Add wide font support to Core Text renderer

[MacVim/KaoriYa.git] / src / ui.c

/* vi:set ts=8 sts=4 sw=4:
 *
 * VIM - Vi IMproved    by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

/*
 * ui.c: functions that handle the user interface.
 * 1. Keyboard input stuff, and a bit of windowing stuff.  These are called
 *    before the machine specific stuff (mch_*) so that we can call the GUI
 *    stuff instead if the GUI is running.
 * 2. Clipboard stuff.
 * 3. Input buffer stuff.
 */

#include "vim.h"

    void
ui_write(s, len)
    char_u  *s;
    int     len;
{
#ifdef FEAT_GUI
    if (gui.in_use && !gui.dying && !gui.starting)
    {
        gui_write(s, len);
        if (p_wd)
            gui_wait_for_chars(p_wd);
        return;
    }
#endif
#ifndef NO_CONSOLE
    /* Don't output anything in silent mode ("ex -s") unless 'verbose' set */
    if (!(silent_mode && p_verbose == 0))
    {
#ifdef FEAT_MBYTE
        char_u  *tofree = NULL;

        if (output_conv.vc_type != CONV_NONE)
        {
            /* Convert characters from 'encoding' to 'termencoding'. */
            tofree = string_convert(&output_conv, s, &len);
            if (tofree != NULL)
                s = tofree;
        }
#endif

        mch_write(s, len);

#ifdef FEAT_MBYTE
        if (output_conv.vc_type != CONV_NONE)
            vim_free(tofree);
#endif
    }
#endif
}

#if defined(UNIX) || defined(VMS) || defined(PROTO)
/*
 * When executing an external program, there may be some typed characters that
 * are not consumed by it.  Give them back to ui_inchar() and they are stored
 * here for the next call.
 */
static char_u *ta_str = NULL;
static int ta_off;      /* offset for next char to use when ta_str != NULL */
static int ta_len;      /* length of ta_str when it's not NULL*/

    void
ui_inchar_undo(s, len)
    char_u      *s;
    int         len;
{
    char_u  *new;
    int     newlen;

    newlen = len;
    if (ta_str != NULL)
        newlen += ta_len - ta_off;
    new = alloc(newlen);
    if (new != NULL)
    {
        if (ta_str != NULL)
        {
            mch_memmove(new, ta_str + ta_off, (size_t)(ta_len - ta_off));
            mch_memmove(new + ta_len - ta_off, s, (size_t)len);
            vim_free(ta_str);
        }
        else
            mch_memmove(new, s, (size_t)len);
        ta_str = new;
        ta_len = newlen;
        ta_off = 0;
    }
}
#endif

/*
 * ui_inchar(): low level input funcion.
 * Get characters from the keyboard.
 * Return the number of characters that are available.
 * If "wtime" == 0 do not wait for characters.
 * If "wtime" == -1 wait forever for characters.
 * If "wtime" > 0 wait "wtime" milliseconds for a character.
 *
 * "tb_change_cnt" is the value of typebuf.tb_change_cnt if "buf" points into
 * it.  When typebuf.tb_change_cnt changes (e.g., when a message is received
 * from a remote client) "buf" can no longer be used.  "tb_change_cnt" is NULL
 * otherwise.
 */
    int
ui_inchar(buf, maxlen, wtime, tb_change_cnt)
    char_u      *buf;
    int         maxlen;
    long        wtime;      /* don't use "time", MIPS cannot handle it */
    int         tb_change_cnt;
{
    int         retval = 0;

#if defined(FEAT_GUI) && (defined(UNIX) || defined(VMS))
    /*
     * Use the typeahead if there is any.
     */
    if (ta_str != NULL)
    {
        if (maxlen >= ta_len - ta_off)
        {
            mch_memmove(buf, ta_str + ta_off, (size_t)ta_len);
            vim_free(ta_str);
            ta_str = NULL;
            return ta_len;
        }
        mch_memmove(buf, ta_str + ta_off, (size_t)maxlen);
        ta_off += maxlen;
        return maxlen;
    }
#endif

#ifdef FEAT_PROFILE
    if (do_profiling == PROF_YES && wtime != 0)
        prof_inchar_enter();
#endif

#ifdef NO_CONSOLE_INPUT
    /* Don't wait for character input when the window hasn't been opened yet.
     * Do try reading, this works when redirecting stdin from a file.
     * Must return something, otherwise we'll loop forever.  If we run into
     * this very often we probably got stuck, exit Vim. */
    if (no_console_input())
    {
        static int count = 0;

# ifndef NO_CONSOLE
        retval = mch_inchar(buf, maxlen, (wtime >= 0 && wtime < 10)
                                                ? 10L : wtime, tb_change_cnt);
        if (retval > 0 || typebuf_changed(tb_change_cnt) || wtime >= 0)
            goto theend;
# endif
        if (wtime == -1 && ++count == 1000)
            read_error_exit();
        buf[0] = CAR;
        retval = 1;
        goto theend;
    }
#endif

    /* If we are going to wait for some time or block... */
    if (wtime == -1 || wtime > 100L)
    {
        /* ... allow signals to kill us. */
        (void)vim_handle_signal(SIGNAL_UNBLOCK);

        /* ... there is no need for CTRL-C to interrupt something, don't let
         * it set got_int when it was mapped. */
        if (mapped_ctrl_c)
            ctrl_c_interrupts = FALSE;
    }

#ifdef FEAT_GUI
    if (gui.in_use)
    {
        if (gui_wait_for_chars(wtime) && !typebuf_changed(tb_change_cnt))
            retval = read_from_input_buf(buf, (long)maxlen);
    }
#endif
#ifndef NO_CONSOLE
# ifdef FEAT_GUI
    else
# endif
    {
        retval = mch_inchar(buf, maxlen, wtime, tb_change_cnt);
    }
#endif

    if (wtime == -1 || wtime > 100L)
        /* block SIGHUP et al. */
        (void)vim_handle_signal(SIGNAL_BLOCK);

    ctrl_c_interrupts = TRUE;

#ifdef NO_CONSOLE_INPUT
theend:
#endif
#ifdef FEAT_PROFILE
    if (do_profiling == PROF_YES && wtime != 0)
        prof_inchar_exit();
#endif
    return retval;
}

/*
 * return non-zero if a character is available
 */
    int
ui_char_avail()
{
#ifdef FEAT_GUI
    if (gui.in_use)
    {
        gui_mch_update();
        return input_available();
    }
#endif
#ifndef NO_CONSOLE
# ifdef NO_CONSOLE_INPUT
    if (no_console_input())
        return 0;
# endif
    return mch_char_avail();
#else
    return 0;
#endif
}

/*
 * Delay for the given number of milliseconds.  If ignoreinput is FALSE then we
 * cancel the delay if a key is hit.
 */
    void
ui_delay(msec, ignoreinput)
    long        msec;
    int         ignoreinput;
{
#ifdef FEAT_GUI
    if (gui.in_use && !ignoreinput)
        gui_wait_for_chars(msec);
    else
#endif
    {
#if defined(FEAT_GUI_MACVIM)
        /* MacVim tries to be conservative with flushing, but when Vim takes a
         * nap it really must flush (else timed error messages might not appear
         * etc.).  Note that gui_mch_wait_for_chars() already does force a
         * flush, so only do it here. */
        if (gui.in_use)
            gui_macvim_force_flush();
#endif
        mch_delay(msec, ignoreinput);
    }
}

/*
 * If the machine has job control, use it to suspend the program,
 * otherwise fake it by starting a new shell.
 * When running the GUI iconify the window.
 */
    void
ui_suspend()
{
#ifdef FEAT_GUI
    if (gui.in_use)
    {
        gui_mch_iconify();
        return;
    }
#endif
    mch_suspend();
}

#if !defined(UNIX) || !defined(SIGTSTP) || defined(PROTO) || defined(__BEOS__)
/*
 * When the OS can't really suspend, call this function to start a shell.
 * This is never called in the GUI.
 */
    void
suspend_shell()
{
    if (*p_sh == NUL)
        EMSG(_(e_shellempty));
    else
    {
        MSG_PUTS(_("new shell started\n"));
        do_shell(NULL, 0);
    }
}
#endif

/*
 * Try to get the current Vim shell size.  Put the result in Rows and Columns.
 * Use the new sizes as defaults for 'columns' and 'lines'.
 * Return OK when size could be determined, FAIL otherwise.
 */
    int
ui_get_shellsize()
{
    int     retval;

#ifdef FEAT_GUI
    if (gui.in_use
# ifdef FEAT_GUI_MACVIM
            /* Avoid using terminal dimensions for GUI window.  MacVim
             * autosaves the dimensions of the first window. */
            || gui.starting
# endif
            )
        retval = gui_get_shellsize();
    else
#endif
        retval = mch_get_shellsize();

    check_shellsize();

    /* adjust the default for 'lines' and 'columns' */
    if (retval == OK)
    {
        set_number_default("lines", Rows);
        set_number_default("columns", Columns);
    }
    return retval;
}

/*
 * Set the size of the Vim shell according to Rows and Columns, if possible.
 * The gui_set_shellsize() or mch_set_shellsize() function will try to set the
 * new size.  If this is not possible, it will adjust Rows and Columns.
 */
    void
ui_set_shellsize(mustset)
    int         mustset UNUSED; /* set by the user */
{
#ifdef FEAT_GUI
    if (gui.in_use)
        gui_set_shellsize(mustset,
# ifdef WIN3264
                TRUE
# else
                FALSE
# endif
                , RESIZE_BOTH);
    else
#endif
        mch_set_shellsize();
}

/*
 * Called when Rows and/or Columns changed.  Adjust scroll region and mouse
 * region.
 */
    void
ui_new_shellsize()
{
    if (full_screen && !exiting)
    {
#ifdef FEAT_GUI
        if (gui.in_use)
            gui_new_shellsize();
        else
#endif
            mch_new_shellsize();
    }
}

    void
ui_breakcheck()
{
#ifdef FEAT_GUI
    if (gui.in_use)
        gui_mch_update();
    else
#endif
        mch_breakcheck();
}

/*****************************************************************************
 * Functions for copying and pasting text between applications.
 * This is always included in a GUI version, but may also be included when the
 * clipboard and mouse is available to a terminal version such as xterm.
 * Note: there are some more functions in ops.c that handle selection stuff.
 *
 * Also note that the majority of functions here deal with the X 'primary'
 * (visible - for Visual mode use) selection, and only that. There are no
 * versions of these for the 'clipboard' selection, as Visual mode has no use
 * for them.
 */

#if defined(FEAT_CLIPBOARD) || defined(PROTO)

/*
 * Selection stuff using Visual mode, for cutting and pasting text to other
 * windows.
 */

/*
 * Call this to initialise the clipboard.  Pass it FALSE if the clipboard code
 * is included, but the clipboard can not be used, or TRUE if the clipboard can
 * be used.  Eg unix may call this with FALSE, then call it again with TRUE if
 * the GUI starts.
 */
    void
clip_init(can_use)
    int     can_use;
{
    VimClipboard *cb;

    cb = &clip_star;
    for (;;)
    {
        cb->available  = can_use;
        cb->owned      = FALSE;
        cb->start.lnum = 0;
        cb->start.col  = 0;
        cb->end.lnum   = 0;
        cb->end.col    = 0;
        cb->state      = SELECT_CLEARED;

        if (cb == &clip_plus)
            break;
        cb = &clip_plus;
    }
}

/*
 * Check whether the VIsual area has changed, and if so try to become the owner
 * of the selection, and free any old converted selection we may still have
 * lying around.  If the VIsual mode has ended, make a copy of what was
 * selected so we can still give it to others.  Will probably have to make sure
 * this is called whenever VIsual mode is ended.
 */
    void
clip_update_selection()
{
    pos_T    start, end;

