1 /* $OpenBSD: wwdelchar.c,v 1.6 2003/06/03 02:56:23 millert Exp $ */ 2 /* $NetBSD: wwdelchar.c,v 1.4 1996/02/08 21:49:00 mycroft Exp $ */ 3 4 /* 5 * Copyright (c) 1983, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Edward Wang at The University of California, Berkeley. 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 University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)wwdelchar.c 8.1 (Berkeley) 6/6/93"; 39 #else 40 static char rcsid[] = "$OpenBSD: wwdelchar.c,v 1.6 2003/06/03 02:56:23 millert Exp $"; 41 #endif 42 #endif /* not lint */ 43 44 #include "ww.h" 45 #include "tt.h" 46 47 wwdelchar(w, row, col) 48 struct ww *w; 49 { 50 int i; 51 int nvis; 52 53 /* 54 * First, shift the line. 55 */ 56 { 57 union ww_char *p, *q; 58 59 p = &w->ww_buf[row][col]; 60 q = p + 1; 61 for (i = w->ww_b.r - col; --i > 0;) 62 *p++ = *q++; 63 p->c_w = ' '; 64 } 65 66 /* 67 * If can't see it, just return. 68 */ 69 if (row < w->ww_i.t || row >= w->ww_i.b 70 || w->ww_i.r <= 0 || w->ww_i.r <= col) 71 return; 72 73 if (col < w->ww_i.l) 74 col = w->ww_i.l; 75 76 /* 77 * Now find out how much is actually changed, and fix wwns. 78 */ 79 { 80 union ww_char *buf; 81 char *win; 82 union ww_char *ns; 83 unsigned char *smap; 84 char touched; 85 86 nvis = 0; 87 smap = &wwsmap[row][col]; 88 for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++) 89 ; 90 if (i >= w->ww_i.r) 91 return; 92 col = i; 93 buf = w->ww_buf[row]; 94 win = w->ww_win[row]; 95 ns = wwns[row]; 96 smap = &wwsmap[row][i]; 97 touched = wwtouched[row]; 98 for (; i < w->ww_i.r; i++) { 99 if (*smap++ != w->ww_index) 100 continue; 101 touched |= WWU_TOUCHED; 102 if (win[i]) 103 ns[i].c_w = 104 buf[i].c_w ^ win[i] << WWC_MSHIFT; 105 else { 106 nvis++; 107 ns[i] = buf[i]; 108 } 109 } 110 wwtouched[row] = touched; 111 } 112 113 /* 114 * Can/Should we use delete character? 115 */ 116 if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) { 117 union ww_char *p, *q; 118 119 xxdelchar(row, col); 120 p = &wwos[row][col]; 121 q = p + 1; 122 for (i = wwncol - col; --i > 0;) 123 *p++ = *q++; 124 p->c_w = ' '; 125 } 126 } 127