Commit | Line | Data |
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2c872e05 | 1 | /* @(#)wwscroll.c 8.1 (Berkeley) 6/6/93 */ |
abecab39 SW |
2 | /* $NetBSD: wwscroll.c,v 1.7 2003/08/07 11:17:44 agc Exp $ */ |
3 | ||
984263bc MD |
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. | |
abecab39 | 19 | * 3. Neither the name of the University nor the names of its contributors |
984263bc MD |
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 | ||
abecab39 SW |
36 | #include <stdlib.h> |
37 | ||
984263bc MD |
38 | #include "ww.h" |
39 | #include "tt.h" | |
abecab39 | 40 | #include "xx.h" |
984263bc | 41 | |
abecab39 SW |
42 | void |
43 | wwscroll(struct ww *w, int n) | |
984263bc | 44 | { |
abecab39 SW |
45 | int dir; |
46 | int top; | |
984263bc MD |
47 | |
48 | if (n == 0) | |
49 | return; | |
50 | dir = n < 0 ? -1 : 1; | |
51 | top = w->ww_b.t - n; | |
52 | if (top > w->ww_w.t) | |
53 | top = w->ww_w.t; | |
54 | else if (top + w->ww_b.nr < w->ww_w.b) | |
55 | top = w->ww_w.b - w->ww_b.nr; | |
56 | n = abs(top - w->ww_b.t); | |
57 | if (n < w->ww_i.nr) { | |
58 | while (--n >= 0) { | |
59 | (void) wwscroll1(w, w->ww_i.t, w->ww_i.b, dir, 0); | |
60 | w->ww_buf += dir; | |
61 | w->ww_b.t -= dir; | |
62 | w->ww_b.b -= dir; | |
63 | } | |
64 | } else { | |
65 | w->ww_buf -= top - w->ww_b.t; | |
66 | w->ww_b.t = top; | |
67 | w->ww_b.b = top + w->ww_b.nr; | |
68 | wwredrawwin(w); | |
69 | } | |
70 | } | |
71 | ||
72 | /* | |
73 | * Scroll one line, between 'row1' and 'row2', in direction 'dir'. | |
74 | * Don't adjust ww_scroll. | |
75 | * And don't redraw 'leaveit' lines. | |
76 | */ | |
abecab39 SW |
77 | int |
78 | wwscroll1(struct ww *w, int row1, int row2, int dir, int leaveit) | |
984263bc | 79 | { |
abecab39 | 80 | int i; |
984263bc MD |
81 | int row1x, row2x; |
82 | int nvis; | |
83 | int nvismax; | |
84 | int scrolled = 0; | |
85 | ||
86 | /* | |
87 | * See how many lines on the screen are affected. | |
88 | * And calculate row1x, row2x, and left at the same time. | |
89 | */ | |
90 | for (i = row1; i < row2 && w->ww_nvis[i] == 0; i++) | |
91 | ; | |
92 | if (i >= row2) /* can't do any fancy stuff */ | |
93 | goto out; | |
94 | row1x = i; | |
95 | for (i = row2 - 1; i >= row1 && w->ww_nvis[i] == 0; i--) | |
96 | ; | |
97 | if (i <= row1x) | |
98 | goto out; /* just one line is easy */ | |
99 | row2x = i + 1; | |
100 | ||
101 | /* | |
102 | * See how much of this window is visible. | |
103 | */ | |
104 | nvismax = wwncol * (row2x - row1x); | |
105 | nvis = 0; | |
106 | for (i = row1x; i < row2x; i++) | |
107 | nvis += w->ww_nvis[i]; | |
108 | ||
109 | /* | |
110 | * If it's a good idea to scroll and the terminal can, then do it. | |
111 | */ | |
112 | if (nvis < nvismax / 2) | |
113 | goto no_scroll; /* not worth it */ | |
114 | if ((dir > 0 ? tt.tt_scroll_down == 0 : tt.tt_scroll_up == 0) || | |
abecab39 SW |
115 | ((tt.tt_scroll_top != row1x || tt.tt_scroll_bot != row2x - 1) && |
116 | tt.tt_setscroll == 0)) | |
984263bc MD |
117 | if (tt.tt_delline == 0 || tt.tt_insline == 0) |
