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1.6 ! david 1: /* $OpenBSD: wwscroll.c,v 1.5 2003/06/03 02:56:23 millert Exp $ */
1.1 deraadt 2: /* $NetBSD: wwscroll.c,v 1.3 1995/09/28 10:35:53 tls 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.
1.5 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 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: #ifndef lint
37: #if 0
38: static char sccsid[] = "@(#)wwscroll.c 8.1 (Berkeley) 6/6/93";
39: #else
1.6 ! david 40: static char rcsid[] = "$OpenBSD: wwscroll.c,v 1.5 2003/06/03 02:56:23 millert Exp $";
1.1 deraadt 41: #endif
42: #endif /* not lint */
1.6 ! david 43:
! 44: #include <stdlib.h>
1.1 deraadt 45:
46: #include "ww.h"
47: #include "tt.h"
48:
49: wwscroll(w, n)
1.4 mpech 50: struct ww *w;
1.1 deraadt 51: int n;
52: {
1.4 mpech 53: int dir;
54: int top;
1.1 deraadt 55:
56: if (n == 0)
57: return;
58: dir = n < 0 ? -1 : 1;
59: top = w->ww_b.t - n;
60: if (top > w->ww_w.t)
61: top = w->ww_w.t;
62: else if (top + w->ww_b.nr < w->ww_w.b)
63: top = w->ww_w.b - w->ww_b.nr;
64: n = abs(top - w->ww_b.t);
65: if (n < w->ww_i.nr) {
66: while (--n >= 0) {
67: (void) wwscroll1(w, w->ww_i.t, w->ww_i.b, dir, 0);
68: w->ww_buf += dir;
69: w->ww_b.t -= dir;
70: w->ww_b.b -= dir;
71: }
72: } else {
73: w->ww_buf -= top - w->ww_b.t;
74: w->ww_b.t = top;
75: w->ww_b.b = top + w->ww_b.nr;
76: wwredrawwin(w);
77: }
78: }
79:
80: /*
81: * Scroll one line, between 'row1' and 'row2', in direction 'dir'.
82: * Don't adjust ww_scroll.
83: * And don't redraw 'leaveit' lines.
84: */
85: wwscroll1(w, row1, row2, dir, leaveit)
1.4 mpech 86: struct ww *w;
1.1 deraadt 87: int row1, row2, dir;
88: int leaveit;
89: {
1.4 mpech 90: int i;
1.1 deraadt 91: int row1x, row2x;
92: int nvis;
93: int nvismax;
94: int scrolled = 0;
95:
96: /*
97: * See how many lines on the screen are affected.
98: * And calculate row1x, row2x, and left at the same time.
99: */
100: for (i = row1; i < row2 && w->ww_nvis[i] == 0; i++)
101: ;
102: if (i >= row2) /* can't do any fancy stuff */
103: goto out;
104: row1x = i;
105: for (i = row2 - 1; i >= row1 && w->ww_nvis[i] == 0; i--)
106: ;
107: if (i <= row1x)
108: goto out; /* just one line is easy */
109: row2x = i + 1;
110:
111: /*
112: * See how much of this window is visible.
113: */
114: nvismax = wwncol * (row2x - row1x);
115: nvis = 0;
116: for (i = row1x; i < row2x; i++)
117: nvis += w->ww_nvis[i];
118:
119: /*
120: * If it's a good idea to scroll and the terminal can, then do it.
121: */
122: if (nvis < nvismax / 2)
123: goto no_scroll; /* not worth it */
124: if ((dir > 0 ? tt.tt_scroll_down == 0 : tt.tt_scroll_up == 0) ||
125: (tt.tt_scroll_top != row1x || tt.tt_scroll_bot != row2x - 1) &&
126: tt.tt_setscroll == 0)
127: if (tt.tt_delline == 0 || tt.tt_insline == 0)
128: goto no_scroll;
129: xxscroll(dir, row1x, row2x);
130: scrolled = 1;
131: /*
132: * Fix up the old screen.
133: */
134: {
1.4 mpech 135: union ww_char *tmp;
136: union ww_char **cpp, **cqq;
1.1 deraadt 137:
138: if (dir > 0) {
139: cpp = &wwos[row1x];
140: cqq = cpp + 1;
141: tmp = *cpp;
142: for (i = row2x - row1x; --i > 0;)
143: *cpp++ = *cqq++;
144: *cpp = tmp;
145: } else {
146: cpp = &wwos[row2x];
147: cqq = cpp - 1;
148: tmp = *cqq;
149: for (i = row2x - row1x; --i > 0;)
150: *--cpp = *--cqq;
151: *cqq = tmp;
152: }
153: for (i = wwncol; --i >= 0;)
154: tmp++->c_w = ' ';
155: }
156:
157: no_scroll:
158: /*
159: * Fix the new screen.
160: */
161: if (nvis == nvismax) {
162: /*
163: * Can shift whole lines.
164: */
165: if (dir > 0) {
166: {
1.4 mpech 167: union ww_char *tmp;
168: union ww_char **cpp, **cqq;
1.1 deraadt 169:
170: cpp = &wwns[row1x];
171: cqq = cpp + 1;
172: tmp = *cpp;
173: for (i = row2x - row1x; --i > 0;)
174: *cpp++ = *cqq++;
175: *cpp = tmp;
176: }
177: if (scrolled) {
1.4 mpech 178: char *p, *q;
1.1 deraadt 179:
180: p = &wwtouched[row1x];
181: q = p + 1;
182: for (i = row2x - row1x; --i > 0;)
183: *p++ = *q++;
184: *p |= WWU_TOUCHED;
185: } else {
1.4 mpech 186: char *p;
1.1 deraadt 187:
188: p = &wwtouched[row1x];
189: for (i = row2x - row1x; --i >= 0;)
190: *p++ |= WWU_TOUCHED;
191: }
192: wwredrawwin1(w, row1, row1x, dir);
193: wwredrawwin1(w, row2x - 1, row2 - leaveit, dir);
194: } else {
195: {
1.4 mpech 196: union ww_char *tmp;
197: union ww_char **cpp, **cqq;
1.1 deraadt 198:
199: cpp = &wwns[row2x];
200: cqq = cpp - 1;
201: tmp = *cqq;
202: for (i = row2x - row1x; --i > 0;)
203: *--cpp = *--cqq;
204: *cqq = tmp;
205: }
206: if (scrolled) {
1.4 mpech 207: char *p, *q;
1.1 deraadt 208:
209: p = &wwtouched[row2x];
210: q = p - 1;
211: for (i = row2x - row1x; --i > 0;)
212: *--p = *--q;
213: *q |= WWU_TOUCHED;
214: } else {
1.4 mpech 215: char *p;
1.1 deraadt 216:
217: p = &wwtouched[row1x];
218: for (i = row2x - row1x; --i >= 0;)
219: *p++ |= WWU_TOUCHED;
220: }
221: wwredrawwin1(w, row1 + leaveit, row1x + 1, dir);
222: wwredrawwin1(w, row2x, row2, dir);
223: }
224: } else {
225: if (scrolled) {
1.4 mpech 226: char *p;
1.1 deraadt 227:
228: p = &wwtouched[row1x];
229: for (i = row2x - row1x; --i >= 0;)
230: *p++ |= WWU_TOUCHED;
231: }
232: out:
233: if (dir > 0)
234: wwredrawwin1(w, row1, row2 - leaveit, dir);
235: else
236: wwredrawwin1(w, row1 + leaveit, row2, dir);
237: }
238: return scrolled;
239: }