* Update to packages/alpine.spec to account for the new location of man

[alpine.git] / pico / pico.c

#if     !defined(lint) && !defined(DOS)
static char rcsid[] = "$Id: pico.c 921 2008-01-31 02:09:25Z hubert@u.washington.edu $";
#endif

/*
 * ========================================================================
 * Copyright 2006-2008 University of Washington
 * Copyright 2013-2017 Eduardo Chappa
 *
 * 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
 *
 * ========================================================================
 */

/*
 * Program:     Main Pine Composer routines
 *
 *
 * WEEMACS/PICO NOTES:
 *
 * 01 Nov 89 - MicroEmacs 3.6 vastly pared down and becomes a function call 
 *             weemacs() and plugged into the Pine mailer.  Lots of unused
 *             MicroEmacs code laying around.
 *
 * 17 Jan 90 - weemacs() became weemacs() the composer.  Header editing
 *             functions added.
 *
 * 09 Sep 91 - weemacs() renamed pico() for the PIne COmposer.
 *
 */


/*
 * This program is in public domain; written by Dave G. Conroy.
 * This file contains the main driving routine, and some keyboard processing
 * code, for the MicroEMACS screen editor.
 *
 * REVISION HISTORY:
 *
 * 1.0  Steve Wilhite, 30-Nov-85
 *      - Removed the old LK201 and VT100 logic. Added code to support the
 *        DEC Rainbow keyboard (which is a LK201 layout) using the the Level
 *        1 Console In ROM INT. See "rainbow.h" for the function key defs
 *      Steve Wilhite, 1-Dec-85
 *      - massive cleanup on code in display.c and search.c
 *
 * 2.0  George Jones, 12-Dec-85
 *      - Ported to Amiga.
 *
 * 3.0  Daniel Lawrence, 29-Dec-85
 *      16-apr-86
 *      - updated documentation and froze development for 3.6 net release
 */

/* make global definitions not external */
#define maindef

#include        "../c-client/mail.h"
#include        "../c-client/utf8.h"

#ifdef _WINDOWS
/* wingdi.h uses ERROR (!) and we aren't using the c-client ERROR so... */
#undef ERROR

#endif
#include        "headers.h"
#include        "ebind.h"       /* default key bindings */
#include        "../pith/charconv/filesys.h"


void    remove_directions_mark(void);
void    func_init(void);
void    breplace(void *w);
int     any_header_changes(void);
int     cleanwhitespace(void);
int     isquotedspace(LINE *);


/*
 * function key mappings
 */
static UCS pfkm[12][2] = {
    { F1,  (CTRL|'G')},
    { F2,  (CTRL|'C')},
    { F3,  (CTRL|'X')},
    { F4,  (CTRL|'J')},
    { F5,  (CTRL|'R')},
    { F6,  (CTRL|'W')},
    { F7,  (CTRL|'Y')},
    { F8,  (CTRL|'V')},
    { F9,  (CTRL|'K')},
    { F10, (CTRL|'U')},
    { F11, (CTRL|'O')},
#ifdef  SPELLER
    { F12, (CTRL|'T')}
#else
    { F12, (CTRL|'D')}
#endif
};


void
remove_directions_mark(void)
{
   LINE *lp;
   int i;
   UCS c;

   for(lp = lforw(curbp->b_linep); lp != curbp->b_linep; lp = lforw(lp)){
      for(i = 0; i < llength(lp);){
         c = lgetc(lp, i).c;
         if(c == 0x200E || c == 0x200F){
            curwp->w_dotp = lp;
            curwp->w_doto = i;
            if(i < llength(lp))
               forwdel(FALSE, 1);
            else
              llength(lp)--;
            direction = c == 0x200E ? 0 : 1;
         }
         else
           lgetc(lp,i++).d = direction;
      }
   }
   curwp->w_linep   = lforw(curbp->b_linep);
   curwp->w_dotp    = lforw(curbp->b_linep);
   curwp->w_doto    = 0;
}


/*
 * flag for the various functions in pico() to set when ready
 * for pico() to return...
 */
int      pico_all_done = 0;
jmp_buf  finstate;
UCS     *pico_anchor = NULL;
extern struct headerentry *headents;

/*
 * pico - the main routine for Pine's composer.
 *
 */
int
pico(PICO *pm)
{
    UCS      c;
    register int    f;
    register int    n;
    char     bname[NBUFN];              /* buffer name of file to read */
    extern   struct on_display ods;
    int      checkpointcnt = 0, input = 0;
    int      ret;
    char     chkptfile[NLINE];
#ifdef  _WINDOWS
    int      cursor_shown;
#endif

    Pmaster       = pm;
    gmode         = MDWRAP;
    gmode        |= pm->pine_flags;     /* high 4 bits rsv'd for pine */

    alt_speller   = pm->alt_spell;
#ifdef _WINDOWS
    dictionary    = pm->dict;
    chosen_dict   = pm->chosen_dict;
#endif /* _WINDOWS */
    pico_all_done = 0;
    km_popped     = 0;

    if(!vtinit())                       /* Init Displays.      */
      return(COMP_CANCEL);

    strncpy(bname, "main", sizeof(bname));              /* default buffer name */
    bname[sizeof(bname)-1] = '\0';
    edinit(bname);                      /* Buffers, windows.   */

    if(InitMailHeader(pm))              /* init mail header structure */
      gmode &= ~(P_BODY | P_HEADEND);   /* flip off special header stuff */

    /* setup to process commands */
    lastflag = 0;                       /* Fake last flags.     */
    curbp->b_mode |= gmode;             /* and set default modes*/

    if(Pmaster->pine_anchor)
      pico_anchor = utf8_to_ucs4_cpystr(Pmaster->pine_anchor);
    else
      pico_anchor = NULL;

    if(Pmaster->quote_str)
      glo_quote_str = utf8_to_ucs4_cpystr(Pmaster->quote_str);
    else
      glo_quote_str = NULL;

    if(Pmaster->wordseps)
      glo_wordseps = ucs4_cpystr(Pmaster->wordseps);
    else
      glo_wordseps = NULL;

    bindtokey(DEL, (gmode & P_DELRUBS) ? forwdel : backdel);

    if(pm->msgtext)
      breplace(pm->msgtext);

    remove_directions_mark();

#ifdef  _WINDOWS
    cursor_shown = mswin_showcaret(1);  /* turn on for main window */
    mswin_allowpaste(MSWIN_PASTE_FULL);
    mswin_setscrollcallback (pico_scroll_callback);
#endif