    /* If visual mode is only due to a redo command ("."), then ignore it */
    if (!redo_VIsual_busy && VIsual_active && (State & NORMAL))
    {
        if (lt(VIsual, curwin->w_cursor))
        {
            start = VIsual;
            end = curwin->w_cursor;
#ifdef FEAT_MBYTE
            if (has_mbyte)
                end.col += (*mb_ptr2len)(ml_get_cursor()) - 1;
#endif
        }
        else
        {
            start = curwin->w_cursor;
            end = VIsual;
        }
        if (!equalpos(clip_star.start, start)
                || !equalpos(clip_star.end, end)
                || clip_star.vmode != VIsual_mode)
        {
            clip_clear_selection();
            clip_star.start = start;
            clip_star.end = end;
            clip_star.vmode = VIsual_mode;
            clip_free_selection(&clip_star);
            clip_own_selection(&clip_star);
            clip_gen_set_selection(&clip_star);
        }
    }
}

    void
clip_own_selection(cbd)
    VimClipboard        *cbd;
{
    /*
     * Also want to check somehow that we are reading from the keyboard rather
     * than a mapping etc.
     */
    if (!cbd->owned && cbd->available)
    {
        cbd->owned = (clip_gen_own_selection(cbd) == OK);
#ifdef FEAT_X11
        if (cbd == &clip_star)
        {
            /* May have to show a different kind of highlighting for the
             * selected area.  There is no specific redraw command for this,
             * just redraw all windows on the current buffer. */
            if (cbd->owned
                    && (get_real_state() == VISUAL
                                            || get_real_state() == SELECTMODE)
                    && clip_isautosel()
                    && hl_attr(HLF_V) != hl_attr(HLF_VNC))
                redraw_curbuf_later(INVERTED_ALL);
        }
#endif
    }
}

    void
clip_lose_selection(cbd)
    VimClipboard        *cbd;
{
#ifdef FEAT_X11
    int     was_owned = cbd->owned;
#endif
    int     visual_selection = (cbd == &clip_star);

    clip_free_selection(cbd);
    cbd->owned = FALSE;
    if (visual_selection)
        clip_clear_selection();
    clip_gen_lose_selection(cbd);
#ifdef FEAT_X11
    if (visual_selection)
    {
        /* May have to show a different kind of highlighting for the selected
         * area.  There is no specific redraw command for this, just redraw all
         * windows on the current buffer. */
        if (was_owned
                && (get_real_state() == VISUAL
                                            || get_real_state() == SELECTMODE)
                && clip_isautosel()
                && hl_attr(HLF_V) != hl_attr(HLF_VNC))
        {
            update_curbuf(INVERTED_ALL);
            setcursor();
            cursor_on();
            out_flush();
# ifdef FEAT_GUI
            if (gui.in_use)
                gui_update_cursor(TRUE, FALSE);
# endif
        }
    }
#endif
}

    void
clip_copy_selection()
{
    if (VIsual_active && (State & NORMAL) && clip_star.available)
    {
        if (clip_isautosel())
            clip_update_selection();
        clip_free_selection(&clip_star);
        clip_own_selection(&clip_star);
        if (clip_star.owned)
            clip_get_selection(&clip_star);
        clip_gen_set_selection(&clip_star);
    }
}

/*
 * Called when Visual mode is ended: update the selection.
 */
    void
clip_auto_select()
{
    if (clip_isautosel())
        clip_copy_selection();
}

/*
 * Return TRUE if automatic selection of Visual area is desired.
 */
    int
clip_isautosel()
{
    return (
#ifdef FEAT_GUI
            gui.in_use ? (vim_strchr(p_go, GO_ASEL) != NULL) :
#endif
            clip_autoselect);
}


/*
 * Stuff for general mouse selection, without using Visual mode.
 */

static int clip_compare_pos __ARGS((int row1, int col1, int row2, int col2));
static void clip_invert_area __ARGS((int, int, int, int, int how));
static void clip_invert_rectangle __ARGS((int row, int col, int height, int width, int invert));
static void clip_get_word_boundaries __ARGS((VimClipboard *, int, int));
static int  clip_get_line_end __ARGS((int));
static void clip_update_modeless_selection __ARGS((VimClipboard *, int, int,
                                                    int, int));

/* flags for clip_invert_area() */
#define CLIP_CLEAR      1
#define CLIP_SET        2
#define CLIP_TOGGLE     3

/*
 * Start, continue or end a modeless selection.  Used when editing the
 * command-line and in the cmdline window.
 */
    void
clip_modeless(button, is_click, is_drag)
    int         button;
    int         is_click;
    int         is_drag;
{
    int         repeat;

    repeat = ((clip_star.mode == SELECT_MODE_CHAR
                || clip_star.mode == SELECT_MODE_LINE)
                                              && (mod_mask & MOD_MASK_2CLICK))
            || (clip_star.mode == SELECT_MODE_WORD
                                             && (mod_mask & MOD_MASK_3CLICK));
    if (is_click && button == MOUSE_RIGHT)
    {
        /* Right mouse button: If there was no selection, start one.
         * Otherwise extend the existing selection. */
        if (clip_star.state == SELECT_CLEARED)
            clip_start_selection(mouse_col, mouse_row, FALSE);
        clip_process_selection(button, mouse_col, mouse_row, repeat);
    }
    else if (is_click)
        clip_start_selection(mouse_col, mouse_row, repeat);
    else if (is_drag)
    {
        /* Don't try extending a selection if there isn't one.  Happens when
         * button-down is in the cmdline and them moving mouse upwards. */
        if (clip_star.state != SELECT_CLEARED)
            clip_process_selection(button, mouse_col, mouse_row, repeat);
    }
    else /* release */
        clip_process_selection(MOUSE_RELEASE, mouse_col, mouse_row, FALSE);
}

/*
 * Compare two screen positions ala strcmp()
 */
    static int
clip_compare_pos(row1, col1, row2, col2)
    int         row1;
    int         col1;
    int         row2;
    int         col2;
{
    if (row1 > row2) return(1);
    if (row1 < row2) return(-1);
    if (col1 > col2) return(1);
    if (col1 < col2) return(-1);
                     return(0);
}

/*
 * Start the selection
 */
    void
clip_start_selection(col, row, repeated_click)
    int         col;
    int         row;
    int         repeated_click;
{
    VimClipboard        *cb = &clip_star;

    if (cb->state == SELECT_DONE)
        clip_clear_selection();

    row = check_row(row);
    col = check_col(col);
#ifdef FEAT_MBYTE
    col = mb_fix_col(col, row);
#endif

    cb->start.lnum  = row;
    cb->start.col   = col;
    cb->end         = cb->start;
    cb->origin_row  = (short_u)cb->start.lnum;
    cb->state       = SELECT_IN_PROGRESS;

    if (repeated_click)
    {
        if (++cb->mode > SELECT_MODE_LINE)
            cb->mode = SELECT_MODE_CHAR;
    }
    else
        cb->mode = SELECT_MODE_CHAR;

#ifdef FEAT_GUI
    /* clear the cursor until the selection is made */
    if (gui.in_use)
        gui_undraw_cursor();
#endif

    switch (cb->mode)
    {
        case SELECT_MODE_CHAR:
            cb->origin_start_col = cb->start.col;
            cb->word_end_col = clip_get_line_end((int)cb->start.lnum);
            break;

        case SELECT_MODE_WORD:
            clip_get_word_boundaries(cb, (int)cb->start.lnum, cb->start.col);
            cb->origin_start_col = cb->word_start_col;
            cb->origin_end_col   = cb->word_end_col;

            clip_invert_area((int)cb->start.lnum, cb->word_start_col,
                            (int)cb->end.lnum, cb->word_end_col, CLIP_SET);
            cb->start.col = cb->word_start_col;
            cb->end.col   = cb->word_end_col;
            break;

        case SELECT_MODE_LINE:
            clip_invert_area((int)cb->start.lnum, 0, (int)cb->start.lnum,
                            (int)Columns, CLIP_SET);
            cb->start.col = 0;
            cb->end.col   = Columns;
            break;
    }

    cb->prev = cb->start;

#ifdef DEBUG_SELECTION
    printf("Selection started at (%u,%u)\n", cb->start.lnum, cb->start.col);
#endif
}

/*
 * Continue processing the selection
 */
    void
clip_process_selection(button, col, row, repeated_click)
    int         button;
    int         col;
    int         row;
    int_u       repeated_click;
{
    VimClipboard        *cb = &clip_star;
    int                 diff;
    int                 slen = 1;       /* cursor shape width */

    if (button == MOUSE_RELEASE)
    {
        /* Check to make sure we have something selected */
        if (cb->start.lnum == cb->end.lnum && cb->start.col == cb->end.col)
        {
#ifdef FEAT_GUI
            if (gui.in_use)
                gui_update_cursor(FALSE, FALSE);
#endif
            cb->state = SELECT_CLEARED;
            return;
        }

#ifdef DEBUG_SELECTION
        printf("Selection ended: (%u,%u) to (%u,%u)\n", cb->start.lnum,
                cb->start.col, cb->end.lnum, cb->end.col);
#endif
        if (clip_isautosel()
                || (
#ifdef FEAT_GUI
                    gui.in_use ? (vim_strchr(p_go, GO_ASELML) != NULL) :
#endif
                    clip_autoselectml))
            clip_copy_modeless_selection(FALSE);
#ifdef FEAT_GUI
        if (gui.in_use)
            gui_update_cursor(FALSE, FALSE);
#endif

        cb->state = SELECT_DONE;
        return;
    }

    row = check_row(row);
    col = check_col(col);
#ifdef FEAT_MBYTE
    col = mb_fix_col(col, row);
#endif

    if (col == (int)cb->prev.col && row == cb->prev.lnum && !repeated_click)
        return;

    /*
     * When extending the selection with the right mouse button, swap the
     * start and end if the position is before half the selection
     */
    if (cb->state == SELECT_DONE && button == MOUSE_RIGHT)
    {
        /*
         * If the click is before the start, or the click is inside the
         * selection and the start is the closest side, set the origin to the
         * end of the selection.
         */
        if (clip_compare_pos(row, col, (int)cb->start.lnum, cb->start.col) < 0
                || (clip_compare_pos(row, col,
                                           (int)cb->end.lnum, cb->end.col) < 0
                    && (((cb->start.lnum == cb->end.lnum
                            && cb->end.col - col > col - cb->start.col))
                        || ((diff = (cb->end.lnum - row) -
                                                   (row - cb->start.lnum)) > 0
                            || (diff == 0 && col < (int)(cb->start.col +
                                                         cb->end.col) / 2)))))
        {
            cb->origin_row = (short_u)cb->end.lnum;
            cb->origin_start_col = cb->end.col - 1;
            cb->origin_end_col = cb->end.col;
        }
        else
        {
            cb->origin_row = (short_u)cb->start.lnum;
            cb->origin_start_col = cb->start.col;
            cb->origin_end_col = cb->start.col;
        }
        if (cb->mode == SELECT_MODE_WORD && !repeated_click)
            cb->mode = SELECT_MODE_CHAR;
    }

    /* set state, for when using the right mouse button */
    cb->state = SELECT_IN_PROGRESS;

