/* Program Name            : FILERWIN.C                                 */
/*   Original Author       : C. K. Hung 				*/
/*   Date                  : 1-MAY-1991					*/
/*   Program Description   :                                            */
/*                         :                                            */
/* Revision History follows                                             */
 
#include "global.h"
#include "dx.h"
#include "filer.h"
#include "filerkpd.h"
#include "filerque.h"
#include "filerwin.h"
#include "findfile.h"
#include "inquire.h"
#include <signal.h>
 
 
/*
**
**  INTERNAL FUNCTION PROTOTYPING
**
**/
 
    static struct fil_dx_tag *find_current_file(unsigned short int);
 
 

/*
**++
**  FUNCTIONAL DESCRIPTION:
**
**	tbs
**
**--
**/
int	filer_split_win()
{
    int total_rows,
	dir_info_pbd_row,
	prev_win;
    struct fil_dx_tag *p, *q;
    struct filespec_list_tag *r;
    unsigned short int windows;
    char errmsg[255];
    int i;
    int rows_in_page,
	current_page;
    char row_str[81];
    $DESCRIPTOR(row_str_descrip, row_str);
    char page_str[81];
    $DESCRIPTOR(page_str_descrip, page_str);
    int row_beg_y;
    int (*cstat)();
 
    windows = cntrl_info_block.windows;
    if (windows >= MAXWINDOWS)
    {
	signal_err("Maximum number of windows exceeded", bell);
	return DX__ERROR;
    }
    else if (cntrl_info_block.pasteboard_rows <
	    CMDS_RSV_LNS+(windows+1)*(DIRINFO_RSV_LNS+4))
    {
	sprintf(errmsg, "Terminal page length too small for %d windows", windows+1);
        signal_err(errmsg, bell);
	return DX__ERROR;
    }
 
    for (i = cntrl_info_block.windows;  i >= 0;  i--)
    {
	if (i >= cntrl_info_block.cur_win+1)
	{
	    cntrl_info_block.dir_dx[i] = cntrl_info_block.dir_dx[i-1];
	}
    }
 
    /*
    **  Shrink the existing displays by reducing ROWS and BEG_Y fields
    **	in DIR_INFO_DISPLAY and FILER_DISPLAY, then do re-pasting.
    **/
 
    total_rows = 0;
    for (i = 0; i <= cntrl_info_block.windows;  i++)
    {
	cntrl_info_block.dir_dx[i].dir_info_display.rows =
	    (cntrl_info_block.pasteboard_rows - CMDS_RSV_LNS - total_rows) /
		(windows + 1 - i);
	cntrl_info_block.dir_dx[i].dir_info_display.beg_y =
	    CMDS_RSV_LNS + total_rows;
	total_rows += cntrl_info_block.dir_dx[i].dir_info_display.rows;
	cntrl_info_block.dir_dx[i].filer_display.view_rows =
	    cntrl_info_block.dir_dx[i].dir_info_display.rows - DIRINFO_RSV_LNS;
	cntrl_info_block.dir_dx[i].filer_display.beg_y =
	    2 + cntrl_info_block.dir_dx[i].dir_info_display.beg_y;
 
	if (i != cntrl_info_block.cur_win+1)
	{
	    /**  Update dir_info_display  **/
	    check_OK(smg$change_virtual_display (
			 &cntrl_info_block.dir_dx[i].dir_info_display.id,
			 &cntrl_info_block.dir_dx[i].dir_info_display.rows,
			 0,
			 0,
			 0,
			 0))
	    check_OK(smg$move_virtual_display (
			 &cntrl_info_block.dir_dx[i].dir_info_display.id,
			 &cntrl_info_block.pasteboard_id,
			 &cntrl_info_block.dir_dx[i].dir_info_display.beg_y,
			 &cntrl_info_block.dir_dx[i].dir_info_display.beg_x,
			 0))
 
	    put_filer_title(i);
	    put_filer_stat(i);
 
	    current_page =
	      1+(cntrl_info_block.dir_dx[i].cur_file->beg_y-1) /
		cntrl_info_block.dir_dx[i].filer_display.view_rows;
	    sprintf(page_str, "Pg %d", current_page);
	    LENGTH(page_str_descrip) = strlen(page_str);
 