    /* prepare for checkpointing */
    chkptfile[0] = '\0';
    chkptinit((*Pmaster->ckptdir)(chkptfile, sizeof(chkptfile)), sizeof(chkptfile));
    if(gmode & P_CHKPTNOW)
      writeout(chkptfile, TRUE);

    pico_all_done = setjmp(finstate);   /* jump out of HUP handler ? */

    if(gmode & MDALTNOW){
        while(!pico_all_done){
            if(((gmode & P_BODY) || !Pmaster->headents)
               && alt_editor(0, 1) < 0)
              break;                    /* if problem, drop into pico */

            if(Pmaster->headents){
                update();               /* paint screen, n' start editing... */
                HeaderEditor((gmode & (P_HEADEND | P_BODY)) ? 2 : 0, 0);
                gmode |= P_BODY;        /* make sure we enter alt ed next */
            }
            else
              pico_all_done = COMP_EXIT;
        }
    }
    else if(!pico_all_done){
        if(gmode & P_BODY){             /* begin editing the header? */
            ArrangeHeader();            /* line up pointers */
            /*
             * Move to the offset pine asked us to move to.
             * Perhaps we should be checking to see if this is
             * a reasonable number before moving.
             */
            if(Pmaster && Pmaster->edit_offset)
              forwchar(FALSE, Pmaster->edit_offset);
        }
        else{
            update();                   /* paint screen, */
            HeaderEditor((gmode & P_HEADEND) ? 2 : 0, 0);
        }
    }

    while(1){
        if(pico_all_done){
#ifdef  _WINDOWS
            if(!cursor_shown)
              mswin_showcaret(0);

            mswin_allowpaste(MSWIN_PASTE_DISABLE);
            mswin_setscrollcallback (NULL);
#endif
            ret = anycb() ? BUF_CHANGED : 0;
            switch(pico_all_done){      /* prepare for/handle final events */
              case COMP_EXIT :          /* already confirmed */
                packheader();
                if(Pmaster 
                   && (Pmaster->strip_ws_before_send
                       || Pmaster->allow_flowed_text))
                  cleanwhitespace();
                ret |= COMP_EXIT;
                break;

              case COMP_CANCEL :        /* also already confirmed */
                packheader();
                ret = COMP_CANCEL;
                break;

              case COMP_GOTHUP:
                /* 
                 * pack up and let caller know that we've received a SIGHUP
                 */
                if(ComposerEditing)             /* expand addr if needed */
                  call_builder(&headents[ods.cur_e], NULL, NULL);

                packheader();
                ret |= COMP_GOTHUP;
                break;

              case COMP_SUSPEND :
              default:                  /* safest if internal error */
                /*
                 * If we're in the headers mark the current header line
                 * with start_here bit so caller knows where to reset.
                 * Also set the edit_offset, which is either the offset
                 * into this header line or the offset into the body.
                 * Packheader will adjust edit_offset for multi-line
                 * headers.
                 */
                if(ComposerEditing){            /* in the headers */
                    headents[ods.cur_e].start_here = 1;
                    Pmaster->edit_offset = ods.p_ind;
                }
                else{
                    register LINE *clp;
                    register long  offset;

                    for(clp = lforw(curbp->b_linep), offset = 0L;
                        clp != curwp->w_dotp;
                        clp = lforw(clp))
                      offset += (llength(clp) + 1);

                    Pmaster->edit_offset = offset + curwp->w_doto;
                }

                packheader();
                ret |= COMP_SUSPEND;
                break;
            }

            if(pico_anchor)
              fs_give((void **) &pico_anchor);
            if(glo_quote_str)
              fs_give((void **) &glo_quote_str);
            if(glo_wordseps)
              fs_give((void **) &glo_wordseps);

            vttidy();                   /* clean up tty modes */
            zotdisplay();               /* blast display buffers */
            zotedit();
            our_unlink(chkptfile);
            Pmaster = NULL;             /* blat global */

            return(ret);
        }

        if(km_popped){
            km_popped--;
            if(km_popped == 0) /* cause bottom three lines to be repainted */
              curwp->w_flag |= WFHARD;
        }

        if(km_popped){  /* temporarily change to cause menu to be painted */
            term.t_mrow = 2;
            curwp->w_ntrows -= 2;
            curwp->w_flag |= WFMODE;
            movecursor(term.t_nrow-2, 0); /* clear status line, too */
            peeol();
        }

        update();                       /* Fix up the screen    */
        if(km_popped){
            term.t_mrow = 0;
            curwp->w_ntrows += 2;
        }

#ifdef  MOUSE
#ifdef  EX_MOUSE
        /* New mouse function for real mouse text seletion. */
        register_mfunc(mouse_in_pico, 2, 0, term.t_nrow - (term.t_mrow+1),
                       term.t_ncol);
#else
        mouse_in_content(KEY_MOUSE, -1, -1, -1, 0);
        register_mfunc(mouse_in_content, 2, 0, term.t_nrow - (term.t_mrow + 1),
                       term.t_ncol);
#endif
#endif
#ifdef  _WINDOWS
        mswin_setdndcallback (composer_file_drop);
        mswin_mousetrackcallback(pico_cursor);
#endif
        c = GetKey();
        if (term.t_nrow < 6 && c != NODATA){
            (*term.t_beep)();
            emlwrite(_("Please make the screen bigger."), NULL);
            continue;
        }

#ifdef  MOUSE
#ifdef  EX_MOUSE
        clear_mfunc(mouse_in_pico);
#else
        clear_mfunc(mouse_in_content);
#endif
#endif
#ifdef  _WINDOWS
        mswin_cleardndcallback ();
        mswin_mousetrackcallback(NULL);
#endif
        if(c == NODATA || time_to_check()){     /* new mail ? */
            if((*Pmaster->newmail)(c == NODATA ? 0 : 2, 1) >= 0){
                int rv;

                if(km_popped){
                    term.t_mrow = 2;
                    curwp->w_ntrows -= 2;
                    curwp->w_flag |= WFHARD;
                    km_popped = 0;
                }

                clearcursor();
                mlerase();
                rv = (*Pmaster->showmsg)(c);
                ttresize();
                picosigs();     /* restore altered handlers */
                if(rv)          /* Did showmsg corrupt the display? */
                  PaintBody(0); /* Yes, repaint */

                mpresf = 1;
                input = 0;
            }

            clearcursor();
            movecursor(0, 0);
        }

        if(km_popped)
          switch(c){
            case NODATA:
            case (CTRL|'L'):
              km_popped++;
              break;
            
            default:
              mlerase();
              break;
          }

        if(c == NODATA)         /* no op, getkey timed out */
          continue;
        else if(!input++)
          (*Pmaster->keybinput)();

        if (mpresf != FALSE) {          /* message stay around only  */
            if (mpresf++ > NMMESSDELAY) /* so long! */
              mlerase();
        }

        f = FALSE;                      /* vestigial */
        n = 1;
                                        /* Do it.               */
        execute(normalize_cmd(c, pfkm, 2), f, n);
        if(++checkpointcnt >= CHKPTDELAY){
            checkpointcnt = 0;
            writeout(chkptfile, TRUE);
        }
    }
}

/*
 * Initialize all of the buffers and windows. The buffer name is passed down
 * as an argument, because the main routine may have been told to read in a
 * file by default, and we want the buffer name to be right.
 */

