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";
52 xxbufsize = tt.tt_nrow * tt.tt_ncol * 2;
53 /* ccinit may choose to change xxbufsize */
54 if (tt.tt_ntoken > 0 && ccinit() < 0)
56 xxbuf = malloc((unsigned) xxbufsize * sizeof *xxbuf);
62 xxbufe = xxbuf + xxbufsize;
71 xxreset1(); /* might be a restart */
84 register struct xx *xp, *xq;
86 for (xp = xx_head; xp != 0; xp = xq) {
90 xx_tail = xx_head = 0;
96 if (tt.tt_scroll_top != 0 || tt.tt_scroll_bot != tt.tt_nrow - 1)
97 /* tt.tt_setscroll is known to be defined */
98 (*tt.tt_setscroll)(0, tt.tt_nrow - 1);
100 (*tt.tt_setmodes)(0);
101 if (tt.tt_scroll_down)
102 (*tt.tt_scroll_down)(1);
103 (*tt.tt_move)(tt.tt_nrow - 1, 0);
104 if (tt.tt_ntoken > 0)
113 register struct xx *xp;
117 if ((xp = xx_freelist) == 0)
118 /* XXX can't deal with failure */
119 xp = (struct xx *) malloc((unsigned) sizeof *xp);
121 xx_freelist = xp->link;
132 register struct xx *xp;
134 xp->link = xx_freelist;
140 register struct xx *xp = xx_tail;
142 if (xp == 0 || xp->cmd != xc_move) {
150 xxscroll(dir, top, bot)
152 register struct xx *xp = xx_tail;
154 if (xp != 0 && xp->cmd == xc_scroll &&
155 xp->arg1 == top && xp->arg2 == bot &&
156 (xp->arg0 < 0 && dir < 0 || xp->arg0 > 0 && dir > 0)) {
167 xxinschar(row, col, c, m)
169 register struct xx *xp;
172 xp->cmd = xc_inschar;
181 register struct xx *xp = xx_tail;
183 if (xp != 0 && xp->cmd == xc_insspace && xp->arg0 == row &&
184 col >= xp->arg1 && col <= xp->arg1 + xp->arg2) {
189 xp->cmd = xc_insspace;
197 register struct xx *xp = xx_tail;
199 if (xp != 0 && xp->cmd == xc_delchar &&
200 xp->arg0 == row && xp->arg1 == col) {
205 xp->cmd = xc_delchar;
213 register struct xx *xp;
222 register struct xx *xp = xxalloc();
231 register struct xx *xp = xxalloc();
238 xxwrite(row, col, p, n, m)
241 register struct xx *xp;
243 if (xxbufp + n + 1 > xxbufe)
254 *xxbufp++ = char_sep;