| | 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 | } |
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