	    sprintf(row_str, "Row %d",
			cntrl_info_block.dir_dx[i].cur_file->beg_y);
	    LENGTH(row_str_descrip) = strlen(row_str);
 
	    check_OK(smg$begin_display_update (
			 &cntrl_info_block.dir_dx[i].dir_info_display.id))
	    check_OK(smg$draw_line (
		      &cntrl_info_block.dir_dx[i].dir_info_display.id,
		      &cntrl_info_block.dir_dx[i].dir_info_display.rows,
		      &1,
		      &cntrl_info_block.dir_dx[i].dir_info_display.rows,
		      &cntrl_info_block.dir_dx[i].dir_info_display.width,
		      0,
		      0))
	    check_OK(smg$put_chars (
			&cntrl_info_block.dir_dx[i].dir_info_display.id,
			&page_str_descrip,
			&cntrl_info_block.dir_dx[i].dir_info_display.rows,
			&2,
			0,
			&SMG$M_BOLD,
			0,
			0))
	    row_beg_y = LENGTH(page_str_descrip)+4;
	    check_OK(smg$put_chars (
			&cntrl_info_block.dir_dx[i].dir_info_display.id,
			&row_str_descrip,
			&cntrl_info_block.dir_dx[i].dir_info_display.rows,
			&row_beg_y,
			0,
			&SMG$M_BOLD,
			0,
			0))
	    check_OK(smg$end_display_update (
			 &cntrl_info_block.dir_dx[i].dir_info_display.id))
 
	    /**  Update filer_display  **/
	    cntrl_info_block.dir_dx[i].filer_display.rows =
		max (cntrl_info_block.dir_dx[i].non_dir_filelist->backward->beg_y,
		     cntrl_info_block.dir_dx[i].filer_display.view_rows);
	    check_OK(smg$move_virtual_display (
			 &cntrl_info_block.dir_dx[i].filer_display.id,
			 &cntrl_info_block.pasteboard_id,
			 &cntrl_info_block.dir_dx[i].filer_display.beg_y,
			 &cntrl_info_block.dir_dx[i].filer_display.beg_x,
			 0))
	    check_OK(smg$change_virtual_display (
			 &cntrl_info_block.dir_dx[i].filer_display.id,
			 &cntrl_info_block.dir_dx[i].filer_display.rows,
			 0,
			 0,
			 0,
			 0))
	    check_OK(smg$change_viewport (
			 &cntrl_info_block.dir_dx[i].filer_display.id,
			 0,
			 0,
			 &cntrl_info_block.dir_dx[i].filer_display.view_rows,
			 0))
	    change_filer_viewport(i);
	}
    }
 
    highlight_filer_current_file();
    unhighlight_filer_current_file();
 
    /**  Assign the new display attributes  **/
 
    cntrl_info_block.windows++;
    prev_win = cntrl_info_block.cur_win;
    cntrl_info_block.cur_win++;
 
    /*
    **	New window will inherite most of the attributes from the original
    **	window.  Different attributes are modified follows.
    **/
 
    strcpy(DX_CURRENT_DIRECTORY.search_pattern, "*");
 
    /*
    **	Modify DIR_INFO virtual displays
    **/
 
    check_OK(smg$create_virtual_display (
                 &DX_CURRENT_DIRECTORY.dir_info_display.rows,
                 &cntrl_info_block.pasteboard_width,
                 &DX_CURRENT_DIRECTORY.dir_info_display.id,
                 &SMG$M_TRUNC_ICON,
                 0,
                 0))
    check_OK(smg$paste_virtual_display (
                 &DX_CURRENT_DIRECTORY.dir_info_display.id,
                 &cntrl_info_block.pasteboard_id,
                 &DX_CURRENT_DIRECTORY.dir_info_display.beg_y,
                 &1,
                 0))
 
    put_filer_title(cntrl_info_block.cur_win);
    put_filer_stat(cntrl_info_block.cur_win);
    check_OK(smg$draw_line (
	      &DX_CURRENT_DIRECTORY.dir_info_display.id,
	      &DX_CURRENT_DIRECTORY.dir_info_display.rows,
	      &1,
	      &DX_CURRENT_DIRECTORY.dir_info_display.rows,
	      &DX_CURRENT_DIRECTORY.dir_info_display.width,
	      0,
	      0))
    check_OK(smg$set_cursor_abs (
                 &cntrl_info_block.commands_display.id,
                 &cntrl_info_block.commands_display.rows,
                 &cntrl_info_block.commands_display.width))
 
