4.3BSD-Reno/src/lib/libcurses/scroll.c

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/*
 * Copyright (c) 1981 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. Neither the name of the University nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)scroll.c	5.4 (Berkeley) 6/1/90";
#endif /* not lint */

# include	"curses.ext"

/*
 *	This routine scrolls the window up a line.
 *
 */
scroll(win)
register  WINDOW	*win;
{
	register int	oy, ox;

# ifdef DEBUG
	fprintf(outf, "SCROLL(%0.2o)\n", win);
# endif

	if (!win->_scroll)
		return ERR;

	getyx(win, oy, ox);
	wmove(win, 0, 0);
	wdeleteln(win);
	wmove(win, oy, ox);

	if (win == curscr) {
		_putchar('\n');
		if (!NONL)
			win->_curx = 0;
# ifdef DEBUG
		fprintf(outf, "SCROLL: win == curscr\n");
# endif
	}
}