Add support for tab-completion when selecting by rule

[alpine.git] / pith / flag.c

/*
 * ========================================================================
 * Copyright 2013-2022 Eduardo Chappa
 * Copyright 2006-2007 University of Washington
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * ========================================================================
 */

/*======================================================================
     flag.c
     Implements Pine message flag management routines
  ====*/


#include "../pith/headers.h"
#include "../pith/flag.h"
#include "../pith/pineelt.h"
#include "../pith/icache.h"
#include "../pith/mailindx.h"
#include "../pith/mailcmd.h"
#include "../pith/msgno.h"
#include "../pith/thread.h"
#include "../pith/sort.h"
#include "../pith/news.h"
#include "../pith/sequence.h"


/*
 * Internal prototypes
 */
void    flag_search(MAILSTREAM *, int, MsgNo, MSGNO_S *, long (*)(MAILSTREAM *));
long    flag_search_sequence(MAILSTREAM *, MSGNO_S *, long, int);



/*----------------------------------------------------------------------
  Return sequence number based on given index that are search-worthy

    Args: stream --
          msgmap --
          msgno --
          flags -- flags for msgline_hidden

  Result:  0                 : index not search-worthy
          -1                 : index out of bounds
           1 - stream->nmsgs : sequence number to flag search

  ----*/
long
flag_search_sequence(MAILSTREAM *stream, MSGNO_S *msgmap, long int msgno, int flags)
{
    long rawno = msgno;

    return((msgno > stream->nmsgs
            || msgno <= 0
            || (msgmap && !(rawno = mn_m2raw(msgmap, msgno))))
              ? -1L             /* out of range! */
              : ((get_lflag(stream, NULL, rawno, MN_EXLD)
                  || (msgmap && msgline_hidden(stream, msgmap, msgno, flags)))
                    ? 0L                /* NOT interesting! */
                    : rawno));
}



/*----------------------------------------------------------------------
  Perform mail_search based on flag bits

    Args: stream --
          flags --
          start --
          msgmap --

  Result: if no set_* specified, call mail_search to light the searched
          bit for all the messages matching the given flags.  If set_start
          specified, it is an index (possibly into set_msgmap) telling
          us where to search for invalid flag state hence when we
          return everything with the searched bit is interesting and
          everything with the valid bit lit is believably valid.

  ----*/
void
flag_search(MAILSTREAM *stream, int flags, MsgNo set_start, MSGNO_S *set_msgmap,
            long int (*ping)(MAILSTREAM *))
{
    long                n, i, new;
    char               *seq;
    SEARCHPGM          *pgm;
    SEARCHSET          *full_set = NULL, **set;
    MESSAGECACHE       *mc;
    extern  MAILSTREAM *mm_search_stream;

    if(!stream)
      return;

    new = sp_new_mail_count(stream);

    /* Anything we don't already have flags for? */
    if(set_start){
        /*
         * Use elt's sequence bit to coalesce runs in ascending
         * sequence order...
         */
        for(i = 1L; i <= stream->nmsgs; i++)
          if((mc = mail_elt(stream, i)) != NULL)
            mc->sequence = 0;

        for(i = set_start;
            (n = flag_search_sequence(stream, set_msgmap, i, MH_ANYTHD)) >= 0L;
            (flags & F_SRCHBACK) ? i-- : i++)
          if(n > 0L && n <= stream->nmsgs
             && (mc = mail_elt(stream, n)) && !mc->valid)
            mc->sequence = 1;

        /* Unroll searchset in ascending sequence order */
        set = &full_set;
        for(i = 1L; i <= stream->nmsgs; i++)
          if((mc = mail_elt(stream, i)) && mc->sequence){
              if(*set){
                  if(((*set)->last ? (*set)->last : (*set)->first)+1L == i)
                    (*set)->last = i;
                  else
                    set = &(*set)->next;
              }

              if(!*set){
                  *set = mail_newsearchset();
                  (*set)->first = i;
              }
          }

