usr/src/usr.lib/libcurses/insch.c

/*
 * Copyright (c) 1981 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)insch.c     5.3 (Berkeley) 6/30/88";
#endif /* not lint */

# include       "curses.ext"

/*
 *      This routine performs an insert-char on the line, leaving
 * (_cury,_curx) unchanged.
 *
 */
winsch(win, c)
reg WINDOW      *win;
char            c; {

        reg char        *temp1, *temp2;
        reg char        *end;

        end = &win->_y[win->_cury][win->_curx];
        temp1 = &win->_y[win->_cury][win->_maxx - 1];
        temp2 = temp1 - 1;
        while (temp1 > end)
                *temp1-- = *temp2--;
        *temp1 = c;
        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;
}