1 /* $NetBSD: delch.c,v 1.31 2024/12/23 02:58:03 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 1.31 2024/12/23 02:58:03 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 if (__predict_false(win == NULL)) 93 return ERR; 94 95 #ifndef HAVE_WCHAR 96 end = &win->alines[win->cury]->line[win->maxx - 1]; 97 temp1 = &win->alines[win->cury]->line[win->curx]; 98 temp2 = temp1 + 1; 99 while (temp1 < end) { 100 (void)memcpy(temp1, temp2, sizeof(__LDATA)); 101 temp1++, temp2++; 102 } 103 temp1->ch = win->bch; 104 temp1->cflags = CA_BACKGROUND; 105 if (__using_color && win != curscr) 106 temp1->attr = win->battr & __COLOR; 107 else 108 temp1->attr = 0; 109 __touchline(win, (int)win->cury, (int)win->curx, (int)win->maxx - 1); 110 return OK; 111 #else 112 int cw, sx; 113 nschar_t *np, *tnp; 114 115 end = &win->alines[win->cury]->line[win->maxx - 1]; 116 sx = win->curx; 117 temp1 = &win->alines[win->cury]->line[win->curx]; 118 cw = temp1->wcols; 119 if (cw < 0) { 120 temp1 += cw; 121 sx += cw; 122 cw = temp1->wcols; 123 } 124 np = temp1->nsp; 125 if (np) { 126 while (np) { 127 tnp = np->next; 128 free(np); 129 np = tnp; 130 } 131 temp1->nsp = NULL; 132 } 133 if (sx + cw < win->maxx) { 134 temp2 = temp1 + cw; 135 while (temp1 < end - (cw - 1)) { 136 (void)memcpy(temp1, temp2, sizeof(__LDATA)); 137 temp1++, temp2++; 138 } 139 } 140 while (temp1 <= end) { 141 temp1->ch = win->bch; 142 temp1->cflags |= CA_BACKGROUND; 143 temp1->cflags &= ~CA_CONTINUATION; 144 temp1->attr = win->battr; 145 if (_cursesi_copy_nsp(win->bnsp, temp1) == ERR) 146 return ERR; 147 temp1->wcols = 1; 148 temp1++; 149 } 150 __touchline(win, (int)win->cury, sx, (int)win->maxx - 1); 151 __sync(win); 152 return OK; 153 #endif /* HAVE_WCHAR */ 154 } 155