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/* Public Domain Curses */

#include <curspriv.h>

RCSID("$Id: scroll.c,v 1.1 2009/05/10 08:29:53 jld Exp $")

/*man-start**************************************************************

  Name:                                                         scroll

  Synopsis:

        int scroll(WINDOW *win);

        int scrl(int n);

        int wscrl(WINDOW *win, int n);

  Description:

        scroll() causes the window to scroll up one line.  This involves

        moving the lines in the window data strcture.

        With a positive n, scrl() and wscrl() scroll the window up n

        lines (line i + n becomes i); otherwise they scroll the window

        down n lines.

        For these functions to work, scrolling must be enabled via

        scrollok(). Note also that scrolling is not allowed if the

        supplied window is a pad.

  Return Value:

        All functions return OK on success and ERR on error.

  Portability                                X/Open    BSD    SYS V

        scroll                                  Y       Y       Y

        scrl                                    Y       -      4.0

        wscrl                                   Y       -      4.0

**man-end****************************************************************/

int wscrl(WINDOW *win, int n)

{

    int i, l, dir, start, end;

    chtype blank, *temp;

    /* Check if window scrolls. Valid for window AND pad */

    if (!win || !win->_scroll || !n)

        return ERR;

    blank = win->_bkgd;

    if (n > 0)

    {

        start = win->_tmarg;

        end = win->_bmarg;

        dir = 1;

    }

    else

    {

        start = win->_bmarg;

        end = win->_tmarg;

        dir = -1;

    }

    for (l = 0; l < (n * dir); l++)

    {

        temp = win->_y[start];

        /* re-arrange line pointers */

        for (i = start; i != end; i += dir)

            win->_y[i] = win->_y[i + dir];

        win->_y[end] = temp;

        /* make a blank line */

        for (i = 0; i < win->_maxx; i++)

            *temp++ = blank;

    }

    touchline(win, win->_tmarg, win->_bmarg - win->_tmarg + 1);

    PDC_sync(win);

    return OK;

}

int scrl(int n)

{

    PDC_LOG(("scrl() - called\n"));

    return wscrl(stdscr, n);

}

int scroll(WINDOW *win)

{

    PDC_LOG(("scroll() - called\n"));

    return wscrl(win, 1);

}