1 /* @(#)wwinschar.c 8.1 (Berkeley) 6/6/93 */ 2 /* $NetBSD: wwinschar.c,v 1.7 2003/08/07 11:17:40 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 wwinschar(struct ww *w, int row, int col, char c, char m) 42 { 43 int i; 44 int nvis; 45 short x = c | m << WWC_MSHIFT; 46 47 /* 48 * First, shift the line. 49 */ 50 { 51 union ww_char *p, *q; 52 53 p = &w->ww_buf[row][w->ww_b.r]; 54 q = p - 1; 55 for (i = w->ww_b.r - col; --i > 0;) 56 *--p = *--q; 57 q->c_w = x; 58 } 59 60 /* 61 * If can't see it, just return. 62 */ 63 if (row < w->ww_i.t || row >= w->ww_i.b 64 || w->ww_i.r <= 0 || w->ww_i.r <= col) 65 return; 66 67 if (col < w->ww_i.l) 68 col = w->ww_i.l; 69 70 /* 71 * Now find out how much is actually changed, and fix wwns. 72 */ 73 { 74 union ww_char *buf; 75 char *win; 76 union ww_char *ns; 77 unsigned char *smap; 78 char touched; 79 80 nvis = 0; 81 smap = &wwsmap[row][col]; 82 for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++) 83 ; 84 if (i >= w->ww_i.r) 85 return; 86 col = i; 87 buf = w->ww_buf[row]; 88 win = w->ww_win[row]; 89 ns = wwns[row]; 90 smap = &wwsmap[row][i]; 91 touched = wwtouched[row]; 92 for (; i < w->ww_i.r; i++) { 93 if (*smap++ != w->ww_index) 94 continue; 95 touched |= WWU_TOUCHED; 96 if (win[i]) 97 ns[i].c_w = 98 buf[i].c_w ^ win[i] << WWC_MSHIFT; 99 else { 100 nvis++; 101 ns[i] = buf[i]; 102 } 103 } 104 wwtouched[row] = touched; 105 } 106 107 /* 108 * Can/Should we use delete character? 109 */ 110 if ((tt.tt_inschar || tt.tt_insspace) && nvis > (wwncol - col) / 2) { 111 union ww_char *p, *q; 112 113 if (tt.tt_inschar) 114 xxinschar(row, col, c, m); 115 else { 116 xxinsspace(row, col); 117 x = ' '; 118 } 119 p = &wwos[row][wwncol]; 120 q = p - 1; 121 for (i = wwncol - col; --i > 0;) 122 *--p = *--q; 123 q->c_w = x; 124 } 125 } 126