#ifdef DEBUG_SELECTION
    printf("Selection extending to (%d,%d)\n", row, col);
#endif

    if (repeated_click && ++cb->mode > SELECT_MODE_LINE)
        cb->mode = SELECT_MODE_CHAR;

    switch (cb->mode)
    {
        case SELECT_MODE_CHAR:
            /* If we're on a different line, find where the line ends */
            if (row != cb->prev.lnum)
                cb->word_end_col = clip_get_line_end(row);

            /* See if we are before or after the origin of the selection */
            if (clip_compare_pos(row, col, cb->origin_row,
                                                   cb->origin_start_col) >= 0)
            {
                if (col >= (int)cb->word_end_col)
                    clip_update_modeless_selection(cb, cb->origin_row,
                            cb->origin_start_col, row, (int)Columns);
                else
                {
#ifdef FEAT_MBYTE
                    if (has_mbyte && mb_lefthalve(row, col))
                        slen = 2;
#endif
                    clip_update_modeless_selection(cb, cb->origin_row,
                            cb->origin_start_col, row, col + slen);
                }
            }
            else
            {
#ifdef FEAT_MBYTE
                if (has_mbyte
                        && mb_lefthalve(cb->origin_row, cb->origin_start_col))
                    slen = 2;
#endif
                if (col >= (int)cb->word_end_col)
                    clip_update_modeless_selection(cb, row, cb->word_end_col,
                            cb->origin_row, cb->origin_start_col + slen);
                else
                    clip_update_modeless_selection(cb, row, col,
                            cb->origin_row, cb->origin_start_col + slen);
            }
            break;

        case SELECT_MODE_WORD:
            /* If we are still within the same word, do nothing */
            if (row == cb->prev.lnum && col >= (int)cb->word_start_col
                    && col < (int)cb->word_end_col && !repeated_click)
                return;

            /* Get new word boundaries */
            clip_get_word_boundaries(cb, row, col);

            /* Handle being after the origin point of selection */
            if (clip_compare_pos(row, col, cb->origin_row,
                    cb->origin_start_col) >= 0)
                clip_update_modeless_selection(cb, cb->origin_row,
                        cb->origin_start_col, row, cb->word_end_col);
            else
                clip_update_modeless_selection(cb, row, cb->word_start_col,
                        cb->origin_row, cb->origin_end_col);
            break;

        case SELECT_MODE_LINE:
            if (row == cb->prev.lnum && !repeated_click)
                return;

            if (clip_compare_pos(row, col, cb->origin_row,
                    cb->origin_start_col) >= 0)
                clip_update_modeless_selection(cb, cb->origin_row, 0, row,
                        (int)Columns);
            else
                clip_update_modeless_selection(cb, row, 0, cb->origin_row,
                        (int)Columns);
            break;
    }

    cb->prev.lnum = row;
    cb->prev.col  = col;

#ifdef DEBUG_SELECTION
        printf("Selection is: (%u,%u) to (%u,%u)\n", cb->start.lnum,
                cb->start.col, cb->end.lnum, cb->end.col);
#endif
}

#if 0 /* not used */
/*
 * Called after an Expose event to redraw the selection
 */
    void
clip_redraw_selection(x, y, w, h)
    int     x;
    int     y;
    int     w;
    int     h;
{
    VimClipboard    *cb = &clip_star;
    int             row1, col1, row2, col2;
    int             row;
    int             start;
    int             end;

    if (cb->state == SELECT_CLEARED)
        return;

    row1 = check_row(Y_2_ROW(y));
    col1 = check_col(X_2_COL(x));
    row2 = check_row(Y_2_ROW(y + h - 1));
    col2 = check_col(X_2_COL(x + w - 1));

    /* Limit the rows that need to be re-drawn */
    if (cb->start.lnum > row1)
        row1 = cb->start.lnum;
    if (cb->end.lnum < row2)
        row2 = cb->end.lnum;

    /* Look at each row that might need to be re-drawn */
    for (row = row1; row <= row2; row++)
    {
        /* For the first selection row, use the starting selection column */
        if (row == cb->start.lnum)
            start = cb->start.col;
        else
            start = 0;

        /* For the last selection row, use the ending selection column */
        if (row == cb->end.lnum)
            end = cb->end.col;
        else
            end = Columns;

        if (col1 > start)
            start = col1;

        if (col2 < end)
            end = col2 + 1;

        if (end > start)
            gui_mch_invert_rectangle(row, start, 1, end - start);
    }
}
#endif

# if defined(FEAT_GUI) || defined(PROTO)
/*
 * Redraw part of the selection if character at "row,col" is inside of it.
 * Only used for the GUI.
 */
    void
clip_may_redraw_selection(row, col, len)
    int         row, col;
    int         len;
{
    int         start = col;
    int         end = col + len;

    if (clip_star.state != SELECT_CLEARED
            && row >= clip_star.start.lnum
            && row <= clip_star.end.lnum)
    {
        if (row == clip_star.start.lnum && start < (int)clip_star.start.col)
            start = clip_star.start.col;
        if (row == clip_star.end.lnum && end > (int)clip_star.end.col)
            end = clip_star.end.col;
        if (end > start)
            clip_invert_area(row, start, row, end, 0);
    }
}
# endif

/*
 * Called from outside to clear selected region from the display
 */
    void
clip_clear_selection()
{
    VimClipboard    *cb = &clip_star;

    if (cb->state == SELECT_CLEARED)
        return;

    clip_invert_area((int)cb->start.lnum, cb->start.col, (int)cb->end.lnum,
                                                     cb->end.col, CLIP_CLEAR);
    cb->state = SELECT_CLEARED;
}

/*
 * Clear the selection if any lines from "row1" to "row2" are inside of it.
 */
    void
clip_may_clear_selection(row1, row2)
    int row1, row2;
{
    if (clip_star.state == SELECT_DONE
            && row2 >= clip_star.start.lnum
            && row1 <= clip_star.end.lnum)
        clip_clear_selection();
}

/*
 * Called before the screen is scrolled up or down.  Adjusts the line numbers
 * of the selection.  Call with big number when clearing the screen.
 */
    void
clip_scroll_selection(rows)
    int     rows;               /* negative for scroll down */
{
    int     lnum;

    if (clip_star.state == SELECT_CLEARED)
        return;

    lnum = clip_star.start.lnum - rows;
    if (lnum <= 0)
        clip_star.start.lnum = 0;
    else if (lnum >= screen_Rows)       /* scrolled off of the screen */
        clip_star.state = SELECT_CLEARED;
    else
        clip_star.start.lnum = lnum;

    lnum = clip_star.end.lnum - rows;
    if (lnum < 0)                       /* scrolled off of the screen */
        clip_star.state = SELECT_CLEARED;
    else if (lnum >= screen_Rows)
        clip_star.end.lnum = screen_Rows - 1;
    else
        clip_star.end.lnum = lnum;
}

/*
 * Invert a region of the display between a starting and ending row and column
 * Values for "how":
 * CLIP_CLEAR:  undo inversion
 * CLIP_SET:    set inversion
 * CLIP_TOGGLE: set inversion if pos1 < pos2, undo inversion otherwise.
 * 0: invert (GUI only).
 */
    static void
clip_invert_area(row1, col1, row2, col2, how)
    int         row1;
    int         col1;
    int         row2;
    int         col2;
    int         how;
{
    int         invert = FALSE;

    if (how == CLIP_SET)
        invert = TRUE;

    /* Swap the from and to positions so the from is always before */
    if (clip_compare_pos(row1, col1, row2, col2) > 0)
    {
        int tmp_row, tmp_col;

        tmp_row = row1;
        tmp_col = col1;
        row1    = row2;
        col1    = col2;
        row2    = tmp_row;
        col2    = tmp_col;
    }
    else if (how == CLIP_TOGGLE)
        invert = TRUE;

    /* If all on the same line, do it the easy way */
    if (row1 == row2)
    {
        clip_invert_rectangle(row1, col1, 1, col2 - col1, invert);
    }
    else
    {
        /* Handle a piece of the first line */
        if (col1 > 0)
        {
            clip_invert_rectangle(row1, col1, 1, (int)Columns - col1, invert);
            row1++;
        }

        /* Handle a piece of the last line */
        if (col2 < Columns - 1)
        {
            clip_invert_rectangle(row2, 0, 1, col2, invert);
            row2--;
        }

        /* Handle the rectangle thats left */
        if (row2 >= row1)
            clip_invert_rectangle(row1, 0, row2 - row1 + 1, (int)Columns,
                                                                      invert);
    }
}

/*
 * Invert or un-invert a rectangle of the screen.
 * "invert" is true if the result is inverted.
 */
    static void
clip_invert_rectangle(row, col, height, width, invert)
    int         row;
    int         col;
    int         height;
    int         width;
    int         invert;
{
#ifdef FEAT_GUI
    if (gui.in_use)
# ifdef FEAT_GUI_MACVIM
        gui_mch_invert_rectangle(row, col, height, width, invert);
# else
        gui_mch_invert_rectangle(row, col, height, width);
#endif
    else
#endif
        screen_draw_rectangle(row, col, height, width, invert);
}

/*
 * Copy the currently selected area into the '*' register so it will be
 * available for pasting.
 * When "both" is TRUE also copy to the '+' register.
 */
    void
clip_copy_modeless_selection(both)
    int         both UNUSED;
{
    char_u      *buffer;
    char_u      *bufp;
    int         row;
    int         start_col;
    int         end_col;
    int         line_end_col;
    int         add_newline_flag = FALSE;
    int         len;
#ifdef FEAT_MBYTE
    char_u      *p;
#endif
    int         row1 = clip_star.start.lnum;
    int         col1 = clip_star.start.col;
    int         row2 = clip_star.end.lnum;
    int         col2 = clip_star.end.col;

    /* Can't use ScreenLines unless initialized */
    if (ScreenLines == NULL)
        return;

    /*
     * Make sure row1 <= row2, and if row1 == row2 that col1 <= col2.
     */
    if (row1 > row2)
    {
        row = row1; row1 = row2; row2 = row;
        row = col1; col1 = col2; col2 = row;
    }
    else if (row1 == row2 && col1 > col2)
    {
        row = col1; col1 = col2; col2 = row;
    }
#ifdef FEAT_MBYTE
    /* correct starting point for being on right halve of double-wide char */
    p = ScreenLines + LineOffset[row1];
    if (enc_dbcs != 0)
        col1 -= (*mb_head_off)(p, p + col1);
    else if (enc_utf8 && p[col1] == 0)
        --col1;
#endif

    /* Create a temporary buffer for storing the text */
    len = (row2 - row1 + 1) * Columns + 1;
#ifdef FEAT_MBYTE
    if (enc_dbcs != 0)
        len *= 2;       /* max. 2 bytes per display cell */
    else if (enc_utf8)
        len *= MB_MAXBYTES;
#endif
    buffer = lalloc((long_u)len, TRUE);
    if (buffer == NULL)     /* out of memory */
        return;

    /* Process each row in the selection */
    for (bufp = buffer, row = row1; row <= row2; row++)
    {
        if (row == row1)
            start_col = col1;
        else
            start_col = 0;

        if (row == row2)
            end_col = col2;
        else
            end_col = Columns;

        line_end_col = clip_get_line_end(row);

        /* See if we need to nuke some trailing whitespace */
        if (end_col >= Columns && (row < row2 || end_col > line_end_col))
        {
            /* Get rid of trailing whitespace */
            end_col = line_end_col;
            if (end_col < start_col)
                end_col = start_col;

            /* If the last line extended to the end, add an extra newline */
            if (row == row2)
                add_newline_flag = TRUE;
        }