        /*
         * No search-worthy messages?, prod the server for
         * any flag updates and clear the searched bits...
         */
        if(full_set){
            if(full_set->first == 1
               && full_set->last == stream->nmsgs
               && full_set->next == NULL)
              mail_free_searchset(&full_set);
        }
        else{
            for(i = 1L; i <= stream->nmsgs; i++)
              if((mc = mail_elt(stream, i)) != NULL)
                mc->searched = 0;

            if(ping)
              (*ping)(stream);  /* prod server for any flag updates */

            if(!(flags & F_NOFILT) && new != sp_new_mail_count(stream)){
                process_filter_patterns(stream, sp_msgmap(stream),
                                        sp_new_mail_count(stream));

                refresh_sort(stream, sp_msgmap(stream), SRT_NON);
                flag_search(stream, flags, set_start, set_msgmap, ping);
            }

            return;
        }
    }

    if((!is_imap_stream(stream) || modern_imap_stream(stream))
       && !(IS_NEWS(stream))){
        pgm = mail_newsearchpgm();

        if(flags & F_SEEN)
          pgm->seen = 1;

        if(flags & F_UNSEEN)
          pgm->unseen = 1;

        if(flags & F_DEL)
          pgm->deleted = 1;

        if(flags & F_UNDEL)
          pgm->undeleted = 1;

        if(flags & F_ANS)
          pgm->answered = 1;

        if(flags & F_UNANS)
          pgm->unanswered = 1;

        if(flags & F_FLAG)
          pgm->flagged = 1;

        if(flags & F_UNFLAG)
          pgm->unflagged = 1;

        if(flags & (F_FWD | F_UNFWD)){
            STRINGLIST **slpp;

            for(slpp = (flags & F_FWD) ? &pgm->keyword : &pgm->unkeyword;
                *slpp;
                slpp = &(*slpp)->next)
              ;

            *slpp = mail_newstringlist();
            (*slpp)->text.data = (unsigned char *) cpystr(FORWARDED_FLAG);
            (*slpp)->text.size = (unsigned long) strlen(FORWARDED_FLAG);
        }

        if(flags & F_RECENT)
          pgm->recent = 1;

        if(flags & F_OR_SEEN){
            SEARCHPGM *pgm2 = mail_newsearchpgm();
            pgm2->or = mail_newsearchor();
            pgm2->or->first = pgm;
            pgm2->or->second = mail_newsearchpgm();
            pgm2->or->second->seen = 1;
            pgm = pgm2;
        }

        if(flags & F_OR_UNSEEN){
            SEARCHPGM *pgm2 = mail_newsearchpgm();
            pgm2->or = mail_newsearchor();
            pgm2->or->first = pgm;
            pgm2->or->second = mail_newsearchpgm();
            pgm2->or->second->unseen = 1;
            pgm = pgm2;
        }

        if(flags & F_OR_DEL){
            SEARCHPGM *pgm2 = mail_newsearchpgm();
            pgm2->or = mail_newsearchor();
            pgm2->or->first = pgm;
            pgm2->or->second = mail_newsearchpgm();
            pgm2->or->second->deleted = 1;
            pgm = pgm2;
        }

        if(flags & F_OR_UNDEL){
            SEARCHPGM *pgm2 = mail_newsearchpgm();
            pgm2->or = mail_newsearchor();
            pgm2->or->first = pgm;
            pgm2->or->second = mail_newsearchpgm();
            pgm2->or->second->undeleted = 1;
            pgm = pgm2;
        }

        if(flags & F_OR_FLAG){
            SEARCHPGM *pgm2 = mail_newsearchpgm();
            pgm2->or = mail_newsearchor();
            pgm2->or->first = pgm;
            pgm2->or->second = mail_newsearchpgm();
            pgm2->or->second->flagged = 1;
            pgm = pgm2;
        }

        if(flags & F_OR_UNFLAG){
            SEARCHPGM *pgm2 = mail_newsearchpgm();
            pgm2->or = mail_newsearchor();
            pgm2->or->first = pgm;
            pgm2->or->second = mail_newsearchpgm();
            pgm2->or->second->unflagged = 1;
            pgm = pgm2;
        }

        if(flags & F_OR_ANS){
            SEARCHPGM *pgm2 = mail_newsearchpgm();
            pgm2->or = mail_newsearchor();
            pgm2->or->first = pgm;
            pgm2->or->second = mail_newsearchpgm();
            pgm2->or->second->answered = 1;
            pgm = pgm2;
        }

