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delch.c revision 1.27 
      1 /*	$NetBSD: delch.c,v 1.27 2022/01/25 03:05:06 blymn Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1981, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)delch.c	8.2 (Berkeley) 5/4/94";
     36 #else
     37 __RCSID("$NetBSD: delch.c,v 1.27 2022/01/25 03:05:06 blymn Exp $");
     38 #endif
     39 #endif				/* not lint */
     40 
     41 #include <string.h>
     42 #include <stdlib.h>
     43 
     44 #include "curses.h"
     45 #include "curses_private.h"
     46 
     47 #ifndef _CURSES_USE_MACROS
     48 /*
     49  * delch --
     50  *	Do a delete-char on the line, leaving (cury, curx) unchanged.
     51  */
     52 int
     53 delch(void)
     54 {
     55 	return wdelch(stdscr);
     56 }
     57 
     58 /*
     59  * mvdelch --
     60  *	Do a delete-char on the line at (y, x) on stdscr.
     61  */
     62 int
     63 mvdelch(int y, int x)
     64 {
     65 	return mvwdelch(stdscr, y, x);
     66 }
     67 
     68 /*
     69  * mvwdelch --
     70  *	Do a delete-char on the line at (y, x) of the given window.
     71  */
     72 int
     73 mvwdelch(WINDOW *win, int y, int x)
     74 {
     75 	if (wmove(win, y, x) == ERR)
     76 		return ERR;
     77 
     78 	return wdelch(win);
     79 }
     80 
     81 #endif
     82 
     83 /*
     84  * wdelch --
     85  *	Do a delete-char on the line, leaving (cury, curx) unchanged.
     86  */
     87 int
     88 wdelch(WINDOW *win)
     89 {
     90 	__LDATA *end, *temp1, *temp2;
     91 
     92 #ifndef HAVE_WCHAR
     93 	end = &win->alines[win->cury]->line[win->maxx - 1];
     94 	temp1 = &win->alines[win->cury]->line[win->curx];
     95 	temp2 = temp1 + 1;
     96 	while (temp1 < end) {
     97 		(void)memcpy(temp1, temp2, sizeof(__LDATA));
     98 		temp1++, temp2++;
     99 	}
    100 	temp1->ch = win->bch;
    101 	if (__using_color && win != curscr)
    102 		temp1->attr = win->battr & __COLOR;
    103 	else
    104 		temp1->attr = 0;
    105 	__touchline(win, (int)win->cury, (int)win->curx, (int)win->maxx - 1);
    106 	return OK;
    107 #else
    108 	int cw, sx;
    109 	nschar_t *np, *tnp;
    110 
    111 	end = &win->alines[win->cury]->line[win->maxx - 1];
    112 	sx = win->curx;
    113 	temp1 = &win->alines[win->cury]->line[win->curx];
    114 	cw = temp1->wcols;
    115 	if (cw < 0) {
    116 		temp1 += cw;
    117 		sx += cw;
    118 		cw = temp1->wcols;
    119 	}
    120 	np = temp1->nsp;
    121 	if (np) {
    122 		while (np) {
    123 			tnp = np->next;
    124 			free(np);
    125 			np = tnp;
    126 		}
    127 		temp1->nsp = NULL;
    128 	}
    129 	if (sx + cw < win->maxx) {
    130 		temp2 = temp1 + cw;
    131 		while (temp1 < end - (cw - 1)) {
    132 			(void)memcpy(temp1, temp2, sizeof(__LDATA));
    133 			temp1++, temp2++;
    134 		}
    135 	}
    136 	while (temp1 <= end) {
    137 		temp1->ch = ( wchar_t )btowc((int) win->bch);
    138 		temp1->attr = 0;
    139 		if (_cursesi_copy_nsp(win->bnsp, temp1) == ERR)
    140 			return ERR;
    141 		temp1->wcols = 1;
    142 		temp1++;
    143 	}
    144 	__touchline(win, (int)win->cury, sx, (int)win->maxx - 1);
    145 	__sync(win);
    146 	return OK;
    147 #endif /* HAVE_WCHAR */
    148 }
    149