1 /* @(#)wwdelchar.c 8.1 (Berkeley) 6/6/93 */ 2 /* $NetBSD: wwdelchar.c,v 1.7 2003/08/07 11:17:38 agc 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 #include "ww.h" 37 #include "tt.h" 38 #include "xx.h" 39 40 void 41 wwdelchar(struct ww *w, int row, int col) 42 { 43 int i; 44 int nvis; 45 46 /* 47 * First, shift the line. 48 */ 49 { 50 union ww_char *p, *q; 51 52 p = &w->ww_buf[row][col]; 53 q = p + 1; 54 for (i = w->ww_b.r - col; --i > 0;) 55 *p++ = *q++; 56 p->c_w = ' '; 57 } 58 59 /* 60 * If can't see it, just return. 61 */ 62 if (row < w->ww_i.t || row >= w->ww_i.b 63 || w->ww_i.r <= 0 || w->ww_i.r <= col) 64 return; 65 66 if (col < w->ww_i.l) 67 col = w->ww_i.l; 68 69 /* 70 * Now find out how much is actually changed, and fix wwns. 71 */ 72 { 73 union ww_char *buf; 74 char *win; 75 union ww_char *ns; 76 unsigned char *smap; 77 char touched; 78 79 nvis = 0; 80 smap = &wwsmap[row][col]; 81 for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++) 82 ; 83 if (i >= w->ww_i.r) 84 return; 85 col = i; 86 buf = w->ww_buf[row]; 87 win = w->ww_win[row]; 88 ns = wwns[row]; 89 smap = &wwsmap[row][i]; 90 touched = wwtouched[row]; 91 for (; i < w->ww_i.r; i++) { 92 if (*smap++ != w->ww_index) 93 continue; 94 touched |= WWU_TOUCHED; 95 if (win[i]) 96 ns[i].c_w = 97 buf[i].c_w ^ win[i] << WWC_MSHIFT; 98 else { 99 nvis++; 100 ns[i] = buf[i]; 101 } 102 } 103 wwtouched[row] = touched; 104 } 105 106 /* 107 * Can/Should we use delete character? 108 */ 109 if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) { 110 union ww_char *p, *q; 111 112 xxdelchar(row, col); 113 p = &wwos[row][col]; 114 q = p + 1; 115 for (i = wwncol - col; --i > 0;) 116 *p++ = *q++; 117 p->c_w = ' '; 118 } 119 } 120