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

#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 (getans(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 isshow)
{
    int  top=locmem->top_ln;
    if (!last_line){
    cursor_show(3 , 0);
    return DONOTHING;
    }
    if (val > last_line){
        bell();
    val = last_line;
    }
    if (val <= 0){
        bell();
    val = 1;
    }
    if (val >= top && val < top + p_lines) {
        if(isshow){
        cursor_clear(3 + locmem->crs_ln - top, 0);
        cursor_show(3 + val - top, 0);
    }
    locmem->crs_ln = val;
    return DONOTHING;
    }
    locmem->top_ln = val - from_top;
    if (locmem->top_ln <= 0)
    locmem->top_ln = 1;
    locmem->crs_ln = val;
    return isshow ? PARTUPDATE : HEADERS_RELOAD;
}

static int
thread(keeploc_t * locmem, int stypen)
{
    fileheader_t fh;
    int     pos = locmem->crs_ln, jump = 200, new_ln;
    int     fd = -1, step = stypen & RS_FORWARD ? 1 : -1;
    char    *key = 
    (stypen & RS_AUTHOR ? headers[pos - locmem->top_ln].owner :
     (subject( stypen & RS_CURRENT ?
           currtitle :
           headers[pos - locmem->top_ln].title )));

    for(new_ln = pos + step ;
    new_ln > 0 && new_ln <= last_line && --jump>0;
    new_ln += step) {
    get_record_keep(currdirect, &fh, sizeof(fileheader_t), new_ln, &fd);
        if(stypen & RS_TITLE){
            if(stypen & RS_FIRST) {
        if(!strcmp(fh.title, key)) break;
        }
            else
        if(!strcmp(subject(fh.title), key)) break;
    }
        else if(stypen & RS_NEWPOST){
            if(strncmp(fh.title,"Re:",3)) break;
    }
        else{  // RS_AUTHOR
            if(!strcmp(subject(fh.owner), key)) break;
    }
    }
    if( fd != -1 )
    close(fd);
    if( jump <=0 || new_ln<=0 || new_ln > last_line )
    new_ln = pos; //didn't find
    else{
    strncpy(currtitle, fh.title, TTLEN);
    strncpy(currtitle, fh.title, TTLEN);
    }
    return new_ln;
}


#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:
    vmsg(msg_fwd_ok);
    break;
    case -1:
    vmsg(msg_fwd_err1);
    break;
    case -2:
    vmsg(msg_fwd_err2);
    break;
    default:
    break;
    }
}
#endif

static int
select_read(keeploc_t * locmem, int sr_mode)
{
#define READSIZE 64  // 8192 / sizeof(fileheader_t)
   fileheader_t    fhs[READSIZE];
   char newdirect[MAXPATHLEN];
   char keyword[TTLEN + 1] = "";
   char   genbuf[MAXPATHLEN], *p;
   int    len, fd, fr, i, count=0, reference = 0;

   fileheader_t *fh = &headers[locmem->crs_ln - locmem->top_ln]; 
   if(sr_mode & RS_AUTHOR){
       if(!getdata_str(b_lines, 0,
               currmode & MODE_SELECT ? "增加條件 作者:":"搜尋作者:",
               keyword, IDLEN+1, LCECHO, fh->owner))
       return READ_REDRAW; 
   }
   else if(sr_mode  & RS_KEYWORD){
       if(!getdata_str(b_lines, 0, 
               currmode & MODE_SELECT ? "增加條件 標題:":"搜尋標題:",
               keyword, TTLEN, DOECHO, subject(fh->title)))
       return READ_REDRAW;
   }
   else if(sr_mode & RS_TITLE)
       strcpy(keyword, subject(fh->title));           

   p = strstr(currdirect, "SR");
   
   snprintf(genbuf, sizeof(genbuf), "%s.%X.%X",
            p ? p : "SR",
            sr_mode, StringHash(keyword));
   if( strlen(genbuf) > MAXPATHLEN - 50 )
       return  READ_REDRAW; // avoid overflow