/*
 * For the pine composer, we don't want to take over the whole screen
 * for editing.  the first some odd lines are to be used for message 
 * header information editing.
 */
void
edinit(char bname[])
{
    register BUFFER *bp;
    register WINDOW *wp;

    if(Pmaster)
      func_init();

    bp = bfind(bname, TRUE, BFWRAPOPEN);    /* First buffer         */
    wp = (WINDOW *) malloc(sizeof(WINDOW)); /* First window         */

    if (bp==NULL || wp==NULL){
        if(Pmaster)
          return;
        else
          exit(1);
    }

    curbp  = bp;                            /* Make this current    */
    wheadp = wp;
    curwp  = wp;
    wp->w_wndp  = NULL;                     /* Initialize window    */
    wp->w_bufp  = bp;
    bp->b_nwnd  = 1;                        /* Displayed.           */
    wp->w_linep = bp->b_linep;
    wp->w_dotp  = bp->b_linep;
    wp->w_doto  = 0;
    wp->w_markp = wp->w_imarkp = NULL;
    wp->w_marko = wp->w_imarko = 0;
    bp->b_linecnt = -1;

    if(Pmaster){
        term.t_mrow = Pmaster->menu_rows;
        wp->w_toprow = ComposerTopLine = COMPOSER_TOP_LINE;
        wp->w_ntrows = term.t_nrow - COMPOSER_TOP_LINE - term.t_mrow;
        fillcol = Pmaster->fillcolumn;
        strncpy(opertree,
               (Pmaster->oper_dir && strlen(Pmaster->oper_dir) < NLINE)
                 ? Pmaster->oper_dir : "", sizeof(opertree));
        opertree[sizeof(opertree)-1] = '\0';
        input_cs = Pmaster->input_cs;
    }
    else{
        if(sup_keyhelp)
          term.t_mrow = 0;
        else
          term.t_mrow = 2;

        wp->w_toprow = 2;
        wp->w_ntrows = term.t_nrow - 2 - term.t_mrow;
        if(userfillcol > 0)                     /* set fill column */
          fillcol = userfillcol;
        else
          fillcol = term.t_ncol - 6;
    }

    /*
     * MDSCUR mode implies MDTREE mode with a opertree of home directory,
     * unless opertree has been set differently.
     */
    if((gmode & MDSCUR) && !opertree[0]){
      strncpy(opertree, gethomedir(NULL), sizeof(opertree));
      opertree[sizeof(opertree)-1] = '\0';
    }

    if(*opertree)
      fixpath(opertree, sizeof(opertree));

    wp->w_force = 0;
    wp->w_flag  = WFMODE|WFHARD;            /* Full.                */
}


/*
 * This is the general command execution routine. It handles the fake binding
 * of all the keys to "self-insert". It also clears out the "thisflag" word,
 * and arranges to move it to the "lastflag", so that the next command can
 * look at it. Return the status of command.
 */
int
execute(UCS c, int f, int n)
{
    KEYTAB *ktp;
    int     status, ww;

    ktp = (Pmaster) ? &keytab[0] : &pkeytab[0];

    while (ktp->k_fp != NULL) {
        if (ktp->k_code == c) {

            if(lastflag&CFFILL){
                curwp->w_flag |= WFMODE;
                if(Pmaster == NULL)
                  sgarbk = TRUE;
            }

            thisflag = 0;
            status   = (*ktp->k_fp)(f, n);
            if((lastflag & CFFILL) && !(thisflag & CFFILL))
              fdelete();
            if((lastflag & CFFLBF) && !(thisflag & CFFLBF))
              kdelete();

            lastflag = thisflag;

            /*
             * Reset flag saying wrap should open a new line whenever
             * we execute a command (as opposed to just typing in text).
             * However, if that command leaves us in the same line on the
             * screen, then don't reset.
             */
            if(curwp->w_flag & (WFMOVE | WFHARD))
              curbp->b_flag |= BFWRAPOPEN;    /* wrap should open new line */

            return (status);
        }
        ++ktp;
    }

    if(lastflag & CFFILL)               /* blat unusable fill data */
      fdelete();
    if(lastflag & CFFLBF)
      kdelete();

    if (VALID_KEY(c)) {                 /* Self inserting.      */

        if (n <= 0) {                   /* Fenceposts.          */
            lastflag = 0;
            return (n<0 ? FALSE : TRUE);
        }
        thisflag = 0;                   /* For the future.      */

        /* do the appropriate insertion */
        /* pico never does C mode, this is simple */
        status = linsert(n, c);

        /*
         * Check to make sure we didn't go off of the screen
         * with that character.  Take into account tab expansion.
         * If so wrap the line...
         */
        if(curwp->w_bufp->b_mode & MDWRAP){
            int j, wid;

            wid = 0;
            for(j = 0; j < llength(curwp->w_dotp); j++)
              if(ucs4_isspace(lgetc(curwp->w_dotp, j).c)){
                  if(lgetc(curwp->w_dotp, j).c == TAB){
                    ++wid;
                    while(wid & 0x07)
                      ++wid;
                  }
                  else
                    ++wid;
              }
              else{
                  ww = wcellwidth((UCS) lgetc(curwp->w_dotp, j).c);
                  wid += (ww >= 0 ? ww : 1);
                  if(wid > fillcol){
                      wrapword();
                      break;
                  }
              }
        }

        lastflag = thisflag;
        return (status);
    }
    
    unknown_command(c);

    lastflag = 0;                           /* Fake last flags.     */
    return (FALSE);
}



/*
 * Fancy quit command, as implemented by Norm. If the any buffer has
 * changed do a write on that buffer and exit emacs, otherwise simply exit.
 */
int
quickexit(int f, int n)
{
    register BUFFER *bp;        /* scanning pointer to buffers */

    bp = bheadp;
    while (bp != NULL) {
        if ((bp->b_flag&BFCHG) != 0     /* Changed.             */
            && (bp->b_flag&BFTEMP) == 0) {      /* Real.                */
            curbp = bp;         /* make that buffer cur */
            filesave(f, n);
        }
        bp = bp->b_bufp;                        /* on to the next buffer */
    }
    return(wquit(f, n));                             /* conditionally quit   */
}



/* 
 * abort_composer - ask the question here, then go quit or 
 *                  return FALSE
 */
int
abort_composer(int f, int n)
{
    char *result;

    result = "";

    Pmaster->arm_winch_cleanup++;
    if(Pmaster->canceltest){
        if(((Pmaster->pine_flags & MDHDRONLY) && !any_header_changes())
          || (result = (*Pmaster->canceltest)(redraw_pico_for_callback))){
            pico_all_done = COMP_CANCEL;
            emlwrite(result, NULL);
            Pmaster->arm_winch_cleanup--;
            return(TRUE);
        }
        else{
            /* TRANSLATORS: The user typed the Cancel command and was
               asked to confirm that. Instead they canceled the cancel
               command. */
            emlwrite(_("Cancel Cancelled"), NULL);
            curwp->w_flag |= WFMODE;            /* and modeline so we  */
            sgarbk = TRUE;                      /* redraw the keymenu  */
            pclear(term.t_nrow-1, term.t_nrow);
            Pmaster->arm_winch_cleanup--;
            return(FALSE);
        }
    }
    else switch(mlyesno_utf8(Pmaster->headents
         ? _("Cancel message (answering \"Yes\" will abandon your mail message)")
         : (anycb() == FALSE)
             ? _("Cancel Edit (and abandon changes)")
             : _("Cancel Edit"),
         FALSE)){
      case TRUE:
        pico_all_done = COMP_CANCEL;
        return(TRUE);

      case ABORT:
        emlwrite(_("\007Cancel Cancelled"), NULL);
        break;

      default:
        mlerase();
    }
    return(FALSE);
}


/*
 * suspend_composer - return to pine with what's been edited so far
 */
int
suspend_composer(int f, int n)
{
    if(Pmaster && Pmaster->headents)
      pico_all_done = COMP_SUSPEND;
    else
      (*term.t_beep)();
    
    return(TRUE);
}



/*
 * Quit command. If an argument, always quit. Otherwise confirm if a buffer
 * has been changed and not written out. Normally bound to "C-X C-C".
 */
int
wquit(int f, int n)
{
    register int    s;

    if(Pmaster){
        char *result = NULL;
        int   ret;