 
    /*
    **	Output 'working...' message if total processing time
    **	is longer than 3 seconds.  Needs to disable broadcast message
    **	first because of interference.
    **/
 
#ifndef DEBUG
    check_OK(smg$disable_broadcast_trapping (
                 &cntrl_info_block.pasteboard_id))
 
    cstat = signal(SIGALRM, filter_alarm_working);
    alarm(1);
#endif
 
    /*
    **	Copy to new filespec lists -
    **	    NAME_FILESPEC_LIST, EXCLUDE_FILESPEC_LIST
    **/
 
    copy_filespec_list(
	cntrl_info_block.dir_dx[prev_win].cur_filter.name_filespec_list,
	&DX_CURRENT_DIRECTORY.cur_filter.name_filespec_list);
    copy_filespec_list(
	cntrl_info_block.dir_dx[prev_win].cur_filter.exclude_filespec_list,
	&DX_CURRENT_DIRECTORY.cur_filter.exclude_filespec_list);
 
    /*
    **	Copy to new filelists -
    **	    NON_DIR_FILELIST, DIR_FILELIST, EXCLUDE_FILELIST
    **/
 
    copy_filelist(
	cntrl_info_block.dir_dx[prev_win].non_dir_filelist,
	&DX_CURRENT_DIRECTORY.non_dir_filelist,
	DX_CURRENT_DIRECTORY.sortby,
	DX_CURRENT_DIRECTORY.sortorder);
 
    copy_filelist(
	cntrl_info_block.dir_dx[prev_win].dir_filelist,
	&DX_CURRENT_DIRECTORY.dir_filelist,
	DX_CURRENT_DIRECTORY.sortby,
	DX_CURRENT_DIRECTORY.sortorder);
 
    copy_filelist(
	cntrl_info_block.dir_dx[prev_win].exclude_filelist,
	&DX_CURRENT_DIRECTORY.exclude_filelist,
	DX_CURRENT_DIRECTORY.sortby,
	DX_CURRENT_DIRECTORY.sortorder);
 
    /*
    **	Modify FILER virtual displays
    **/
 
    DX_CURRENT_DIRECTORY.filer_display.rows =
	max (DX_CURRENT_DIRECTORY.non_dir_filelist->backward->beg_y,
	     DX_CURRENT_DIRECTORY.filer_display.view_rows);
 
    check_OK(smg$create_virtual_display (
                 &DX_CURRENT_DIRECTORY.filer_display.rows,
                 &DX_CURRENT_DIRECTORY.filer_display.width,
                 &DX_CURRENT_DIRECTORY.filer_display.id,
                 0,
                 0,
                 0))
    check_OK(smg$create_viewport (
		&DX_CURRENT_DIRECTORY.filer_display.id,
		&DX_CURRENT_DIRECTORY.filer_display.view_beg_y,
		&DX_CURRENT_DIRECTORY.filer_display.view_beg_x,
		&DX_CURRENT_DIRECTORY.filer_display.view_rows,
		&DX_CURRENT_DIRECTORY.filer_display.view_width))
 
    /*
    **	Find current file pointer in the new window
    **/
 
    DX_CURRENT_FILE = find_current_file(prev_win);
 
    /*
    **	Write the new window
    **/
 
    write_to_filer(DX_CURRENT_DIRECTORY.dir_filelist);
    write_to_filer(DX_CURRENT_DIRECTORY.non_dir_filelist);
    change_filer_viewport(cntrl_info_block.cur_win);
    highlight_filer_current_file();
 
    check_OK(smg$paste_virtual_display (
		&DX_CURRENT_DIRECTORY.filer_display.id,
		&cntrl_info_block.pasteboard_id,
		&DX_CURRENT_DIRECTORY.filer_display.beg_y,
		&DX_CURRENT_DIRECTORY.filer_display.beg_x,
		0))
 
    /*
    **	Set the signal back to system default
    **/
 
#ifndef DEBUG
    alarm(0);
    signal(SIGALRM, cstat);
    check_OK(smg$erase_chars (
    		 &cntrl_info_block.commands_display.id,
    		 &10,
    		 &2,
    		 &1))
    check_OK(smg$set_broadcast_trapping (
                 &cntrl_info_block.pasteboard_id,
                 broadcast_routine,
                 0))
#endif;
 
    return DX__NORMAL;
}
 
 