   if (currstat == RMAIL)
       sethomefile(newdirect, cuser.userid, genbuf);
   else
       setbfile(newdirect, currboard, genbuf);

   if( !(now - dasht(newdirect) > 600) )
       count = dashs(newdirect);
   else {
       if( (fd = open(newdirect, O_CREAT | O_RDWR, 0600)) == -1 )
       return READ_REDRAW;
       if( (fr = open(currdirect, O_RDONLY, 0)) != -1 ) {
       while( (len = read(fr, fhs, sizeof(fhs))) > 0 ){
           len /= sizeof(fileheader_t);
           for( i = 0 ; i < len ; ++i ){
           reference++;
           if( sr_mode & RS_MARK &&
               !(fhs[i].filemode & FILE_MARKED) )
               continue;
           if(sr_mode & RS_NEWPOST &&
              !strncmp(fhs[i].title,  "Re:", 3))
               continue;
           if(sr_mode & RS_AUTHOR &&
              !strcasestr(fhs[i].owner, keyword))
               continue;
           if(sr_mode & RS_KEYWORD &&
              !strcasestr(fhs[i].title, keyword))
               continue;
           if(sr_mode & RS_TITLE &&          
              strcmp(subject(fhs[i].title), keyword))
               continue;
           ++count;
           fhs[i].money = reference | FHR_REFERENCE;
           write(fd, &fhs[i], sizeof(fileheader_t));
           }
       } // end while
           close(fr);
       }
       close(fd);
   }

   if(count) {
       strlcpy(currdirect, newdirect, sizeof(currdirect));
       currmode |= MODE_SELECT;
       return NEWDIRECT;
   }
   return READ_REDRAW;
}

static int
i_read_key(onekey_t * rcmdlist, keeploc_t * locmem, 
           int bid, int bottom_line)
{
    int     mode = DONOTHING, num, new_top=10;
    int     ch, new_ln = locmem->crs_ln, lastmode=0;
    char    direct[60];
    static  char default_ch = 0;
    
    do {
    if( (mode = cursor_pos(locmem, new_ln, new_top, default_ch ? 0 : 1))
        != DONOTHING )
        return mode;
    
    if( !default_ch )
        ch = igetch();
    else{
        if(new_ln != locmem->crs_ln) {// move fault
        default_ch=0;
        return FULLUPDATE;
        }
        ch = default_ch;
    }

    new_top = 10; // default 10 
    switch (ch) {
        case '0':    case '1':    case '2':    case '3':    case '4':
    case '5':    case '6':    case '7':    case '8':    case '9':
        if( (num = search_num(ch, last_line)) != -1 )
        new_ln = num + 1; 
        break;
        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;
        mode =  NEWDIRECT;
        }
        else
        mode =  (currmode & MODE_ETC) ? board_etc() :
            (currmode & MODE_DIGEST) ? board_digest() : DOQUIT;
        break;
        case Ctrl('L'):
        redoscr();
        break;

        case Ctrl('H'):
        mode = select_read(locmem, RS_NEWPOST);
        break;

        case 'a':
        case 'A':
        mode = select_read(locmem, RS_AUTHOR);
        break;

        case 'G':
        mode = select_read(locmem, RS_MARK);
        break;

        case '/':
        case '?':
        mode = select_read(locmem, RS_KEYWORD);
        break;

        case 'S':
        mode = select_read(locmem, RS_TITLE);
        break;

        case '=':
        new_ln = thread(locmem, RELATE_FIRST);
        break;

        case '\\':
        new_ln = thread(locmem, CURSOR_FIRST);
        break;

        case ']':
        new_ln = thread(locmem, RELATE_NEXT);
        break;

        case '+':
        new_ln = thread(locmem, CURSOR_NEXT);
        break;

        case '[':
        new_ln = thread(locmem, RELATE_PREV);
        break;

        case '-':
        new_ln = thread(locmem, CURSOR_PREV);
        break;

        case '<':
        case ',':
        new_ln = thread(locmem, NEWPOST_PREV);
        break;

