1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Edward Wang at The University of California, Berkeley. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF 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 * @(#)wwdelchar.c 8.1 (Berkeley) 6/6/93 37 * $FreeBSD: src/usr.bin/window/wwdelchar.c,v 1.1.1.1.14.1 2001/05/17 09:45:01 obrien Exp $ 38 * $DragonFly: src/usr.bin/window/wwdelchar.c,v 1.2 2003/06/17 04:29:34 dillon Exp $ 39 */ 40 41 #include "ww.h" 42 #include "tt.h" 43 44 wwdelchar(w, row, col) 45 register struct ww *w; 46 { 47 register i; 48 int nvis; 49 50 /* 51 * First, shift the line. 52 */ 53 { 54 register union ww_char *p, *q; 55 56 p = &w->ww_buf[row][col]; 57 q = p + 1; 58 for (i = w->ww_b.r - col; --i > 0;) 59 *p++ = *q++; 60 p->c_w = ' '; 61 } 62 63 /* 64 * If can't see it, just return. 65 */ 66 if (row < w->ww_i.t || row >= w->ww_i.b 67 || w->ww_i.r <= 0 || w->ww_i.r <= col) 68 return; 69 70 if (col < w->ww_i.l) 71 col = w->ww_i.l; 72 73 /* 74 * Now find out how much is actually changed, and fix wwns. 75 */ 76 { 77 register union ww_char *buf; 78 register char *win; 79 register union ww_char *ns; 80 register char *smap; 81 char touched; 82 83 nvis = 0; 84 smap = &wwsmap[row][col]; 85 for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++) 86 ; 87 if (i >= w->ww_i.r) 88 return; 89 col = i; 90 buf = w->ww_buf[row]; 91 win = w->ww_win[row]; 92 ns = wwns[row]; 93 smap = &wwsmap[row][i]; 94 touched = wwtouched[row]; 95 for (; i < w->ww_i.r; i++) { 96 if (*smap++ != w->ww_index) 97 continue; 98 touched |= WWU_TOUCHED; 99 if (win[i]) 100 ns[i].c_w = 101 buf[i].c_w ^ win[i] << WWC_MSHIFT; 102 else { 103 nvis++; 104 ns[i] = buf[i]; 105 } 106 } 107 wwtouched[row] = touched; 108 } 109 110 /* 111 * Can/Should we use delete character? 112 */ 113 if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) { 114 register union ww_char *p, *q; 115 116 xxdelchar(row, col); 117 p = &wwos[row][col]; 118 q = p + 1; 119 for (i = wwncol - col; --i > 0;) 120 *p++ = *q++; 121 p->c_w = ' '; 122 } 123 } 124