118 | goto no_scroll; | |
119 | xxscroll(dir, row1x, row2x); | |
120 | scrolled = 1; | |
121 | /* | |
122 | * Fix up the old screen. | |
123 | */ | |
124 | { | |
abecab39 SW |
125 | union ww_char *tmp; |
126 | union ww_char **cpp, **cqq; | |
984263bc MD |
127 | |
128 | if (dir > 0) { | |
129 | cpp = &wwos[row1x]; | |
130 | cqq = cpp + 1; | |
131 | tmp = *cpp; | |
132 | for (i = row2x - row1x; --i > 0;) | |
133 | *cpp++ = *cqq++; | |
134 | *cpp = tmp; | |
135 | } else { | |
136 | cpp = &wwos[row2x]; | |
137 | cqq = cpp - 1; | |
138 | tmp = *cqq; | |
139 | for (i = row2x - row1x; --i > 0;) | |
140 | *--cpp = *--cqq; | |
141 | *cqq = tmp; | |
142 | } | |
143 | for (i = wwncol; --i >= 0;) | |
144 | tmp++->c_w = ' '; | |
145 | } | |
146 | ||
147 | no_scroll: | |
148 | /* | |
149 | * Fix the new screen. | |
150 | */ | |
151 | if (nvis == nvismax) { | |
152 | /* | |
153 | * Can shift whole lines. | |
154 | */ | |
155 | if (dir > 0) { | |
156 | { | |
abecab39 SW |
157 | union ww_char *tmp; |
158 | union ww_char **cpp, **cqq; | |
984263bc MD |
159 | |
160 | cpp = &wwns[row1x]; | |
161 | cqq = cpp + 1; | |
162 | tmp = *cpp; | |
163 | for (i = row2x - row1x; --i > 0;) | |
164 | *cpp++ = *cqq++; | |
165 | *cpp = tmp; | |
166 | } | |
167 | if (scrolled) { | |
abecab39 | 168 | char *p, *q; |
984263bc MD |
169 | |
170 | p = &wwtouched[row1x]; | |
171 | q = p + 1; | |
172 | for (i = row2x - row1x; --i > 0;) | |
173 | *p++ = *q++; | |
174 | *p |= WWU_TOUCHED; | |
175 | } else { | |
abecab39 | 176 | char *p; |
984263bc MD |
177 | |
178 | p = &wwtouched[row1x]; | |
179 | for (i = row2x - row1x; --i >= 0;) | |
180 | *p++ |= WWU_TOUCHED; | |
181 | } | |
182 | wwredrawwin1(w, row1, row1x, dir); | |
183 | wwredrawwin1(w, row2x - 1, row2 - leaveit, dir); | |
184 | } else { | |
185 | { | |
abecab39 SW |
186 | union ww_char *tmp; |
187 | union ww_char **cpp, **cqq; | |
984263bc MD |
188 | |
189 | cpp = &wwns[row2x]; | |
190 | cqq = cpp - 1; | |
191 | tmp = *cqq; | |
192 | for (i = row2x - row1x; --i > 0;) | |
193 | *--cpp = *--cqq; | |
194 | *cqq = tmp; | |
195 | } | |
196 | if (scrolled) { | |
abecab39 | 197 | char *p, *q; |
984263bc MD |
198 | |
199 | p = &wwtouched[row2x]; | |
200 | q = p - 1; | |
201 | for (i = row2x - row1x; --i > 0;) | |
202 | *--p = *--q; | |
203 | *q |= WWU_TOUCHED; | |
204 | } else { | |
abecab39 | 205 | char *p; |
984263bc MD |
206 | |
207 | p = &wwtouched[row1x]; | |
208 | for (i = row2x - row1x; --i >= 0;) | |
209 | *p++ |= WWU_TOUCHED; | |
210 | } | |
211 | wwredrawwin1(w, row1 + leaveit, row1x + 1, dir); | |
212 | wwredrawwin1(w, row2x, row2, dir); | |
213 | } | |
214 | } else { | |
215 | if (scrolled) { | |
abecab39 | 216 | char *p; |
984263bc MD |
217 | |
218 | p = &wwtouched[row1x]; | |
219 | for (i = row2x - row1x; --i >= 0;) | |
220 | *p++ |= WWU_TOUCHED; | |
221 | } | |
222 | out: | |
223 | if (dir > 0) | |
224 | wwredrawwin1(w, row1, row2 - leaveit, dir); | |
225 | else | |
226 | wwredrawwin1(w, row1 + leaveit, row2, dir); | |
227 | } | |
228 | return scrolled; | |
229 | } |