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      1 /*   $NetBSD: in_wch.c,v 1.9 2024/12/23 02:58:03 blymn Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2005 The NetBSD Foundation Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from code donated to the NetBSD Foundation
      8  * by Ruibiao Qiu <ruibiao (at) arl.wustl.edu,ruibiao (at) gmail.com>.
      9  *
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *	notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *	notice, this list of conditions and the following disclaimer in the
     18  *	documentation and/or other materials provided with the distribution.
     19  * 3. Neither the name of the NetBSD Foundation nor the names of its
     20  *	contributors may be used to endorse or promote products derived
     21  *	from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
     24  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
     25  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     26  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #include <sys/cdefs.h>
     38 #ifndef lint
     39 __RCSID("$NetBSD: in_wch.c,v 1.9 2024/12/23 02:58:03 blymn Exp $");
     40 #endif						  /* not lint */
     41 
     42 #include "curses.h"
     43 #include "curses_private.h"
     44 
     45 /*
     46  * in_wch --
     47  *	Return wide character at cursor position from stdscr.
     48  */
     49 int
     50 in_wch(cchar_t *wcval)
     51 {
     52 	return win_wch(stdscr, wcval);
     53 }
     54 
     55 /*
     56  * mvin_wch --
     57  *  Return wide character at position (y, x) from stdscr.
     58  */
     59 int
     60 mvin_wch(int y, int x, cchar_t *wcval)
     61 {
     62 	return mvwin_wch(stdscr, y, x, wcval);
     63 }
     64 
     65 /*
     66  * mvwin_wch --
     67  *  Return wide character at position (y, x) from the given window.
     68  */
     69 int
     70 mvwin_wch(WINDOW *win, int y, int x, cchar_t *wcval)
     71 {
     72 	if (wmove(win, y, x) == ERR)
     73 		return ERR;
     74 
     75 	return win_wch(win, wcval);
     76 }
     77 
     78 /*
     79  * win_wch --
     80  *	Return wide character at cursor position.
     81  */
     82 int
     83 win_wch(WINDOW *win, cchar_t *wcval)
     84 {
     85 	if (__predict_false(win == NULL))
     86 		return ERR;
     87 
     88 	nschar_t *np;
     89 	__LDATA *lp = &win->alines[win->cury]->line[win->curx];
     90 	int cw = lp->wcols;
     91 
     92 	if (cw < 0)
     93 		lp += cw;
     94 	wcval->vals[0] = lp->ch;
     95 	wcval->attributes = lp->attr;
     96 	wcval->elements = 1;
     97 	np = lp->nsp;
     98 	if (np) {
     99 		do {
    100 			wcval->vals[wcval->elements++] = np->ch;
    101 			np = np-> next;
    102 		} while (np);
    103 	}
    104 
    105 	return OK;
    106 }
    107