        /* First, make sure there are no outstanding problems */ 
        if(AttachError()){
            emlwrite(_("\007Problem with attachments!  Fix errors or delete attachments."), NULL);
            return(FALSE);
        }

#ifdef  SPELLER
        if(Pmaster->always_spell_check)
          if(spell(0, 0) == -1)
            sleep(3);    /* problem, show error */
#endif
        /*
         * if we're not in header, show some of it as we verify sending...
         */
        display_for_send();
        packheader();
        Pmaster->arm_winch_cleanup++;
        if((!(Pmaster->pine_flags & MDHDRONLY) || any_header_changes())
           && (ret = (*Pmaster->exittest)(Pmaster->headents,
                                             redraw_pico_for_callback,
                                             Pmaster->allow_flowed_text,
                                             &result))){
            Pmaster->arm_winch_cleanup--;

            if(ret == -1){
                pico_all_done = COMP_CANCEL;
            }
            else{
                if(sgarbf)
                  update();

                lchange(WFHARD);                        /* set update flags... */
                curwp->w_flag |= WFMODE;                /* and modeline so we  */
                sgarbk = TRUE;                  /* redraw the keymenu  */
                pclear(term.t_nrow-2, term.t_nrow);
            }

            if(result && *result)
              emlwrite(result, NULL);
        }
        else{
            Pmaster->arm_winch_cleanup--;
            pico_all_done = COMP_EXIT;
            return(TRUE);
        }
    }
    else{
        if (f != FALSE                          /* Argument forces it.  */
        || anycb() == FALSE                     /* All buffers clean.   */
                                                /* User says it's OK.   */
        /* TRANSLATORS: buffer is the in-memory copy of a file */
        || (s=mlyesno_utf8(_("Save modified buffer (ANSWERING \"No\" WILL DESTROY CHANGES)"), -1)) == FALSE) {
                vttidy();
#if     defined(USE_TERMCAP) || defined(USE_TERMINFO) || defined(VMS)
                kbdestroy(kbesc);
#endif
                exit(0);
        }

        if(s == TRUE){
            if(filewrite(0,1) == TRUE)
              wquit(1, 0);
        }
        else if(s == ABORT){
            emlwrite(_("Exit cancelled"), NULL);
            if(term.t_mrow == 0)
              curwp->w_flag |= WFHARD;  /* cause bottom 3 lines to paint */
        }
        return(s);
    }

    return(FALSE);
}


/*
 * Has any editing been done to headers?
 */
int
any_header_changes(void)
{
    struct headerentry *he;

    for(he = Pmaster->headents; he->name != NULL; he++)
      if(he->dirty)
        break;
    
    return(he->name && he->dirty);
}

int
isquotedspace(LINE *line)
{
    int i, was_quote = 0;
    for(i = 0; i < llength(line); i++){
        if(lgetc(line, i).c == '>')
          was_quote = 1;
        else if(was_quote && lgetc(line, i).c == ' '){
            if(i+1 < llength(line) && ucs4_isspace(lgetc(line,i+1).c))
              return 1;
            else
              return 0;
        }
        else
          return 0;
    }
    return 0;
}

/*
 * This function serves two purposes, 1) to strip white space when
 * Pmaster asks that the composition have its trailing white space
 * stripped, or 2) to prepare the text as flowed text, as Pmaster
 * is telling us that we're working with flowed text.
 *
 * What flowed currently means to us is stripping all trailing white
 * space, except for one space if the following line is a continuation
 * of the paragraph.  Also, we space-stuff all lines beginning
 * with white-space, and leave siglines alone.
 */
int
cleanwhitespace(void)
{
    LINE *cursor_dotp = NULL, **lp = NULL;
    int i = 0, cursor_doto = 0, is_cursor_line = 0;
    int do_space_stuffing = 0;

    if(Pmaster && Pmaster->allow_flowed_text && !(*Pmaster->user_says_noflow)())
      do_space_stuffing++;

    cursor_dotp = curwp->w_dotp;
    cursor_doto = curwp->w_doto;
    gotobob(FALSE, 1);

    for(lp = &curwp->w_dotp; (*lp) != curbp->b_linep; (*lp) = lforw(*lp)){
        if(!(llength(*lp) == 3
             && lgetc(*lp, 0).c == '-'
             && lgetc(*lp, 1).c == '-'
             && lgetc(*lp, 2).c == ' ')
           && llength(*lp)){
            is_cursor_line = (cursor_dotp == (*lp));
            /* trim trailing whitespace, to be added back if flowing */
            for(i = llength(*lp); i; i--)
              if(!ucs4_isspace(lgetc(*lp, i - 1).c))
                break;
            if(i != llength(*lp)){
                int flow_line = 0;

                if(Pmaster && !Pmaster->strip_ws_before_send
                   && lforw(*lp) != curbp->b_linep
                   && llength(lforw(*lp))
                   && !(ucs4_isspace(lgetc(lforw(*lp), 0).c)
                        || isquotedspace(lforw(*lp)))
                   && !(llength(lforw(*lp)) == 3
                        && lgetc(lforw(*lp), 0).c == '-'
                        && lgetc(lforw(*lp), 1).c == '-'
                        && lgetc(lforw(*lp), 2).c == ' '))
                  flow_line = 1;
                if(flow_line && i && lgetc(*lp, i).c == ' '){
                    /* flowed line ending with space */
                    i++;
                    if(i != llength(*lp)){
                        curwp->w_doto = i;
                        ldelete(llength(*lp) - i, NULL);
                    }
                }
                else if(flow_line && i && ucs4_isspace(lgetc(*lp, i).c)){
                    /* flowed line ending with whitespace other than space*/
                    curwp->w_doto = i;
                    ldelete(llength(*lp) - i, NULL);
                    linsert(1, ' ');
                }
                else{
                    curwp->w_doto = i;
                    ldelete(llength(*lp) - i, NULL);
                }
            }
            if(do_space_stuffing && llength(*lp) && ucs4_isspace(lgetc(*lp, 0).c)){
                /* space-stuff only if flowed */
                if(Pmaster)
                  Pmaster->space_stuffed = 1;
                curwp->w_doto = 0;
                if(is_cursor_line && cursor_doto)
                  cursor_doto++;
                linsert(1, ' ');
            }
            if(is_cursor_line)
              cursor_dotp = (*lp);
        }
    }

