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60de5df9 | 1 | /* |
ad787160 C |
2 | * Copyright (c) 1983, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
46e9ea25 | 4 | * |
3dd3a9e5 KB |
5 | * This code is derived from software contributed to Berkeley by |
6 | * Edward Wang at The University of California, Berkeley. | |
7 | * | |
ad787160 C |
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. | |
60de5df9 EW |
35 | */ |
36 | ||
46e9ea25 | 37 | #ifndef lint |
ad787160 | 38 | static char sccsid[] = "@(#)wwdelchar.c 8.1 (Berkeley) 6/6/93"; |
46e9ea25 KB |
39 | #endif /* not lint */ |
40 | ||
53069d72 | 41 | #include "ww.h" |
e908bfac | 42 | #include "tt.h" |
53069d72 | 43 | |
f2a77fe1 | 44 | wwdelchar(w, row, col) |
53069d72 EW |
45 | register struct ww *w; |
46 | { | |
14f251df | 47 | register i; |
14f251df EW |
48 | int nvis; |
49 | ||
19f9784c EW |
50 | /* |
51 | * First, shift the line. | |
52 | */ | |
14f251df EW |
53 | { |
54 | register union ww_char *p, *q; | |
55 | ||
f2a77fe1 | 56 | p = &w->ww_buf[row][col]; |
14f251df | 57 | q = p + 1; |
f2a77fe1 | 58 | for (i = w->ww_b.r - col; --i > 0;) |
14f251df EW |
59 | *p++ = *q++; |
60 | p->c_w = ' '; | |
61 | } | |
19f9784c EW |
62 | |
63 | /* | |
64 | * If can't see it, just return. | |
65 | */ | |
f2a77fe1 EW |
66 | if (row < w->ww_i.t || row >= w->ww_i.b |
67 | || w->ww_i.r <= 0 || w->ww_i.r <= col) | |
14f251df | 68 | return; |
19f9784c | 69 | |
f2a77fe1 EW |
70 | if (col < w->ww_i.l) |
71 | col = w->ww_i.l; | |
19f9784c EW |
72 | |
73 | /* | |
74 | * Now find out how much is actually changed, and fix wwns. | |
75 | */ | |
14f251df EW |
76 | { |
77 | register union ww_char *buf; | |
78 | register char *win; | |
79 | register union ww_char *ns; | |
80 | register char *smap; | |
d069a508 | 81 | char touched; |
14f251df EW |
82 | |
83 | nvis = 0; | |
f2a77fe1 | 84 | smap = &wwsmap[row][col]; |
d069a508 EW |
85 | for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++) |
86 | ; | |
87 | if (i >= w->ww_i.r) | |
14f251df | 88 | return; |
d069a508 EW |
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; | |
04d70db4 | 98 | touched |= WWU_TOUCHED; |
d069a508 EW |
99 | if (win[i]) |
100 | ns[i].c_w = | |
101 | buf[i].c_w ^ win[i] << WWC_MSHIFT; | |
102 | else { | |
14f251df | 103 | nvis++; |
d069a508 | 104 | ns[i] = buf[i]; |
14f251df | 105 | } |
d069a508 EW |
106 | } |
107 | wwtouched[row] = touched; | |
14f251df | 108 | } |
19f9784c EW |
109 | |
110 | /* | |
111 | * Can/Should we use delete character? | |
112 | */ | |
f2a77fe1 | 113 | if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) { |
14f251df EW |
114 | register union ww_char *p, *q; |
115 | ||
2d152f42 | 116 | xxdelchar(row, col); |
f2a77fe1 | 117 | p = &wwos[row][col]; |
14f251df | 118 | q = p + 1; |
f2a77fe1 | 119 | for (i = wwncol - col; --i > 0;) |
14f251df EW |
120 | *p++ = *q++; |
121 | p->c_w = ' '; | |
122 | } | |
53069d72 | 123 | } |