/*
**++
**  FUNCTIONAL DESCRIPTION:
**
**	tbs
**
**--
**/
static struct fil_dx_tag *find_current_file(
	unsigned short int prev_win)
{
    struct fil_dx_tag *p, *q;
 
    for (p = cntrl_info_block.dir_dx[prev_win].dir_filelist->forward,
	    q = DX_CURRENT_DIRECTORY.dir_filelist->forward;
	 p != cntrl_info_block.dir_dx[prev_win].non_dir_filelist;
	 p = p->forward, q = q->forward)
    {
        if (p == cntrl_info_block.dir_dx[prev_win].cur_file)
        {
            return q;
        }
	else if (p == cntrl_info_block.dir_dx[prev_win].dir_filelist)
	{
	    p = cntrl_info_block.dir_dx[prev_win].non_dir_filelist;
	    q = DX_CURRENT_DIRECTORY.non_dir_filelist;
	}
    }
 
    return DX__ERROR;
}
 
 

/*
**++
**  FUNCTIONAL DESCRIPTION:
**
**	tbs
**
**--
**/
int	filer_delete_win()
{
    int i, w;
    int num_of_scrolls;
    struct dir_dx_tag prev_dir_dx;
    int total_rows;
 
    if (cntrl_info_block.windows == 1)
    {
        signal_err("There is only one window", bell);
	return DX__ERROR;
    }
 
    prev_dir_dx = DX_CURRENT_DIRECTORY;
 
    for (w = cntrl_info_block.cur_win;  w < cntrl_info_block.windows-1;  w++)
    {
    	cntrl_info_block.dir_dx[w] = cntrl_info_block.dir_dx[w+1];
    }
 
    if (cntrl_info_block.cur_win == cntrl_info_block.windows-1)
    {
    	cntrl_info_block.cur_win--;
    }
    cntrl_info_block.windows--;
 
    total_rows = 0;
    for (w = 0; w < cntrl_info_block.windows; w++)
    {
	int display_rows;
 
	display_rows =
	 (cntrl_info_block.pasteboard_rows-CMDS_RSV_LNS-total_rows)/
	    (cntrl_info_block.windows-w);
	cntrl_info_block.dir_dx[w].dir_info_display.beg_y =
	    CMDS_RSV_LNS + total_rows;
	num_of_scrolls =
	    display_rows - cntrl_info_block.dir_dx[w].dir_info_display.rows;
	cntrl_info_block.dir_dx[w].dir_info_display.rows = display_rows;
	total_rows += cntrl_info_block.dir_dx[w].dir_info_display.rows;
 
	cntrl_info_block.dir_dx[w].filer_display.beg_y =
	    2 + cntrl_info_block.dir_dx[w].dir_info_display.beg_y;
	
	check_OK(smg$begin_pasteboard_update (
		     &cntrl_info_block.pasteboard_id))
	check_OK(smg$move_virtual_display (
		     &cntrl_info_block.dir_dx[w].dir_info_display.id,
		     &cntrl_info_block.pasteboard_id,
		     &cntrl_info_block.dir_dx[w].dir_info_display.beg_y,
		     &cntrl_info_block.dir_dx[w].dir_info_display.beg_x,
		     0))
	check_OK(smg$change_virtual_display (
		     &cntrl_info_block.dir_dx[w].dir_info_display.id,
		     &cntrl_info_block.dir_dx[w].dir_info_display.rows,
		     0,
		     0,
		     0,
		     0))
	check_OK(smg$move_virtual_display (
		     &cntrl_info_block.dir_dx[w].filer_display.id,
		     &cntrl_info_block.pasteboard_id,
		     &cntrl_info_block.dir_dx[w].filer_display.beg_y,
		     &cntrl_info_block.dir_dx[w].filer_display.beg_x,
		     0))
	