    /* put the cursor back where we found it */
    gotobob(FALSE, 1);
    curwp->w_dotp = cursor_dotp;
    curwp->w_doto = (cursor_doto < llength(curwp->w_dotp))
      ? cursor_doto : llength(curwp->w_dotp) - 1;

    return(0);
}

/*
 * Remove all trailing white space from the text
 */
int
stripwhitespace(void)
{
    int i;
    LINE *cur_line = lforw(curbp->b_linep);

    do{
      /* we gotta test for the sigdash case here */
      if(!(cur_line->l_used == 3 && 
           lgetc(cur_line, 0).c == '-' &&
           lgetc(cur_line, 1).c == '-' &&
           lgetc(cur_line, 2).c == ' ')){
        for(i = cur_line->l_used - 1; i >= 0; i--)
          if(ucs4_isspace(lgetc(cur_line, i).c))
            cur_line->l_used--;
          else
            break;
      }
    }while((cur_line = lforw(cur_line)) != curbp->b_linep);
    return 0;
}

/*
 * Abort.
 * Beep the beeper. Kill off any keyboard macro, etc., that is in progress.
 * Sometimes called as a routine, to do general aborting of stuff.
 */
int
ctrlg(int f, int n)
{
    emlwrite(_("Cancelled"), NULL);
    return (ABORT);
}


/* tell the user that this command is illegal while we are in
 *  VIEW (read-only) mode
 */
int
rdonly(void)
{
    (*term.t_beep)();
    emlwrite("Key illegal in VIEW mode", NULL);
    return(FALSE);
}



/*
 * reset all globals to their initial values
 */
void
func_init(void)
{
    extern int    vtrow;
    extern int    vtcol;
    extern int    lbound;

    /*
     * re-initialize global buffer type variables ....
     */
    fillcol = (term.t_ncol > 80) ? 77 : term.t_ncol - 6;
    sgarbf = TRUE;
    mpresf = FALSE;
    mline_open = FALSE;
    ComposerEditing = FALSE;

    /*
     * re-initialize hardware display variables ....
     */
    vtrow = vtcol = lbound = 0;
    clearcursor();

    pat[0] = rpat[0] = '\0';
    browse_dir[0] = '\0';
}


/*
 * pico_help - help function for standalone composer
 * Oops - looks like utf8title is unused!
 *
 * This should be fixed to handle TAB characters.
 */
int
pico_help(char *utf8text[], char *utf8title, int i)
{
    register    int numline = 0;
    char        **p;
 
    p = utf8text;
    while(*p++ != NULL) 
      numline++;

    return(wscrollw(COMPOSER_TOP_LINE, term.t_nrow-1, utf8text, numline));
}



/*
 * zotedit() - kills the buffer and frees all lines associated with it!!!
 */
void
zotedit(void)
{
    wheadp->w_linep = wheadp->w_dotp = wheadp->w_markp = wheadp->w_imarkp = NULL;
    bheadp->b_linep = bheadp->b_dotp = bheadp->b_markp = NULL;

    free((char *) wheadp);                      /* clean up window */
    wheadp = NULL;
    curwp  = NULL;

    free((char *) bheadp);                      /* clean up buffers */
    bheadp = NULL;
    curbp  = NULL;

    zotheader();                                /* blast header lines */

    kdelete();                                  /* blast kill buffer */

}


#ifdef  MOUSE
/*
 * Generic mouse handling functions
 */
MENUITEM  menuitems[12];                /* key labels and functions */
MENUITEM *mfunc = NULL;                 /* list of regional functions  */
mousehandler_t  mtrack;                 /* mouse tracking handler */

/* last mouse position */
static  unsigned long levent = 0L;
static  int lrow = 0, lcol = 0, doubleclick, lbutton, lflags;
#ifdef  DOS
static  clock_t lastcalled = 0;
#else
static  time_t  lastcalled = 0;
#endif
static  mousehandler_t lastf;


/*
 * register_mfunc - register the given function to get called
 *                  on mouse events in the given display region
 */
int
register_mfunc(mousehandler_t f, int tlr, int tlc, int brr, int brc)
{
    MENUITEM **mp;

    if(!mouseexist())
      return(FALSE);

    for(mp = &mfunc; *mp; mp = &(*mp)->next)
      ;

    *mp = (MENUITEM *)malloc(sizeof(MENUITEM));
    memset(*mp, 0, sizeof(MENUITEM));

    (*mp)->action = f;
    (*mp)->tl.r   = tlr;
    (*mp)->br.r   = brr;
    (*mp)->tl.c   = tlc;
    (*mp)->br.c   = brc;
    (*mp)->lbl.c  = (*mp)->lbl.r = 0;
    (*mp)->label  = "";
    return(TRUE);
}


/*
 * clear_mfunc - clear any previously set mouse function
 */
void
clear_mfunc(mousehandler_t f)
{
    MENUITEM *mp, *tp;

    if((mp = mfunc) != NULL){
        if(mp->action == f)
          mfunc = mp->next;
        else
          for(tp = mp; tp->next; tp = tp->next)
            if(tp->next->action == f){
                mp = tp->next;
                tp->next = tp->next->next;
                break;
            }

        if(mp){
            mp->action = NULL;
            free(mp);
        }
    }
}



#ifdef EX_MOUSE

void
clear_mtrack(void)
{
    mtrack = NULL;
    mswin_allowmousetrack (FALSE);
}


void
register_mtrack(mousehandler_t f)
{
    if (f) {
        mtrack = f;
        mswin_allowmousetrack (TRUE);
    }
    else
        clear_mtrack ();
}


static void
move_dot_to(int row, int col)
{
    LINE *lp;
    int i;
    
    lp = curwp->w_linep;
    i = row - ((Pmaster) ? ComposerTopLine : 2);
    while(i-- && lp != curbp->b_linep)  /* count from top */
      lp = lforw(lp);
    curgoal = col;
    curwp->w_dotp = lp;                 /* to new dot. */
    curwp->w_doto = getgoal(lp);
    curwp->w_flag |= WFMOVE;
}


/*
 * mouse_in_pico
 *
 * When the mouse goes down in the body we set the mark and start 
 * tracking.
 *
 * As the mouse moves we update the dot and redraw the screen.
 *
 * If the mouse moves above or below the pico body region of the 
 * screen we scroll the text and update the dot position.
 *
 * When the mouse comes up we clean up.  If the mouse did not
 * move, then we clear the mark and turn off the selection.
 *
 * Most of the mouse processing is handled here.  The exception is
 * mouse down in the header.  Can't call HeaderEditor() from here so
 * we send up the KEY_MOUSE character, which gets dispatched to
 * mousepress(), which _can_ call HeaderEditor().
 */
unsigned long
mouse_in_pico(unsigned long mevent, int row, int col, int button, int flags)
{
    unsigned long       rv = 0;         /* Our return value. */
    int                 trow, tcol;     /* translated row and col. */

    static int lheader = FALSE;         /* Mouse down was in header. */

  
    /*
     * What's up.
     */
    switch (mevent) {
    case M_EVENT_DOWN:
      if(button != M_BUTTON_LEFT)
        break;

