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      1 /*	$NetBSD: underscore.c,v 1.14 2024/12/23 02:58:04 blymn 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 1.14 2024/12/23 02:58:04 blymn 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  */
     46 int
     47 underscore(void)
     48 {
     49 
     50 	return wunderscore(stdscr);
     51 }
     52 
     53 
     54 /*
     55  * underend --
     56  *	Exit underscore mode on stdscr.
     57  */
     58 int
     59 underend(void)
     60 {
     61 
     62 	return wunderend(stdscr);
     63 }
     64 
     65 #endif
     66 
     67 /*
     68  * wunderscore --
     69  *	Enter underscore mode.
     70  */
     71 int
     72 wunderscore(WINDOW *win)
     73 {
     74 	if (__predict_false(win == NULL))
     75 		return ERR;
     76 
     77 	/* If can underscore, set the screen underscore bit. */
     78 	if ((enter_underline_mode != NULL && exit_underline_mode != NULL) ||
     79 	    underline_char != NULL)
     80 	{
     81 		__CTRACE(__CTRACE_ATTR, "wunderscore\n");
     82 		win->wattr |= __UNDERSCORE;
     83 	}
     84 	return 1;
     85 }
     86 
     87 /*
     88  * wunderend --
     89  *	Exit underscore mode.
     90  */
     91 int
     92 wunderend(WINDOW *win)
     93 {
     94 
     95 	if (__predict_false(win == NULL))
     96 		return ERR;
     97 
     98 	if (exit_underline_mode != NULL) {
     99 		__CTRACE(__CTRACE_ATTR, "wunderend\n");
    100 		win->wattr &= ~__UNDERSCORE;
    101 	}
    102         return 1;
    103 }
    104