2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Edward Wang at The University of California, Berkeley.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
38 static char sccsid[] = "@(#)xx.c 8.1 (Berkeley) 6/6/93";
49 xxbufsize = tt.tt_nrow * tt.tt_ncol * 2;
50 /* ccinit may choose to change xxbufsize */
51 if (tt.tt_ntoken > 0 && ccinit() < 0)
53 xxbuf = malloc((unsigned) xxbufsize * sizeof *xxbuf);
59 xxbufe = xxbuf + xxbufsize;
68 xxreset1(); /* might be a restart */
81 register struct xx *xp, *xq;
83 for (xp = xx_head; xp != 0; xp = xq) {
87 xx_tail = xx_head = 0;
93 if (tt.tt_scroll_top != 0 || tt.tt_scroll_bot != tt.tt_nrow - 1)
94 /* tt.tt_setscroll is known to be defined */
95 (*tt.tt_setscroll)(0, tt.tt_nrow - 1);
98 if (tt.tt_scroll_down)
99 (*tt.tt_scroll_down)(1);
100 (*tt.tt_move)(tt.tt_nrow - 1, 0);
101 if (tt.tt_ntoken > 0)
110 register struct xx *xp;
114 if ((xp = xx_freelist) == 0)
115 /* XXX can't deal with failure */
116 xp = (struct xx *) malloc((unsigned) sizeof *xp);
118 xx_freelist = xp->link;
129 register struct xx *xp;
131 xp->link = xx_freelist;
137 register struct xx *xp = xx_tail;
139 if (xp == 0 || xp->cmd != xc_move) {
147 xxscroll(dir, top, bot)
149 register struct xx *xp = xx_tail;
151 if (xp != 0 && xp->cmd == xc_scroll &&
152 xp->arg1 == top && xp->arg2 == bot &&
153 (xp->arg0 < 0 && dir < 0 || xp->arg0 > 0 && dir > 0)) {
164 xxinschar(row, col, c, m)
166 register struct xx *xp;
169 xp->cmd = xc_inschar;
178 register struct xx *xp = xx_tail;
180 if (xp != 0 && xp->cmd == xc_insspace && xp->arg0 == row &&
181 col >= xp->arg1 && col <= xp->arg1 + xp->arg2) {
186 xp->cmd = xc_insspace;
194 register struct xx *xp = xx_tail;
196 if (xp != 0 && xp->cmd == xc_delchar &&
197 xp->arg0 == row && xp->arg1 == col) {
202 xp->cmd = xc_delchar;
210 register struct xx *xp;
219 register struct xx *xp = xxalloc();
228 register struct xx *xp = xxalloc();
235 xxwrite(row, col, p, n, m)
238 register struct xx *xp;
240 if (xxbufp + n + 1 > xxbufe)
251 *xxbufp++ = char_sep;