        /* If after the first row, we need to always add a newline */
        if (row > row1 && !LineWraps[row - 1])
            *bufp++ = NL;

        if (row < screen_Rows && end_col <= screen_Columns)
        {
#ifdef FEAT_MBYTE
            if (enc_dbcs != 0)
            {
                int     i;

                p = ScreenLines + LineOffset[row];
                for (i = start_col; i < end_col; ++i)
                    if (enc_dbcs == DBCS_JPNU && p[i] == 0x8e)
                    {
                        /* single-width double-byte char */
                        *bufp++ = 0x8e;
                        *bufp++ = ScreenLines2[LineOffset[row] + i];
                    }
                    else
                    {
                        *bufp++ = p[i];
                        if (MB_BYTE2LEN(p[i]) == 2)
                            *bufp++ = p[++i];
                    }
            }
            else if (enc_utf8)
            {
                int     off;
                int     i;
                int     ci;

                off = LineOffset[row];
                for (i = start_col; i < end_col; ++i)
                {
                    /* The base character is either in ScreenLinesUC[] or
                     * ScreenLines[]. */
                    if (ScreenLinesUC[off + i] == 0)
                        *bufp++ = ScreenLines[off + i];
                    else
                    {
                        bufp += utf_char2bytes(ScreenLinesUC[off + i], bufp);
                        for (ci = 0; ci < Screen_mco; ++ci)
                        {
                            /* Add a composing character. */
                            if (ScreenLinesC[ci][off + i] == 0)
                                break;
                            bufp += utf_char2bytes(ScreenLinesC[ci][off + i],
                                                                        bufp);
                        }
                    }
                    /* Skip right halve of double-wide character. */
                    if (ScreenLines[off + i + 1] == 0)
                        ++i;
                }
            }
            else
#endif
            {
                STRNCPY(bufp, ScreenLines + LineOffset[row] + start_col,
                                                         end_col - start_col);
                bufp += end_col - start_col;
            }
        }
    }

    /* Add a newline at the end if the selection ended there */
    if (add_newline_flag)
        *bufp++ = NL;

    /* First cleanup any old selection and become the owner. */
    clip_free_selection(&clip_star);
    clip_own_selection(&clip_star);

    /* Yank the text into the '*' register. */
    clip_yank_selection(MCHAR, buffer, (long)(bufp - buffer), &clip_star);

    /* Make the register contents available to the outside world. */
    clip_gen_set_selection(&clip_star);

#ifdef FEAT_X11
    if (both)
    {
        /* Do the same for the '+' register. */
        clip_free_selection(&clip_plus);
        clip_own_selection(&clip_plus);
        clip_yank_selection(MCHAR, buffer, (long)(bufp - buffer), &clip_plus);
        clip_gen_set_selection(&clip_plus);
    }
#endif
    vim_free(buffer);
}

/*
 * Find the starting and ending positions of the word at the given row and
 * column.  Only white-separated words are recognized here.
 */
#define CHAR_CLASS(c)   (c <= ' ' ? ' ' : vim_iswordc(c))

    static void
clip_get_word_boundaries(cb, row, col)
    VimClipboard        *cb;
    int                 row;
    int                 col;
{
    int         start_class;
    int         temp_col;
    char_u      *p;
#ifdef FEAT_MBYTE
    int         mboff;
#endif

    if (row >= screen_Rows || col >= screen_Columns || ScreenLines == NULL)
        return;

    p = ScreenLines + LineOffset[row];
#ifdef FEAT_MBYTE
    /* Correct for starting in the right halve of a double-wide char */
    if (enc_dbcs != 0)
        col -= dbcs_screen_head_off(p, p + col);
    else if (enc_utf8 && p[col] == 0)
        --col;
#endif
    start_class = CHAR_CLASS(p[col]);

    temp_col = col;
    for ( ; temp_col > 0; temp_col--)
#ifdef FEAT_MBYTE
        if (enc_dbcs != 0
                   && (mboff = dbcs_screen_head_off(p, p + temp_col - 1)) > 0)
            temp_col -= mboff;
        else
#endif
        if (CHAR_CLASS(p[temp_col - 1]) != start_class
#ifdef FEAT_MBYTE
                && !(enc_utf8 && p[temp_col - 1] == 0)
#endif
                )
            break;
    cb->word_start_col = temp_col;

    temp_col = col;
    for ( ; temp_col < screen_Columns; temp_col++)
#ifdef FEAT_MBYTE
        if (enc_dbcs != 0 && dbcs_ptr2cells(p + temp_col) == 2)
            ++temp_col;
        else
#endif
        if (CHAR_CLASS(p[temp_col]) != start_class
#ifdef FEAT_MBYTE
                && !(enc_utf8 && p[temp_col] == 0)
#endif
                )
            break;
    cb->word_end_col = temp_col;
}

/*
 * Find the column position for the last non-whitespace character on the given
 * line.
 */
    static int
clip_get_line_end(row)
    int         row;
{
    int     i;

    if (row >= screen_Rows || ScreenLines == NULL)
        return 0;
    for (i = screen_Columns; i > 0; i--)
        if (ScreenLines[LineOffset[row] + i - 1] != ' ')
            break;
    return i;
}

/*
 * Update the currently selected region by adding and/or subtracting from the
 * beginning or end and inverting the changed area(s).
 */
    static void
clip_update_modeless_selection(cb, row1, col1, row2, col2)
    VimClipboard    *cb;
    int             row1;
    int             col1;
    int             row2;
    int             col2;
{
    /* See if we changed at the beginning of the selection */
    if (row1 != cb->start.lnum || col1 != (int)cb->start.col)
    {
        clip_invert_area(row1, col1, (int)cb->start.lnum, cb->start.col,
                                                                 CLIP_TOGGLE);
        cb->start.lnum = row1;
        cb->start.col  = col1;
    }

    /* See if we changed at the end of the selection */
    if (row2 != cb->end.lnum || col2 != (int)cb->end.col)
    {
        clip_invert_area((int)cb->end.lnum, cb->end.col, row2, col2,
                                                                 CLIP_TOGGLE);
        cb->end.lnum = row2;
        cb->end.col  = col2;
    }
}

    int
clip_gen_own_selection(cbd)
    VimClipboard        *cbd;
{
#ifdef FEAT_XCLIPBOARD
# ifdef FEAT_GUI
    if (gui.in_use)
        return clip_mch_own_selection(cbd);
    else
# endif
        return clip_xterm_own_selection(cbd);
#else
    return clip_mch_own_selection(cbd);
#endif
}

    void
clip_gen_lose_selection(cbd)
    VimClipboard        *cbd;
{
#ifdef FEAT_XCLIPBOARD
# ifdef FEAT_GUI
    if (gui.in_use)
        clip_mch_lose_selection(cbd);
    else
# endif
        clip_xterm_lose_selection(cbd);
#else
    clip_mch_lose_selection(cbd);
#endif
}

    void
clip_gen_set_selection(cbd)
    VimClipboard        *cbd;
{
#ifdef FEAT_XCLIPBOARD
# ifdef FEAT_GUI
    if (gui.in_use)
        clip_mch_set_selection(cbd);
    else
# endif
        clip_xterm_set_selection(cbd);
#else
    clip_mch_set_selection(cbd);
#endif
}

    void
clip_gen_request_selection(cbd)
    VimClipboard        *cbd;
{
#ifdef FEAT_XCLIPBOARD
# ifdef FEAT_GUI
    if (gui.in_use)
        clip_mch_request_selection(cbd);
    else
# endif
        clip_xterm_request_selection(cbd);
#else
    clip_mch_request_selection(cbd);
#endif
}

#endif /* FEAT_CLIPBOARD */

/*****************************************************************************
 * Functions that handle the input buffer.
 * This is used for any GUI version, and the unix terminal version.
 *
 * For Unix, the input characters are buffered to be able to check for a
 * CTRL-C.  This should be done with signals, but I don't know how to do that
 * in a portable way for a tty in RAW mode.
 *
 * For the client-server code in the console the received keys are put in the
 * input buffer.
 */

#if defined(USE_INPUT_BUF) || defined(PROTO)

/*
 * Internal typeahead buffer.  Includes extra space for long key code
 * descriptions which would otherwise overflow.  The buffer is considered full
 * when only this extra space (or part of it) remains.
 */
#if defined(FEAT_SUN_WORKSHOP) || defined(FEAT_NETBEANS_INTG) \
        || defined(FEAT_CLIENTSERVER)
   /*
    * Sun WorkShop and NetBeans stuff debugger commands into the input buffer.
    * This requires a larger buffer...
    * (Madsen) Go with this for remote input as well ...
    */
# define INBUFLEN 4096
#else
# define INBUFLEN 250
#endif

static char_u   inbuf[INBUFLEN + MAX_KEY_CODE_LEN];
static int      inbufcount = 0;     /* number of chars in inbuf[] */

/*
 * vim_is_input_buf_full(), vim_is_input_buf_empty(), add_to_input_buf(), and
 * trash_input_buf() are functions for manipulating the input buffer.  These
 * are used by the gui_* calls when a GUI is used to handle keyboard input.
 */

    int
vim_is_input_buf_full()
{
    return (inbufcount >= INBUFLEN);
}

    int
vim_is_input_buf_empty()
{
    return (inbufcount == 0);
}

#if defined(FEAT_OLE) || defined(PROTO)
    int
vim_free_in_input_buf()
{
    return (INBUFLEN - inbufcount);
}
#endif

#if defined(FEAT_GUI_GTK) || defined(PROTO)
    int
vim_used_in_input_buf()
{
    return inbufcount;
}
#endif

#if defined(FEAT_EVAL) || defined(FEAT_EX_EXTRA) || defined(PROTO)
/*
 * Return the current contents of the input buffer and make it empty.
 * The returned pointer must be passed to set_input_buf() later.
 */
    char_u *
get_input_buf()
{
    garray_T    *gap;

    /* We use a growarray to store the data pointer and the length. */
    gap = (garray_T *)alloc((unsigned)sizeof(garray_T));
    if (gap != NULL)
    {
        /* Add one to avoid a zero size. */
        gap->ga_data = alloc((unsigned)inbufcount + 1);
        if (gap->ga_data != NULL)
            mch_memmove(gap->ga_data, inbuf, (size_t)inbufcount);
        gap->ga_len = inbufcount;
    }
    trash_input_buf();
    return (char_u *)gap;
}

/*
 * Restore the input buffer with a pointer returned from get_input_buf().
 * The allocated memory is freed, this only works once!
 */
    void
set_input_buf(p)
    char_u      *p;
{
    garray_T    *gap = (garray_T *)p;

    if (gap != NULL)
    {
        if (gap->ga_data != NULL)
        {
            mch_memmove(inbuf, gap->ga_data, gap->ga_len);
            inbufcount = gap->ga_len;
            vim_free(gap->ga_data);
        }
        vim_free(gap);
    }
}
#endif

#if defined(FEAT_GUI) \
        || defined(FEAT_MOUSE_GPM) || defined(FEAT_SYSMOUSE) \
        || defined(FEAT_XCLIPBOARD) || defined(VMS) \
        || defined(FEAT_SNIFF) || defined(FEAT_CLIENTSERVER) \
        || defined(PROTO)
/*
 * Add the given bytes to the input buffer
 * Special keys start with CSI.  A real CSI must have been translated to
 * CSI KS_EXTRA KE_CSI.  K_SPECIAL doesn't require translation.
 */
    void
add_to_input_buf(s, len)
    char_u  *s;
    int     len;
{
    if (inbufcount + len > INBUFLEN + MAX_KEY_CODE_LEN)
        return;     /* Shouldn't ever happen! */