	/**  Adjust filer_display size  **/
	if (cntrl_info_block.dir_dx[w].filer_display.rows <
	    cntrl_info_block.dir_dx[w].dir_info_display.rows - 3)
	{
	    cntrl_info_block.dir_dx[w].filer_display.rows =
		cntrl_info_block.dir_dx[w].dir_info_display.rows - 3;
	    check_OK(smg$change_virtual_display (
			 &cntrl_info_block.dir_dx[w].filer_display.id,
			 &cntrl_info_block.dir_dx[w].filer_display.rows,
			 0,
			 0,
			 0,
			 0))
	}
 
	for (i = 0; i < num_of_scrolls; i++)
	{
	    check_OK(smg$insert_line (
			 &cntrl_info_block.dir_dx[w].dir_info_display.id,
			 &3,
			 $DESCR (" "),
			 &SMG$M_DOWN,
			 0,
			 0,
			 0,
			 0))
 
	    /**  Adjust filer_display  **/
	    cntrl_info_block.dir_dx[w].filer_display.view_rows++;
	    if (cntrl_info_block.dir_dx[w].filer_display.view_beg_y > 1 &&
		cntrl_info_block.dir_dx[w].filer_display.view_beg_y +
		    cntrl_info_block.dir_dx[w].filer_display.view_rows - 1 >
		    cntrl_info_block.dir_dx[w].non_dir_filelist->backward->beg_y)
	    {
		cntrl_info_block.dir_dx[w].filer_display.view_beg_y--;
	    }
	    check_OK(smg$change_viewport (
			 &cntrl_info_block.dir_dx[w].filer_display.id,
			 &cntrl_info_block.dir_dx[w].filer_display.view_beg_y,
			 0,
			 &cntrl_info_block.dir_dx[w].filer_display.view_rows,
			 0))
	}
	check_OK(smg$end_pasteboard_update (
		     &cntrl_info_block.pasteboard_id))
 
	/**  Reposition the cursor in the current display  **/
	change_filer_viewport(w);
    }
 
    /*
    **	Free resoueces used by the window deleted
    **/
 
    free_filespec_list(
	&prev_dir_dx.cur_filter.name_filespec_list);
    free_filespec_list(
	&prev_dir_dx.cur_filter.exclude_filespec_list);
 
    free_filelist(
	&prev_dir_dx.non_dir_filelist);
    free_filelist(
	&prev_dir_dx.dir_filelist);
    free_filelist(
	&prev_dir_dx.exclude_filelist);
    check_OK(smg$delete_virtual_display (
		&prev_dir_dx.dir_info_display.id))
    check_OK(smg$delete_virtual_display (
		&prev_dir_dx.filer_display.id))
 
    return DX__NORMAL;
}
 
 

/*
**++
**  FUNCTIONAL DESCRIPTION:
**
**	tbs
**
**--
**/
int	filer_one_win()
{
    int i;
    int num_of_scrolls;
 
    if (cntrl_info_block.windows == 1)
    {
        signal_err("There is only one window", bell);
	return DX__ERROR;
    }
 
    /**  Make the current displays the topmost displays  **/
    check_OK(smg$repaste_virtual_display (
	     	  &DX_CURRENT_DIRECTORY.filer_display.id,
	     	  &cntrl_info_block.pasteboard_id,
	     	  &DX_CURRENT_DIRECTORY.filer_display.beg_y,
	     	  &DX_CURRENT_DIRECTORY.filer_display.beg_x,
	     	  0))
    check_OK(smg$repaste_virtual_display (
	     	  &DX_CURRENT_DIRECTORY.dir_info_display.id,
	     	  &cntrl_info_block.pasteboard_id,
	     	  &DX_CURRENT_DIRECTORY.dir_info_display.beg_y,
	     	  &DX_CURRENT_DIRECTORY.dir_info_display.beg_x,
	     	  &DX_CURRENT_DIRECTORY.filer_display.id))
 
    /**  Scroll upward  **/
    num_of_scrolls = 0;
    for (i = 0;  i < cntrl_info_block.cur_win;  i++)
    {
    	num_of_scrolls += cntrl_info_block.dir_dx[i].dir_info_display.rows;
    }
    for (i = 0; i < num_of_scrolls; i++)
    {
	check_OK(smg$begin_pasteboard_update (
		     &cntrl_info_block.pasteboard_id))
 