        if(flags & F_OR_UNANS){
            SEARCHPGM *pgm2 = mail_newsearchpgm();
            pgm2->or = mail_newsearchor();
            pgm2->or->first = pgm;
            pgm2->or->second = mail_newsearchpgm();
            pgm2->or->second->unanswered = 1;
            pgm = pgm2;
        }

        if(flags & (F_OR_FWD | F_OR_UNFWD)){
            STRINGLIST **slpp;
            SEARCHPGM *pgm2 = mail_newsearchpgm();
            pgm2->or = mail_newsearchor();
            pgm2->or->first = pgm;
            pgm2->or->second = mail_newsearchpgm();

            for(slpp = (flags & F_OR_FWD)
                         ? &pgm2->or->second->keyword
                         : &pgm2->or->second->unkeyword;
                *slpp;
                slpp = &(*slpp)->next)
              ;

            *slpp = mail_newstringlist();
            (*slpp)->text.data = (unsigned char *) cpystr(FORWARDED_FLAG);
            (*slpp)->text.size = (unsigned long) strlen(FORWARDED_FLAG);

            pgm = pgm2;
        }

        if(flags & F_OR_RECENT){
            SEARCHPGM *pgm2 = mail_newsearchpgm();
            pgm2->or = mail_newsearchor();
            pgm2->or->first = pgm;
            pgm2->or->second = mail_newsearchpgm();
            pgm2->or->second->recent = 1;
            pgm = pgm2;
        }

        pgm->msgno = full_set;

        pine_mail_search_full(mm_search_stream = stream, NULL,
                              pgm, SE_NOPREFETCH | SE_FREE);

        if(!(flags & F_NOFILT) && new != sp_new_mail_count(stream)){
            process_filter_patterns(stream, sp_msgmap(stream),
                                    sp_new_mail_count(stream));

            flag_search(stream, flags, set_start, set_msgmap, ping);
        }
    }
    else{
        if(full_set){
            /* sequence bits of interesting msgs set */
            mail_free_searchset(&full_set);
        }
        else{
            /* light sequence bits of interesting msgs */
            for(i = 1L;
                (n = flag_search_sequence(stream, set_msgmap, i, MH_ANYTHD)) >= 0L;
                i++)
              if(n > 0L && n <= stream->nmsgs
                  && (mc = mail_elt(stream, n)) != NULL)
                   mc->sequence = !mc->valid ? 1 : 0;
        }

        for(i = 1L; i <= stream->nmsgs; i++)
          if((mc = mail_elt(stream, i)) != NULL)
            mc->searched = 0;

        if((seq = build_sequence(stream, NULL, NULL)) != NULL){
            pine_mail_fetch_flags(stream, seq, 0L);
            fs_give((void **) &seq);
        }
    }
}



/*----------------------------------------------------------------------
    count messages on stream with specified system flag attributes

  Args: stream -- The stream/folder to look at message status
        flags -- flags on folder/stream to examine

 Result: count of messages flagged as requested

 Task: return count of message flagged as requested while being
       as server/network friendly as possible.

 Strategy: run thru flags to make sure they're all valid.  If any
           invalid, do a search starting with the invalid message.
           If all valid, ping the server to let it know we're 
           receptive to flag updates.  At this 

  ----------------------------------------------------------------------*/
long
count_flagged(MAILSTREAM *stream, long int flags)
{
    long                n, count;
    MESSAGECACHE       *mc;

    if(!stream)
      return(0L);

    flag_search(stream, flags, 1, NULL, pine_mail_ping);

    /* Paw thru once more since all should be updated */
    for(n = 1L, count = 0L; n <= stream->nmsgs; n++)
      if((((mc = mail_elt(stream, n)) && mc->searched)
          || (mc && mc->valid && FLAG_MATCH(flags, mc, stream)))
         && !get_lflag(stream, NULL, n, MN_EXLD)){        
          mc->searched = 1;     /* caller may be interested! */
          count++;
      }

    return(count);
}



/*----------------------------------------------------------------------
     Find the first message with the specified flags set

  Args: flags -- Flags in messagecache to match on
        stream -- The stream/folder to look at message status

 Result: Message number of first message with specified flags set or the
         number of the last message if none found.
  ----------------------------------------------------------------------*/
MsgNo
first_sorted_flagged(long unsigned int flags, MAILSTREAM *stream, long int set_start, int opts)
{
    MsgNo         i, n, start_with, winner = 0L;
    MESSAGECACHE *mc;
    int           last;
    MSGNO_S      *msgmap;

    msgmap = sp_msgmap(stream);

    last = (opts & FSF_LAST);

