1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright (c) 1995-1998, 2000 by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /* LINTLIBRARY */
30
31 /*
32 * wtimeout.c
33 *
34 * XCurses Library
35 *
36 * Copyright 1990, 1994 by Mortice Kern Systems Inc. All rights reserved.
37 *
38 */
39
40 #ifdef M_RCSID
41 #ifndef lint
42 static char rcsID[] = "$Header: /rd/src/libc/xcurses/rcs/wtimeout.c 1.1 "
43 "1995/06/19 16:12:14 ant Exp $";
44 #endif
45 #endif
46
47 #include <private.h>
48
49 /*
50 * Set blocking or non-blocking read for a specified window.
51 * The delay is in milliseconds.
52 */
53 void
wtimeout(WINDOW * w,int delay)54 wtimeout(WINDOW *w, int delay)
55 {
56 if (delay < 0) {
57 /* Blocking mode */
58 w->_vmin = 1;
59 w->_vtime = 0;
60 } else {
61 /* Non-Block (0 == delay) and delayed (0 < delay) */
62 w->_vmin = 0;
63
64 /*
65 * VTIME is in 1/10 of second
66 * w->_vtime value will be set to termios.c_cc[VMIN].
67 * Since c_cc[VMIN] is an unsigned char type, the value
68 * to be set needs to be smaller than or equal to 255.
69 * Also 'delay' is in milliseconds, so it is rounted up
70 * to the nearest 10th of a second. Only when 'delay' is
71 * equal to 0, w->_vtime should become 0; otherwise,
72 * it should become a positive value. The previous version
73 * of this code was using the expression "(delay + 50) /100",
74 * which was incorrect.
75 */
76 w->_vtime = (delay > 25500) ? 255 : (delay + 99) / 100;
77 }
78 }
79