	/**  Adjust dir_info_display  **/
	DX_CURRENT_DIRECTORY.dir_info_display.beg_y--;
	check_OK(smg$move_virtual_display (
		     &DX_CURRENT_DIRECTORY.dir_info_display.id,
		     &cntrl_info_block.pasteboard_id,
		     &DX_CURRENT_DIRECTORY.dir_info_display.beg_y,
		     &DX_CURRENT_DIRECTORY.dir_info_display.beg_x,
		     0))
	DX_CURRENT_DIRECTORY.dir_info_display.rows++;
	check_OK(smg$change_virtual_display (
		     &DX_CURRENT_DIRECTORY.dir_info_display.id,
		     &DX_CURRENT_DIRECTORY.dir_info_display.rows,
		     0,
		     0,
		     0,
		     0))
	check_OK(smg$insert_line (
		     &DX_CURRENT_DIRECTORY.dir_info_display.id,
		     &3,
		     $DESCR (" "),
		     &SMG$M_DOWN,
		     0,
		     0,
		     0,
		     0))
 
	/**  Adjust filer_display  **/
	DX_CURRENT_DIRECTORY.filer_display.beg_y--;
	check_OK(smg$move_virtual_display (
		     &DX_CURRENT_DIRECTORY.filer_display.id,
		     &cntrl_info_block.pasteboard_id,
		     &DX_CURRENT_DIRECTORY.filer_display.beg_y,
		     &DX_CURRENT_DIRECTORY.filer_display.beg_x,
		     0))
	if (DX_CURRENT_DIRECTORY.filer_display.view_beg_y > 1)
	{
	    DX_CURRENT_DIRECTORY.filer_display.view_beg_y--;
	}
	DX_CURRENT_DIRECTORY.filer_display.view_rows++;
	if (DX_CURRENT_DIRECTORY.filer_display.rows <
		DX_CURRENT_DIRECTORY.filer_display.view_rows)
	{	/**  Increase the size of filer_display  **/
	    DX_CURRENT_DIRECTORY.filer_display.rows =
		DX_CURRENT_DIRECTORY.filer_display.view_rows;
	    check_OK(smg$change_virtual_display (
		     	   &DX_CURRENT_DIRECTORY.filer_display.id,
		     	   &DX_CURRENT_DIRECTORY.filer_display.rows,
		     	   0,
		     	   0,
		     	   0,
		     	   0))
	}
	check_OK(smg$change_viewport (
		     &DX_CURRENT_DIRECTORY.filer_display.id,
		     &DX_CURRENT_DIRECTORY.filer_display.view_beg_y,
		     0,
		     &DX_CURRENT_DIRECTORY.filer_display.view_rows,
		     0))
	check_OK(smg$end_pasteboard_update (
		     &cntrl_info_block.pasteboard_id))
    }
 
    /**  Scroll downward  **/
    num_of_scrolls = 0;
    for (i = cntrl_info_block.cur_win+1;  i < cntrl_info_block.windows;  i++)
    {
    	num_of_scrolls += cntrl_info_block.dir_dx[i].dir_info_display.rows;
    }
    for (i = 0;  i < num_of_scrolls;  i++)
    {
	check_OK(smg$begin_pasteboard_update (
	      &cntrl_info_block.pasteboard_id))
 
	/**  Adjust dir_info_display  **/
	DX_CURRENT_DIRECTORY.dir_info_display.rows++;
	check_OK(smg$change_virtual_display (
		     &DX_CURRENT_DIRECTORY.dir_info_display.id,
		     &DX_CURRENT_DIRECTORY.dir_info_display.rows,
		     0,
		     0,
		     0,
		     0))
	check_OK(smg$insert_line (
		     &DX_CURRENT_DIRECTORY.dir_info_display.id,
		     &3,
		     $DESCR (" "),
		     &SMG$M_DOWN,
		     0,
		     0,
		     0,
		     0))
 
