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-rw-r--r--usr.bin/window/wwwrite.c298
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diff --git a/usr.bin/window/wwwrite.c b/usr.bin/window/wwwrite.c
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+/*
+ * Copyright (c) 1983, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Edward Wang at The University of California, Berkeley.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)wwwrite.c 8.1 (Berkeley) 6/6/93";
+#endif /* not lint */
+
+#include "ww.h"
+#include "tt.h"
+#include "char.h"
+
+#define UPDATE() \
+ if (!w->ww_noupdate && w->ww_cur.r >= 0 && w->ww_cur.r < wwnrow && \
+ wwtouched[w->ww_cur.r]) \
+ wwupdate1(w->ww_cur.r, w->ww_cur.r + 1)
+
+/*
+ * To support control character expansion, we save the old
+ * p and q values in r and s, and point p at the beginning
+ * of the expanded string, and q at some safe place beyond it
+ * (p + 10). At strategic points in the loops, we check
+ * for (r && !*p) and restore the saved values back into
+ * p and q. Essentially, we implement a stack of depth 2,
+ * to avoid recursion, which might be a better idea.
+ */
+wwwrite(w, p, n)
+register struct ww *w;
+register char *p;
+int n;
+{
+ char hascursor;
+ char *savep = p;
+ char *q = p + n;
+ char *r = 0;
+ char *s;
+
+#ifdef lint
+ s = 0; /* define it before possible use */
+#endif
+ if (hascursor = w->ww_hascursor)
+ wwcursor(w, 0);
+ while (p < q && !w->ww_stopped && (!wwinterrupt() || w->ww_nointr)) {
+ if (r && !*p) {
+ p = r;
+ q = s;
+ r = 0;
+ continue;
+ }
+ if (w->ww_wstate == 0 &&
+ (isprt(*p) || w->ww_unctrl && isunctrl(*p))) {
+ register i;
+ register union ww_char *bp;
+ int col, col1;
+
+ if (w->ww_insert) { /* this is very slow */
+ if (*p == '\t') {
+ p++;
+ w->ww_cur.c += 8 -
+ (w->ww_cur.c - w->ww_w.l & 7);
+ goto chklf;
+ }
+ if (!isprt(*p)) {
+ r = p + 1;
+ s = q;
+ p = unctrl(*p);
+ q = p + 10;
+ }
+ wwinschar(w, w->ww_cur.r, w->ww_cur.c,
+ *p++, w->ww_modes);
+ goto right;
+ }
+
+ bp = &w->ww_buf[w->ww_cur.r][w->ww_cur.c];
+ i = w->ww_cur.c;
+ while (i < w->ww_w.r && p < q)
+ if (!*p && r) {
+ p = r;
+ q = s;
+ r = 0;
+ } else if (*p == '\t') {
+ register tmp = 8 - (i - w->ww_w.l & 7);
+ p++;
+ i += tmp;
+ bp += tmp;
+ } else if (isprt(*p)) {
+ bp++->c_w = *p++
+ | w->ww_modes << WWC_MSHIFT;
+ i++;
+ } else if (w->ww_unctrl && isunctrl(*p)) {
+ r = p + 1;
+ s = q;
+ p = unctrl(*p);
+ q = p + 10;
+ } else
+ break;
+ col = MAX(w->ww_cur.c, w->ww_i.l);
+ col1 = MIN(i, w->ww_i.r);
+ w->ww_cur.c = i;
+ if (w->ww_cur.r >= w->ww_i.t
+ && w->ww_cur.r < w->ww_i.b) {
+ register union ww_char *ns = wwns[w->ww_cur.r];
+ register char *smap = &wwsmap[w->ww_cur.r][col];
+ register char *win = w->ww_win[w->ww_cur.r];
+ int nchanged = 0;
+
+ bp = w->ww_buf[w->ww_cur.r];