        case '.':
        case '>':
        new_ln = thread(locmem, NEWPOST_NEXT);
        break;

        case 'p':
        case 'k':
    case KEY_UP:
        new_ln = locmem->crs_ln - 1; 
        new_top = p_lines - 2;
        break;

    case 'n':
    case 'j':
    case KEY_DOWN:
        new_ln = locmem->crs_ln + 1; 
        new_top = 1;
        break;

    case ' ':
    case KEY_PGDN:
    case 'N':
    case Ctrl('F'):
        new_ln = locmem->top_ln + p_lines; 
        new_top = 0;
        break;

    case KEY_PGUP:
    case Ctrl('B'):
    case 'P':
        new_ln = locmem->top_ln - p_lines; 
        new_top = 0;
        break;

    case KEY_END:
    case '$':
        new_ln = last_line;
        new_top = p_lines-1;
        break;

    case 'F':
    case 'U':
        if (HAS_PERM(PERM_FORWARD)) {
        mail_forward(&headers[locmem->crs_ln - locmem->top_ln],
                 currdirect, ch /* == 'U' */ );
        /* by CharlieL */
        mode = READ_REDRAW;
        }
        break;

    case Ctrl('Q'):
        mode = my_query(headers[locmem->crs_ln - locmem->top_ln].owner);
        break;

    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);
        }
        mode = 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))
        locmem->crs_ln = locmem->crs_ln + 1; 
        mode = PART_REDRAW;
        break;

    case Ctrl('C'):
    if (TagNum) {
        TagNum = 0;
        mode = FULLUPDATE;
    }
        break;

    case Ctrl('T'):
    mode = TagThread(currdirect);
        break;

    case Ctrl('D'):
    mode = TagPruner(bid);
        break;

    case '\n':
    case '\r':
    case 'l':
    case KEY_RIGHT:
    ch = 'r';
    default:
    if( ch == 'h' && currmode & (MODE_ETC | MODE_DIGEST) )
        break;
    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);
        if(mode == READ_SKIP)
                    mode = lastmode;

        // 以下這幾種 mode 要再處理游標
                if(mode == READ_PREV || mode == READ_NEXT || 
                   mode == RELATE_PREV || mode == RELATE_FIRST || 
                   mode == AUTHOR_NEXT || mode ==  AUTHOR_PREV ||
                   mode == RELATE_NEXT){
            lastmode = mode;

            switch(mode){
                    case READ_PREV:
                        new_ln =  locmem->crs_ln - 1;
                        break;
                    case READ_NEXT:
                        new_ln =  locmem->crs_ln + 1;
                        break;
                case RELATE_PREV:
                        new_ln = thread(locmem, RELATE_PREV);
            break;
                    case RELATE_NEXT:
                        new_ln = thread(locmem, RELATE_NEXT);
                break;
                    case RELATE_FIRST:
                        new_ln = thread(locmem, RELATE_FIRST);
                break;
                    case AUTHOR_PREV:
                        new_ln = thread(locmem, AUTHOR_PREV);
                break;
                    case AUTHOR_NEXT:
                        new_ln = thread(locmem, AUTHOR_NEXT);
                break;
            }
            mode = DONOTHING; default_ch = 'r';
                }
        else {
            default_ch = 0;
            lastmode = 0;
        }
        } //end if (func != NULL)
    } // ch > 0 && ch <= onekey_size 
        break;
    } // end switch
    } while (mode == DONOTHING);
    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( !last_line )
    return 0;
    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;
    int             num = 0, entries = 0, n_bottom=0;
    int             i;
    char            currdirect0[64];
    int             last_line0 = last_line;
    int             bottom_line = 0;
    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) {
        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 (recbase != locmem->top_ln) { //headers reload
        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);
            if( last_line == 0 )
                  outs("    沒有文章...");
            else
        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 HEADERS_RELOAD:
        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);
        }
            break;
    } //end switch
    mode = i_read_key(rcmdlist, locmem, currbid, bottom_line);
    } while (mode != DOQUIT);
#undef  FHSZ

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