#ifdef FEAT_HANGULIN
    if ((State & (INSERT|CMDLINE)) && hangul_input_state_get())
        if ((len = hangul_input_process(s, len)) == 0)
            return;
#endif

    while (len--)
        inbuf[inbufcount++] = *s++;
}
#endif

#if ((defined(FEAT_XIM) || defined(FEAT_DND)) && defined(FEAT_GUI_GTK)) \
        || defined(FEAT_GUI_MSWIN) \
        || defined(FEAT_GUI_MAC) \
        || (defined(FEAT_MBYTE) && defined(FEAT_MBYTE_IME)) \
        || (defined(FEAT_GUI) && (!defined(USE_ON_FLY_SCROLL) \
                || defined(FEAT_MENU))) \
        || defined(PROTO)
/*
 * Add "str[len]" to the input buffer while escaping CSI bytes.
 */
    void
add_to_input_buf_csi(char_u *str, int len)
{
    int         i;
    char_u      buf[2];

    for (i = 0; i < len; ++i)
    {
        add_to_input_buf(str + i, 1);
        if (str[i] == CSI)
        {
            /* Turn CSI into K_CSI. */
            buf[0] = KS_EXTRA;
            buf[1] = (int)KE_CSI;
            add_to_input_buf(buf, 2);
        }
    }
}
#endif

#if defined(FEAT_HANGULIN) || defined(PROTO)
    void
push_raw_key (s, len)
    char_u  *s;
    int     len;
{
    while (len--)
        inbuf[inbufcount++] = *s++;
}
#endif

#if defined(FEAT_GUI) || defined(FEAT_EVAL) || defined(FEAT_EX_EXTRA) \
        || defined(PROTO)
/* Remove everything from the input buffer.  Called when ^C is found */
    void
trash_input_buf()
{
    inbufcount = 0;
}
#endif

/*
 * Read as much data from the input buffer as possible up to maxlen, and store
 * it in buf.
 * Note: this function used to be Read() in unix.c
 */
    int
read_from_input_buf(buf, maxlen)
    char_u  *buf;
    long    maxlen;
{
    if (inbufcount == 0)        /* if the buffer is empty, fill it */
        fill_input_buf(TRUE);
    if (maxlen > inbufcount)
        maxlen = inbufcount;
    mch_memmove(buf, inbuf, (size_t)maxlen);
    inbufcount -= maxlen;
    if (inbufcount)
        mch_memmove(inbuf, inbuf + maxlen, (size_t)inbufcount);
    return (int)maxlen;
}

    void
fill_input_buf(exit_on_error)
    int exit_on_error UNUSED;
{
#if defined(UNIX) || defined(OS2) || defined(VMS) || defined(MACOS_X_UNIX)
    int         len;
    int         try;
    static int  did_read_something = FALSE;
# ifdef FEAT_MBYTE
    static char_u *rest = NULL;     /* unconverted rest of previous read */
    static int  restlen = 0;
    int         unconverted;
# endif
#endif

#ifdef FEAT_GUI
    if (gui.in_use
# ifdef NO_CONSOLE_INPUT
    /* Don't use the GUI input when the window hasn't been opened yet.
     * We get here from ui_inchar() when we should try reading from stdin. */
            && !no_console_input()
# endif
       )
    {
        gui_mch_update();
        return;
    }
#endif
#if defined(UNIX) || defined(OS2) || defined(VMS) || defined(MACOS_X_UNIX)
    if (vim_is_input_buf_full())
        return;
    /*
     * Fill_input_buf() is only called when we really need a character.
     * If we can't get any, but there is some in the buffer, just return.
     * If we can't get any, and there isn't any in the buffer, we give up and
     * exit Vim.
     */
# ifdef __BEOS__
    /*
     * On the BeBox version (for now), all input is secretly performed within
     * beos_select() which is called from RealWaitForChar().
     */
    while (!vim_is_input_buf_full() && RealWaitForChar(read_cmd_fd, 0, NULL))
            ;
    len = inbufcount;
    inbufcount = 0;
# else

#  ifdef FEAT_SNIFF
    if (sniff_request_waiting)
    {
        add_to_input_buf((char_u *)"\233sniff",6); /* results in K_SNIFF */
        sniff_request_waiting = 0;
        want_sniff_request = 0;
        return;
    }
#  endif

# ifdef FEAT_MBYTE
    if (rest != NULL)
    {
        /* Use remainder of previous call, starts with an invalid character
         * that may become valid when reading more. */
        if (restlen > INBUFLEN - inbufcount)
            unconverted = INBUFLEN - inbufcount;
        else
            unconverted = restlen;
        mch_memmove(inbuf + inbufcount, rest, unconverted);
        if (unconverted == restlen)
        {
            vim_free(rest);
            rest = NULL;
        }
        else
        {
            restlen -= unconverted;
            mch_memmove(rest, rest + unconverted, restlen);
        }
        inbufcount += unconverted;
    }
    else
        unconverted = 0;
#endif

    len = 0;    /* to avoid gcc warning */
    for (try = 0; try < 100; ++try)
    {
#  ifdef VMS
        len = vms_read(
#  else
        len = read(read_cmd_fd,
#  endif
            (char *)inbuf + inbufcount, (size_t)((INBUFLEN - inbufcount)
#  ifdef FEAT_MBYTE
                / input_conv.vc_factor
#  endif
                ));
#  if 0
                )       /* avoid syntax highlight error */
#  endif

        if (len > 0 || got_int)
            break;
        /*
         * If reading stdin results in an error, continue reading stderr.
         * This helps when using "foo | xargs vim".
         */
        if (!did_read_something && !isatty(read_cmd_fd) && read_cmd_fd == 0)
        {
            int m = cur_tmode;

            /* We probably set the wrong file descriptor to raw mode.  Switch
             * back to cooked mode, use another descriptor and set the mode to
             * what it was. */
            settmode(TMODE_COOK);
#ifdef HAVE_DUP
            /* Use stderr for stdin, also works for shell commands. */
            close(0);
            ignored = dup(2);
#else
            read_cmd_fd = 2;    /* read from stderr instead of stdin */
#endif
            settmode(m);
        }
        if (!exit_on_error)
            return;
    }
# endif
    if (len <= 0 && !got_int)
        read_error_exit();
    if (len > 0)
        did_read_something = TRUE;
    if (got_int)
    {
        /* Interrupted, pretend a CTRL-C was typed. */
        inbuf[0] = 3;
        inbufcount = 1;
    }
    else
    {
# ifdef FEAT_MBYTE
        /*
         * May perform conversion on the input characters.
         * Include the unconverted rest of the previous call.
         * If there is an incomplete char at the end it is kept for the next
         * time, reading more bytes should make conversion possible.
         * Don't do this in the unlikely event that the input buffer is too
         * small ("rest" still contains more bytes).
         */
        if (input_conv.vc_type != CONV_NONE)
        {
            inbufcount -= unconverted;
            len = convert_input_safe(inbuf + inbufcount,
                                     len + unconverted, INBUFLEN - inbufcount,
                                       rest == NULL ? &rest : NULL, &restlen);
        }
# endif
        while (len-- > 0)
        {
            /*
             * if a CTRL-C was typed, remove it from the buffer and set got_int
             */
            if (inbuf[inbufcount] == 3 && ctrl_c_interrupts)
            {
                /* remove everything typed before the CTRL-C */
                mch_memmove(inbuf, inbuf + inbufcount, (size_t)(len + 1));
                inbufcount = 0;
                got_int = TRUE;
            }
            ++inbufcount;
        }
    }
#endif /* UNIX or OS2 or VMS*/
}
#endif /* defined(UNIX) || defined(FEAT_GUI) || defined(OS2)  || defined(VMS) */

/*
 * Exit because of an input read error.
 */
    void
read_error_exit()
{
    if (silent_mode)    /* Normal way to exit for "ex -s" */
        getout(0);
    STRCPY(IObuff, _("Vim: Error reading input, exiting...\n"));
    preserve_exit();
}

#if defined(CURSOR_SHAPE) || defined(PROTO)
/*
 * May update the shape of the cursor.
 */
    void
ui_cursor_shape()
{
# ifdef FEAT_GUI
    if (gui.in_use)
        gui_update_cursor_later();
    else
# endif
        term_cursor_shape();

# ifdef MCH_CURSOR_SHAPE
    mch_update_cursor();
# endif
}
#endif

#if defined(FEAT_CLIPBOARD) || defined(FEAT_GUI) || defined(FEAT_RIGHTLEFT) \
        || defined(FEAT_MBYTE) || defined(PROTO)
/*
 * Check bounds for column number
 */
    int
check_col(col)
    int     col;
{
    if (col < 0)
        return 0;
    if (col >= (int)screen_Columns)
        return (int)screen_Columns - 1;
    return col;
}

/*
 * Check bounds for row number
 */
    int
check_row(row)
    int     row;
{
    if (row < 0)
        return 0;
    if (row >= (int)screen_Rows)
        return (int)screen_Rows - 1;
    return row;
}
#endif

/*
 * Stuff for the X clipboard.  Shared between VMS and Unix.
 */

#if defined(FEAT_XCLIPBOARD) || defined(FEAT_GUI_X11) || defined(PROTO)
# include <X11/Xatom.h>
# include <X11/Intrinsic.h>

/*
 * Open the application context (if it hasn't been opened yet).
 * Used for Motif and Athena GUI and the xterm clipboard.
 */
    void
open_app_context()
{
    if (app_context == NULL)
    {
        XtToolkitInitialize();
        app_context = XtCreateApplicationContext();
    }
}

static Atom     vim_atom;       /* Vim's own special selection format */
#ifdef FEAT_MBYTE
static Atom     vimenc_atom;    /* Vim's extended selection format */
#endif
static Atom     compound_text_atom;
static Atom     text_atom;
static Atom     targets_atom;

    void
x11_setup_atoms(dpy)
    Display     *dpy;
{
    vim_atom           = XInternAtom(dpy, VIM_ATOM_NAME,   False);
#ifdef FEAT_MBYTE
    vimenc_atom        = XInternAtom(dpy, VIMENC_ATOM_NAME,False);
#endif
    compound_text_atom = XInternAtom(dpy, "COMPOUND_TEXT", False);
    text_atom          = XInternAtom(dpy, "TEXT",          False);
    targets_atom       = XInternAtom(dpy, "TARGETS",       False);
    clip_star.sel_atom = XA_PRIMARY;
    clip_plus.sel_atom = XInternAtom(dpy, "CLIPBOARD",     False);
}

/*
 * X Selection stuff, for cutting and pasting text to other windows.
 */

static void  clip_x11_request_selection_cb __ARGS((Widget, XtPointer, Atom *, Atom *, XtPointer, long_u *, int *));

    static void
clip_x11_request_selection_cb(w, success, sel_atom, type, value, length,
                              format)
    Widget      w UNUSED;
    XtPointer   success;
    Atom        *sel_atom;
    Atom        *type;
    XtPointer   value;
    long_u      *length;
    int         *format;
{
    int         motion_type;
    long_u      len;
    char_u      *p;
    char        **text_list = NULL;
    VimClipboard        *cbd;
#ifdef FEAT_MBYTE
    char_u      *tmpbuf = NULL;
#endif

    if (*sel_atom == clip_plus.sel_atom)
        cbd = &clip_plus;
    else
        cbd = &clip_star;

    if (value == NULL || *length == 0)
    {
        clip_free_selection(cbd);       /* nothing received, clear register */
        *(int *)success = FALSE;
        return;
    }
    motion_type = MCHAR;
    p = (char_u *)value;
    len = *length;
    if (*type == vim_atom)
    {
        motion_type = *p++;
        len--;
    }