    /* set_start only affects which search bits we light */
    start_with = set_start ? set_start
                           : (flags & F_SRCHBACK)
                               ? mn_get_total(msgmap) : 1L;
    flag_search(stream, flags, start_with, msgmap, NULL);

    for(i = start_with;
        (n = flag_search_sequence(stream, msgmap, i,
                                 (opts & FSF_SKIP_CHID) ? 0 : MH_ANYTHD)) >= 0L;
        (flags & F_SRCHBACK) ? i-- : i++)
      if(n > 0L && n <= stream->nmsgs
         && (((mc = mail_elt(stream, n)) && mc->searched)
             || (mc && mc->valid && FLAG_MATCH(flags, mc, stream)))){
          winner = i;
          if(!last)
            break;
      }

    if(winner == 0L && flags != F_UNDEL && flags != F_NONE){
        dprint((4,
           "First_sorted_flagged didn't find a winner, look for undeleted\n"));
        winner = first_sorted_flagged(F_UNDEL, stream, 0L,
                opts | (mn_get_revsort(msgmap) ? 0 : FSF_LAST));
    }

    if(winner == 0L && flags != F_NONE){
        dprint((4,
          "First_sorted_flagged didn't find an undeleted, look for visible\n"));
        winner = first_sorted_flagged(F_NONE, stream, 0L,
                opts | (mn_get_revsort(msgmap) ? 0 : FSF_LAST));
    }

    dprint((4,
               "First_sorted_flagged returning winner = %ld\n", winner));
    return(winner ? winner
                  : (mn_get_revsort(msgmap)
                      ? 1L : mn_get_total(msgmap)));
}



/*----------------------------------------------------------------------
     Find the next message with specified flags set

  Args: flags  -- Flags in messagecache to match on
        stream -- The stream/folder to look at message status
        start  -- Start looking after this message
        opts   -- These bits are both input and output. On input the bit
                  NSF_TRUST_FLAGS tells us whether we need to ping or not.
                  On input, the bit NSF_SEARCH_BACK tells us that we want to
                  know about matches <= start if we don't find any > start.
                  On output, NSF_FLAG_MATCH is set if we matched a message.
  Returns: Message number of the matched message, if any; else the start # or
           the max_msgno if the mailbox changed dramatically.
  ----------------------------------------------------------------------*/
MsgNo
next_sorted_flagged(long unsigned int flags, MAILSTREAM *stream, long int start, int *opts)
{
    MsgNo         i, n, dir;
    MESSAGECACHE *mc;
    int           rev, fss_flags = 0;
    MSGNO_S      *msgmap;

    msgmap = sp_msgmap(stream);

    /*
     * Search for the next thing the caller's interested in...
     */

    fss_flags = (opts && *opts & NSF_SKIP_CHID) ? 0 : MH_ANYTHD;
    rev = (opts && *opts & NSF_SEARCH_BACK);
    dir = (rev ? -1L : 1L);

    flag_search(stream, flags | (rev ? F_SRCHBACK : 0), start + dir,
                msgmap,
                (opts && ((*opts) & NSF_TRUST_FLAGS)) ? NULL : pine_mail_ping);

    for(i = start + dir;
        (n = flag_search_sequence(stream, msgmap,
                                  i, fss_flags)) >= 0L;
        i += dir)
      if(n > 0L && n <= stream->nmsgs
         && (((mc = mail_elt(stream, n)) && mc->searched)
             || (mc && mc->valid && FLAG_MATCH(flags, mc, stream)))){
          /* actually found a msg matching the flags */
          if(opts)
            (*opts) |= NSF_FLAG_MATCH;

          return(i);
      }
    

    return(MIN(start, mn_get_total(msgmap)));
}



/*----------------------------------------------------------------------
  get the requested LOCAL flag bits for the given pine message number

   Accepts: msgs - pointer to message manipulation struct
            n - message number to get
            f - bitmap of interesting flags
   Returns: non-zero if flag set, 0 if not set or no elt (error?)

