xref: /src/lib/libcurses/insch.c

/*
 * Copyright (c) 1981 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
/*static char sccsid[] = "from: @(#)insch.c	5.5 (Berkeley) 8/23/92";*/
static char rcsid[] = "$Id: insch.c,v 1.4 1993/08/07 05:48:56 mycroft Exp $";
#endif	/* not lint */

#include <curses.h>

/*
 * winsch --
 *	Do an insert-char on the line, leaving (_cury,_curx) unchanged.
 */
int
winsch(win, ch)
	register WINDOW *win;
	int ch;
{

	register char *end, *temp1, *temp2;

	end = &win->_y[win->_cury][win->_curx];
	temp1 = &win->_y[win->_cury][win->_maxx - 1];
	temp2 = temp1 - 1;
	while (temp1 > end)
		*temp1-- = *temp2--;
	*temp1 = ch;
	touchline(win, win->_cury, win->_curx, win->_maxx - 1);
	if (win->_cury == LINES - 1 && win->_y[LINES - 1][COLS - 1] != ' ')
		if (win->_scroll) {
			wrefresh(win);
			scroll(win);
			win->_cury--;
		} else
			return (ERR);
	return (OK);
}