+ for (i = col; i < col1; i++)
+ if (*smap++ == w->ww_index) {
+ nchanged++;
+ ns[i].c_w = bp[i].c_w
+ ^ win[i] << WWC_MSHIFT;
+ }
+ if (nchanged > 0)
+ wwtouched[w->ww_cur.r] |= WWU_TOUCHED;
+ }
+ chklf:
+ if (w->ww_cur.c >= w->ww_w.r)
+ goto crlf;
+ } else switch (w->ww_wstate) {
+ case 0:
+ switch (*p++) {
+ case '\n':
+ if (w->ww_mapnl)
+ crlf:
+ w->ww_cur.c = w->ww_w.l;
+ lf:
+ UPDATE();
+ if (++w->ww_cur.r >= w->ww_w.b) {
+ w->ww_cur.r = w->ww_w.b - 1;
+ if (w->ww_w.b < w->ww_b.b) {
+ (void) wwscroll1(w, w->ww_i.t,
+ w->ww_i.b, 1, 0);
+ w->ww_buf++;
+ w->ww_b.t--;
+ w->ww_b.b--;
+ } else
+ wwdelline(w, w->ww_b.t);
+ }
+ break;
+ case '\b':
+ if (--w->ww_cur.c < w->ww_w.l) {
+ w->ww_cur.c = w->ww_w.r - 1;
+ goto up;
+ }
+ break;
+ case '\r':
+ w->ww_cur.c = w->ww_w.l;
+ break;
+ case ctrl('g'):
+ ttputc(ctrl('g'));
+ break;
+ case ctrl('['):
+ w->ww_wstate = 1;
+ break;
+ }
+ break;
+ case 1:
+ w->ww_wstate = 0;
+ switch (*p++) {
+ case '@':
+ w->ww_insert = 1;
+ break;
+ case 'A':
+ up:
+ UPDATE();
+ if (--w->ww_cur.r < w->ww_w.t) {
+ w->ww_cur.r = w->ww_w.t;
+ if (w->ww_w.t > w->ww_b.t) {
+ (void) wwscroll1(w, w->ww_i.t,
+ w->ww_i.b, -1, 0);
+ w->ww_buf--;
+ w->ww_b.t++;
+ w->ww_b.b++;
+ } else
+ wwinsline(w, w->ww_b.t);
+ }
+ break;
+ case 'B':
+ goto lf;
+ case 'C':
+ right:
+ w->ww_cur.c++;
+ goto chklf;
+ case 'E':
+ w->ww_buf -= w->ww_w.t - w->ww_b.t;
+ w->ww_b.t = w->ww_w.t;
+ w->ww_b.b = w->ww_b.t + w->ww_b.nr;
+ w->ww_cur.r = w->ww_w.t;
+ w->ww_cur.c = w->ww_w.l;
+ wwclreos(w, w->ww_w.t, w->ww_w.l);
+ break;
+ case 'H':
+ UPDATE();
+ w->ww_cur.r = w->ww_w.t;
+ w->ww_cur.c = w->ww_w.l;
+ break;
+ case 'J':
+ wwclreos(w, w->ww_cur.r, w->ww_cur.c);
+ break;
+ case 'K':
+ wwclreol(w, w->ww_cur.r, w->ww_cur.c);
+ break;
+ case 'L':
+ UPDATE();
+ wwinsline(w, w->ww_cur.r);
+ break;
+ case 'M':
+ wwdelline(w, w->ww_cur.r);
+ break;
+ case 'N':
+ wwdelchar(w, w->ww_cur.r, w->ww_cur.c);
+ break;
+ case 'O':
+ w->ww_insert = 0;
+ break;
+ case 'P':
+ wwinschar(w, w->ww_cur.r, w->ww_cur.c, ' ', 0);
+ break;
+ case 'X':
+ wwupdate();
+ break;
+ case 'Y':
+ UPDATE();
+ w->ww_wstate = 2;
+ break;
+ case 'Z':
+ wwupdate();
+ xxflush(0);
+ break;
+ case 's':
+ w->ww_wstate = 4;
+ break;
+ case 'r':
+ w->ww_wstate = 5;
+ break;
+ }
+ break;
+ case 2:
+ w->ww_cur.r = w->ww_w.t +
+ (unsigned)(*p++ - ' ') % w->ww_w.nr;
+ w->ww_wstate = 3;
+ break;
+ case 3:
+ w->ww_cur.c = w->ww_w.l +
+ (unsigned)(*p++ - ' ') % w->ww_w.nc;
+ w->ww_wstate = 0;
+ break;
+ case 4:
+ w->ww_modes |= *p++ & wwavailmodes;
+ w->ww_wstate = 0;
+ break;
+ case 5:
+ w->ww_modes &= ~*p++;
+ w->ww_wstate = 0;
+ break;
+ }
+ }
+ if (hascursor)
+ wwcursor(w, 1);
+ wwnwwr++;
+ wwnwwra += n;
+ n = p - savep;
+ wwnwwrc += n;
+ return n;
+}
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