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 /* LINTLIBRARY */
28
29 /*
30 * wtimeout.c
31 *
32 * XCurses Library
33 *
34 * Copyright 1990, 1994 by Mortice Kern Systems Inc. All rights reserved.
35 *
36 */
37
38 #ifdef M_RCSID
39 #ifndef lint
40 static char rcsID[] = "$Header: /rd/src/libc/xcurses/rcs/wtimeout.c 1.1 "
41 "1995/06/19 16:12:14 ant Exp $";
42 #endif
43 #endif
44
45 #include <private.h>
46
47 /*
48 * Set blocking or non-blocking read for a specified window.
49 * The delay is in milliseconds.
50 */
51 void
wtimeout(WINDOW * w,int delay)52 wtimeout(WINDOW *w, int delay)
53 {
54 if (delay < 0) {
55 /* Blocking mode */
56 w->_vmin = 1;
57 w->_vtime = 0;
58 } else {
59 /* Non-Block (0 == delay) and delayed (0 < delay) */
60 w->_vmin = 0;
61
62 /*
63 * VTIME is in 1/10 of second
64 * w->_vtime value will be set to termios.c_cc[VMIN].
65 * Since c_cc[VMIN] is an unsigned char type, the value
66 * to be set needs to be smaller than or equal to 255.
67 * Also 'delay' is in milliseconds, so it is rounted up
68 * to the nearest 10th of a second. Only when 'delay' is
69 * equal to 0, w->_vtime should become 0; otherwise,
70 * it should become a positive value. The previous version
71 * of this code was using the expression "(delay + 50) /100",
72 * which was incorrect.
73 */
74 w->_vtime = (delay > 25500) ? 255 : (delay + 99) / 100;
75 }
76 }
77