Ultrix-3.1/src/libcurses/insch.c

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/**********************************************************************
 *   Copyright (c) Digital Equipment Corporation 1984, 1985, 1986.    *
 *   All Rights Reserved. 					      *
 *   Reference "/usr/src/COPYRIGHT" for applicable restrictions.      *
 **********************************************************************/

/* SCCSID: @(#)insch.c	3.0	4/22/86 */
# include	"curses.ext"

/*
 *	This routine performs an insert-char on the line, leaving
 * (_cury,_curx) unchanged.
 *
 * @(#)insch.c	1.2 (Berkeley) 4/17/81
 */
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;
	win->_lastch[win->_cury] = win->_maxx - 1;
	if (win->_firstch[win->_cury] == _NOCHANGE ||
	    win->_firstch[win->_cury] > win->_curx)
		win->_firstch[win->_cury] = win->_curx;
	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;
}