xref: /original-bsd/lib/libcurses/insch.c (revision 2622b709)
1 /*
2  * Copyright (c) 1981 Regents of the University of California.
3  * All rights reserved.
4  *
5  * %sccs.include.redist.c%
6  */
7 
8 #ifndef lint
9 static char sccsid[] = "@(#)insch.c	5.4 (Berkeley) 06/01/90";
10 #endif /* not lint */
11 
12 # include	"curses.ext"
13 
14 /*
15  *	This routine performs an insert-char on the line, leaving
16  * (_cury,_curx) unchanged.
17  *
18  */
19 winsch(win, c)
20 reg WINDOW	*win;
21 char		c; {
22 
23 	reg char	*temp1, *temp2;
24 	reg char	*end;
25 
26 	end = &win->_y[win->_cury][win->_curx];
27 	temp1 = &win->_y[win->_cury][win->_maxx - 1];
28 	temp2 = temp1 - 1;
29 	while (temp1 > end)
30 		*temp1-- = *temp2--;
31 	*temp1 = c;
32 	touchline(win, win->_cury, win->_curx, win->_maxx - 1);
33 	if (win->_cury == LINES - 1 && win->_y[LINES-1][COLS-1] != ' ')
34 		if (win->_scroll) {
35 			wrefresh(win);
36 			scroll(win);
37 			win->_cury--;
38 		}
39 		else
40 			return ERR;
41 	return OK;
42 }
43