#ifdef FEAT_MBYTE
    else if (*type == vimenc_atom)
    {
        char_u          *enc;
        vimconv_T       conv;
        int             convlen;

        motion_type = *p++;
        --len;

        enc = p;
        p += STRLEN(p) + 1;
        len -= p - enc;

        /* If the encoding of the text is different from 'encoding', attempt
         * converting it. */
        conv.vc_type = CONV_NONE;
        convert_setup(&conv, enc, p_enc);
        if (conv.vc_type != CONV_NONE)
        {
            convlen = len;      /* Need to use an int here. */
            tmpbuf = string_convert(&conv, p, &convlen);
            len = convlen;
            if (tmpbuf != NULL)
                p = tmpbuf;
            convert_setup(&conv, NULL, NULL);
        }
    }
#endif

    else if (*type == compound_text_atom || (
#ifdef FEAT_MBYTE
                enc_dbcs != 0 &&
#endif
                *type == text_atom))
    {
        XTextProperty   text_prop;
        int             n_text = 0;
        int             status;

        text_prop.value = (unsigned char *)value;
        text_prop.encoding = *type;
        text_prop.format = *format;
        text_prop.nitems = len;
        status = XmbTextPropertyToTextList(X_DISPLAY, &text_prop,
                                                         &text_list, &n_text);
        if (status != Success || n_text < 1)
        {
            *(int *)success = FALSE;
            return;
        }
        p = (char_u *)text_list[0];
        len = STRLEN(p);
    }
    clip_yank_selection(motion_type, p, (long)len, cbd);

    if (text_list != NULL)
        XFreeStringList(text_list);
#ifdef FEAT_MBYTE
    vim_free(tmpbuf);
#endif
    XtFree((char *)value);
    *(int *)success = TRUE;
}

    void
clip_x11_request_selection(myShell, dpy, cbd)
    Widget      myShell;
    Display     *dpy;
    VimClipboard        *cbd;
{
    XEvent      event;
    Atom        type;
    static int  success;
    int         i;
    time_t      start_time;
    int         timed_out = FALSE;

    for (i =
#ifdef FEAT_MBYTE
            0
#else
            1
#endif
            ; i < 5; i++)
    {
        switch (i)
        {
#ifdef FEAT_MBYTE
            case 0:  type = vimenc_atom;        break;
#endif
            case 1:  type = vim_atom;           break;
            case 2:  type = compound_text_atom; break;
            case 3:  type = text_atom;          break;
            default: type = XA_STRING;
        }
        success = MAYBE;
        XtGetSelectionValue(myShell, cbd->sel_atom, type,
            clip_x11_request_selection_cb, (XtPointer)&success, CurrentTime);

        /* Make sure the request for the selection goes out before waiting for
         * a response. */
        XFlush(dpy);

        /*
         * Wait for result of selection request, otherwise if we type more
         * characters, then they will appear before the one that requested the
         * paste!  Don't worry, we will catch up with any other events later.
         */
        start_time = time(NULL);
        while (success == MAYBE)
        {
            if (XCheckTypedEvent(dpy, SelectionNotify, &event)
                    || XCheckTypedEvent(dpy, SelectionRequest, &event)
                    || XCheckTypedEvent(dpy, PropertyNotify, &event))
            {
                /* This is where clip_x11_request_selection_cb() should be
                 * called.  It may actually happen a bit later, so we loop
                 * until "success" changes.
                 * We may get a SelectionRequest here and if we don't handle
                 * it we hang.  KDE klipper does this, for example.
                 * We need to handle a PropertyNotify for large selections. */
                XtDispatchEvent(&event);
                continue;
            }

            /* Time out after 2 to 3 seconds to avoid that we hang when the
             * other process doesn't respond.  Note that the SelectionNotify
             * event may still come later when the selection owner comes back
             * to life and the text gets inserted unexpectedly.  Don't know
             * why that happens or how to avoid that :-(. */
            if (time(NULL) > start_time + 2)
            {
                timed_out = TRUE;
                break;
            }

            /* Do we need this?  Probably not. */
            XSync(dpy, False);

            /* Wait for 1 msec to avoid that we eat up all CPU time. */
            ui_delay(1L, TRUE);
        }

        if (success == TRUE)
            return;

        /* don't do a retry with another type after timing out, otherwise we
         * hang for 15 seconds. */
        if (timed_out)
            break;
    }

    /* Final fallback position - use the X CUT_BUFFER0 store */
    yank_cut_buffer0(dpy, cbd);
}

static Boolean  clip_x11_convert_selection_cb __ARGS((Widget, Atom *, Atom *, Atom *, XtPointer *, long_u *, int *));

    static Boolean
clip_x11_convert_selection_cb(w, sel_atom, target, type, value, length, format)
    Widget      w UNUSED;
    Atom        *sel_atom;
    Atom        *target;
    Atom        *type;
    XtPointer   *value;
    long_u      *length;
    int         *format;
{
    char_u      *string;
    char_u      *result;
    int         motion_type;
    VimClipboard        *cbd;
    int         i;

    if (*sel_atom == clip_plus.sel_atom)
        cbd = &clip_plus;
    else
        cbd = &clip_star;

    if (!cbd->owned)
        return False;       /* Shouldn't ever happen */

    /* requestor wants to know what target types we support */
    if (*target == targets_atom)
    {
        Atom *array;

        if ((array = (Atom *)XtMalloc((unsigned)(sizeof(Atom) * 6))) == NULL)
            return False;
        *value = (XtPointer)array;
        i = 0;
        array[i++] = XA_STRING;
        array[i++] = targets_atom;
#ifdef FEAT_MBYTE
        array[i++] = vimenc_atom;
#endif
        array[i++] = vim_atom;
        array[i++] = text_atom;
        array[i++] = compound_text_atom;
        *type = XA_ATOM;
        /* This used to be: *format = sizeof(Atom) * 8; but that caused
         * crashes on 64 bit machines. (Peter Derr) */
        *format = 32;
        *length = i;
        return True;
    }

    if (       *target != XA_STRING
#ifdef FEAT_MBYTE
            && *target != vimenc_atom
#endif
            && *target != vim_atom
            && *target != text_atom
            && *target != compound_text_atom)
        return False;

    clip_get_selection(cbd);
    motion_type = clip_convert_selection(&string, length, cbd);
    if (motion_type < 0)
        return False;

    /* For our own format, the first byte contains the motion type */
    if (*target == vim_atom)
        (*length)++;

#ifdef FEAT_MBYTE
    /* Our own format with encoding: motion 'encoding' NUL text */
    if (*target == vimenc_atom)
        *length += STRLEN(p_enc) + 2;
#endif

    *value = XtMalloc((Cardinal)*length);
    result = (char_u *)*value;
    if (result == NULL)
    {
        vim_free(string);
        return False;
    }

    if (*target == XA_STRING)
    {
        mch_memmove(result, string, (size_t)(*length));
        *type = XA_STRING;
    }
    else if (*target == compound_text_atom
            || *target == text_atom)
    {
        XTextProperty   text_prop;
        char            *string_nt = (char *)alloc((unsigned)*length + 1);

        /* create NUL terminated string which XmbTextListToTextProperty wants */
        mch_memmove(string_nt, string, (size_t)*length);
        string_nt[*length] = NUL;
        XmbTextListToTextProperty(X_DISPLAY, (char **)&string_nt, 1,
                                              XCompoundTextStyle, &text_prop);
        vim_free(string_nt);
        XtFree(*value);                 /* replace with COMPOUND text */
        *value = (XtPointer)(text_prop.value);  /*    from plain text */
        *length = text_prop.nitems;
        *type = compound_text_atom;
    }

#ifdef FEAT_MBYTE
    else if (*target == vimenc_atom)
    {
        int l = STRLEN(p_enc);

        result[0] = motion_type;
        STRCPY(result + 1, p_enc);
        mch_memmove(result + l + 2, string, (size_t)(*length - l - 2));
        *type = vimenc_atom;
    }
#endif

    else
    {
        result[0] = motion_type;
        mch_memmove(result + 1, string, (size_t)(*length - 1));
        *type = vim_atom;
    }
    *format = 8;            /* 8 bits per char */
    vim_free(string);
    return True;
}

static void  clip_x11_lose_ownership_cb __ARGS((Widget, Atom *));

    static void
clip_x11_lose_ownership_cb(w, sel_atom)
    Widget  w UNUSED;
    Atom    *sel_atom;
{
    if (*sel_atom == clip_plus.sel_atom)
        clip_lose_selection(&clip_plus);
    else
        clip_lose_selection(&clip_star);
}

    void
clip_x11_lose_selection(myShell, cbd)
    Widget      myShell;
    VimClipboard        *cbd;
{
    XtDisownSelection(myShell, cbd->sel_atom, CurrentTime);
}

    int
clip_x11_own_selection(myShell, cbd)
    Widget      myShell;
    VimClipboard        *cbd;
{
    if (XtOwnSelection(myShell, cbd->sel_atom, CurrentTime,
            clip_x11_convert_selection_cb, clip_x11_lose_ownership_cb,
                                                               NULL) == False)
        return FAIL;
    return OK;
}

/*
 * Send the current selection to the clipboard.  Do nothing for X because we
 * will fill in the selection only when requested by another app.
 */
    void
clip_x11_set_selection(cbd)
    VimClipboard *cbd UNUSED;
{
}
#endif

#if defined(FEAT_XCLIPBOARD) || defined(FEAT_GUI_X11) \
    || defined(FEAT_GUI_GTK) || defined(PROTO)
/*
 * Get the contents of the X CUT_BUFFER0 and put it in "cbd".
 */
    void
yank_cut_buffer0(dpy, cbd)
    Display             *dpy;
    VimClipboard        *cbd;
{
    int         nbytes = 0;
    char_u      *buffer = (char_u *)XFetchBuffer(dpy, &nbytes, 0);

    if (nbytes > 0)
    {
#ifdef FEAT_MBYTE
        int  done = FALSE;

        /* CUT_BUFFER0 is supposed to be always latin1.  Convert to 'enc' when
         * using a multi-byte encoding.  Conversion between two 8-bit
         * character sets usually fails and the text might actually be in
         * 'enc' anyway. */
        if (has_mbyte)
        {
            char_u      *conv_buf;
            vimconv_T   vc;

            vc.vc_type = CONV_NONE;
            if (convert_setup(&vc, (char_u *)"latin1", p_enc) == OK)
            {
                conv_buf = string_convert(&vc, buffer, &nbytes);
                if (conv_buf != NULL)
                {
                    clip_yank_selection(MCHAR, conv_buf, (long)nbytes, cbd);
                    vim_free(conv_buf);
                    done = TRUE;
                }
                convert_setup(&vc, NULL, NULL);
            }
        }
        if (!done)  /* use the text without conversion */
#endif
            clip_yank_selection(MCHAR, buffer, (long)nbytes, cbd);
        XFree((void *)buffer);
        if (p_verbose > 0)
        {
            verbose_enter();
            verb_msg((char_u *)_("Used CUT_BUFFER0 instead of empty selection"));
            verbose_leave();
        }
    }
}
#endif

#if defined(FEAT_MOUSE) || defined(PROTO)