        /* Ignore mouse down if not in pico body region. */
        if (row < 2 || row > term.t_nrow - (term.t_mrow+1)) {
            clear_mtrack ();
            break;
        }
        
        /* Detect double clicks.  Not that we do anything with em, just
         * detect them. */
#ifdef  DOS
#ifdef  CLOCKS_PER_SEC
        doubleclick = (lrow == row && lcol == col
                       && clock() < (lastcalled + CLOCKS_PER_SEC/2));
#else
#ifdef  CLK_TCK
doubleclick = (lrow == row && lcol == col
                       && clock() < (lastcalled + CLK_TCK/2));
#else
        doubleclick = FALSE;
#endif
#endif
        lastcalled  = clock();
#else
        doubleclick = (lrow == row && lcol == col
                       && time(0) < (lastcalled + 2));
        lastcalled  = time(0);
#endif
        lheader     = FALSE;    /* Rember mouse down position. */
        levent      = mevent;
        lrow        = row;
        lcol        = col;
        lbutton     = button;
        lflags      = flags;
        
        /* Mouse down in body? */
        if (row < (Pmaster ? ComposerTopLine : 2)) {
            /* Mouse down in message header -> no tracking, just remember
             * where */
            lheader = TRUE;
        }
        else {
            /* Mouse down in message.
             * If no shift key and an existing mark -> clear the mark.
             * If shift key and no existing mark -> set mark before moving */
            if (!(flags & M_KEY_SHIFT) && curwp->w_markp) 
                setmark (0,1);          /* this clears the mark. */
            else if (flags & M_KEY_SHIFT && !curwp->w_markp)
                setmark (0,1);          /* while this sets the mark. */
            
            /* Reposition dot to mouse down. */
            move_dot_to (row, col);
            
            /* Set the mark to dot if no existing mark. */
            if (curwp->w_markp == NULL) 
                setmark (0,1);

            /* Track mouse movement. */
            register_mtrack (mouse_in_pico);
            update ();
            lheader = FALSE;            /* Just to be sure. */
        }
        break;
        
        
    case M_EVENT_TRACK:
        /* Mouse tracking. */
        if (lheader)                    /* Ignore mouse movement in header. */
            break;
    
        /* If above or below body, scroll body and adjust the row and col. */
        if (row < (Pmaster ? ComposerTopLine : 2)) {
            /* Scroll text down screen and move dot to top left corner. */
            scrollupline (0,1);
            trow = (Pmaster) ? ComposerTopLine : 2;
            tcol = 0;
        }
        else if (row > term.t_nrow - (term.t_mrow + 1)) {
            /* Scroll text up screen and move dot to bottom right corner. */
            scrolldownline (0,1);
            trow = term.t_nrow - (term.t_mrow + 1);
            tcol = term.t_ncol;
        }
        else {
            trow = row;
            tcol = col;
        }

        /* Move dot to target column. */
        move_dot_to (trow, tcol);
        
        /* Update screen. */
        update ();
        break;

        
    case M_EVENT_UP:
      if(button == M_BUTTON_RIGHT){
#ifdef  _WINDOWS
          pico_popup();
#endif
          break;
      }
      else if(button != M_BUTTON_LEFT)
        break;

        if (lheader) {
            lheader = FALSE;
            /* Last down in header. */
            if (row == lrow && col == lcol) {
                /* Mouse up and down in same place in header.  Means the
                 * user want to edit the header.  Return KEY_MOUSE which
                 * will cause mousepress to be called, which will
                 * call HeaderEditor.  Can't call HeaderEditor from here
                 * because that would mess up layering. */
                if (curwp->w_marko)
                    setmark (0,1);
                rv = (unsigned long) KEY_MOUSE;
            }
        }
        else {
            /* If up at same place, clear mark */
            if (curwp->w_markp == curwp->w_dotp && 
                    curwp->w_marko == curwp->w_doto) {
                setmark (0,1);
                curwp->w_flag |= WFMOVE;
            }
            clear_mtrack ();
            update ();
        }
        break;    
    }
    
    return(rv);
}
#endif



/*
 * mouse_in_content - general mechanism used to pass recognized mouse
 *                    events in predefined region back thru the usual
 *                    keyboard input stream.  The actual return value
 *                    passed back from this function is set dynamically
 *                    via the "down" argument which is read when both the
 *                    "row" and "col" arguments are negative.
 */
unsigned long
mouse_in_content(unsigned long mevent, int row, int col, int button, int flags)
{
    unsigned long   rv = 0;
    static unsigned long mouse_val = KEY_MOUSE;

    if(row == -1 && col == -1){
        mouse_val = mevent;                     /* setting return value */
    }
    else {
        /* A real event. */
        levent = mevent;
        switch (mevent) {
        case M_EVENT_DOWN:
            /* Mouse down does not mean anything, just keep track of 
             * where it went down and if this is a double click. */
#ifdef  DOS
#ifdef  CLOCKS_PER_SEC
            doubleclick = (lrow == row && lcol == col
                           && clock() < (lastcalled + CLOCKS_PER_SEC/2));
#else
#ifdef  CLK_TCK
            doubleclick = (lrow == row && lcol == col
                           && clock() < (lastcalled + CLK_TCK/2));
#else
            doubleclick = FALSE;
#endif
#endif
            lastcalled  = clock();
#else
            doubleclick = (lrow == row && lcol == col
                           && time(0) < (lastcalled + 2));
            lastcalled  = time(0);
#endif
            lrow        = row;
            lcol        = col;
            lbutton     = button;
            lflags      = flags;
            break;

        case M_EVENT_UP:
            /* Mouse up.  If in the same position as it went down
             * then we return the value set above, which goes into
             * the character input stream, which gets processed as
             * a mouse event by some upper layer, which calls to 
             * mouse_get_last(). */
            if (lrow == row && lcol == col) {
                rv = mouse_val;
            }
            break;
            
        case M_EVENT_TRACK:
            break;
        }
    }

    return(rv);
}


/*
 * mouse_get_last - Get last mouse event.
 *
 */
void
mouse_get_last(mousehandler_t *f, MOUSEPRESS *mp)
{
    if (f != NULL)
        *f  = lastf;
    if (mp != NULL) {
        mp->mevent      = levent;
        mp->row         = lrow;
        mp->col         = lcol;
        mp->doubleclick = doubleclick;
        mp->button      = lbutton;
        mp->flags       = lflags;
    }
}



