xref: /titanic_44/usr/src/ucblib/libcurses/erase.c (revision a60349c89adffc0902b2353230891d8e7f2b24d9)
1 /*
2  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
3  * Use is subject to license terms.
4  */
5 
6 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
7 /*	  All Rights Reserved  	*/
8 
9 /*
10  * Copyright (c) 1980 Regents of the University of California.
11  * All rights reserved.  The Berkeley software License Agreement
12  * specifies the terms and conditions for redistribution.
13  */
14 
15 #pragma ident	"%Z%%M%	%I%	%E% SMI"
16 
17 /*LINTLIBRARY*/
18 
19 #ifndef lint
20 static char
21 sccsid[] = "@(#)erase.c 1.6 88/02/08 SMI"; /* from UCB 5.1 85/06/07 */
22 #endif	/* not lint */
23 
24 #include	<stddef.h>
25 #include	"curses.ext"
26 
27 /*
28  *	This routine erases everything on the window.
29  */
30 
31 int
32 werase(WINDOW *win)
33 {
34 	int	y;
35 	char	*sp, *end, *start, *maxx;
36 	ptrdiff_t	minx;
37 
38 #ifdef DEBUG
39 	fprintf(outf, "WERASE(%0.2o)\n", win);
40 #endif
41 	for (y = 0; y < win->_maxy; y++) {
42 		minx = _NOCHANGE;
43 		start = win->_y[y];
44 		end = &start[win->_maxx];
45 		for (sp = start; sp < end; sp++)
46 			if (*sp != ' ') {
47 				maxx = sp;
48 				if (minx == _NOCHANGE)
49 					minx = sp - start;
50 				*sp = ' ';
51 			}
52 		if (minx != _NOCHANGE)
53 			(void) touchline(win, y, (int)minx,
54 				(int)(maxx - win->_y[y]));
55 	}
56 	win->_curx = win->_cury = 0;
57 	return (OK);
58 }
59