	/**  Adjust filer_display  **/
	DX_CURRENT_DIRECTORY.filer_display.view_rows++;
	if (DX_CURRENT_DIRECTORY.filer_display.rows <
		DX_CURRENT_DIRECTORY.filer_display.view_rows)
	{	/**  Increase the size of filer_display  **/
	    DX_CURRENT_DIRECTORY.filer_display.rows =
		DX_CURRENT_DIRECTORY.filer_display.view_rows;
	    check_OK(smg$change_virtual_display (
		     	   &DX_CURRENT_DIRECTORY.filer_display.id,
		     	   &DX_CURRENT_DIRECTORY.filer_display.rows,
		     	   0,
		     	   0,
		     	   0,
		     	   0))
	}
	if (DX_CURRENT_DIRECTORY.filer_display.view_beg_y > 1 &&
	    DX_CURRENT_DIRECTORY.filer_display.view_beg_y +
		DX_CURRENT_DIRECTORY.filer_display.view_rows - 1 >
		DX_CURRENT_DIRECTORY.non_dir_filelist->backward->beg_y)
	{
	    DX_CURRENT_DIRECTORY.filer_display.view_beg_y--;
	}
	check_OK(smg$change_viewport (
		     &DX_CURRENT_DIRECTORY.filer_display.id,
		     &DX_CURRENT_DIRECTORY.filer_display.view_beg_y,
		     0,
		     &DX_CURRENT_DIRECTORY.filer_display.view_rows,
		     0))
	check_OK(smg$end_pasteboard_update (
	      &cntrl_info_block.pasteboard_id))
    }
 
    /**	Reposition the cursor in the current display  **/
    change_filer_viewport(cntrl_info_block.cur_win);
 
    /*
    **	Free resoueces used by the other window
    **/
 
    for (i = 0;  i < cntrl_info_block.windows;  i++)
    {
    	if (i != cntrl_info_block.cur_win)
	{
	    free_filespec_list(
		&cntrl_info_block.dir_dx[i].cur_filter.name_filespec_list);
	    free_filespec_list(
		&cntrl_info_block.dir_dx[i].cur_filter.exclude_filespec_list);
 
	    free_filelist(
		&cntrl_info_block.dir_dx[i].non_dir_filelist);
	    free_filelist(
		&cntrl_info_block.dir_dx[i].dir_filelist);
	    free_filelist(
		&cntrl_info_block.dir_dx[i].exclude_filelist);
	    check_OK(smg$delete_virtual_display (
			&cntrl_info_block.dir_dx[i].dir_info_display.id))
	    check_OK(smg$delete_virtual_display (
			&cntrl_info_block.dir_dx[i].filer_display.id))
	}
    }
 
    /**  Make the first display the current display  **/
    cntrl_info_block.dir_dx[0] = DX_CURRENT_DIRECTORY;
    cntrl_info_block.cur_win = 0;
    cntrl_info_block.windows = 1;
 
    return DX__NORMAL;
}
 
 

/*
**++
**  FUNCTIONAL DESCRIPTION:
**
**	tbs
**
**--
**/
int	filer_next_win()
{
    char errmsg[MAXFILESPEC+1];
 
    if (cntrl_info_block.windows == 1)
    {
        signal_err("There is only one window", bell);
	return DX__ERROR;
    }
    unhighlight_filer_current_file();
    cntrl_info_block.cur_win++;
    if (cntrl_info_block.cur_win >= cntrl_info_block.windows)
    {
    	cntrl_info_block.cur_win = 0;
    }
    setddir(DX_CURRENT_DIRECTORY.cur_dir, errmsg);
    highlight_filer_current_file();
}
 
 

/*
**++
**  FUNCTIONAL DESCRIPTION:
**
**	tbs
**
**--
**/
int	filer_prev_win()
{
    char errmsg[MAXFILESPEC+1];
 
    if (cntrl_info_block.windows == 1)
    {
        signal_err("There is only one window", bell);
	return DX__ERROR;
    }
    unhighlight_filer_current_file();
    cntrl_info_block.cur_win--;
    if ((short) cntrl_info_block.cur_win < 0)
    {
    	cntrl_info_block.cur_win = cntrl_info_block.windows-1;
    }
    setddir(DX_CURRENT_DIRECTORY.cur_dir, errmsg);
    highlight_filer_current_file();
}
 
 

/*
**++
**  FUNCTIONAL DESCRIPTION:
**
**      tbs
**
**--
**/
void	filer_exitset()
{
 
    /*
    **	Scroll screen up 1 line
    **/
 
    check_OK(smg$set_physical_cursor (
	        &cntrl_info_block.pasteboard_id,
	        &cntrl_info_block.pasteboard_rows,
	        &1))
 
    fprintf(stderr, "\033E");
 
    /*
    **	Exit without resetting default directory back to the
    **	original directory
    **/
 
    exit(SS$_NORMAL);
}