/*
 * register_key - register the given keystroke to accept mouse events
 */
void
register_key(int i, unsigned rval, char *label, void (*label_printer)(),
             int row, int col, int len, COLOR_PAIR *kn, COLOR_PAIR *kl)
{
    if(i > 11)
      return;

    menuitems[i].val   = rval;
    menuitems[i].tl.r  = menuitems[i].br.r = row;
    menuitems[i].tl.c  = col;
    menuitems[i].br.c  = col + len;
    menuitems[i].lbl.r = menuitems[i].tl.r;
    menuitems[i].lbl.c = menuitems[i].tl.c;
    menuitems[i].label_hiliter = label_printer;
    if(menuitems[i].label){
        free(menuitems[i].label);
        menuitems[i].label = NULL;
    }
    if(menuitems[i].kncp)
        free_color_pair(&menuitems[i].kncp);
    if(menuitems[i].klcp)
        free_color_pair(&menuitems[i].klcp);
    if(kn)
      menuitems[i].kncp = new_color_pair(kn->fg, kn->bg);
    else 
      menuitems[i].kncp = NULL;
    if(kl)
      menuitems[i].klcp = new_color_pair(kl->fg, kl->bg);
    else 
      menuitems[i].klcp = NULL;    

    if(label){
      size_t len;

      len = strlen(label);
      if((menuitems[i].label = (char *)malloc((len+1)*sizeof(char))) != NULL){
        strncpy(menuitems[i].label, label, len);
        menuitems[i].label[len] = '\0';
      }
    }
}


int
mouse_on_key(int row, int col)
{
    int i;

    for(i = 0; i < 12; i++)
      if(M_ACTIVE(row, col, &menuitems[i]))
        return(TRUE);
        
    return(FALSE);
}
#endif  /* MOUSE */


/* 
 * Below are functions for use outside pico to manipulate text
 * in a pico's native format (circular linked list of lines).
 *
 * The idea is to streamline pico use by making it fairly easy
 * for outside programs to prepare text intended for pico's use.
 * The simple char * alternative is messy as it requires two copies
 * of the same text, and isn't very economic in limited memory
 * situations (THANKS BELLEVUE-BILLY.).
 */
typedef struct picotext {
    LINE *linep;
    LINE *dotp;
    int doto;
    short crinread;
} PICOTEXT;

#define PT(X)   ((PICOTEXT *)(X))

/*
 * pico_get - return window struct pointer used as a handle
 *            to the other pico_xxx routines.
 */
void *
pico_get(void)
{
   PICOTEXT *wp = NULL;
   LINE     *lp = NULL;

   if((wp = (PICOTEXT *)malloc(sizeof(PICOTEXT))) != NULL){
       wp->crinread = 0;
       if((lp = lalloc(0)) == NULL){
           free(wp);
           return(NULL);
       }

       wp->dotp = wp->linep = lp->l_fp = lp->l_bp = lp;
       wp->doto = 0;
   }
   else
     emlwrite("Can't allocate space for text", NULL);

   return((void *)wp);
}

/*
 * pico_give - free resources and give up picotext struct
 */
void
pico_give(void *w)
{
    register LINE *lp;
    register LINE *fp;

    fp = lforw(PT(w)->linep);
    while((lp = fp) != PT(w)->linep){
        fp = lforw(lp);
        free(lp);
    }
    free(PT(w)->linep);
    free((PICOTEXT *)w);
}

/*
 * pico_readc - return char at current point.  Up to calling routines
 *              to keep cumulative count of chars.
 *              The characters in PT are UCS-4 characters. The caller
 *              of pico_readc is expecting UTF-8 chars. We convert
 *              each UCS-4 character to a string of UTF-8 characters
 *              and return them one at a time.
 */
int
pico_readc(void *w, unsigned char *c, int flags)
{
    int rv     = 0;
    UCS ucs;
    static unsigned char obuf[6];
    static unsigned char *obufpend = obuf;
    static unsigned char *obufpnext = obuf;

    if(!(flags & PICOREADC_NOUCS)){
        if(obufpend > obuf){
            *c = *obufpnext++;
            rv++;
            if(obufpnext >= obufpend){
                obufpend = obuf;
                obufpnext = obuf;
            }

            return(rv);
        }
    }

    if(PT(w)->crinread){
        *c = '\012';                            /* return LF */
        PT(w)->crinread = 0;
        rv++;
    }
    else if(PT(w)->doto < llength(PT(w)->dotp)){ /* normal char to return */
        if(flags & PICOREADC_NOUCS){
            *c = (unsigned char) lgetc(PT(w)->dotp, (PT(w)->doto)++).c;
            rv++;
        }
        else{
            rv++;
            ucs = lgetc(PT(w)->dotp, (PT(w)->doto)++).c;
            obufpend = utf8_put(obuf, (unsigned long) ucs);
            obufpnext = obuf;
            if(obufpend > obuf){
                *c = *obufpnext++;
                if(obufpnext >= obufpend){
                    obufpend = obuf;
                    obufpnext = obuf;
                }
            }
            else
              *c = '?';
        }
    }
    else if(PT(w)->dotp != PT(w)->linep){ /* return line break */
        PT(w)->dotp = lforw(PT(w)->dotp);
        PT(w)->doto = 0;
#if     defined(DOS) || defined(OS2)
        *c = '\015';
        PT(w)->crinread++;
#else
        *c = '\012';                            /* return local eol! */
#endif
        rv++;
    }                                           /* else no chars to return */

    return(rv);
}


/*
 * pico_writec - write a char into picotext and advance pointers.
 *               Up to calling routines to keep track of total chars
 *               written.
 *               Incoming text (c) is UTF-8 and written chars are UCS-4.
 *               We need to collect up multiple chars to make a single
 *               UCS-4 char, so there needs to be some state between calls.
 */
int
pico_writec(void *w, int c, int flags)
{
    int   rv = 0;

    if(c == '\r')                               /* ignore CR's */
      rv++;                                     /* so fake it */
    else if(c == '\n'){                         /* insert newlines on LF */
        /*
         * OK, if there are characters on the current line or 
         * dotp is pointing to the delimiter line, insert a newline
         * No here's the tricky bit; preserve the implicit EOF newline.
         */
        if(lforw(PT(w)->dotp) == PT(w)->linep && PT(w)->dotp != PT(w)->linep){
            PT(w)->dotp = PT(w)->linep;
            PT(w)->doto = 0;
        }
        else{
            register LINE *lp;

            if((lp = lalloc(0)) == NULL){
                emlwrite("Can't allocate space for more characters",NULL);
                return(0);
            }

            if(PT(w)->dotp == PT(w)->linep){
                lforw(lp) = PT(w)->linep;
                lback(lp) = lback(PT(w)->linep);
                lforw(lback(lp)) = lback(PT(w)->linep) = lp;
            }
            else{
                lforw(lp) = lforw(PT(w)->dotp);
                lback(lp) = PT(w)->dotp;
                lback(lforw(lp)) = lforw(PT(w)->dotp) = lp;
                PT(w)->dotp = lp;
                PT(w)->doto = 0;
            }
        }

        rv++;
    }
    else{
        if(flags & PICOREADC_NOUCS){
            /*
             * With this flag we're reverting to the old behavior where no
             * UTF-8 to UCS-4 translation takes place. We assume nothing
             * about the incoming byte stream. We just write a byte at a
             * time. So even though it's being stored in PT each
             * item is really limited to a single octet value.
             */
            rv = geninsert(&PT(w)->dotp, &PT(w)->doto, PT(w)->linep, c, 0, 1, NULL);
        }
        else{
            static unsigned char cbuf[6];
            static unsigned char *cbufp = cbuf;
            UCS obuf[MAX(MB_LEN_MAX,32)];
            int  i, outchars = 0;

            if(cbufp < cbuf+sizeof(cbuf)){
                unsigned char *inputp;
                unsigned long remaining_octets;
                UCS ucs;