/*
 * Move the cursor to the specified row and column on the screen.
 * Change current window if necessary.  Returns an integer with the
 * CURSOR_MOVED bit set if the cursor has moved or unset otherwise.
 *
 * The MOUSE_FOLD_CLOSE bit is set when clicked on the '-' in a fold column.
 * The MOUSE_FOLD_OPEN bit is set when clicked on the '+' in a fold column.
 *
 * If flags has MOUSE_FOCUS, then the current window will not be changed, and
 * if the mouse is outside the window then the text will scroll, or if the
 * mouse was previously on a status line, then the status line may be dragged.
 *
 * If flags has MOUSE_MAY_VIS, then VIsual mode will be started before the
 * cursor is moved unless the cursor was on a status line.
 * This function returns one of IN_UNKNOWN, IN_BUFFER, IN_STATUS_LINE or
 * IN_SEP_LINE depending on where the cursor was clicked.
 *
 * If flags has MOUSE_MAY_STOP_VIS, then Visual mode will be stopped, unless
 * the mouse is on the status line of the same window.
 *
 * If flags has MOUSE_DID_MOVE, nothing is done if the mouse didn't move since
 * the last call.
 *
 * If flags has MOUSE_SETPOS, nothing is done, only the current position is
 * remembered.
 */
    int
jump_to_mouse(flags, inclusive, which_button)
    int         flags;
    int         *inclusive;     /* used for inclusive operator, can be NULL */
    int         which_button;   /* MOUSE_LEFT, MOUSE_RIGHT, MOUSE_MIDDLE */
{
    static int  on_status_line = 0;     /* #lines below bottom of window */
#ifdef FEAT_VERTSPLIT
    static int  on_sep_line = 0;        /* on separator right of window */
#endif
    static int  prev_row = -1;
    static int  prev_col = -1;
    static win_T *dragwin = NULL;       /* window being dragged */
    static int  did_drag = FALSE;       /* drag was noticed */

    win_T       *wp, *old_curwin;
    pos_T       old_cursor;
    int         count;
    int         first;
    int         row = mouse_row;
    int         col = mouse_col;
#ifdef FEAT_FOLDING
    int         mouse_char;
#endif

    mouse_past_bottom = FALSE;
    mouse_past_eol = FALSE;

    if (flags & MOUSE_RELEASED)
    {
        /* On button release we may change window focus if positioned on a
         * status line and no dragging happened. */
        if (dragwin != NULL && !did_drag)
            flags &= ~(MOUSE_FOCUS | MOUSE_DID_MOVE);
        dragwin = NULL;
        did_drag = FALSE;
    }

    if ((flags & MOUSE_DID_MOVE)
            && prev_row == mouse_row
            && prev_col == mouse_col)
    {
retnomove:
        /* before moving the cursor for a left click which is NOT in a status
         * line, stop Visual mode */
        if (on_status_line)
            return IN_STATUS_LINE;
#ifdef FEAT_VERTSPLIT
        if (on_sep_line)
            return IN_SEP_LINE;
#endif
#ifdef FEAT_VISUAL
        if (flags & MOUSE_MAY_STOP_VIS)
        {
            end_visual_mode();
            redraw_curbuf_later(INVERTED);      /* delete the inversion */
        }
#endif
#if defined(FEAT_CMDWIN) && defined(FEAT_CLIPBOARD)
        /* Continue a modeless selection in another window. */
        if (cmdwin_type != 0 && row < W_WINROW(curwin))
            return IN_OTHER_WIN;
#endif
        return IN_BUFFER;
    }

    prev_row = mouse_row;
    prev_col = mouse_col;

    if (flags & MOUSE_SETPOS)
        goto retnomove;                         /* ugly goto... */

#ifdef FEAT_FOLDING
    /* Remember the character under the mouse, it might be a '-' or '+' in the
     * fold column. */
    if (row >= 0 && row < Rows && col >= 0 && col <= Columns
                                                       && ScreenLines != NULL)
        mouse_char = ScreenLines[LineOffset[row] + col];
    else
        mouse_char = ' ';
#endif

    old_curwin = curwin;
    old_cursor = curwin->w_cursor;

    if (!(flags & MOUSE_FOCUS))
    {
        if (row < 0 || col < 0)                 /* check if it makes sense */
            return IN_UNKNOWN;

#ifdef FEAT_WINDOWS
        /* find the window where the row is in */
        wp = mouse_find_win(&row, &col);
#else
        wp = firstwin;
#endif
        dragwin = NULL;
        /*
         * winpos and height may change in win_enter()!
         */
        if (row >= wp->w_height)                /* In (or below) status line */
        {
            on_status_line = row - wp->w_height + 1;
            dragwin = wp;
        }
        else
            on_status_line = 0;
#ifdef FEAT_VERTSPLIT
        if (col >= wp->w_width)         /* In separator line */
        {
            on_sep_line = col - wp->w_width + 1;
            dragwin = wp;
        }
        else
            on_sep_line = 0;

        /* The rightmost character of the status line might be a vertical
         * separator character if there is no connecting window to the right. */
        if (on_status_line && on_sep_line)
        {
            if (stl_connected(wp))
                on_sep_line = 0;
            else
                on_status_line = 0;
        }
#endif

#ifdef FEAT_VISUAL
        /* Before jumping to another buffer, or moving the cursor for a left
         * click, stop Visual mode. */
        if (VIsual_active
                && (wp->w_buffer != curwin->w_buffer
                    || (!on_status_line
# ifdef FEAT_VERTSPLIT
                        && !on_sep_line
# endif
# ifdef FEAT_FOLDING
                        && (
#  ifdef FEAT_RIGHTLEFT
                            wp->w_p_rl ? col < W_WIDTH(wp) - wp->w_p_fdc :
#  endif
                            col >= wp->w_p_fdc
#  ifdef FEAT_CMDWIN
                                  + (cmdwin_type == 0 && wp == curwin ? 0 : 1)
#  endif
                            )
# endif
                        && (flags & MOUSE_MAY_STOP_VIS))))
        {
            end_visual_mode();
            redraw_curbuf_later(INVERTED);      /* delete the inversion */
        }
#endif
#ifdef FEAT_CMDWIN
        if (cmdwin_type != 0 && wp != curwin)
        {
            /* A click outside the command-line window: Use modeless
             * selection if possible.  Allow dragging the status line of
             * windows just above the command-line window. */
            if (wp->w_winrow + wp->w_height
                       != curwin->w_prev->w_winrow + curwin->w_prev->w_height)
            {
                on_status_line = 0;
                dragwin = NULL;
            }
# ifdef FEAT_VERTSPLIT
            on_sep_line = 0;
# endif
# ifdef FEAT_CLIPBOARD
            if (on_status_line)
                return IN_STATUS_LINE;
            return IN_OTHER_WIN;
# else
            row = 0;
            col += wp->w_wincol;
            wp = curwin;
# endif
        }
#endif
#ifdef FEAT_WINDOWS
        /* Only change window focus when not clicking on or dragging the
         * status line.  Do change focus when releasing the mouse button
         * (MOUSE_FOCUS was set above if we dragged first). */
        if (dragwin == NULL || (flags & MOUSE_RELEASED))
            win_enter(wp, TRUE);                /* can make wp invalid! */
# ifdef CHECK_DOUBLE_CLICK
        /* set topline, to be able to check for double click ourselves */
        if (curwin != old_curwin)
            set_mouse_topline(curwin);
# endif
#endif
        if (on_status_line)                     /* In (or below) status line */
        {
            /* Don't use start_arrow() if we're in the same window */
            if (curwin == old_curwin)
                return IN_STATUS_LINE;
            else
                return IN_STATUS_LINE | CURSOR_MOVED;
        }
#ifdef FEAT_VERTSPLIT
        if (on_sep_line)                        /* In (or below) status line */
        {
            /* Don't use start_arrow() if we're in the same window */
            if (curwin == old_curwin)
                return IN_SEP_LINE;
            else
                return IN_SEP_LINE | CURSOR_MOVED;
        }
#endif

        curwin->w_cursor.lnum = curwin->w_topline;
#ifdef FEAT_GUI
        /* remember topline, needed for double click */
        gui_prev_topline = curwin->w_topline;
# ifdef FEAT_DIFF
        gui_prev_topfill = curwin->w_topfill;
# endif
#endif
    }
    else if (on_status_line && which_button == MOUSE_LEFT)
    {
#ifdef FEAT_WINDOWS
        if (dragwin != NULL)
        {
            /* Drag the status line */
            count = row - dragwin->w_winrow - dragwin->w_height + 1
                                                             - on_status_line;
            win_drag_status_line(dragwin, count);
            did_drag |= count;
        }
#endif
        return IN_STATUS_LINE;                  /* Cursor didn't move */
    }
#ifdef FEAT_VERTSPLIT
    else if (on_sep_line && which_button == MOUSE_LEFT)
    {
        if (dragwin != NULL)
        {
            /* Drag the separator column */
            count = col - dragwin->w_wincol - dragwin->w_width + 1
                                                                - on_sep_line;
            win_drag_vsep_line(dragwin, count);
            did_drag |= count;
        }
        return IN_SEP_LINE;                     /* Cursor didn't move */
    }
#endif
    else /* keep_window_focus must be TRUE */
    {
#ifdef FEAT_VISUAL
        /* before moving the cursor for a left click, stop Visual mode */
        if (flags & MOUSE_MAY_STOP_VIS)
        {
            end_visual_mode();
            redraw_curbuf_later(INVERTED);      /* delete the inversion */
        }
#endif

#if defined(FEAT_CMDWIN) && defined(FEAT_CLIPBOARD)
        /* Continue a modeless selection in another window. */
        if (cmdwin_type != 0 && row < W_WINROW(curwin))
            return IN_OTHER_WIN;
#endif

        row -= W_WINROW(curwin);
#ifdef FEAT_VERTSPLIT
        col -= W_WINCOL(curwin);
#endif

        /*
         * When clicking beyond the end of the window, scroll the screen.
         * Scroll by however many rows outside the window we are.
         */
        if (row < 0)
        {
            count = 0;
            for (first = TRUE; curwin->w_topline > 1; )
            {
#ifdef FEAT_DIFF
                if (curwin->w_topfill < diff_check(curwin, curwin->w_topline))
                    ++count;
                else
#endif
                    count += plines(curwin->w_topline - 1);
                if (!first && count > -row)
                    break;
                first = FALSE;
#ifdef FEAT_FOLDING
                hasFolding(curwin->w_topline, &curwin->w_topline, NULL);
#endif
#ifdef FEAT_DIFF
                if (curwin->w_topfill < diff_check(curwin, curwin->w_topline))
                    ++curwin->w_topfill;
                else
#endif
                {
                    --curwin->w_topline;
#ifdef FEAT_DIFF
                    curwin->w_topfill = 0;
#endif
                }
            }
#ifdef FEAT_DIFF
            check_topfill(curwin, FALSE);
#endif
            curwin->w_valid &=
                      ~(VALID_WROW|VALID_CROW|VALID_BOTLINE|VALID_BOTLINE_AP);
            redraw_later(VALID);
            row = 0;
        }
        else if (row >= curwin->w_height)
        {
            count = 0;
            for (first = TRUE; curwin->w_topline < curbuf->b_ml.ml_line_count; )
            {
#ifdef FEAT_DIFF
                if (curwin->w_topfill > 0)
                    ++count;
                else
#endif
                    count += plines(curwin->w_topline);
                if (!first && count > row - curwin->w_height + 1)
                    break;
                first = FALSE;
#ifdef FEAT_FOLDING
                if (hasFolding(curwin->w_topline, NULL, &curwin->w_topline)
                        && curwin->w_topline == curbuf->b_ml.ml_line_count)
                    break;
#endif
#ifdef FEAT_DIFF
                if (curwin->w_topfill > 0)
                    --curwin->w_topfill;
                else
#endif
                {
                    ++curwin->w_topline;
#ifdef FEAT_DIFF
                    curwin->w_topfill =
                                   diff_check_fill(curwin, curwin->w_topline);
#endif
                }
            }
#ifdef FEAT_DIFF
            check_topfill(curwin, FALSE);
#endif
            redraw_later(VALID);
            curwin->w_valid &=
                      ~(VALID_WROW|VALID_CROW|VALID_BOTLINE|VALID_BOTLINE_AP);
            row = curwin->w_height - 1;
        }
        else if (row == 0)
        {
            /* When dragging the mouse, while the text has been scrolled up as
             * far as it goes, moving the mouse in the top line should scroll
             * the text down (done later when recomputing w_topline). */
            if (mouse_dragging > 0
                    && curwin->w_cursor.lnum
                                       == curwin->w_buffer->b_ml.ml_line_count
                    && curwin->w_cursor.lnum == curwin->w_topline)
                curwin->w_valid &= ~(VALID_TOPLINE);
        }
    }

