1/*	$NetBSD: underscore.c,v 1.13 2021/09/06 07:03:50 rin Exp $	*/
2
3/*-
4 * Copyright (c) 1999 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Julian Coleman.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__RCSID("$NetBSD: underscore.c,v 1.13 2021/09/06 07:03:50 rin Exp $");
35#endif				/* not lint */
36
37#include "curses.h"
38#include "curses_private.h"
39
40#ifndef _CURSES_USE_MACROS
41
42/*
43 * underscore --
44 *	Enter underscore mode on stdscr.
45 */
46int
47underscore(void)
48{
49
50	return wunderscore(stdscr);
51}
52
53
54/*
55 * underend --
56 *	Exit underscore mode on stdscr.
57 */
58int
59underend(void)
60{
61
62	return wunderend(stdscr);
63}
64
65#endif
66
67/*
68 * wunderscore --
69 *	Enter underscore mode.
70 */
71int
72wunderscore(WINDOW *win)
73{
74
75	/* If can underscore, set the screen underscore bit. */
76	if ((enter_underline_mode != NULL && exit_underline_mode != NULL) ||
77	    underline_char != NULL)
78	{
79		__CTRACE(__CTRACE_ATTR, "wunderscore\n");
80		win->wattr |= __UNDERSCORE;
81	}
82	return 1;
83}
84
85/*
86 * wunderend --
87 *	Exit underscore mode.
88 */
89int
90wunderend(WINDOW *win)
91{
92
93	if (exit_underline_mode != NULL) {
94		__CTRACE(__CTRACE_ATTR, "wunderend\n");
95		win->wattr &= ~__UNDERSCORE;
96	}
97        return 1;
98}
99