   NOTE: this can be used to test system flags
  ----*/
int
get_lflag(MAILSTREAM *stream, MSGNO_S *msgs, long int n, int f)
{
    MESSAGECACHE *mc;
    PINELT_S     *pelt;
    unsigned long rawno;

    rawno = msgs ? mn_m2raw(msgs, n) : n;
    if(!stream || rawno < 1L || rawno > stream->nmsgs)
      return(0);

    mc = mail_elt(stream, rawno);
    if(!mc || (pelt = (PINELT_S *) mc->sparep) == NULL)
      return(f ? 0 : 1);

    return((!f)
             ? !(pelt->hidden || pelt->excluded || pelt->selected ||
                 pelt->colhid || pelt->collapsed || pelt->searched)
             : (((f & MN_HIDE) ? pelt->hidden : 0)
                || ((f & MN_EXLD) ? pelt->excluded : 0)
                || ((f & MN_SLCT) ? pelt->selected : 0)
                || ((f & MN_STMP) ? pelt->tmp : 0)
                || ((f & MN_USOR) ? pelt->unsorted : 0)
                || ((f & MN_COLL) ? pelt->collapsed : 0)
                || ((f & MN_CHID) ? pelt->colhid : 0)
                || ((f & MN_CHID2) ? pelt->colhid2 : 0)
                || ((f & MN_SRCH) ? pelt->searched : 0)));
}



/*----------------------------------------------------------------------
  set the requested LOCAL flag bits for the given pine message number

   Accepts: msgs - pointer to message manipulation struct
            n - message number to set
            f - bitmap of interesting flags
            v - value (on or off) flag should get
   Returns: our index number of first

   NOTE: this isn't to be used for setting IMAP system flags
  ----*/
int
set_lflag(MAILSTREAM *stream, MSGNO_S *msgs, long int n, int f, int v)
{
    MESSAGECACHE *mc;
    long          rawno = 0L;
    PINETHRD_S   *thrd, *topthrd = NULL;
    PINELT_S    **peltp, *pelt;

    if(n < 1L || n > mn_get_total(msgs))
      return(0L);

    if((rawno=mn_m2raw(msgs, n)) > 0L && stream && rawno <= stream->nmsgs
       && (mc = mail_elt(stream, rawno))){
        int was_invisible, is_invisible;
        int chk_thrd_cnt = 0, thrd_was_visible = 0, was_hidden = 0, is_hidden;

        if(*(peltp = (PINELT_S **) &mc->sparep) == NULL){
            *peltp = (PINELT_S *) fs_get(sizeof(PINELT_S));
            memset(*peltp, 0, sizeof(PINELT_S));
        }

        pelt = (*peltp);

        was_invisible = (pelt->hidden || pelt->colhid) ? 1 : 0;

        if((chk_thrd_cnt = ((msgs->visible_threads >= 0L)
           && THRD_INDX_ENABLED() && (f & MN_HIDE) && (pelt->hidden != v))) != 0){
            thrd = fetch_thread(stream, rawno);
            if(thrd && thrd->top){
                if(thrd->top == thrd->rawno)
                  topthrd = thrd;
                else
                  topthrd = fetch_thread(stream, thrd->top);
            }

            if(topthrd){
                thrd_was_visible = thread_has_some_visible(stream, topthrd);
                was_hidden = pelt->hidden ? 1 : 0;
            }
        }

        if((f & MN_HIDE) && pelt->hidden != v){
            pelt->hidden = v;
            msgs->flagged_hid += (v) ? 1L : -1L;

            if(pelt->hidden && THREADING() && !THRD_INDX()
               && stream == ps_global->mail_stream
               && ps_global->thread_disp_style == THREAD_MUTTLIKE)
              clear_index_cache_for_thread(stream, fetch_thread(stream, rawno),
                                           sp_msgmap(stream));
        }

        if((f & MN_CHID) && pelt->colhid != v){
            pelt->colhid = v;
            msgs->flagged_chid += (v) ? 1L : -1L;
        }

        if((f & MN_CHID2) && pelt->colhid2 != v){
            pelt->colhid2 = v;
            msgs->flagged_chid2 += (v) ? 1L : -1L;
        }

        if((f & MN_COLL) && pelt->collapsed != v){
            pelt->collapsed = v;
            msgs->flagged_coll += (v) ? 1L : -1L;
        }