#ifdef FEAT_FOLDING
    /* Check for position outside of the fold column. */
    if (
# ifdef FEAT_RIGHTLEFT
            curwin->w_p_rl ? col < W_WIDTH(curwin) - curwin->w_p_fdc :
# endif
            col >= curwin->w_p_fdc
#  ifdef FEAT_CMDWIN
                                + (cmdwin_type == 0 ? 0 : 1)
#  endif
       )
        mouse_char = ' ';
#endif

    /* compute the position in the buffer line from the posn on the screen */
    if (mouse_comp_pos(curwin, &row, &col, &curwin->w_cursor.lnum))
        mouse_past_bottom = TRUE;

#ifdef FEAT_VISUAL
    /* Start Visual mode before coladvance(), for when 'sel' != "old" */
    if ((flags & MOUSE_MAY_VIS) && !VIsual_active)
    {
        check_visual_highlight();
        VIsual = old_cursor;
        VIsual_active = TRUE;
        VIsual_reselect = TRUE;
        /* if 'selectmode' contains "mouse", start Select mode */
        may_start_select('o');
        setmouse();
        if (p_smd && msg_silent == 0)
            redraw_cmdline = TRUE;      /* show visual mode later */
    }
#endif

    curwin->w_curswant = col;
    curwin->w_set_curswant = FALSE;     /* May still have been TRUE */
    if (coladvance(col) == FAIL)        /* Mouse click beyond end of line */
    {
        if (inclusive != NULL)
            *inclusive = TRUE;
        mouse_past_eol = TRUE;
    }
    else if (inclusive != NULL)
        *inclusive = FALSE;

    count = IN_BUFFER;
    if (curwin != old_curwin || curwin->w_cursor.lnum != old_cursor.lnum
            || curwin->w_cursor.col != old_cursor.col)
        count |= CURSOR_MOVED;          /* Cursor has moved */

#ifdef FEAT_FOLDING
    if (mouse_char == '+')
        count |= MOUSE_FOLD_OPEN;
    else if (mouse_char != ' ')
        count |= MOUSE_FOLD_CLOSE;
#endif

    return count;
}

/*
 * Compute the position in the buffer line from the posn on the screen in
 * window "win".
 * Returns TRUE if the position is below the last line.
 */
    int
mouse_comp_pos(win, rowp, colp, lnump)
    win_T       *win;
    int         *rowp;
    int         *colp;
    linenr_T    *lnump;
{
    int         col = *colp;
    int         row = *rowp;
    linenr_T    lnum;
    int         retval = FALSE;
    int         off;
    int         count;

#ifdef FEAT_RIGHTLEFT
    if (win->w_p_rl)
        col = W_WIDTH(win) - 1 - col;
#endif

    lnum = win->w_topline;

    while (row > 0)
    {
#ifdef FEAT_DIFF
        /* Don't include filler lines in "count" */
        if (win->w_p_diff
# ifdef FEAT_FOLDING
                && !hasFoldingWin(win, lnum, NULL, NULL, TRUE, NULL)
# endif
                )
        {
            if (lnum == win->w_topline)
                row -= win->w_topfill;
            else
                row -= diff_check_fill(win, lnum);
            count = plines_win_nofill(win, lnum, TRUE);
        }
        else
#endif
            count = plines_win(win, lnum, TRUE);
        if (count > row)
            break;      /* Position is in this buffer line. */
#ifdef FEAT_FOLDING
        (void)hasFoldingWin(win, lnum, NULL, &lnum, TRUE, NULL);
#endif
        if (lnum == win->w_buffer->b_ml.ml_line_count)
        {
            retval = TRUE;
            break;              /* past end of file */
        }
        row -= count;
        ++lnum;
    }

    if (!retval)
    {
        /* Compute the column without wrapping. */
        off = win_col_off(win) - win_col_off2(win);
        if (col < off)
            col = off;
        col += row * (W_WIDTH(win) - off);
        /* add skip column (for long wrapping line) */
        col += win->w_skipcol;
    }

    if (!win->w_p_wrap)
        col += win->w_leftcol;

    /* skip line number and fold column in front of the line */
    col -= win_col_off(win);
    if (col < 0)
    {
#ifdef FEAT_NETBEANS_INTG
        if (usingNetbeans)
            netbeans_gutter_click(lnum);
#endif
        col = 0;
    }

    *colp = col;
    *rowp = row;
    *lnump = lnum;
    return retval;
}

#if defined(FEAT_WINDOWS) || defined(PROTO)
/*
 * Find the window at screen position "*rowp" and "*colp".  The positions are
 * updated to become relative to the top-left of the window.
 */
    win_T *
mouse_find_win(rowp, colp)
    int         *rowp;
    int         *colp UNUSED;
{
    frame_T     *fp;

    fp = topframe;
    *rowp -= firstwin->w_winrow;
    for (;;)
    {
        if (fp->fr_layout == FR_LEAF)
            break;
#ifdef FEAT_VERTSPLIT
        if (fp->fr_layout == FR_ROW)
        {
            for (fp = fp->fr_child; fp->fr_next != NULL; fp = fp->fr_next)
            {
                if (*colp < fp->fr_width)
                    break;
                *colp -= fp->fr_width;
            }
        }
#endif
        else    /* fr_layout == FR_COL */
        {
            for (fp = fp->fr_child; fp->fr_next != NULL; fp = fp->fr_next)
            {
                if (*rowp < fp->fr_height)
                    break;
                *rowp -= fp->fr_height;
            }
        }
    }
    return fp->fr_win;
}
#endif

#if defined(FEAT_GUI_MOTIF) || defined(FEAT_GUI_GTK) || defined (FEAT_GUI_MAC) \
        || defined(FEAT_GUI_ATHENA) || defined(FEAT_GUI_MSWIN) \
        || defined(FEAT_GUI_PHOTON) || defined(PROTO) \
        || defined(FEAT_GUI_MACVIM)
/*
 * Translate window coordinates to buffer position without any side effects
 */
    int
get_fpos_of_mouse(mpos)
    pos_T       *mpos;
{
    win_T       *wp;
    int         row = mouse_row;
    int         col = mouse_col;

    if (row < 0 || col < 0)             /* check if it makes sense */
        return IN_UNKNOWN;

#ifdef FEAT_WINDOWS
    /* find the window where the row is in */
    wp = mouse_find_win(&row, &col);
#else
    wp = firstwin;
#endif
    /*
     * winpos and height may change in win_enter()!
     */
    if (row >= wp->w_height)    /* In (or below) status line */
        return IN_STATUS_LINE;
#ifdef FEAT_VERTSPLIT
    if (col >= wp->w_width)     /* In vertical separator line */
        return IN_SEP_LINE;
#endif

    if (wp != curwin)
        return IN_UNKNOWN;

    /* compute the position in the buffer line from the posn on the screen */
    if (mouse_comp_pos(curwin, &row, &col, &mpos->lnum))
        return IN_STATUS_LINE; /* past bottom */

    mpos->col = vcol2col(wp, mpos->lnum, col);

    if (mpos->col > 0)
        --mpos->col;
    return IN_BUFFER;
}

/*
 * Convert a virtual (screen) column to a character column.
 * The first column is one.
 */
    int
vcol2col(wp, lnum, vcol)
    win_T       *wp;
    linenr_T    lnum;
    int         vcol;
{
    /* try to advance to the specified column */
    int         count = 0;
    char_u      *ptr;
    char_u      *start;

    start = ptr = ml_get_buf(wp->w_buffer, lnum, FALSE);
    while (count <= vcol && *ptr != NUL)
    {
        count += win_lbr_chartabsize(wp, ptr, count, NULL);
        mb_ptr_adv(ptr);
    }
    return (int)(ptr - start);
}
#endif

#endif /* FEAT_MOUSE */

#if defined(FEAT_GUI) || defined(WIN3264) || defined(PROTO)
/*
 * Called when focus changed.  Used for the GUI or for systems where this can
 * be done in the console (Win32).
 */
    void
ui_focus_change(in_focus)
    int         in_focus;       /* TRUE if focus gained. */
{
    static time_t       last_time = (time_t)0;
    int                 need_redraw = FALSE;

    /* When activated: Check if any file was modified outside of Vim.
     * Only do this when not done within the last two seconds (could get
     * several events in a row). */
    if (in_focus && last_time + 2 < time(NULL))
    {
        need_redraw = check_timestamps(
# ifdef FEAT_GUI
                gui.in_use
# else
                FALSE
# endif
                );
        last_time = time(NULL);
    }

#ifdef FEAT_AUTOCMD
    /*
     * Fire the focus gained/lost autocommand.
     */
    need_redraw |= apply_autocmds(in_focus ? EVENT_FOCUSGAINED
                                : EVENT_FOCUSLOST, NULL, NULL, FALSE, curbuf);
#endif

    if (need_redraw)
    {
        /* Something was executed, make sure the cursor is put back where it
         * belongs. */
        need_wait_return = FALSE;

        if (State & CMDLINE)
            redrawcmdline();
        else if (State == HITRETURN || State == SETWSIZE || State == ASKMORE
                || State == EXTERNCMD || State == CONFIRM || exmode_active)
            repeat_message();
        else if ((State & NORMAL) || (State & INSERT))
        {
            if (must_redraw != 0)
                update_screen(0);
            setcursor();
        }
        cursor_on();        /* redrawing may have switched it off */
        out_flush();
# ifdef FEAT_GUI
        if (gui.in_use)
        {
            gui_update_cursor(FALSE, TRUE);
            gui_update_scrollbars(FALSE);
        }
# endif
    }
#ifdef FEAT_TITLE
    /* File may have been changed from 'readonly' to 'noreadonly' */
    if (need_maketitle)
        maketitle();
#endif
}
#endif

#if defined(USE_IM_CONTROL) || defined(PROTO)
/*
 * Save current Input Method status to specified place.
 */
    void
im_save_status(psave)
    long *psave;
{
    /* Don't save when 'imdisable' is set or "xic" is NULL, IM is always
     * disabled then (but might start later).
     * Also don't save when inside a mapping, vgetc_im_active has not been set
     * then.
     * And don't save when the keys were stuffed (e.g., for a "." command).
     * And don't save when the GUI is running but our window doesn't have
     * input focus (e.g., when a find dialog is open). */
    if (!p_imdisable && KeyTyped && !KeyStuffed
# if defined(FEAT_XIM) && !defined(FEAT_GUI_MACVIM)
            && xic != NULL
# endif
# ifdef FEAT_GUI
            && (!gui.in_use || gui.in_focus)
# endif
        )
    {
        /* Do save when IM is on, or IM is off and saved status is on. */
        if (vgetc_im_active)
            *psave = B_IMODE_IM;
        else if (*psave == B_IMODE_IM)
            *psave = B_IMODE_NONE;
    }
}
#endif