                *cbufp++ = (unsigned char) c;
                inputp = cbuf;
                remaining_octets = (cbufp - cbuf) * sizeof(unsigned char);
                ucs = (UCS) utf8_get(&inputp, &remaining_octets);

                switch(ucs){
                  case U8G_ENDSTRG:     /* incomplete character, wait */
                  case U8G_ENDSTRI:     /* incomplete character, wait */
                    break;

                  default:
                    if(ucs & U8G_ERROR || ucs == UBOGON){
                        /*
                         * None of these cases is supposed to happen. If it
                         * does happen then the input stream isn't UTF-8
                         * so something is wrong. Treat each character in the
                         * input buffer as a separate error character and
                         * print a '?' for each.
                         */
                        for(inputp = cbuf; inputp < cbufp; inputp++)
                          obuf[outchars++] = '?';

                        cbufp = cbuf;
                    }
                    else{
                        /* got a character */
                        if(ucs >= 0x80 && wcellwidth(ucs) < 0){
                            /*
                             * This happens when we have a UTF-8 character that
                             * we aren't able to print in our locale. For example,
                             * if the locale is setup with the terminal
                             * expecting ISO-8859-1 characters then there are
                             * lots of UTF-8 characters that can't be printed.
                             * Print a '?' instead.
 This may be the wrong thing to do. What happens if user
 is just forwarding and doesn't edit. We are going to lose
 the original value, aren't we? Maybe we do this only
 when printing to the screen instead.
                             */
                            obuf[outchars++] = '?';
                        }
                        else{
                            /*
                             * A regular ucs character
                             */
                            obuf[outchars++] = ucs;
                        }

                        /* update the input buffer */
                        if(inputp >= cbufp)     /* this should be the case */
                          cbufp = cbuf;
                        else{           /* extra chars for some reason? */
                            unsigned char *q, *newcbufp;

                            newcbufp = (cbufp - inputp) + cbuf;
                            q = cbuf;
                            while(inputp < cbufp)
                              *q++ = *inputp++;

                            cbufp = newcbufp;
                        }
                    }

                    break;
                }
            }
            else{                       /* error */
                obuf[0] = '?';
                outchars = 1;
                cbufp = cbuf;           /* start over */
            }

            /*
             * Unless we have trouble translating outchars will be
             * either 1 or 0. It is the UCS-4 character that we converted
             * the input to. It's an array just so it can hold ? when
             * there is trouble.
             */
            rv = 1;
            for(i = 0; rv && i < outchars; i++)
              if(!geninsert(&PT(w)->dotp, &PT(w)->doto, PT(w)->linep, obuf[i], 0, 1, NULL))
                rv = 0;
        }
    }

    /*
     * Warning, this is no longer number written, because when we have a
     * multibyte UTF-8 character we won't write anything until we get all
     * the bytes.
     */
    return((rv) ? 1 : 0);                       /* return number written */
}


/*
 * pico_puts - just write the given string into the text
 */
int
pico_puts(void *w, char *s, int flags)
{
    int rv = 0;

    if(*s != '\0'){
        rv = 1;
        while(rv && *s != '\0')
          if(!pico_writec(w, (int)*s++, flags))
            rv = 0;
    }

    return((rv) ? 1 : 0);
}


/*
 * pico_seek - position dotp and dot at requested location
 */
int
pico_seek(void *w, long offset, int orig)
{
    register LINE *lp;

    PT(w)->crinread = 0;
    switch(orig){
      case 0 :                          /* SEEK_SET */
        PT(w)->dotp = lforw(PT(w)->linep);
        PT(w)->doto = 0;
      case 1 :                          /* SEEK_CUR */
        lp = PT(w)->dotp;
        while(lp != PT(w)->linep){
            if(offset <= llength(lp)){
                PT(w)->doto = (int)offset;
                PT(w)->dotp = lp;
                break;
            }

            offset -= ((long)llength(lp)
#if defined(DOS) || defined(OS2)
                       + 2L);
#else
                       + 1L);
#endif
            lp = lforw(lp);
        }
        break;

      case 2 :                          /* SEEK_END */
        PT(w)->dotp = lback(PT(w)->linep);
        PT(w)->doto = llength(PT(w)->dotp);
        break;
      default :
        return(-1);
    }

    return(0);
}


/*
 * breplace - replace the current window's text with the given 
 *            LINEs
 */
void
breplace(void *w)
{
    register LINE *lp;
    register LINE *fp;

    fp = lforw(curbp->b_linep);
    while((lp = fp) != curbp->b_linep){         /* blast old lines */
        fp = lforw(lp);
        free(lp);
    }
    free(curbp->b_linep);

    curbp->b_linep   = PT(w)->linep;                    /* arrange pointers */

    /*
     * Undo space-stuffing that was done when we were preparing to send.
     * Some error happened so we're back to the composer.
     */
    if(Pmaster && Pmaster->space_stuffed){
        Pmaster->space_stuffed = 0;
        for(lp = lforw(curbp->b_linep); lp != curbp->b_linep; lp = lforw(lp)){
            if(llength(lp) && ucs4_isspace(lgetc(lp, 0).c)){
              curwp->w_dotp = lp;
              curwp->w_doto = 0;
              forwdel(FALSE,1);
            }
        }
    }

    curwp->w_linep   = lforw(curbp->b_linep);
    curwp->w_dotp    = lforw(curbp->b_linep);
    curwp->w_doto    = 0;
    curwp->w_markp   = curwp->w_imarkp = NULL;
    curwp->w_marko   = curwp->w_imarko = 0;

    curbp->b_dotp    = curwp->w_dotp;
    curbp->b_doto    = curbp->b_marko  = 0;
    curbp->b_markp   = NULL;
    curbp->b_linecnt = -1;

    curwp->w_flag |= WFHARD;
}


#ifdef  _WINDOWS
/*
 *
 */
int
composer_file_drop(int x, int y, char *filename)
{
    int attached = 0;
    EML eml;

    if((ComposerTopLine > 2 && x <= ComposerTopLine)
       || !LikelyASCII(filename)){
        AppendAttachment(filename, NULL, NULL);
        attached++;
    }
    else{
        setimark(FALSE, 1);
        ifile(filename);
        swapimark(FALSE, 1);
    }

    if(ComposerEditing){                /* update display */
        PaintBody(0);
    }
    else{
        pico_refresh(0, 1);
        update();
    }

    eml.s = filename;
    if(attached)
      emlwrite(_("Attached dropped file \"%s\""), &eml);
    else
      emlwrite(_("Inserted dropped file \"%s\""), &eml);

    if(ComposerEditing){                /* restore cursor */
        HeaderPaintCursor();
    }
    else{
        curwp->w_flag |= WFHARD;
        update();
    }

    return(1);
}


int
pico_cursor(int col, long row)
{
    return((row > 1 && row <= term.t_nrow - (term.t_mrow + 1))
             ? MSWIN_CURSOR_IBEAM
             : MSWIN_CURSOR_ARROW);
}
#endif /* _WINDOWS */