        if((f & MN_USOR) && pelt->unsorted != v){
            pelt->unsorted = v;
            msgs->flagged_usor += (v) ? 1L : -1L;
        }

        if((f & MN_EXLD) && pelt->excluded != v){
            pelt->excluded = v;
            msgs->flagged_exld += (v) ? 1L : -1L;
        }

        if((f & MN_SLCT) && pelt->selected != v){
            pelt->selected = v;
            msgs->flagged_tmp += (v) ? 1L : -1L;
        }

        if((f & MN_SRCH) && pelt->searched != v){
            pelt->searched = v;
            msgs->flagged_srch += (v) ? 1L : -1L;
        }

        if((f & MN_STMP) && pelt->tmp != v){
            pelt->tmp = v;
            msgs->flagged_stmp += (v) ? 1L : -1L;
        }

        is_invisible = (pelt->hidden || pelt->colhid) ? 1 : 0;

        if(was_invisible != is_invisible)
          msgs->flagged_invisible += (v) ? 1L : -1L;
        
        /*
         * visible_threads keeps track of how many of the max_thrdno threads
         * are visible and how many are MN_HIDE-hidden.
         */
        if(chk_thrd_cnt && topthrd
           && (was_hidden != (is_hidden = pelt->hidden ? 1 : 0))){
            if(!thrd_was_visible && !is_hidden){
                /* it is visible now, increase count by one */
                msgs->visible_threads++;
            }
            else if(thrd_was_visible && is_hidden){
                /* thread may have been hidden, check */
                if(!thread_has_some_visible(stream, topthrd))
                  msgs->visible_threads--;
            }
            /* else no change */
        }
    }

    return(1);
}


/*
 * Copy value of flag from to flag to.
 */
void
copy_lflags(MAILSTREAM *stream, MSGNO_S *msgmap, int from, int to)
{
    unsigned long i;
    int           hide;

    hide = ((to == MN_SLCT) && (any_lflagged(msgmap, MN_HIDE) > 0L));

    set_lflags(stream, msgmap, to, 0);

    if(any_lflagged(msgmap, from)){
      for(i = 1L; i <= mn_get_total(msgmap); i++)
        if(get_lflag(stream, msgmap, i, from))
          set_lflag(stream, msgmap, i, to, 1);
        else if(hide)
          set_lflag(stream, msgmap, i, MN_HIDE, 1);
    }
}


/*
 * Set flag f to value v in all message.
 */
void
set_lflags(MAILSTREAM *stream, MSGNO_S *msgmap, int f, int v)
{
    unsigned long i;

    if((v == 0 && any_lflagged(msgmap, f)) || v )
      for(i = 1L; i <= mn_get_total(msgmap); i++)
        set_lflag(stream, msgmap, i, f, v);
}



/*----------------------------------------------------------------------
  return whether the given flag is set somewhere in the folder

   Accepts: msgs - pointer to message manipulation struct
            f - flag bitmap to act on
   Returns: number of messages with the given flag set.
            NOTE: the sum, if multiple flags tested, is bogus
  ----*/
long
any_lflagged(MSGNO_S *msgs, int f)
{
    if(!msgs)
      return(0L);

    if(f == MN_NONE)
      return(!(msgs->flagged_hid || msgs->flagged_exld || msgs->flagged_tmp ||
               msgs->flagged_coll || msgs->flagged_chid || msgs->flagged_srch));
    else if(f == (MN_HIDE | MN_CHID))
      return(msgs->flagged_invisible);          /* special non-bogus case */
    else
      return(((f & MN_HIDE)   ? msgs->flagged_hid  : 0L)
             + ((f & MN_EXLD) ? msgs->flagged_exld : 0L)
             + ((f & MN_SLCT) ? msgs->flagged_tmp  : 0L)
             + ((f & MN_SRCH) ? msgs->flagged_srch  : 0L)
             + ((f & MN_STMP) ? msgs->flagged_stmp  : 0L)
             + ((f & MN_COLL) ? msgs->flagged_coll  : 0L)
             + ((f & MN_USOR) ? msgs->flagged_usor  : 0L)
             + ((f & MN_CHID) ? msgs->flagged_chid : 0L)
             + ((f & MN_CHID2) ? msgs->flagged_chid2 : 0L));
}