 
                  last_line-recbase + 1);
      
     rv = get_records(direct, headers, sizeof(fileheader_t), recbase, n);

     if(bottom_line<last_line)
       rv += get_records(directbottom, headers+n, sizeof(fileheader_t), 1, 
                            p_lines - n );
     return rv;
} 
void
i_read(int cmdmode, char *direct, void (*dotitle) (), void (*doentry) (), onekey_t * rcmdlist, int bidcache)
{
    keeploc_t      *locmem = NULL;
    int             recbase = 0, mode, ch;
    int             num = 0, entries = 0, n_bottom=0;
    int             i;
    int             jump = 0;
    char            genbuf[4];
    char            currdirect0[64];
    int             last_line0 = last_line;
    int             bottom_line = 0;
    int             hit_thread0 = hit_thread;
    fileheader_t   *headers0 = headers;

    strlcpy(currdirect0, currdirect, sizeof(currdirect0));
#define FHSZ    sizeof(fileheader_t)
    /* Ptt: 這邊 headers 可以針對看板的最後 60 篇做 cache */
    headers = (fileheader_t *) calloc(p_lines, FHSZ);
    strlcpy(currdirect, direct, sizeof(currdirect));
    mode = NEWDIRECT;

    do {
    /* 依據 mode 顯示 fileheader */
    setutmpmode(cmdmode);
    switch (mode) {
    case NEWDIRECT: /* 第一次載入此目錄 */
    case DIRCHANGED:
        if (bidcache > 0 && !(currmode & (MODE_SELECT | MODE_DIGEST))){
        if( (last_line = getbtotal(currbid)) == 0 ){
            setbtotal(currbid);
                    setbottomtotal(currbid);
            last_line = getbtotal(currbid);
        }
                bottom_line = last_line;
                last_line += (n_bottom = getbottomtotal(currbid)); 
        }
        else
        bottom_line = last_line = get_num_records(currdirect, FHSZ);

        if (mode == NEWDIRECT) {
        if (last_line == 0) {
            outs("沒有任何文章..\n");
        }
        num = last_line - p_lines + 1;
        locmem = getkeep(currdirect, num < 1 ? 1 : num, last_line);
        }
        recbase = -1;

    case FULLUPDATE:
        (*dotitle) ();

    case PARTUPDATE:
        if (last_line < locmem->top_ln + p_lines) {
        if (bidcache > 0 && !(currmode & (MODE_SELECT | MODE_DIGEST)))
            {
             bottom_line = getbtotal(currbid);
             num = bottom_line+getbottomtotal(currbid);
            }
        else
            num = get_num_records(currdirect, FHSZ);

        if (last_line != num) {
            last_line = num;
            recbase = -1;
        }
        }
        if (last_line == 0)
        goto return_i_read;
        else if (recbase != locmem->top_ln) {
        recbase = locmem->top_ln;
        if (recbase > last_line) {
            recbase = last_line - p_lines + 1;
            if (recbase < 1)
            recbase = 1;
            locmem->top_ln = recbase;
        }
                entries=get_records_and_bottom(currdirect,
                           headers, recbase, p_lines, last_line, bottom_line);
        }
        if (locmem->crs_ln > last_line)
        locmem->crs_ln = last_line;
        move(3, 0);
        clrtobot();
    case PART_REDRAW:
        move(3, 0);
        for (i = 0; i < entries; i++)
        (*doentry) (locmem->top_ln + i, &headers[i]);
    case READ_REDRAW:
        outmsg(curredit & EDIT_ITEM ?
           "\033[44m 私人收藏 \033[30;47m 繼續? \033[m" :
           curredit & EDIT_MAIL ? msg_mailer : MSG_POSTER);
        break;
    case TITLE_REDRAW:
        (*dotitle) ();
             break;
    case READ_PREV:
    case READ_NEXT:
    case RELATE_PREV:
    case RELATE_NEXT:
    case RELATE_FIRST:
    case POS_NEXT:
    case 'A':
    case 'a':
    case '/':
    case '?':
        jump = 1;
        break;
    }

    /* 讀取鍵盤，加以處理，設定 mode */
    if (!jump) {
        assert(3 + locmem->crs_ln - locmem->top_ln>=0); // FIXME dunno why
        cursor_show(3 + locmem->crs_ln - locmem->top_ln, 0);
        ch = egetch();
        mode = DONOTHING;
    } else
        ch = ' ';

    if (mode == POS_NEXT) {
        mode = cursor_pos(locmem, locmem->crs_ln + 1, 1);
        if (mode == DONOTHING)
        mode = PART_REDRAW;
        jump = 0;
    } else if (ch >= '0' && ch <= '9') {
        if ((i = search_num(ch, last_line)) != -1)
        mode = cursor_pos(locmem, i + 1, 10);
    } else {
        if (!jump)
        mode = i_read_key(rcmdlist, locmem, ch, currbid, 
                      bottom_line);
        while (mode == READ_NEXT || mode == READ_PREV ||
           mode == RELATE_FIRST || mode == RELATE_NEXT ||
           mode == RELATE_PREV || mode == THREAD_NEXT ||
           mode == THREAD_PREV || mode == 'A' || mode == 'a' ||
           mode == '/' || mode == '?') {
        int             reload;

        if (mode == READ_NEXT || mode == READ_PREV)
            reload = move_cursor_line(locmem, mode);
        else {
            reload = thread(locmem, mode);
            if (!hit_thread) {
            mode = FULLUPDATE;
            break;
            }
        }

        if (reload == -1) {
            mode = FULLUPDATE;
            break;
        } else if (reload) {
            recbase = locmem->top_ln;

                    entries=get_records_and_bottom(currdirect,  
                           headers, recbase, p_lines, last_line, bottom_line);

        }
        num = locmem->crs_ln - locmem->top_ln;
        if (headers[num].owner[0] != '-')
               mode = i_read_key(rcmdlist, locmem, ch, currbid, 
                         bottom_line);
        }
    }
    } while (mode != DOQUIT);
#undef  FHSZ

return_i_read:
    free(headers);
    last_line = last_line0;
    hit_thread = hit_thread0;
    headers = headers0;
    strlcpy(currdirect, currdirect0, sizeof(currdirect));
    return;
}